一文了解MOSFET分类、工作原理及工作区域

时间： 2024-10-09 来源：方舟微

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一、MOSFET的概念

MOSFET，全称为金属-氧化物-半导体场效应晶体管（Metal-Oxide-Semiconductor Field-Effect Transistor，简称MOSFET），是一种利用电场效应来控制导通和关断的晶体管，广泛应用于电子电路中。

二、MOSFET的分类

MOSFET是一种四端器件，由源极(S)、漏极(D)、栅极(G)和衬底(B)组成。通常，衬底与源极相连，从而简化为三端器件。根据操作类型，MOSFET主要分为增强型和耗尽型两大类。

在材料上，MOSFET分为n沟道和p沟道两种。结合操作类型，我们得到以下四种不同类型的MOSFET：N沟道耗尽型MOSFET、P沟道耗尽型MOSFET、N沟道增强型MOSFET、P沟道增强型MOSFET。

2.1、N沟道MOSFET

N沟道MOSFET称为NMOS，用以下符号表示。

图1. N沟道MOS管符号图

根据MOSFET的内部结构，在耗尽型MOSFET中，栅极（G）、漏极（D）、和源极（S）、引脚是物理连接的，而增强型它们是物理分离的，这就是为什么增强模式MOSFET的符号中间有虚线。

2.2、P 沟道MOSFET

P沟道MOSFET称为PMOS，用以下符号表示。

图2. P沟道MOS管电路符号图

在四种类型的MOSFET中，N沟道增强型MOSFET是最常用的MOSFET。

三、MOSFET的工作原理

通过在栅极施加电压，能够在源极和漏极之间形成一个电场，控制电流的导通与截止。当栅极电压超过某一阈值电压时，MOSFET进入导通状态，允许电流从漏极流向源极；反之，当栅极电压低于阈值电压时，MOSFET截止，阻止电流流动。

图3. MOSFET的结构图

当漏源电压（VDS）为正，且栅极未施加电压时，漏极的PN结处于反向偏置状态，而源极的PN结则处于正向偏置状态。此时，漏极与源极之间无电流流过。

若在栅极施加正电压，P型衬底中的少数载流子（电子）开始被吸引到栅极附近，从而在两个n+区域之间形成导电沟道，即图3中的N型区域。在栅极接触处积累的自由电子的数量取决于施加的正电压的强度。施加的电压越高，由于电子积累而形成的 n 沟道宽度越大，超过阈值电压时将产生漏极电流。

在未对栅极施加电压的情况下，除了由少数载流子引起的微弱电流外，MOSFET中几乎无电流流动。这个使MOSFET开始导通的最小栅极电压被称为阈值电压。

以N沟道增强型MOSFET为例，如下图4所示：

图4. MOS管在增强模式下工作原理图

漏源电压为正，且V_GG处具有大于阈值电压的正电位时，少数载流子即空穴被排斥而多数载流子即电子被吸引向SiO₂层，形成导电沟道，MOSFET被开启，使漏极电流ID从漏极流到源极。当V_GG进一步增加时，导电沟道的宽度变大，电流I_D增加。因此，施加的V_GG越大，漏极电流I_D的值就越大。由于电子流的增加比耗尽模式更好，电流得到增强。因此，这种模式被称为增强模型MOSFET。

四、MOSFET的工作区域

4.1、截止区域

截止区域是将处于关闭状态并且零电流流过它的区域。在这里，该装置起到基本开关的作用，并在需要它们作为电气开关操作时使用。

这里MOSFET的工作条件是：

1、零输入栅极电压 ( V_IN )

2、零漏极电流I_D

3、输出电压V_DS = V_DD。

因此，对于增强型MOSFET，导电通道关闭，器件“关闭”。

4.2、饱和区域

饱和区器件的漏源电流值将不随漏源电压的变化而变化。当漏极到源极端子的电压增加超过夹断电压值时，该器件用作闭合开关，其中饱和电流通过漏极到源极端流动。因此，当器件应该执行切换时选择饱和区域。

4.3、线性/欧姆区域

MOSFET在工作在线性区（也称为欧姆区）时，主要起到类似于可变电阻的作用，电流与漏极-源极电压近似成线性关系。这种特性使其在模拟电路中具有多种重要应用。

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目录- 超结功率MOSFET（SJ MOSFET）金属氧化物半导体场效应管沟槽式金属氧化物半导体场效应管双沟槽金属氧化物半导体场效应管 IGBT 绝缘栅双极型晶体管 IGTO 集成发射极可关断晶闸管 SiC SBD & SiC MOSFET GaN MOSFET 半桥驱动电路

型号- TPD60R1K0C,TMP11N60H,TPA70R1K5M,TCW20N120AD,TMD4N50H,TPV60R350C,TSB15N10A,TPU50R5K0D,TPW60R075C,TMA9N70H,TPR60R580C,TPB70R135MFD,TPW60R160M,TTB95N68A,TPU65R600M,TMP20N40H,TMP12N65H,TMA8N90H,TMJ2N50HF,TMU3N55LT,TTD100N04AT,TPP80R300MFD,TMS05P35H,TPU65R600C,TPW90R350A,TMP30N25H,TCW65R036A,TC21814,TPD65R4K3C,TMP12N65M,TMA12N50HF,TMD5N30H,TMA8N50HFE,TCW65R145A,TMP10N80H,TPP65R380C,TPA60R260MFD,TMW35N60H,TPW55R060D,TPV60R240M,TTD85N03AT,TPA70R600M,TPD5QR690C,TPD50R5K4CT,TPW65R044MFD,TMU6N60H,TPD65R450CFD,TMP12N40H,TPA110R550A,TTU03P06ATS,TPU65R1K5M,TSP180N03A,TPY70R1K5C,TMA9N95H,TPA65R940C,TMA4N100H,TPA65R2K2C,TPA70R1K5C,TMU2N55CT,TMA8N50HF,TMA8N50HE,TTP90N03AT,TMU5N80H,TPP80R750C,TMA8N50HH,TPU73R400M,TMP12N43H,TMA13N65H,TMX05P35H,TTX2305A,TPB60R580C,TPU60R7K5C,TCW12N120AD,TPD65R2K7C,TMA20N60H,TTP115N08A,TPV65R085CFD,TPA65R190MFD,TPU65R1K2C,TPP65R160C,TMW3N150H,TPB65R300MFD,TPW50R060DFD,TMA12N60M,TC2108,TC2106,TPP100R500A,TPU65R950M,TMP20N65H,TC2104,TPD65R280D,TMA4N55LT,TPW100R800A,TMA12N60H,TC2103,TPU70R700C,TMU8N65H,TC2101,TPP70R260M,TMV25N55H,TPV70R190MFD,TPC80R1K2C,TPB65R750C,TPD65R2K6C,TCP3N65A,TPA60R170MFD,TPV70R090M,TMA3N55HT,TPA80R250A,TSG10N06A,TPU55R6K5C,TPA50R700C,TSJ10N06AT,TPA73R300M,TC2117,TC2118,TFA120R800A,TPU50R5K4C,TC2113,TSU10N06A,TMP30N10HT,TTB65N10A,TTJ12N04AT,TC2110,TPA65R170M,TSP12N06A,TPC60R150C,TMA8N70H,TPB50R400C,TTU05P03ATS,TMC6N70H,TMP15P20H,TPP60R260MFD,TSD12N06AT,TMW9N90H,TPP60R600MFD,TMP13N40H,TPW70R120M,TMD7N53HE,TMP1N60C,TMP140N10A,TPP65R360M,TMR12N50H,TTD18P10AT,TPA65R280D,TPV73R300M,TMB160N10A,TMP110N06H,TPW65R100MFD,TTU01P10ATS,TPD55R2K1C,TMD2N70H,TMD3N50H,TSG10N06AT,TMA4N120H,TPU50R360D,TMP12N60H,TPD60R1K4M,TMP12N60M,TMU1N50LT,TMA12N65H,TMA10N80H,TTU08N02ATS,TPA70R950C,TPA70R950M,TMP9N90H,TPA60R330M,TMA12N65M,TMU7N65H,TCP4N65A,TC2136,TPC80R1K5C,TMA11N60H,TMP2N60H,TMA3N120H,TMU4N80H,TPD70R360M,TTG130N03GT,TPU50R250C,TTP70N07A,TPP70R170M,TPV50R060C,TPY70R1K4C,TPB65R1K2C,TPC60R700C,TMU4N40HT,TPA70R1K4C,TMA4N55HT,TMV2N60HF,TPA50R2K3C,TCW50N65A,TPD65R940C,TPG65R365MH,TMV9N90H,TMA13N68H,TPB65R090M,TMU03N60HT,TPD60R840C,TPD65R2K2C,TPU70R2K8C,TTP95N68A,TPP65R600M,TMA4N60H,TMU1N50HT,TPC65R380C,TPD70R1K5M,TMA40N20H,TPD60R1K8C,TMA3N80H,TPP65R070D,TTP100N04AT,TSG010N03AT,TPA100R500A,TTD120N03AT,TPP65R075DFD,TPP65R600C,TMU8N60H,TPC50R690C,TMA4N60N,TMA4N60L,TMA4N60M,TPB80R300CFD,TPP65R950M,TMU08N50HT,TPW60R036M,TTD65N04AT,TMP162N04H,TPP60R2K5C,TPA60R600MFD,TPP70R700C,TPA80R300A,TMU1N50C,TPP80R1K2C,TPA80R300C,TPW80R300C,TPB65R400MFD,TMU1N50H,TMV8N120H,TMD2N50H,TPC70R260M,TMB120N08A,TPA65R520D,TMP120N08A,TPB100R800A,TPP60R700C,TPD70R950M,TMA12N45H,TMA10N60M,TMA10N60N,TMA2N50HF,TMU2N55L,TPD70R950C,TMD2N50CF,TPP65R700MFD,TMA10N60H,TMW6N90H,TMP50N06HT,TPD80R2K2C,TSG10N06ATC,TPP70R190C,TPP80R1K5C,TPW110R800A,TPW5QR065CFD,TPP110R550A,TPA65R9K2C,TMP25N055H,TPP65R1K2C,TMD5N50NF,TTP120N02GT,TMP6N90H,TFU65R280D,TTG40P02ATC,TPD60R1K7C,TMA18N70H,TMA1N60H,TPU65R380C,TPD70R600M,TMP16N25H,TPU80R750C,TTU04N08ATS,TPW70R300MFD,TPA50R500C,TTD28P10AT,TMA11N65H,TMP8N50L,TPA60R1K0C,TMA4N60HF,TPD70R1K5C,TMP8N50H,TMA9N90H,TPV100R500A,TMD8N60H,TCW30N65A,TMP20N60H,TPD65R400MFD,TPU55R2K9C,TMB140N10A,TPC65R360M,TMA3N60H,TMU9N20H,TPU50R1K8C,TPV80R300CFD,TMP38N30HF,TPB70R120M,TPA60R530M,TMP5N100H,TMA5N20H,TPA73R190M,TPR70R120M,TPU60R600MFD,TPV73R190M,TPU60R2K2C,TPC50R250C,TMA25N50C,TTP118N08A,TMU7N60H,TMP3N100H,TMU7N60L,TMU1N50CT,TMY1N60H,TMP1N20H,TSB12N10A,TCP6N65A,TSU12N06A,TMS1N5QLT,TPD55R2K9C,TMA25N50H,TPP60R360MFD,TMC10N65H,TMY1N60B,TPP50R500C,TPB70R400MFD,TPW70R044MFD,TC21844,TMA10N40L,TTD135N68A,TMW9N95H,TPU50R1K6C,TPV65R080C,TTB80N04AT,TSP045N10A,TPU80R1K2C,TMA10N40H,TMD7N60HF,TPP60R190A,TMA85N08H,TMP15N40H,TTK8205,TPB90R350A,TPC60R350C,TMA12N50NF,TPA120R1K5A,TTG65N10A,TTP115N68A,TMA10N65N,TSP12N10AT,TPB70R450C,TPP65R1K5M,TMA10N65H,TC2304,TPU50R1K5C,TMA10N65M,TPC60R240M,TMA18N50H,TPD60R3K4C,TMA2N60C,TMA2N60H,TCW65R275A,TPB65R380C,TPR65R260M,TMU5N50CF,TPA80R1K2C,TPA65R400MFD,TMV28N55H,TPP80R270M,TMW57N10H,TMA16N60H,TMD8N55HE,TPA65R280DFD,TPP60R580C,TTP150N02GT,TMU3N50H,TSP15N06A,TPP120R800A,TMC10N60N,TPW50R065CFD,TPA70R190MFD,TMP6N40H,TTD120N02GT,TMC10N60H,TMU2N70H,TTP120N03AT,TMU6N60HF,TTJ05P04AT,TMP8N25H,TMU2N70L,TMU5N30HT,TPA70R450C,TMA9N20HT,TMP2N50HT,TMU2N70N,TPC65R940C,TCW20N120A,TPB65R100MFD,TMA18N20H,TPU60R3K4C,TMV10N90H,TMU02N15AT,TPA80R300CFD,TSU12N10AT,TPW60R260MFD,TPC70R1K5C,TMA25N55H,TMA4N90H,TPV60R190A,TMU1N55LT,TMW45N50HF,TPA55R2K1C,TPA60R3K4C,TPD50R500C,TCW120R052A,TC2103A,TPC70R950C,TMA3N50LT,TMD8N50H,TPA60R160M,TSG12N06AC,TTP60N10AT,TMA7N55H,TMP7N65M,TPA65R450CFD,TMA5N70H,TPR70R360M,TPA80R1K5C,TSP15N08A,TPU60R1K7C,TMA7N50LF,TPV60R080M,TMD9N20LT,TSG12N06AT,TCW60R320A,TPC70R1K4C,TMU4N55C,TPY70R1K5MB,TPW65R170M,TMA2N120H,TPW110R500A,TMA6N50H,TPU80R1K5C,TMU2N50HT,TMS1N40HT,TMP16N65H,TTP55N12A,TPA80R180M,TPU60R1K8C,TMV20N65H,TSD10N06AT,TPP65R280DFD,TMD7N70H,TPW50R055D,TPD50R700C,TMV3N150H,TMZ1N60B,TMP2N50CT,TPC65R170M,TPW60R120MFD,TPB65R360M,TMW25N50H,TPP50R1K8C,TTG60N03QTC,TPA70R120M,TPP80R300CFD,TM

2020年6月 - 无锡紫光微 - 选型指南 - 第六版代理服务技术支持采购服务

【经验】如何正确选择mosfet场效应晶体管？

近年来，随着汽车、通信、能源、消费、绿色工业等行业广泛使用场效应管产品，功率场效应管备受关注。在未来，场效应晶体管仍将是许多刚进入该领域的工程师会接触到的器件。本文SLKOR将从基础上讨论场效应晶体管的一些基本知识，包括关键常数的选择、介绍、系统和散热考虑等。

2022-01-02 - 设计经验代理服务技术支持采购服务

DMD21R120A 1200V N沟道耗尽型功率MOSFET临时数据手册

描述- 本资料为1200V N-Channel Depletion-Mode Power MOSFET（DMD21R120A）的初步数据手册。资料详细介绍了该MOSFET的电气特性、热特性、开关特性、二极管特性、封装尺寸等，适用于音频放大器、启动电路、保护电路、斜坡发生器、电流稳压器和有源负载等应用。

型号- DMD21R120A

Jun. 2024 - 方舟微 - 数据手册 - Rev. 0.1 代理服务技术支持采购服务

方舟微（ARK）耗尽型MOSFET/增强型MOSFET/电流调节器选型指南

描述- 成都方舟微电子有限公司成立于2008年，是国内唯一专注耗尽型MOSFET设计的公司。专业从事功率器件的研发、制造与销售,并提供电源管理、电路保护解决方案，ARK可根据客户需求,提供高端定制开发。公司专注于技术创新和应用创新，是以应用为导向不断提升技术水平的行业领军者。以市场需求带动创新研发，以技术发展引导应用升级，是ARK一贯宗旨。产品以集成控制的方式提供具有出众的功率处理和电源管理能力，自主研发的耗尽型MOSFET、SiCFET、PHOTOMOS继电器、IC集成功率器件等系列产品大量用于快充、LED、工业控制、电动汽车、通信电路、物联网、光伏、服务器电源和充电桩等领域。

型号- AKP10M60R,DMD4523E,FTP0P1N15G,DMD12C60EA,AKZ35V15R,DMZ32C15EA,DMD02R50A,DMD8515E,DMZ11C60EA,DMX1072,DMZ61C60EA,AKM120N040T4A,DMX4022E,DMZ25R13EA,DMZ12C15A,DJDO1R120A,DMX25R10EA,DMS04R60A,DMZ25R10EA,DMX11C60EA,FTS10N15G,DMZ1511E,DMS6014E,DMS8550E,DMX5530E,FTZ30P35G,DMX42C10A,AKZ25V15R,DMB16C20A,FTS01N15G,FTF15C35G,AKZ16V15R,DMZ85200E,DMS42C10A,DMX22C40A,FTZ15N35G,DMS22C40A,FTE02P15G,DMZ1520E

2024/4/7 - 方舟微 - 选型指南代理服务技术支持采购服务

DMZ8502E 850V N沟道耗尽型功率MOSFET临时数据手册

描述- 本资料为850V N-Channel Depletion-Mode Power MOSFET（DMZ8502E）的初步数据手册。资料详细介绍了该产品的特性、电气特性、热特性、封装尺寸以及应用领域。DMZ8502E是一款高速开关、小封装尺寸的MOSFET，适用于多种电子设备。

型号- DMZ8502E

Feb. 2024 - 方舟微 - 数据手册 - Rev. 0.1 代理服务技术支持采购服务

【选型】安邦（ANBON）MOSFET选型指南

目录- MOSFET特点&电性参数&注意事项 AS MOSFET选型表&封装

型号- AON2405,AS50N03GS,AS3422,AG135N10S,AO3407,AT40N20S,AS2101W,AO3401,AO4612,AS05N15AS,AF4N60S,AO3400,AON6576,SI3457CDV,AO4294,BSS123W,SI2343CDS,AS6005S,AO6808,AD50N03S,AO3414,AD10N10S,SUD50N04-8M8P,AS6385,AP75N65S,AT7N65S,BSS84E,AS3007S,SI4850BDY,SIS903DN,SI2319CDS,AOT4N60,AS7328S,AD24N20S,SI2393DS,AOTF10N60,AS30P15S,AOI4N60,SIHFIBC20G,AD20N06S,AOD66616,AONS66920,AP21N65S,AS2003M,AON6234,SI7139DP,SI7460DP,SUP90330E,SI4559EY,AS3018S,AU4N65S,AS45P02S,AOT2500L,SI3474DV,AD1N60S,AO4842,SI2367DS,AF7N60S,AD50N06S,SI1330EDL,SIHFIBC40GLC,AS30P02S,AS3139E,AS3018E,AT150N06S,SI4925DDY,AD120N06S,IRFRC20,AS6008S,IRFIBC40GLC,AOB1100L,AS53N06S,SI2308CDS,AD90N03S,SIHFZ44R,SIHG64N65E,AS1090E,AS2002E,AS3621,AS80N06S,SIR106DP,AS100N03S,IRFBC30AL,AO4419,AOB290L,AF5N60S,IRFBC30AS,SI4848ADY,SUD19P06-60,AS30N03S,AS4612S,SIHFBC30AS,AS4406S,AOD2916,AOTS21115C,AONS21357,AT17N10S,AS2301,AOD536,AS2302,AOB2904,AS2304,AOD417,AS2300,AS2309,AO6608,AS2305,AONS32304,AOD4N60,AO4421,AS3415FL,SIR182DP,SUP80090E,AS150N06S,SI1317DL,SI4431CDY,AS4407S,AO3451,SUD50P04-09L,AON7292,AS2312,AS3401,AS6005RS,AD4N60S,AS3404,AOD409,AOT412,AOD407,AS2310,SIS402DN,AS3400,AW1N60S,AU4N60S,AS1012ET,AOI296A,AS3407M,AS60N10S,AS2318,AS3407,AS2002ED,AS4953S,AO3420,AO3422,AS90N04S,AD25P06S,AD40N15S,SUP70060E,SIS890DN,AS2324,AT10N65S,AT80N06S,SI4425DDY,AOD516,AOH3106,AO3435,AO4405,SUD35N10-26P,AOD294A,AD80P04S,AG120N08S,AS2002EW,AOT266L,AS2002EU,AS3720S,2N7002E,AS9926,SI2365EDS,AS20N06S,SIS447DN,AD30P03S,AG4N60S,AS3134E,AOTF12N65,AF7N65S,AD15N10S,AO4459,AO4576,SIHF540,AO4407A,AON7400A,AS9435S,AS40P13S,2N7002M,2N7002K,AD60N04S,AOD478,SIRA58DP,AOT7N65,AS3622S,IRF540,AD78N10S,AT140N15S,AOD4184A,AS4666FL,AU78N10S,AO6405,AD80N04S,SIHG28N65EF,AOD296A,AONS66614,AOU4N60,AF20N65S,SI4946CDY,AS3416E,AD50P06S,AF2N60S,AO3494,AO3495,AOT482L,SI2323CDS,AT50P06S,AS3018EW,SUD25N15-52,AS2026EQ,AOSP32314,AS6012S,AD70P04S,AT210N75S,AT95N08S,AF10N60S,IRFIB6N60A,AOTF18N65,2N7002ET,AS3415E,2N7002EU,BSS84,IRFIBC20G,AS4375,AS20N04S,2N7002EW,2N7002ED,AT4N60S,AK4N60S,AO3404A,AS50N03S,AP38N65S,AOD5585,SUD70090E,AS3523L,AON1605,SIHFBC30AL,AS0112S,IRFZ44R,SIHFRC20,2N7002W,AO9926C,AO9926B,AOT2618L,AP210N75S,SI4435DDY,AD80N06S,AS2301M,SIHFIB6N60A,AD30P05S,AS2004EU,AT100N15S,AF4N65S,AOD442,AOT1608L,AS3100,AP65N130R,AS3401L,TP0610K,BSS123,SUD50N06-09L,AO4813,SIHFIBC30G,SIHG22N65E,AO7407,AOB286L,AS4421S,AU6N70S,AOTF7N65,AOSS32136C,AOTF7N60,AS3400FL,AD12P06S,AS4606BS,IRFIBC30G,AT160N08S,AS03N10M,AOB2910L,AS55P05S,BSS138,SI2328DS,AS04N15,AG70N10S,SI2366DS,IRFBC30A,SIHFBC30A,AOT10N65,AON6242,AON6484,AT120N04S,AS4435S,SI4162DY,AG180N10S,SIR186DP,AD40N10S,AOT284L,AW6N10S,SUD19N20-90,SIS406DN,AG160B08S,SI4401FDY,AOT410L,SI4825DDY,AT57N10S,SIHFIBC40G,AF12N65S,AOB284L,IRFIBC40G,SISH402DN,AOD254,AD2N60S,AS6409M,SI4174DY,AF8N60S,AS1003S,AF5N65S,AO4294A,SI2318CDS,AD30N10S,AS70P20S,AT130N10S,SIHG33N65E,AO4803,AS2102W,AS64N03S,AG57N10S,SIHFB9N65A,AS3434E,AS3019ET,AS30P50S,AOD2N60,AO4485,AS18N10S,IRFB9N65A,AT50N06S,SUD23N06-31,AS35N10S,AS8205M

安邦 - 选型指南代理服务技术支持采购服务