三极管大都是塑料封装或金属封装，常见三极管的外观如图，大的很大，小的很小。三极管的电路符号有两种：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。三极管***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β。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β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参数大全MPSA42NPN21E电话视频放大300V0.5A0.625W|MPSA92PNP21E电话视频放大300V0.5A0.625WMPS2222ANPN21高频放大75V0.6A0.625W300MHZ9011NPNEBC高频放大50V30mA0.4W150MHz9012PNP贴片低频放大50V0.5A0.625W9013NPNEBC低频放大50V0.5A0.625W9013NPN贴片低频放大50V0.5A0.625W9014NPNEBC低噪放大50V0.1A0.4W150MHZ9015PNPEBC低噪放大50V0.1A0.4W150MHZ9018NPNEBC高频放大30V50MA0.4W1GHZ8050NPNEBC高频放大40V1.5A1W100MHZ8550PNPEBC高频放大40V1.5A1W100MHZ2N2222NPN4A高频放大60V0.8A0.5W25/200NSβ=452N2222ANPN小铁高频放大75V0.6A0.625W300MHZ2N2369NPN4A开关40V0.5A0.3W800MHZ2N2907NPN4A通用60V0.6A0.4W26/70NSβ=2002N3055NPN12功率放大100V15A115W2N3440NPN6视放开关450V1A1W15MHZ2N3773NPN12音频功放开关160V16A150WCOP2N66092N3904NPN21E通用60V0.2Aβ=100-4002N3906PNP21E通用40V0.2Aβ=100-4002N5401PNP21E视频放大160V0.6A0.625W100MHZ2N5551NPN21E视频放大160V0.6A0.625W100MHZ2N5685NPN12音频功放开关60V50A300W2N6277NPN12功放开关180V50A250W2N6609PNP12音频功放开关160V15A150WCOP2N37732N6678NPN12音频功放开关650V15A175W15MHZ2N6718NPN小铁音频功放开关100V2A2W50MHZ3DA87ANPN6视频放大100V0.1A1W3DG6ANPN6通用15V20mA0.1W100MHz3DG6BNPN6通用20V20mA0.1W150MHz3DG6CNPN6通用20V20mA0.1W250MHz3DG6DNPN6通用30V20mA0.1W150MHz3DG12CNPN7通用45V0.3A0.7W200MHz3DK2BNPN7开关30V30mA0.2W3DK4BNPN7开关40V0.8A0.7W3DK7CNPN7开关25V50mA0.3W3DD15DNPN12电源开关300V5A50W3DD102CNPN12电源开关300V5A50W3522V5.2V稳压管录像机用A634PNP28E音频功放开关40V2A10WA708PNP6NF/S80V0.7A0.8WA715CPNP29音频功放开关35V2.5A10W160MHZA733PNP21通用50V0.1A180MHZA741PNP4A781PNP39B开关20V0.2AA928PNPECB通用20V1A0.25WA933PNP21Uni50V0.1A140MHzA940PNP28音频功放开关150V1.5A25W4MHZ/C2073A950PNP21通用30V0.8A0.6WA966PNP21音频激励输出30V1.5A0.9WCOP:C2236A968PNP28音频功放开关160V1.5A25W100MHZ/C2238|350V2A15WA1012PNP28音频功率放60V5A2A1013PNP21视频放大160V1A0.9WA1015PNP21通用60V0.15A0.4W8MHZA1020PNP21音频开关50V2A0.9WA1123PNP21低噪放大150V0.05A0.75WA1162PNP21d通用贴片50V0.15A0.15WA1216PNPBCE功放开关180V17A200W20MHZ/2922A1220PNP29音频功放开关120V1.5A20W150MHZ/C2690A1265PNPBCE功放开关140V10A100W30MHZ/C3182A1295PNPBCE功放开关230V17A200W30MHZ/C3264A1301PNPBCE功放开关160V10A100W30MHZ/C3280A1302PNPBCE功放开关200V15A150W30MHZ/C3281A1358?PNP高频120V1A10W120MHZA1444PNPBCE高速电源开关100V15A30W80MHZA1494PNPBCE功放开关200V17A200W20MHZ/C3858A1516PNPBCE功放开关180V12A130W25MHZA1668PNP28B电源?00V2A25W20MHZA1785PNPBCE驱动400V1A1W/120V1A0.9W140MH0UzA1941PNPBCE功放开关140V10A100WCOP:5198A1943PNPBCE功放开关230V15A150W/C5200A1988PNP30功放开关B449PNP12功放开关50V3.5A22.5W锗管B631KPNP29音频功放开关120V1A8W130MHZ/D600KB647PNP21通用120V1A0.9W140MHZ/D667B649PNP29视放180V1.5A1W/D669B669PNP28达林顿功放70V4A40WB673PNP28达林顿功放100V7A40WB675PNP28达林顿功放60V7A40WB688PNPBCE音频功放开关120V8A80W/D718B734PNP39B通用60V1A1W/D774B744PNP21通用30V0.1A0.25WB772PNP29音频功放开关40V3A10WB774PNP21通用30V0.1A0.25WB817PNP30功放开关160V12A100W/D1047B834PNP28功放开关60V3A30WB937APNP功放开关60V2A35B1020PNP28功放开关达林顿100V7A40Wβ=6000B1079PNP30达林顿功放100V20A100Wβ=5000/D1559B1185PNP28B功放开关60V3A25W70MHZ/D1762|B1238PNPECB功放开关80V0.7A1W100MHZB1240PNP39B功放开关40V2A1W100HZB1243PNP39B功放开关40V3A1W70HZB1316PNP54B驱动功放达林顿100V2A10Wβ=15000|B1317PNPBCE音频功放180V15A150WCOP1975B1335PNP28音频功放低噪80V4A30W12MHZB1375PNPBCE音频功放60V3A2W9MHZB1400PNP28B达林顿功放120V6A25Wβ=1000-20000B1429PNPBCE功放开关180V15A150WB1494PNPBCE达林顿功放120V25A120Wβ=2000-20000C106NPNEBC音频功放开关60V1.5A15WC380NPN21高频放大35V0.03A250MHZ***58NPN21通用30V0.1A230MHzC536NPN21通用40V0.1A180MHZC752NPN21通用30V0.1A300MHzC815NPN21通用60V0.2A0.25WC828NPN21通用45V0.05A0.25WC900NPN21低噪放大30V0.03A100MHZC943NPN4A通用60V0.2A200MHZC945NPN21通用50V0.1A0.5W250MHZC1008NPN6通用80V0.7A0.8W50MHZC1162NPN29音频功放开关35V1.5A10WC1213NPN39B监视器专用35V0.5A0.4WC1222NPN21低噪放大60V0.1A100MHZC1494?NPN40A发射36V6APQ=40W/175MHZC1507NPN28视放300V0.2A15WC1674NPN21HF/ZF30V0.02A600MHzC1815NPN21通用60V0.15A0.4W8MHZC1855NPN21fHF/ZF20V0.02A550MHzC1875NPN12彩行1500V3.5A50WC1906NPN21高频放大30V0.05A1000MHZC1942NPN12彩行1500V3A50W8F$Y,L0Z@B4PcC1959NPN21通用30V0.4A0.5W300MHzC1970NPN28手机发射40V0.6APQ=1.3W/175MHZC1971NPN28A手机发射35V2.0APQ=7.0W/175MHZC1972NPN28A手机发射35V3.5APQ=15W/175MHZC2012NPN21HF30V0.03A200MHZC2027NPN12行管1500V5A50WC2036C2068NPN28E视频放大300V0.05A1.5W80MHZC2073NPN28功率放大150V1.5A25W4MHZ/A940C2078NPN28音频功放开关80V3A10W150MHZC2120NPN21通用30V0.8A0.6WC2228NPN21视频放大160V0.05A0.75WC2230NPN21视频放大200V0.1A0.8WC2233NPN28音频功放开关200V4A40WC2236NPN21通用30V1.5A0.9W/A966C2238NPN28音频功放开关160V1.5A25W100MHZ/A96850V0.2A0.3W200MHZC2335NPN28视频功放500V7A40WC2373NPN28功放200V7.5A40WC2383NPN21视频开关160V1A0.9W/A1015C2443NPN大铁功放开关600V50A400WC2481NPN29音频功放开关150V1.5A20WC2482NPN21视频放大300V0.1A0.9WC2500NPN21通用30V2A0.9W150MHZC2594NPN29音频功放开关40V5A10WC2611NPN29视频放大300V0.1A1.25WC2625NPN30音频功放开关450V10A80W180V0.1A8WC2688NPN29视放管300V0.2A10W80MHZC2690NPN29音频功放开关120V1.2A20W150MHZ/A1220PC2751NPNBCE电源开关500V15A120Wβ=40C2837NPN30音频功放开关150V10A100WC2898NPN28音频功放开关500V8A50WQC2922NPN43音频功放开关180V17A200W50MHZ/A1216C3026NPN12开关管1700V5A50Wβ=20C3030NPNBCE开关管达林顿900V7A80Wβ=15C3039NPN28电源开关500V7A50Wβ=40C3058NPN12开关管600V30A200Wβ=C3148NPNC2500NPN21通用30V2A0.9W150MHZC2594NPN29音频功放开关40V5A10WC2611NPN29视频放大300V0.1A1.25WC2625NPN30音频功放开关450V10A8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