Intro to Human Geography 1992 Fall 2007
Intro to Human Geography 1992 Fall 2007
Midterm #3 Review
Students with last names beginning with A-F should go to MCDB A2B70 (the biology building just across the plaza from the football stadium) during regular class time (3:00-3:50) on Wednesday, December 5th. All other students should go to CHEM 140 as usual.
This review was put together as an extra service to you by your TAs.
Week 11 Chapter 12 Services
key terms
central place, central place theory, market area (hinterland), range, threshold, gravity model, rank-size rule, primate city, primate city rule
-Services are provided in all societies. In MDCs, in what sector are the majority of workers employed?
- key terms: service, settlement, space, place, region, scale, globalization, connections,
local diversity.
- Case study: call centers in India
- Types of services: Consumer (retail/wholesale, education, health, leisure/hospitality),
Business (financial, professional, transportation), Public.
- In which sector has US job growth been largest?
- Services are clustered in settlements; clustered rural settlements vs. dispersed rural
settlements; what forms do clustered rural settlements take?
- What were the benefits of the enclosure movement in Great Britain?
- What shape do geographers use to depict the market area of a good or service and why?
- How do geographers determine the optimal location within a market?
- What are the steps in determining the best location in a nonlinear settlement?
- Who first demonstrated the principal of nesting market areas?
Terms
o Major Early Urban Settlements:
?Ur
?Titris Hoyuk
?Knossos
?Troy
?Mycenae
?Athens
?Rome
?Paris
o Ziggurat
o 5 most populous cities—not in Europe but in Asia (Baghdad, Constantinople, Kyoto, Changan, Hangchan)
o Corporations—Board of directors, factories, support staff
o Four levels of cities:
?World City
?Command and Control Center
?Specialized producer-service center
?Dependent center
o Two types of business services in LDCs
?Off shore financial services
?Back offices and BPO
o Basic and non-basic industries
o Economic base
o Three types of retail services:
?High threshold
?Long/High Range
?Specific to Downtown
o Vertical geography and sky scrapers
o Suburbanization
o Shopping malls and anchors
Concepts
o Differences and similarities between Mesopotamian and Mediterranean
Settlements
o Role of Roman Empire and services
o Medieval Urban Settlements
?Churches
?Walls
?Markets
?Shops
o Medieval Settlements and military services
o Role of modern cities—concentration of business, political power, and consumer and public services.
o Role of new technologies in communication and transportation (telegraphy, telephone, computers, railroad, and automobile).
o What clusters in world cities?
?What specific businesses and professionals?
?Consumer services
?Wealthy people
?Public services
o Transition from manufacturing to providing services in US economy.
o What kinds of specialization in services do we see among US cities?
o What attracts talent to certain places?
o Defining characteristics of Central Business Districts (CBD)
o Pedestrian only shopping—Why? What does it look like?
o Why would certain businesses be located in CBD and others in the suburbs?
o High cost of land in CBDs
?Where is the most expensive land?
?Why is it so expensive (2 reasons)?
o American versus European CBDs—what are the similarities and differences? Week 12 –
Lecture:Urban Patterns
People (How are these people relevant to thinking about cities?): Bill Cronon
Emile Durkheim
Georg Simmel
Louis Wirth
Ernest Burgess
David Ley
Neil Smith
Terms:
Mechanical solidarity
Organic solidarity
Anomie
Psychic overload
Fragmentation
Rent
Edge Cities
Filtering
Vacancy chains
Obsolescence
Investment
Disinvestment
Gentrification
Public-private partnerships
De-valorization
Rent Gap
Economic Models of the city:
Concentric Rings Model
Sector Model
Multiple Nuclei Model
Historical models of the city:
Mercantile City (pre 1840)
Early industrial city (-1880)
Industrial City (-1920)
Suburbanization (-today)
Polycentric metropolis (1970- today)
Other analytical approaches to the city:
Urban Realms model
Deindustrialization and the Spatial Mismatch Hypothesis
Land rent theory
City as ―Hip‖
―Back to the City‖ movement of capital
Questions to think about:
According to Louis Wirth, what characteristics distinguish city life from rural life?
Describe some instances where you see the tension between the desire for space and the desire for access to amenities playing out
How are the problems of inner cities connected to problems of the suburbs?
What is the book referring to when it describes a transition from vertical separation to territorial segregation?
Have suburbanites benefited more than urbanites from housing and transportation subsidies; if so, how and why?
How have transportation technologies facilitated segregation and sprawl in the suburbs?
What have been some of the problems associate with urban renewal and public housing initiatives?
What is meant by the concept of filtering? What does it have to do with obsolescence and vacancy chains?
How have innovations in transportation technologies transformed the spatial arrangements of cities?
Week 14 Chapter 10 Agriculture
Section 1: Where did agriculture originate?
TERMS
Crop
Vegetative agriculture
Seed agriculture
Agricultural regions
Subsistence agriculture
Commercial agriculture
Prime agricultural land
Agribusiness
CONCEPTS
Origins of Agriculture
What is agriculture?
?What is a crop? What are some examples of crops that form the staple of your diet in the United States? What are some staple crops in other regions of the world (South America, Africa, Southeast Asia)
?What was the predominant way in which humans obtained food prior to agriculture? Is this way of life still practiced today? If so, where in the world is it practiced and by
whom?
?How is vegetative planting different than seed agriculture?
Location of Agricultural Hearths
?In which region(s) did vegetative planting originate?
?In which region(s) did seed agriculture originate?
?How did seed agriculture diffuse throughout different regions of the world?
?Contrast the initial the diffusion(s) of seed agriculture with more recent processes of agricultural diffusion—how and why are these processes different today?
Classifying Agricultural Regions
?What is the primary difference between agricultural production in LDCs and that in MDCs?
?Contrast subsistenc e and commercial agriculture with respect to the ―Five principle features‖ listed on p. 331 of the textbook.
?Why do geographers find it important to map agricultural regions of the world? How might such maps help us to understand agricultural processes around the world? Section 2: Where are agricultural regions in less developed countries?
TERMS
Shifting cultivation
Slash-and-burn agriculture
Pastoral nomadism
Transhumance
Pasture
Intensive subsistence agriculture/subsistence agriculture
Wet rice
Sawah
Rice paddy
Threshed
Chaff
Winnowed
Hull
Double cropping
Crop rotation
Plantation
CONCEPTS
Shifting Cultivation
?What is the difference between cultivation and agriculture?
?Where (regions in the world) is shifting cultivation primarily practiced?
?Describe the distinguishing features of shifting cultivation.
?What types of crops are typically grown in shifting cultivation?
?How is land under shifting cultivation normally owned, governed and managed?
?Is shifting cultivation a dominant form of agriculture in the world? Justify your answer.
?What are the environmental impacts of shifting cultivation?
?What are the environmental benefits of shifting cultivation?
Pastoral Nomadism
?What is pastoral nomadism? Where is it practiced in the world, and by whom?
?Pastoral nomadism is the most similar to what other type of agriculture; shifting cultivation, subsistence agriculture, commercial agriculture?
?What is the advantage of nomadism to pastoralists?
?What types of animals are commonly used in pastoral nomadism? Why are these animals well-suited to this type of agriculture?
?Describe the patterns of pastoralist nomads; seasonally and interannually.
?Is pastoralist nomadism a ?primitive‘ or more modern form of agriculture?
?What types of cultural, societal, technological and environmental changes are affecting pastoralist nomads today?
Intensive Subsistence Agriculture
?What are some of the characteristics of areas in which intensive subsistence agriculture is found? Name regions in the world where this form of agriculture is practiced.
?What types of crops are commonly grown in intensive subsistence agriculture?
?Describe the primary steps in producing wet rice, from planting the seed to processing the harvested plant for human consumption.
?What is the geographical distribution of rice production versus wheat, millet, oat, corn and soybean production in Asia?
? How is agriculture in China today different than it was during the Communist Revolution?
Plantation Farming
?Where is plantation farming practiced in the world?
?What type of agriculture is practiced in plantation farming; subsistence, intensive subsistence, commercial or shifting cultivation?
?What are the most valuable crops grown in plantation farming?
How has plantation farming changed throughout the history of the United States? Do you think plantation farming followed the same historical patterns in other regions of the world (Latin America, Southeast Asia)? Why or why not?
Key Issue 3: Where Are Agricultural Regions in More Developed Countries?
1. What factors affect the location of the following Agricultural activities in the developed world? Factors to consider include, but are not limited to, natural environment (climate and soils), access and soils, value of crops, cultural practices.
A. Mixed Crop and Livestock Farming
B. Dairy Farming
C. Grain Farming
D. Ranching
E. Mediterranean Crops
F. Commercial Gardening and Fruit
2. What is Von Thunen‘s Model? What does it look like in it‘s pure form? How does the local natural and built environment alter this? What applicat ions does Von Thunen‘s Model have beyond agriculture?
Key terms
Ceral Grain
Crop Rotation
Horticulture
Milkshed
Ranching
Spring/Winter Wheat
Truck Farming
Key Issue 4 Why Do Farmers Face Economic Difficulties?
1. What challenges do commercial farmers in the developed world face and what government and private solutions exist to ameliorate these problems?
2. How do subsistence farmers in the developing world adapting to a growing population?
3. What are the trade-offs between subsistence agriculture and export oriented agriculture for developing nations?
4. What international trader related considerations must African countries make when creating policy towards genetically modified organisms? (GMOs)
5. What strategies does the book present to increase food supply? Which of these seem most feasible to you? Why?
Key terms
Desertification
Green Revolution
Sustainable Agriculture
Week 15 Chapter 11: Industry
Part 1
Terms:
Industrial Revolution
Situation factors
Site factors
Bulk-reducing industry
Bulk-gaining industry
Single-market industry
Perishable industry
Break-of-bulk-point
Labor-intensive industry
Cottage industry
Maquiladora
Concepts:
What are the roles of maquiladoras in Ciudad Juarez, Mexico?
Why are geographers interested in ?industry‘?
What are the four industrial regions of the world, why are they important industrial areas, and what has been their general course of industrial development?
How do situation factors and site factors influence the distribution of industries?
How are situation factors critical to the copper and steel industries?
How have situation factors shaped the evolution of the steel industry?
How do proximity to markets and inputs influence industry?
What are the differences between bulk-reducing, bulk-gaining, single-market, and perishable industries? What are examples of each?
What are the three main site factors? How do they influence industries?
How has the textile industry been transformed since its inception? How do these changes correspond to it being a labor-intensive industry?
How do ?land‘ and capital function as critical site factors?
Part 2:
Definitions:
?Situation Factors
?Site Factors
?Labor-intensive industry
?High-Wage industry
?Cottage Industry
?Right-to-Work Laws (Open Shops/ Closed Shops)
?Maquiladora
?Outsourcing
?Vertical Integration
?Fordist production process
?Post-Fordist Production process
?Just-in-Time inventory
Concepts:
?Does industry take up a lot of geographical space?
?In what regions is industry currently concentrated?
?What are the two geographical costs/factors impacting industry?
?Understand the major characteristics of the three most important site factors (land, labor, capital)
?Understand the difference between labor-intensive industry and high-wage industry ?Understand why activities were historically located around sources of energy (water, wood, coal)
?Why did industry move from city centers to peripheral areas?
?Why did industry in the US move from the Northeast to the South and West?
?Understand the dynamic forces that are pushing industries into new locations
?Understand the dynamic forces that are encouraging industries to remain in traditional locations
全系列三极管应用参数代换大全
名称封装极性用途耐压电流功率频率配对管 9012 贴片PNP低频放大50V 0.5A 0.625W 9013 9012 21 PNP低频放大50V 0.5A 0.625W 9013 9013 21 NPN 低频放大50V 0.5A0.625W 9012 9013 贴片NPN 低频放大50V 0.5A 0.625W 9012 9014 21 NPN 低噪放大50V 0.1A0.4W 150HMZ 9015 9015 21 PNP低噪放大50V 0.1A0.4W 150MHZ 9014 9018 21 NPN 高频放大30V 0.05A0.4W 1000MHZ 8050 21 NPN 高频放大40V 1.5A1W 100MHZ 8550 8550 21 PNP高频放大40V 1.5A1W 100MHZ 8050 2N2222 21 NPN 通用60V 0.8A 0.5W 25／200NS 2N2369 4A NPN 开关40V 0.5A 0.3W 800MHZ 2N2907 4A NPN 通用60V 0.6A 0.4W 26／70NS 2N3055 12 NPN 功率放大100V 15A 115W MJ2955 2N3440 6 NPN 视放开关450V 1A1W 15MHZ 2N6609 2N3773 12 NPN 音频功放开关160V 16A50W 2N3904 21E NPN 通用60V 0.2A 2N2906 21C PNP 通用40V 0.2A 2N2222A 21铁NPN 高频放大75V 0.6A 0.625W 300MHZ 2N6718 21铁NPN 音频功放开关100V 2A 2W 2N5401 21 PNP视频放大160V 0.6A 0.625W 100MHZ 2N5551 2N5551 21 NPN 视频放大160V 0.6A 0.625W 100MHZ 2N5401 2N5685 12 NPN 音频功放开关60V 50A 300W 2N6277 12 NPN 功放开关180V 50A 250W 2N6678 12 NPN 音频功放开关650V 15A 175W 15MHZ 3DA87A 6 NPN 视频放大100V 0.1A1W 3DG6B 6 NPN 通用20V 0.02A 0.1W 150MHZ 3DG6C 6 NPN 通用25V 0.02A 0.1W 250MHZ 3DG6D 6 NPN 通用30V 0.02A 0.1W 150MHZ 3DK2B 7 NPN 开关30V 0.03A 0.2W 3DD15D 12 NPN 电源开关300V 5A 50W 3DD102C 12 NPN 电源开关300V 5A 50W 3522V 5V稳压管 5609 21 NPN 音频低频放大50V 0.8A 0.625W 5610 5610 21 PNP音频低频放大50V 0.8A 0.625W 5610 60MIAL1 电磁／微波炉1000V 60A 300W 9626 21 NPN 通用 MPSA42 21E NPN 电话视频放大300V 0.5A 0.625W MPSA92 MPSA92 21E PNP 电话视频放大300V 0.5A 0.625W MPSA42 MPS2222A 21 NPN 高频放大75V 0.6A 0.625W 300MHZ A634 28E PNP 音频功放开关40V 2A 10W A708 6 PNP 音频开关80V 0.7A 0.8W A715C 29 PNP 音频功放开关35V 2.5A 10W 160MHZ A733 21 PNP 通用50V 0.1A180MHZ
三极管型号参数查询大全
三极管型号及参数 晶体管型号反压Vbe0电流Icm功率Pcm放大系数特征频率管子类型IRFU02050V15A42W**NMOS场效应IRFPG421000V4A150W**NMOS场效应IRFPF40900V 4.7A150W**NMOS场效应IRFP9240200V12A150W**PMOS场效应IRFP9140100V19A150W**PMOS场效应IRFP460500V20A250W**NMOS场效应IRFP450500V14A180W**NMOS场效应IRFP440500V8A150W**NMOS场效应IRFP353350V14A180W**NMOS场效应IRFP350400V16A180W**NMOS场效应IRFP340400V10A150W**NMOS场效应IRFP250200V33A180W**NMOS场效应IRFP240200V19A150W**NMOS场效应IRFP150100V40A180W**NMOS场效应晶体管型号反压Vbe0电流Icm功率Pcm放大系数特征频率管子类型IRFP140100V30A150W**NMOS场效应IRFP05460V65A180W**NMOS场效应IRFI744400V4A32W**NMOS场效应IRFI730400V4A32W**NMOS场效应IRFD9120100V1A1W**NMOS场效应IRFD12380V 1.1A1W**NMOS场效应IRFD120100V 1.3A1W**NMOS场效应IRFD11360V0.8A1W**NMOS场效应IRFBE30800V 2.8A75W**NMOS场效应IRFBC40600V 6.2A125W**NMOS场效应IRFBC30600V 3.6A74W**NMOS场效应IRFBC20600V 2.5A50W**NMOS场效应IRFS9630200V 6.5A75W**PMOS场效应IRF9630200V 6.5A75W**PMOS场效应IRF9610200V1A20W**PMOS场效应晶体管型号反压Vbe0电流Icm功率Pcm放大系数特征频率管子类型IRF954160V19A125W**PMOS场效应IRF953160V12A75W**PMOS场效应IRF9530100V12A75W**PMOS场效应IRF840500V8A125W**NMOS场效应IRF830500V 4.5A75W**NMOS场效应IRF740400V10A125W**NMOS场效应IRF730400V 5.5A75W**NMOS场效应IRF720400V 3.3A50W**NMOS场效应IRF640200V18A125W**NMOS场效应IRF630200V9A75W**NMOS场效应IRF610200V 3.3A43W**NMOS场效应IRF54180V28A150W**NMOS场效应IRF540100V28A150W**NMOS场效应IRF530100V14A79W**NMOS场效应
三极管代换大全
用万用表检测三极管时，第一次表盘有读数，第二次就没读数，是为什么？还有就是用hfe档位怎样检测三极管？ 回答:4 人气:14 提问时间:2009-10-25 21:15 答案 指针万用表测三极管好坏，极性:
①测 NPN 三极管:将万用表欧姆挡置"R × 100" 或"R × lk" 处,把黑表笔接在基极上,将红表笔先后接在其余两个极上,如果两次测得的电阻值都较小,再将红表笔接在基极上,将黑表笔先后接在其余两个极上,如果两次测得的电阻值都很大,则说明三极管是好的。 ②测 PNP 三极管:将万用表欧姆挡置"R × 100" 或"R × lk" 处,把红表笔接在基极上,将黑表笔先后接在其余两个极上,如果两次测得的电阻值都较小,再将黑表笔接在基极上,将红表笔先后接在其余两个极上,如果两次测得的电阻值都很大,则说明三极管是好的。 当三极管上标记不清楚时,可以用万用表来初步确定三极管的好坏及类型 (NPN 型还是 PNP 型 ),并辨别出e、b、c三个电极。测试方法如下 : ①用指针式万用表判断基极 b 和三极管的类型:将万用表欧姆挡置"R × 100" 或"R×lk" 处,先假设三极管的某极为"基极",并把黑表笔接在假设的基极上,将红表笔先后接在其余两个极上,如果两次测得的电阻值都很小(或约为几百欧至几千欧 ),则假设的基极是正确的,且被测三极管为 NPN 型管；同上,如果两次测得的电阻值都很大( 约为几千欧至几十千欧 ), 则假设的基极是正确的,且被测三极管为 PNP 型管。如果两次测得的电阻值是一大一小,则原来假设的基极是错误的,这时必须重新假设另一电极为"基极"，再重复上述测试。 ②判断集电极c和发射极e:仍将指针式万用表欧姆挡置"R × 100"或"R × 1k" 处,以NPN管为例,把黑表笔接在假设的集电极c上,红表笔接到假设的发射极e上,并用手捏住b和c极 ( 不能使b、c直接接触 ), 通过人体 , 相当 b 、 C 之间接入偏置电阻 , 读出表头所示的阻值 , 然后将两表笔反接重测。若第一次测得的阻值比第二次小 , 说明原假设成立 , 因为 c 、 e 问电阻值小说明通过万用表的电流大 , 偏置正常 数字万用表测量三极管图解： 回答采纳率:26.9% 2009-10-25 21:22 测三极管：通常我们要用R×1kΩ档，不管是NPN管还是PNP管，不管是小功率、中功率、大功率管，测其be结cb结都应呈现与二极管完全相同的单向导电性，反向电阻无穷大，其正向电阻大约在10K左右。为进一步估测管子特性的好坏，必要时还应变换电阻档位进行多次测量，方法是：置R×10Ω档测PN结正向导通电阻都在大约200Ω左右；置R×1Ω档测PN结正向导通电阻都在大约30Ω左右，（以上为47型表测得数据，其它型号表大概略有不同，可多试测几个好管总结一下，做到心中有数）如果读数偏大太多，可以断定管子的特性不好。还可将表置于R×10kΩ再测，耐压再低的管子（基本上三极管的耐压都在30V以上），其cb结反向电阻也应在∞，但其be结的反向电阻可能会有些，表针会稍有偏转（一般不会超过满量程的1/3，根据管子的耐压不同而不同）。同样，在用R×10kΩ档测ec间(对NPN管）或ce间（对PNP 管）的电阻时，表针可能略有偏转，但这不表示管子是坏的。但在用R×1kΩ以下档测ce或ec间电阻时，表头指示应为无穷大，否则管子就是有问题。应该说明一点的是，以上测量是针对硅管而言的，对锗管不适用。不过现在锗管也很少见了。另外，所说的“反向”是针对PN 结而言，对NPN管和PNP管方向实际上是不同的。 现在常见的三极管大部分是塑封的，如何准确判断三极管的三只引脚哪个是b、c、e？三极管的b极很容易测出来，但怎么断定哪个是c哪个是e？这里推荐三种方法：第一种方法：对于有测三极管hFE插孔的指针表，先测出b极后，将三极管随意插到插孔中去（当然b极是可以插准确的），测一下hFE值，然后再将管子倒过来再测一遍，测得hFE值比较大的一次，各管脚插入的位置是正确的。第二种方法：对无hFE测量插孔的表，或管子太大不方便插入插孔的，可以用这种方法：对NPN管，先测出b极（管子是NPN还是PNP以及其b脚都很容易测出，是吧？），将表置于R×1kΩ档，将红表笔接假设的e极（注意拿红表笔的手不要碰到表笔尖或
三极管大全
2SC3943,panasonic,TO-220F,DIP/三极管,NPN,50V,0.15A, 2SC1755D,SANYO,TO-220,DIP/三极管,NPN,300V,0.2A, 2SC3866,TO-220F,FUJ,DIP/三极管,NPN,800V,3A 2SC4635LS TO-220F SANYO DIP/三极管 NPN 1500V 0.02A HI772 TO-251 HJ/华昕 DIP/三极管 PNP -30V -3A HI882 TO-251 HJ/华昕 DIP/三极管 NPN 30V 3A HJ772 SOT-252 HJ/华昕 SMD/三极管 PNP -30V -3A HJ882 SOT-252 HJ/华昕 SMD/三极管 NPN 30V 3A 2SA1216 SK MT-200 DIP/三极管 PNP -180V -17A 2SC2922 SK MT-200 DIP/三极管 NPN 180V 17A FZT753 ZETEX SOT-223 SMD/三极管 PNP -100V -3A BCP53 PHILIPS SOT-223 SMD/三极管 PNP -80V -1A STN817 ST SOT-223 SMD/三极管 PNP -80V -1.5A FZT792A ZETEX SOT-223 SMD/三极管 PNP -70V -2A BCP52 PHILIPS SOT-223 SMD/三极管 PNP -60V -1A FZT591 ZETEX SOT-223 SMD/三极管 PNP -60V -1A FZT751 ZETEX SOT-223 SMD/三极管 PNP -60V -3A BCP51 PHILIPS SOT-223 SMD/三极管 PNP -45V -1A FZT1151A ZETEX SOT-223 SMD/三极管 PNP -40V -3A FZT790A ZETEX SOT-223 SMD/三极管 PNP -40V -3A PBSS5540Z PHILIPS SOT-223 SMD/三极管 PNP -40V -5A FZT549 ZETEX SOT-223 SMD/三极管 PNP -30V -1A FZT949 ZETEX SOT-223 SMD/三极管 PNP -30V -5.5A FZT749 ZETEX SOT-223 SMD/三极管 PNP -25V -3A FZT789A ZETEX SOT-223 SMD/三极管 PNP -25V -3A 2SB1386 ROHM SOT-223 SMD/三极管 PNP -20V -5A FZT948 ZETEX SOT-223 SMD/三极管 PNP -20V -6A FZT788B ZETEX SOT-223 SMD/三极管 PNP -15V 3A FZT717 ZETEX SOT-223 SMD/三极管 PNP -12V -3A STN851 ST SOT-223 SMD/三极管 NPN 60V 5A FZT692B ZETEX SOT-223 SMD/三极管 NPN 70V 2A STN715 ST SOT-223 SMD/三极管 NPN 80V 1.5A FMMT560 ZETEX SOT-23 SMD/三极管 PNP -500V -0.15A MMBT5401 ON SOT-23 SMD/三极管 PNP -150V -0.1A MMBT2907A FAIRCHILD SOT-23 SMD/三极管 PNP -60V -0.6A A1015 SOT-23 SMD/三极管 PNP -50V -0.15A PDTA144WK PHILIPS SOT-23 SMD/三极管 PNP -50V -0.1A MMBT8550 ON SOT-23 SMD/三极管 PNP -25V -0.6A S8550 贴片长电 SOT-23 SMD/三极管 PNP -25V -0.5A S9012 长电 SOT-23 SMD/三极管 PNP -25V -0.5A SS8550 贴片长电 SOT-23 SMD/三极管 PNP -25V -1.5A 2SC9012 LRC SOT-23 SMD/三极管 0V 0A 2SC3904 NEC SOT-23 SMD/三极管 NPN 10V 0.065A 2SC3356 台产 SOT-23 SMD/三极管 NPN 12V 0.1A
贴片三极管参数大全(材料相关)
贴片三极管上的印字与真实名称的对照表印字器件厂商类型封装器件用途及参数 -28 PDTA114WU Phi N SOT323 pnp dtr -24 PDTC114TU Phi N SOT323 npn dtr R1 10k -23 PDTA114TU Phi N SOT323 pnp dtr R1 10k -20 PDTC114WU Phi N SOT323 npn dtr -6 PMSS3906 Phi N SOT323 2N3906 -4 PMSS3904 Phi N SOT323 2N3904 0 2SC3603 Nec CX SOT173 Npn RF fT 7GHz 1 Gali-1 MC AZ SOT89 DC-8GHz MMIC amp 12dB gain 1 2SC3587 Nec CX - npn RF fT10GHz 1 BA277 Phi I SOD523 VHF Tuner band switch diode 2 BST82 Phi M - n-ch mosfet 80V 175mA 2 MRF5711L Mot X SOT14 3 npn RF MRF571 2 DTCC114T Roh N - 50V 100mA npn sw + 10k base res 2 Gali-2 MC AZ SOT89 DC-8GHz MMIC amp 16dB gain 2 BAT62-02W Sie I SCD80 BAT16 schottky diode 2 2SC3604 Nec CX - npn RF fT8GHz 12dB@2GHz 3 Gali-3 MC AZ SOT89 DC-3GHz MMIC amp 22dB gain 3 DTC143TE Roh N EMT3 npn dtr R1 4k7 50V 100mA 3 DTC143TUA Roh N SC70 npn dtr R1 4k7 50V 100mA 3 DTC143TKA Roh N SC59 npn dtr R1 4k7 50V 100mA 3 BAT60A Sie I SOD323 10V 3A sw schottky 3 BAT62-02W Sie I SCD80 - 4 DTC114TCA Roh N SOT23 npn dtr R1 10k 50V 100mA 4 DTC114TE Roh N EMT3 npn dtr R1 10k 50V 100mA 4 DTC114TUA Roh N SC70 npn dtr R1 10k 50V 100mA 4 DTC114TKA Roh N SC59 npn dtr R1 10k 50V 100mA 4 MRF5211L Mot X SOT143 pnp RF MRF521 4 Gali-4 MC AZ SOT89 DC-4GHz MMIC amp 17. 5 dBm 4 BB664 Sie I SCD80 Varicap 42-2.5pF 5 SSTPAD5 Sil J - PAD-5 5pA leakage diode 5 Gali-4 MC AZ SOT89 DC-4GHz MMIC amp 18 dBm o/p 5 DTC124TE Roh N EMT3 npn dtr R1 22k 50V 100mA 5 DTC124TUA Roh N SC70 npn dtr R1 22k 50V 100mA 5 DTC124TKA Roh N SC59 npn dtr R1 22k 50V 100mA 6 Gali-6 MC AZ SOT89 DC-4GHz MMIC amp 115 dBm o/p 6 DTC144TE Roh N EMT3 npn dtr R1 47k 50V 100mA 6 DTC144TUA Roh N SC70 npn dtr R1 47k 50V 100mA 6 DTC144TKA Roh N SC59 npn dtr R1 47k 50V 100mA 9 DTC115TUA Roh N SC70 npn dtr R2 100k 50V 100mA 9 DTC115TKA Roh N SC59 npn dtr R2 100k 50V 100mA 9 BC849 Mot N SOT23 BC 549B
三极管参数大全,包括9011、9012、9013、9014、9015等
HIT5609 NPN 三极管 △ 主要用途： 主要用于开关、音频放大，适用于应急灯、电动玩具等电子 产品。（与HIT5610互补） △ 极限值（TA=25℃） △ 电参数（Ta=25℃） 参数 符号 测试条件 最小值典型值 最大值单 位集电极漏电流 I CBO V CB =25V,I E =0 100 nA 发射极漏电流 I EBO V BE =5V,I C =0 100 nA 基极漏电流 I CEO V CE =20V,I B =0 5 μA 集电极、发射极击穿电压 BV CEO I C =10mA,I B =0 20 V 发射极、基极击穿电压 BV EBO I E =1mA,I C =0 6 V 集电极、基极击穿电压 BV CBO I C =100μA,I E =0 25 V 集电极、发射极饱和压降 V CE (sat) I C =0.8A,I B =0.08A 0.5 V 基极、发射极饱和压降 V BE (on) V CE =2V,I C =0.5A 1.0 V 直流电流增益 H FE1 V CE =2V,I C =0.5A 120 240 H FE2 V CE =2V,I C =1mA 105 H FE3 V CE =2V,I C =10mA 110 脉冲方式测试：PW ≤300μs;占空比≤2% 实际分如档： B C 1 C 2 120-160 160-200 200-240 脚位排列与快捷三星 相同 TO-92 1. 发射极 E 2. 集电极 C 3. 基 极 B 参数 符号 标称值 单位集电极、基极击穿电压 V CBO 25 V 集电极、发射极击穿电压 V CEO 20 V 发射极、基极击穿电压 V EBO 5 V 集电极电流 I C 1.5 A 集电极功率 P C 2 W 结温 T J 150 ℃ 贮存温 T STG -55-150 ℃
贴片三极管参数大全
贴片三极管上的印字与真实名称的对照表 印字器件厂商类 型 封装器件用途及参数 -28 PDTA114WU Phi N SOT323 pnp dtr -24 PDTC114TU Phi N SOT323 npn dtr R1 10k -23 PDTA114TU Phi N SOT323 pnp dtr R1 10k -20 PDTC114WU Phi N SOT323 npn dtr -6 PMSS3906 Phi N SOT323 2N3906 -4 PMSS3904 Phi N SOT323 2N3904 0 2SC3603 Nec CX SOT173 Npn RF fT 7GHz 1 Gali-1 MC AZ SOT89 DC-8GHz MMIC amp 12dB gain 1 2SC3587 Nec CX - npn RF fT10GHz 1 BA277 Phi I SOD523 VHF Tuner band switch diode 2 BST82 Phi M - n-ch mosfet 80V 175mA 2 MRF5711L Mot X SOT14 3 npn RF MRF571 2 DTCC114T Roh N - 50V 100mA npn sw + 10k base res 2 Gali-2 MC AZ SOT89 DC-8GHz MMIC amp 16dB gain 2 BAT62-02W Sie I SCD80 BAT16 schottky diode 2 2SC3604 Nec CX - npn RF fT8GHz 12dB@2GHz 3 Gali-3 MC AZ SOT89 DC-3GHz MMIC amp 22dB gain 3 DTC143TE Roh N EMT3 npn dtr R1 4k7 50V 100mA 3 DTC143TUA Roh N SC70 npn dtr R1 4k7 50V 100mA 3 DTC143TKA Roh N SC59 npn dtr R1 4k7 50V 100mA 3 BAT60A Sie I SOD323 10V 3A sw schottky 3 BAT62-02W Sie I SCD80 - 4 DTC114TCA Roh N SOT23 npn dtr R1 10k 50V 100mA 4 DTC114TE Roh N EMT3 npn dtr R1 10k 50V 100mA 4 DTC114TUA Roh N SC70 npn dtr R1 10k 50V 100mA 4 DTC114TKA Roh N SC59 npn dtr R1 10k 50V 100mA 4 MRF5211L Mot X SOT143 pnp RF MRF521 4 Gali-4 MC AZ SOT89 DC-4GHz MMIC amp 17. 5 dBm 4 BB664 Sie I SCD80 Varicap 42-2.5pF 5 SSTPAD5 Sil J - PAD-5 5pA leakage diode 5 Gali-4 MC AZ SOT89 DC-4GHz MMIC amp 18 dBm o/p 5 DTC124TE Roh N EMT3 npn dtr R1 22k 50V 100mA 5 DTC124TUA Roh N SC70 npn dtr R1 22k 50V 100mA 5 DTC124TKA Roh N SC59 npn dtr R1 22k 50V 100mA 6 Gali-6 MC AZ SOT89 DC-4GHz MMIC amp 115 dBm o/p 6 DTC144TE Roh N EMT3 npn dtr R1 47k 50V 100mA 6 DTC144TUA Roh N SC70 npn dtr R1 47k 50V 100mA 6 DTC144TKA Roh N SC59 npn dtr R1 47k 50V 100mA 9 DTC115TUA Roh N SC70 npn dtr R2 100k 50V 100mA 9 DTC115TKA Roh N SC59 npn dtr R2 100k 50V 100mA 9 BC849 Mot N SOT23 BC 549B 10 SSTPAD10 Sil J - PAD-10 10pA leakage diode
常用三极管全参数大全
MPSA42 NPN 21E 电话视频放大300V0.5A0.625W MPSA92 PNP 21E 电话视频放大300V0.5A0.625W MPS2222A NPN 21 高频放大75V0.6A0.625W300MHZ 9011 NPN EBC 高频放大50V30mA0.4W150MHz 9012 PNP 贴片低频放大50V0.5A0.625W 9013 NPN EBC 低频放大50V0.5A0.625W 9013 NPN 贴片低频放大50V0.5A0.625W 9014 NPN EBC 低噪放大50V0.1A0.4W150MHZ 9015 PNP EBC 低噪放大50V0.1A0.4W150MHZ 9018 NPN EBC 高频放大30V50MA0.4W1GHZ 8050 NPN EBC 高频放大40V1.5A1W100MHZ 8550 PNP EBC 高频放大40V1.5A1W100MHZ 2N2222 NPN 4A 高频放大60V0.8A0.5W25/200NSβ=45 2N2222A NPN 小铁高频放大75V0.6A0.625W300MHZ 2N2369 NPN 4A 开关40V0.5A0.3W800MHZ 2N2907 NPN 4A 通用60V0.6A0.4W26/70NSβ=200 2N3055 NPN 12 功率放大100V15A115W 2N3440 NPN 6 视放开关450V1A1W15MHZ 2N3773 NPN 12 音频功放开关160V16A150W COP 2N6609 2N3904 NPN 21E 通用60V0.2Aβ=100-400 2N3906 PNP 21E 通用40V0.2Aβ=100-400 2N5401 PNP 21E 视频放大160V0.6A0.625W100MHZ 2N5551 NPN 21E 视频放大160V0.6A0.625W100MHZ 2N5685 NPN 12 音频功放开关60V50A300W 2N6277 NPN 12 功放开关180V50A250W
三极管参数大全
三极管知识简介 概述 半导体三极管也称为晶体三极管，可以说它是电子电路中最重要的器件。它最主要的功能是电流放大和开关作用。三极管顾名思义具有三个电极。二极管是由一个PN结构成的，而三极管由两个PN结构成，共用的一个电极成为三极管的基极(用字母b表示)。其他的两个电极成为集电极(用字母c表示)和发射极(用字母e表示)。由于不同的组合方式，形成了一种是NPN型的三极管，另一种是PNP型的三极管。 三极管的种类很多，并且不同型号各有不同的用途。三极管大都是塑料封装或金属封装，常见三极管的外观，有一个箭头的电极是发射极，箭头朝外的是NPN型三极管，而箭头朝内的是PNP型。实际上箭头所指的方向是电流的方向。 电子制作中常用的三极管有90××系列，包括低频小功率硅管9013(NPN)、9012(PNP)，低噪声管9014(NPN)，高频小功率管9018(NPN)等。它们的型号一般都标在塑壳上，而样子都一样，都是TO-92标准封装。在老式的电子产品中还能见到3DG6(低频小功率硅管)、3AX31(低频小功率锗管)等，它们的型号也都印在金属的外壳上。我国生产的晶体管有一套命名规则，电子工程技术人员和电子爱好者应该了解三极管符号的含义。 符号的第一部分“3”表示三极管。符号的第二部分表示器件的材料和结构：A——PNP型锗材料；B——NPN型锗材料；C——PNP型硅材料；D——NPN型硅材料。符号的第三部分表示功能：U——光电管；K——开关管；X——低频小功率管；G——高频小功率管；D——低频大功率管；A——高频大功率管。另外，3DJ型为场效应管，BT打头的表示半导体特殊元件。
三极管最基本的作用是放大作用，它可以把微弱的电信号变成一定强度的信号，当然这种转换仍然遵循能量守恒，它只是把电源的能量转换成信号的能量罢了。三极管有一个重要参数就是电流放大系数 b。当三极管的基极上加一个微小的电流时，在集电极上可以得到一个是注入电流b 倍的电流，即集电极电流。集电极电流随基极电流的变化而变化，并且基极电流很小的变化可以引起集电极电流很大的变化，这就是三极管的放大作用。 三极管还可以作电子开关，配合其它元件还可以构成振荡器。 三极管的分类: a.按材质分: 硅管、锗管 b.按结构分: NPN 、PNP c.按功能分: 开关管、功率管、达林顿管、光敏管等. d. 按功率分：小功率管、中功率管、大功率管 e.按工作频率分：低频管、高频管、超频管 f.按结构工艺分：合金管、平面管 Z304三极管的主要参数及极性判别 1．常用小功率三极管的主要参数 常用小功率三极管的主要参数，参见表B311。
三极管型号
三极管型号大全_贴片三极管型号大全(二) 发布: | 作者: | 来源: zhongruizheng | 查看:12594次| 用户关注： 三极管型号大全：D1431NPN28B彩行1500V5A80Wβ=20D1433NPN28B彩行1500V7A80Wβ=20D1439NPNBCE彩行1500V3A80Wβ=8D1541NPN28B彩行1500V3A80Wβ=20D1545NPN28B彩行1500V5A50Wβ=20D1547NPNBCE彩行1500V7A80Wβ=20D1554NPNBCE彩行1500V3.5A80Wβ=12D1555NPNBCE彩行1500V5A80Wβ=12D1556NPNBCE彩行1500V6A80Wβ=12D1559NPNBCE达林顿功放100V20A100Wβ=5000/B1079D1590NPN28达林顿功放150V8A25Wβ=15000D1632NPN28B彩行1500V4A70WD1640N 三极管型号大全： D1431 NPN 28B 彩行1500V5A80Wβ=20 D1433 NPN 28B 彩行1500V7A80Wβ=20 D1439 NPN BCE 彩行1500V3A80Wβ=8 D1541 NPN 28B 彩行1500V3A80Wβ=20 D1545 NPN 28B 彩行1500V5A50Wβ=20 D1547 NPN BCE 彩行1500V7A80Wβ=20 D1554 NPN BCE 彩行1500V3.5A80Wβ=12 D1555 NPN BCE 彩行1500V5A80Wβ=12 D1556 NPN BCE 彩行1500V6A80Wβ=12 D1559 NPN BCE 达林顿功放100V20A100Wβ=5000/B1079 D1590 NPN 28 达林顿功放150V8A25W β=15000 D1632 NPN 28B 彩行1500V4A70W D1640 NPN 29 达林顿功放120V2A1.2W β=4000-40000 D1651 NPN SP 彩行1500V5A60W3MHZ D1710 NPN BCE 彩行1500V5A50W D1718 NPN 28C 音频功放180V15A3.5W20MHZ D1762 NPN BCE 音频功放开关60V3A25W90MHZ /B1185 D1843 NPN BCE 低噪放大50V1A1W D1849 NPN 50A 彩行1500V7A120W D1850 NPN 50A 彩行1500V7A120W D1859 NPN 50A 音频80V0.7A1W120MHZ D1863 NPN 50A 音频120V1A1W100MHZ D1877 NPN 30 彩行1500V4A50W(带阻尼) D1879 NPN 30 彩行1500V6A60W(带阻尼) D1887 NPN 30 彩行1500V10A70W D1930 NPN 21 达林顿达林顿100V2A1.2Wβ=1000 D1975 NPN 53A 音频功放180V15A150W B1317 D1978 NPN 21 达林顿120V1.5A0.9Wβ=30000 D1980 NPN 61B 达林顿100V2A10Wβ=1000-10000 |D1981 NPN ECB 达林顿100V2A1W D1993 NPN 45B 音频低噪55V0.1A0.4W D1994A NPN ECB 音频驱动60V1A1W D1997 NPN 45B 激励管40V3A1.5W100MHZ D2008 NPN ECB 音频功放80V1A1.2W D2012 NPN BCE 音频功放60V3A2W3MHZ D2136 NPN ECB 功放80V1A1.2W D2155 NPN 53A 音频功放180V15A150W D2256 NPN 46 达林顿功放120V25A125Wβ=2000-20000 D2334 NPN 28B 彩行1500V5A80W
常用三极管型号大全
名称封装极性功能耐压电流功率频率配对管2N2222A 21铁NPN高频放大75V0.6A0.625W300MHZ 2N2222 21NPN通用60V0.8A0.5W25／200NS 2N2369 4A NPN开关40V0.5A0.3W800MHZ 2N2906 21C PNP通用40V0.2A 2N2907 4A NPN通用60V0.6A0.4W26／70NS 2N3055 12NPN功率放大100V15A115W MJ2955 2N3440 6NPN视放开关450V1A1W15MHZ2N6609 2N3773 12NPN音频功放开关160V16A50W 2N3904 21E NPN通用60V0.2A 2N5401 21PNP视频放大160V0.6A0.625W100MHZ2N5551 2N5551 21NPN视频放大160V0.6A0.625W100MHZ2N5401 2N5685 12NPN音频功放开关60V50A300W 2N6050 12PNP音频功放开关60V12A150W 2N6051 12PNP音频功放开关80V12A150W 2N6277 12NPN功放开关180V50A250W 2N6609 12PNP音频功放开关160V15A150W＞2MHZ2N3773 2N6678 12NPN音频功放开关650V15A175W15MHZ 2N6718 21铁音频功放开关100V2A2W 3522V NPN稳压管5V 3D15D 12NPN电源开关300V5A50W 3DA87A 6NPN视频放大100V0.1A1W 3DD15D 12NPN电源开关300V5A50W 3DD102C 12NPN电源开关300V5A50W 3DG6B 6NPN通用20V0.02A0.1W150MHZ 3DG6C 6NPN通用25V0.02A0.1W250MHZ 3DG6D 6NPN通用30V0.02A0.1W150MHZ 3DK2B 7NPN开关30V0.03A0.2W 3DK4B 7 NPN开关40V0.8A0.8W 3DK7C 7NPN开关25V0.05A0.3W 8050 21NPN高频放大40V 1.5A1W100MHZ8550 8550 21PNP高频放大40V 1.5A1W100MHZ8050 9012 21PNP低频放大50V0.5A0.625W9013 9012 贴片PNP低频放大50V0.5A0.625W9013 9013 21NPN低频放大50V0.5A0.625W9012 9013 贴片NPN低频放大50V0.5A0.625W9012 9014 21NPN低噪放大50V0.1A0.4W150HMZ9015 9015 21PNP低噪放大50V0.1A0.4W150HMZ9014 9018 21NPN高频放大30V0.05A0.4W1000MHZ A1009 BCE PNP功放开关350V2A15W A1013 21PNP视频放大160V1A0.9W C2383 A1015 21PNP通用60V0.1A0.4W8MHZ C1815 A1020 21PNP音频开关50V2A0.9W A1123 21PNP低噪放大150V0.05A0.75W A1162 21D PNP通用贴片50V0.15A0.15W A1175PNP通用60V0.1A0.25W180MHZ A1213 贴片PNP超高频50V0.15A80MHZ
二极管及三极管电路标记大全
二极管及三极管符号大全【图】 二极管符号参数 二 极管符号意义 、管路敷设技术通过管线不仅可以解决吊顶层配置不规范高中资料试卷问题，而且可保障各类管路习题到位。在管路敷设过程中，要加强看护关于管路高中资料试卷连接管口处理高中资料试卷弯扁度固定盒位置保护层防腐跨接地线弯曲半径标等，要求技术交底。管线敷设技术中包含线槽、管架等多项方式，为解决高中语文电气课件中管壁薄、接口不严等问题，合理利用管线敷设技术。线缆敷设原则：在分线盒处，当不同电压回路交叉时，应采用金属隔板进行隔开处理；同一线槽内强电回路须同时切断习题电源，线缆敷设完毕，要进行检查和检测处理。、电气课件中调试对全部高中资料试卷电气设备，在安装过程中以及安装结束后进行 高中资料试卷调整试验；通电检查所有设备高中资料试卷相互作用与相互关系，根据生产工艺高中资料试卷要求，对电气设备进行空载与带负荷下高中资料试卷调控试验；对设备进行调整使其在正常工况下与过度工作下都可以正常工作；对于继电保护进行整核对定值，审核与校对图纸，编写复杂设备与装置高中资料试卷调试方案，编写重要设备高中资料试卷试验方案以及系统启动方案；对整套启动过程中高中资料试卷电气设备进行调试工作并且进行过关运行高中资料试卷技术指导。对于调试过程中高中资料试卷技术问题，作为调试人员，需要在事前掌握图纸资料、设备制造厂家出具高中资料试卷试验报告与相关技术资料，并且了解现场设备高中资料试卷布置情况与有关高中资料试卷电气系统接线等情况 ，然后根据规范与规程规定，制定设备调试高中资料试卷方案。 、电气设备调试高中资料试卷技术电力保护装置调试技术，电力保护高中资料试卷配置技术是指机组在进行继电保护高中资料试卷总体配置时，需要在最大限度内来确保机组高中资料试卷安全，并且尽可能地缩小故障高中资料试卷破坏范围，或者对某些异常高中资料试卷工况进行自动处理，尤其要避免错误高中资料试卷保护装置动作，并且拒绝动作，来避免不必要高中资料试卷突然停机。因此，电力高中资料试卷保护装置调试技术，要求电力保护装置做到准确灵活。对于差动保护装置高中资料试卷调试技术是指发电机一变压器组在发生内部故障时，需要进行外部电源高中资料试卷切除从而采用高中资料试卷主要保护装置。
部分常见三极管参数大全
部分常见三极管参数大全[1] 晶体管型号反压Vbe0电流IC m功率PCM放大系数特征频率管子类型2SA1012Y 60V 5A 25W * * PNP 2SC752G 40V 0.2A 0.2W * * NPN 2SA1013R 160V 1A 0.9W * * PNP 2SA933S 50V 0.1A 0.9W * * PNP BF324 30V 0.26A 0.25W * * PNP BD941F 120V 3A 19W * * NPN BC636 45V 1A 0.8W * * PNP 2SD1480 80V 4A 25W * * NPN 2SC3271 300V 0.1A 5W * * NPN 2SC2688 300V 0.2A 10W * * NPN 2SC1875 50V 0.15A 0.4W * * NPN 2SA1175H 50V 0.1A 0.3W * * PNP 2SD1138C 150V 2A 30W * * NPN 2SB882 60V - 1.7W * * PNP 2SC2377 20V 0.015A 0.2W * * NPN 晶体管型号反压Vbe0电流Icm功率Pcm放大系数特征频率管子类型 IRFU020 50V 15A 42W * * NMOS场效应IR FP G42 1000V 4A 150W * * NMOS场效应IRFPF40 900V 4.7A 150W * * NMOS场效应IRFP9240 200V 12A 150W * * PMOS场效应IRFP9140 100V 19A 150W * * PMOS场效应IRFP460 500V 20A 250W * * NMOS场效应IRFP450 500V 14A 180W * * NMOS场效应IRFP440 500V 8A 150W * * NMOS场效应
三极管型号大全
常用三极管型号参数大全 MPS2222A NPN 21 高频放大75V0.6A0.625W300MHZ 9011 NPN EBC 高频放大50V30mA0.4W150MHz 9012 PNP 贴片低频放大50V0.5A0.625W 9013 NPN EBC 低频放大50V0.5A0.625W 9013 NPN 贴片低频放大50V0.5A0.625W 9014 NPN EBC 低噪放大50V0.1A0.4W150MHZ 9015 PNP EBC 低噪放大50V0.1A0.4W150MHZ 9018 NPN EBC 高频放大30V50MA0.4W1GHZ 8050 NPN EBC 高频放大40V1.5A1W100MHZ 8550 PNP EBC 高频放大40V1.5A1W100MHZ 2N2222 NPN 4A 高频放大60V0.8A0.5W25/200NSβ=45 2N2222A NPN 小铁高频放大75V0.6A0.625W300MHZ 2N2369 NPN 4A 开关40V0.5A0.3W800MHZ 2N2907 NPN 4A 通用60V0.6A0.4W26/70NSβ=200 2N3055 NPN 12 功率放大100V15A115W 2N3440 NPN 6 视放开关450V1A1W15MHZ 2N3773 NPN 12 音频功放开关160V16A150W COP 2N6609 2N3904 NPN 21E 通用60V0.2Aβ=100-400 2N3906 PNP 21E 通用40V0.2Aβ=100-400 2N5401 PNP 21E 视频放大160V0.6A0.625W100MHZ 2N5551 NPN 21E 视频放大160V0.6A0.625W100MHZ 2N5685 NPN 12 音频功放开关60V50A300W 2N6277 NPN 12 功放开关180V50A250W 2N6609 PNP 12 音频功放开关160V15A150W COP 2N3773 2N6678 NPN 12 音频功放开关650V15A175W15MHZ 2N6718 NPN 小铁音频功放开关100V2A2W50MHZ 3DA87A NPN 6 视频放大100V0.1A1W 3DG6A NPN 6 通用15V20mA0.1W100MHz 3DG6B NPN 6 通用20V20mA0.1W150MHz 3DG6C NPN 6 通用20V20mA0.1W250MHz 3DG6D NPN 6 通用30V20mA0.1W150MHz 3DG12C NPN 7 通用45V0.3A0.7W200MHz 3DK2B NPN 7 开关30V30mA0.2W 3DK4B NPN 7 开关40V0.8A0.7W 3DK7C NPN 7 开关25V50mA0.3W 3DD15D NPN 12 电源开关300V5A50W 3DD102C NPN 12 电源开关300V5A50W 3522V 5.2V稳压管录像机用 A634 PNP 28E 音频功放开关40V2A10W A708 PNP 6 NF/S 80V0.7A0.8W A715C PNP 29 音频功放开关35V2.5A10W160MHZ A733 PNP 21 通用50V0.1A180MHZ A741 PNP 4