供应INFINEO三极管BF2040R BB555 1W363 1W362 1W402 1W379

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三极管的基本结构是两个反向连结的PN结面,如图1所示,可有pnp和npn 两种组合。三个接出来的端点依序称为发射极(emitter,E)、基极(base,B)和集电极(collector,C),名称来源和它们在三极管操作时的功能有关。图中也显示出 npn与pnp三极管的电路符号,发射极特别被标出,箭号所指的极为n型半导体, 和二极体的符号一致。在没接外加偏压时,两个pn接面都会形成耗尽区,将中性的p型区和n型区隔开。 pnp和npn三极管的结构及其示意图 三极管的电特性和两个pn结面的偏压有关,工作区间也依偏压方式来分类,这里 我们先讨论最常用的所谓”正向活性区”(forward active),在此区EB极间的pn接 面维持在正向偏压,而BC极间的pn接面则在反向偏压,通常用作放大器的三极管 都以此方式偏压。图2(a)为一pnp三极管在此偏压区的示意图。EB接面的空乏区由于正向偏压会变窄,载体看到的位障变小,射极的空穴会注入到基极,基极的电子也会注入到射极;而BC接面的耗尽区则会变 宽,载体看到的位障变大, 故本身是不导通的。图2(b)画的是没外加偏压,和偏压在正向活性区两种情形下,空穴和电子的电位能的分布图。三极管和两个反向相接的pn二极管有什么差别呢?其间最大的不同部分就在于三极管的两个接面相当接近。以上述之偏压在正向活性区之pnp三极管为例, 射极的空穴注入基极的n型中性区,马上被多数载体电子包围遮蔽,然后朝集电极方向扩散,同时也被电子复合。当没有被复合的空穴到达BC接面的耗尽区时,会被此区内的电场加速扫入集电极,空穴在集电极中为多数载体,很快藉由漂移电流到达连结外部的欧姆接点,形成集电极电流IC。IC的大小和BC间反向偏压的大小 关系不大。基极外部仅需提供与注入空穴复合部分的电子流IBrec,与由基极注入 射极的电子流InBE(这部分是三极管作用不需要的部分)。InB E在射极与与电 洞复合,即InB E=IErec。pnp三极管在正向活性区时主要的电流种类可以清楚地 在图3(a)中看出。 3(a) 射极注入基极的空穴流大小是由EB接面间的正向偏压大小来控制,和二极体的情形类似,在启动电压附近,微小的偏压变化,即可造成很大的注入电流变化。更精确的说,三极管是利用VEB(或VBE)的变化来控制IC,而且提供之IB远比IC小。npn三极管的操作原理和pnp三极管是一样的,只是偏压方向,电流方 向均相反,电子和空穴的角色互易。pnp三极管是利用VEB控制由射极经基极,入射到集电极的空穴,而npn三极管则是利用VBE控制由射极经基极、入射到集电极的电子。三极管在数字电路中的用途其实就是开关,利用电信号使三极管在正向活性区(或饱和区)与截止区间切换,就开关而言,对应开与关的状态,就数字电路而言则代表0与1(或1与0)两个二进位数字。若三极管一直维持偏压在正向活性区,在发射极与基极间微小的电信号(可以是电压或电流)变化,会造成射极与集电极间电流相对上很大的变化,故可用作信号放大器。 LRB551V-30 0215010.MXEP LTST-C150GKT TZY2K450A001ROO PB-5R0V474-R C0805COG202J GR732QR72E333KW01 ACM3225-102-2P-T001 ICVE31186E150R101 SLF12555T-100M3R4 NFM21PC104R1E3D NFM21CC223R1H3D GRM2195C1H103JA01D BLM21AG121SN1D BLM31AF700SN1L NFM21PC105B1A3D MLG0603SR10JT DLP11SN121SL2L DLP11SN900SL2L MEA2010LC220T001 NCMS30C900-TR B39941-B7820-C710 NR3015T4R7M LDB211G9010C-001 NFM51R30P30P307M00-60/T251 LFA20-2A1E473MT LCF20P500-TM PLM250S50T1M00-02 DLW5BSN302Q2L VLCF5020T-470MR40 NFM46P11C155T1M00-03 NFM31SP507X1E4L MFM40P12C223T1M00-54/T251 NFM51R20P207M00-601T251 NFM2012P14C104RT1M00-68 TZW2P450A110T00 IRFR120NTRPBF PI3B3125WEX TC7WH08FU TC7WH14FU SN74CBTLV1G125DBVR IC-PST596JNR RTE002P02 PESD5V0S1UB 1SS361 PTH9C42BD471Q-T NCP21XQ471K03RA LTF1608L-FP2R4H NFM61R30T472T1M00-57/T250 LMNR3015T2R7M LMNR3015T3R3M LMNR3015T4R7M NFM39R12C471T NFM41CC223R2A3L NFM839R02C101R101T1M00-63 NFM3212R13C223RT/M00-67 NCP15XH103F03RC NCP15WF104F03RC LQLB2518T101M NLV25T-R47J-PF LFB312G45SG2A509 LDB15C101A1800F LDB212G4010C-001 LDB15C201A1402F-001/TA15 LDB211G4020C-C003 ERBSE2R50U ERBSE0R50U LDB15C101A1900F-001 LDB15C101A2400F-001 LDB15C101A1800F-001/TA15 NTCG104LH473HT1 NFM2012P13C224RT1M00-68 MEA3216L25R0T002 MEA3216L101RT002 NFM2012P13C102HT/M0074 XP151A13AOMR TPS76333DEBR CVXAEEFE221A9 MZA3216S121AT000 NCP18XH103F03RB YB1508 AO8701 SKY77318-12 B39202-B7825-C710 ICVE21184E070R100FR GRM188-DUMMY-D01D GRM21B5C1H183JA01L LQW31HN47NJ01L MLVS0402M07 AVRC18S05Q007050R ERTJIVR103J NFM2012P13C474RT1M00-68 NFM40R01C101T/M00-54 TACR106M010RTA TACR156M010RTA ICVER101 LDB15C500A1800F NCP15XH103E03RC NCP15WD683J03RC AVNC18S05Q050 ACM2012-201-2P-T000 TR/3216FF-2A TR/3216FF-7A MINISMDC050F ERBSD0R75U HHM1710D1 VSF5R5A400J VSN1005X14NR LDB211G8005C ICVE21184E150R101 TCM2010-201-4P-T ADM809SARTZ ERBSD1R5DV NFM18PC105R0J3D fdg6301n MXD1818UR31+T LMSP43CA-309 LMSP430CA-309 DS290BK-EZ01A XC9223B081AR XC6402CH20DR B39881-87637-L710-A03 XC61CN2002MR XC6411P001MR XC9216A33CMR XC6383C301MR XC62FP3002MR RT9167-33PB RT9193-28PU5 RT9193-33PB XC6209B182MR MA2SD32008S0 SFH942PS101 SFHG42PS101 2SC5383-T111-1F BLM18BD601SN1D BLM18PG300SN1D BLM21B222SDPTM00-0 BLM21AG350SN1D BLM18AG601SN1D BLM18RK102SN1D BLM18AG102SN1D BLM11R121SKPTM MLF1608E8R2KTA00 MLF1608A4R7JT000 CMFB103J3900HANT ELZR391R0N-TK CBL2012T4R7M LFKJELZR391R0N-TK NFM21PC474R1C3D NFM18PS474R0J3D NFA31CC221S1E4D KHC500E226M76N0T00 THCS70E1H226MTF KHC101E475M76R0T00 LQH32CN100K23L LQM18FN1R0M00D LQP11A6N8C00T1M00T1M00-01/T258 LQP18MN6N8C00D LQG18HN5N6S00D LQG18HN10NJ HFM-392PF BLM41P800SPTM00-03 FB MH1608HW471MT FCFBMH1608HW471MT FBMH1608HW471MT CKD510JB1A105ST000N LDC18897M20B-320 LDC21897M19D-0781 LFTC15N19E2450BCA023 LFL151G81TC1B786 LDB15C101A3700F-002 FIG-ODM F950J227MCBAA F950D476MGAAQ2 592D685X9016B2 572D227X0004T2T 594D107X0016D2T F950J107MAAAQ2 F950J226MWCDSTQ2 F951C226MECAQ2 F951A476MTAAQ2 F951A476MBAAF1Q2 F950J107MTAAQ2 F751A337MDC F950J336MPAAQ2 292D106X0010R2T 292D226X96R302T 595D225X0020A2T F951C106MPAAQ2 F951C106MAAAQ2 F951E475MAAAF1Q2 F951D335MAAAF1Q2 F951C226MAAAQ2 F950J336MAAGETQ2 F950J476MAAAQ2 F950G686MAAAF1Q2EA TACL225M010HTA TACL475M006HTA TACL106M6R3RTA TACL226M004RTA NB21N50104JBB ERTJ1VV104H VLF3010AT-100MR49 C5750JB2E105MT0L0U NFA31GD4706R84D TH11-3U334FT LC0406FC05C-T75-2 LC0406FC05C-T75 NFM41R11C223T1M00 NFM18PC104R1C3D DLW5BSN152SQ2L SLF12565-220M3R5-PF RLF7030T-1R5N6R1 SLF12575T-221M1R3 SLF7032T-331MR22-2PF RLF7030T-3R3M4R1 LMNPO5DB4R7M SPM65307-1R0M100A SLF7045T-470MR75-PF SLF10145-470M1R4-PF SLF10165-5R0M5R2 SLF10145-220M1R9-PF SLF7745T-470YR LQH32CM1R0M33L LQH43MN8R2K03L LQH43MN331K03L LQH3KSN222N23L LQH43MN121K03L DIP31DN201ML4L GHM32QR72J223KW01L GR73QR72E333KWO1L CVXAEEGE221AZ LFB2H1G91SG7A198 LFB213G82SG8A199 LFB215G74SG8A200 ISS402 LCA14-2A1A274MT16 LFA24-2A1A473MT LCA14-2A1A473MT KNA16150-W5C MLG0603S56NJT F0603E1R50FSTR MINISMDC014-2 MINISMDC020-2 MINISMDC150F-RA-2 F950J107MECGZTQ2 TZY2K450A001R00 LQLB2012T100MR LMTP50SPRGR AVRC5S05Q100100R B72814R1050S160V7 AVSC5S04F025 ICVE21184E150R500FR MGA-85563-TR1G CSTCW48M0X11K77-R0 CSTCC10M0G56-R0 CSTCR6M00G55-R0 hhm1750a2 SAFEB1G57KEOF20R14 LQW1608A56NJT1M00-01 LQW1608A82NG00T1M00- LQW1608A4N3C00T1M00- LQW1608A6N2D00T1M00- LQW1608A22NG00T1M00- LQW1608A12NG00T1M00 LQW1608A47NJ00T LQW1608A72NG006AS LQW1608A6N8C00T LQW1608AR22G00T1M00- LQW1608A10NG00T1M00- LQW1608A68NJ00D LQW1608A18NJ00T1M00- NFW31SP157X1E4L NFW31SP107X1E4L NFW31SP307X1E4K NFW31SP207X1E4L NFM51R00P506M00-60/T DLP11SN331HL21 BD4734-TR S-80927CLMC-G6X-T2 MAX9119EXK-T MAX6806US26-T XC61CC1602NR VLF3010A-100MR49 LMNR3015T100M MM3241JRRE 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LDC10B150J0836H-323/TA22 LTF1608L-FR2R4H NTH5G1M33B103F04TH XC6411P001NR NFZ31PT222Z1E9L NFM51R00P206M00-60/T251 S-817A30APF-CUTTFG LQH55DN220M03L MEM2012TC470T001 EZAEG2A50AX BD5345G-TR DLM2HGN601SZ3L TR/3216FF2.5-R 以上型号 为现货库存 ,如有需求 请来电
型号/规格

1W397 1W801 LRB521S-30 LRB520S-30 LISS400 LMBT5551 LMBT5401 L8050HQ L8550 HQ(1.5

品牌/商标

LRC

封装形式

SMD

环保类别

无铅环保型

安装方式

贴片式

包装方式

盒带编带包装