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当前 “线性稳压器/LDO” 共 3129 条相关库存

线性稳压器/LDO

展示方式：

横向纵向

工作温度

+125℃+150℃+150℃(TJ)-10℃~+85℃-20℃~+120℃-20℃~+120℃(TJ)-20℃~+125℃-20℃~+125℃(TJ)-20℃~+150℃-20℃~+60℃-20℃~+70℃-20℃~+85℃-20℃~+85℃(TJ)-25℃~+125℃-25℃~+125℃(TJ)-25℃~+150℃-25℃~+70℃-25℃~+75℃-25℃~+80℃-25℃~+85℃-30℃~+125℃-30℃~+150℃-30℃~+75℃-40℃-40℃~+105℃-40℃~+120℃-40℃~+125℃-40℃~+125℃(TJ)-40℃~+130℃-40℃~+150℃-40℃~+150℃(TJ)-40℃~+85℃-40℃~+85℃(TJ)-45℃~+150℃-45℃~+85℃-55℃~+125℃-55℃~+125℃(TJ)-55℃~+150℃-55℃~+150℃(TJ)0℃~+125℃0℃~+125℃(TJ)0℃~+150℃0℃~+150℃(TJ)0℃~+70℃
清除
安装类型

SMT插件
清除
封装/外壳

D2PAKD2PAK-3D2PAK-5DDPAK3DFN-10-EP(2.6x2.6)DFN-10-EP(3x3)DFN-12-EP(3x3)DFN-12_3X3MM-EPDFN-6(3x3)DFN-8-EP(2x2)DFN-8_3X3MM-EPDFN10_3X3MMDFN12_4X3MM_EPDFN12_4X4MM_EPDFN14_4X3MM_EPDFN16_5X3MM_EPDFN1x1-4LDFN2020-6-EPDFN4L_1X1MMDFN4_1.6X1.2MM_EPDFN4_1X1MMDFN4_1X1MM_EPDFN6_2X2MM_EPDFN6_2X3MM_EPDFN6_3X3MM_EPDFN8_3X2MM_EPDFN8_3X3MM_EPDFN8_4X4MM_EPDFNW10_3X3MMDFNWB-4L(1x1)DPAKDSBGA4D²PAKD²PAK3D²PAK5ESOP-8HRP5_9.4X8MMHSOIC-8_4.9X3.9MM-EPHSOIC8_150MIL_EPHSOP-8_3.9X4.9MM-EPHTSOP-J8_4.9X3.9MM-EPHTSOP8_4.9X3.9MM_EPHTSSOP-20_6.5X4.4MM-EPHTSSOP-24_7.8X4.4MM-EPHTSSOP24_7.8X4.4MM_EPHTSSOP28_9.7X4.4MM_EPHTSSOP28_9.8X4.5MM_EPHVSOF6_3X1.6MM_EPHVSSOP-8HVSSOP-8_3X3MM-EPHVSSOP8_3X3MM_EPLFCSP-10(3x3)LFCSP-6-UD_2X2MMLFCSP-8(3x3)LFCSP-8-EP(3x3)LFCSP-8-WD(3x3)LFCSP10_3X3MM_EPLFCSP16_3X3MM_EPLFCSP16_4X4MM_EPLFCSP6_2X2MM_EPLFCSP8_2X2MM_EPLFCSP8_3X3MM_EPMLF-8_2X2MM-EPMSOP-10-EPMSOP-12_4.039X3MM-EPMSOP-8-EPMSOP10_3X3MM_EPMSOP12_4.04X3MM_EPMSOP12_4X3MM_EPMSOP16_4.04X3MM_EPMSOP8MSOP8_3X3MMMSOP8_3X3MM_EPMSOP8_EPPDIP8_10.16X6.6MMPG-SOT-223PSOP8_5.1X4MM_EPPowerTSSOP8QFN-8_3X3MM-EPQFN16_3X3MM_EPQFN20_3.5X3.5MM_EPQFN28_4X5MM_EPQFN4_1.1X1.1MM_EPQFN8_3.1X3.1MM_EPS-PAK5SC-70-5SC-74ASC70-5SC82ABSCT595-5SMVSO-8SO-8E_4.9X3.9MM-EPSO-8P_6.1214X3.9116MMSO-8_4.9X3.9MMSO-8_4.9X3.9MM-EPSO8_150MIL_EPSO8_3X3MM_EPSOIC-8SOIC-8_4.9X3.9MMSOIC-8_4.9X3.9MM-EPSOIC8N_150MILSOIC8N_150MIL_EPSOIC8_150MIL_EPSOICN8_150MILSON-10-EP(2x2)SON8_3X3MM_EPSOP-8SOP-8_4.902X3.905MM-EPSOP-8_4.9X3.9MM-EPSOP8_EPSOT-223SOT-223-3SOT-223-4SOT-223-4(F)SOT-223-5SOT-223-6SOT-23SOT-23-THINSOT-23ASOT-25SOT-26SOT-553-5SOT-6SOT-89SOT-89-3SOT223SOT223RSOT23-3SOT23-5SOT23-6SOT23ASOT23A-3SOT23A-5SOT25SOT25JSOT353SOT753SOT89-3SOT89-5SSOP5_2.9X1.6MMTDFN-10-EP(3x3)TDFN-8-EP(2x2)TDFN_2X2MM_EPTO-220TO-220-3TO-220-3LTO-220-5TO-220FTO-251-3TO-252(DPAK)TO-252-5TO-252AA(D-PAK)TO-252WTO-261-4TO-263(DDPAK)TO-263-3TO-263-5TO-263-6TO-92TO-92-3TO220TO220-3TO220-7TO220ABTO220FTO220FPTO220ISTO220IS-4TO226-3TO243AATO261-4TO263TO263-2TO263-4TO263-5TO263-6TO263-7TO36-3TO3P-3TQFN16_5X5MMTQFN23_4X4MMTSOP23-5TSOP5TSOT-23-5TSOT-23-8TSOT-5TSOT5TSSOP12TSSOP16TSSOP16_5X4.4MMTSSOP16_5X4.4MM_EPTSSOP8TSSOP8,MSOP8TSSOP8_3X3MM_EPUDFN4_1X1MM_EPUDFN6_2X2MM_EPUFDFN8_3X2MM_EPUSPQ-4B04USPQ4B04-4_1X1MMUTDFN-1x1-4LUTDFN-4-EP(1x1)UTDFN4L_1X1MM_EPUTDFN4_1X1MM_EPVDFN6VDFN6_EPVFDFN10VQFN-20-EP(5x5)VQFN-20_3.5X3.5MM-EPVQFN-20_5X5MM-EPVQFN12VQFN16_3X3MM_EPVQFN20VQFN20_3.5X3.5MM_EPVQFN20_5X5MM_EPVSON-8-EP(3x3)VSON-8_3X3MM-EPVSON10_3.1X3.1MM_EPVSON10_3X3MM_EPVSON8_3.1X3.1MM_EPVSON8_3X3MM_EPVSON8_EPVSSOP8VSSOP8_3X3MMWDFN-10L_3X3MM-EPWDFN6_2X2MM_EPWFDFN10WFDFN10_EPWFDFN12_EPWFDFN8WFQFN20WQFN20_4X4MM_EPWSON-10-EP(3x3)WSON-6-EP(2x2)WSON10_2.5X2.5MM_EPWSON10_3X3MMWSON10_3X3MM_EPWSON6_EPWSON8_EPX2SON-4-EP(1x1)X2SON4_EPXDFN-4-EP(1x1)XDFN4XDFN4_1.05X1.05MM_EPXDFN4_1X1MM_EPXDFN4_EPXDFN8_1.6X1.2MMXFBGA4XFDFN8ZADFN6L_1.2X1.2MM_EPZQFN4L_1X1MM
清除
控制特性

Current Limit,Enable,Soft StartEnable,Power Good,Under Voltage LockoutEnable,good power supply,soft startError Flag,ShutdownShutdown使能使能,复位使能,电源良好使能,电源良好,软启动使能,软启动使能,频率控制,电源良好电源良好软启动过热保护,过流保护限流限流,使能限流,使能,电源良好限流,使能,电源良好,软启动限流,使能,软启动
清除
输出电压

--0.3V~8V-1.22V-1.22V~-20V-1.22V~-27.64V-1.22V~-29.3V-1.22V~-29.5V-1.25V~-5.5V, -2.5V-1.2V-1.2V~-37V-12V-15V-19.5V-30V~0V,1.2V~30V-5V-6V-8V-9V0.3V~6V0.4V0.4V~2.6V0.4V~3.6V0.55V0.55V~5.5V0.5V0.5V~0.9V0.5V~3.4V0.5V~3.8V0.5V~5V0.6V0.6V~5.3V0.75V~3.3V0.79V~1.82V0.8V0.8V~3.6V0.8V~36V0.8V~4.5V0.8V~4.8V0.8V~5.15V0.8V~5.2V0.8V~5.5V0.8V~5.7V0.8V~5V0.8V~6V0.9V0.9V~5.5V0.9V~5V0V0V~-32V0V~15V0V~23V0V~34.5V0V~36V1.15V1.175V~4.5V1.175V~48V1.175V~90V1.18V~33V1.194V1.194V~33V1.19V~5.1V1.1V1.1V~3.5V1.21V1.21V~20V1.225V~25V1.22V1.22V~19.45V1.22V~20V1.22V~5.5V1.22V~60V1.235V1.235V(5V)1.235V~15.3V1.242V~15.65V1.24V1.24V~15V1.24V~17.4V1.24V~22V1.24V~60V1.256V~13.6V1.257V~60V1.25V1.25V~11.75V1.25V~11.7V1.25V~11V1.25V~12V1.25V~13.75V1.25V~13.8V1.25V~16V1.25V~18.8V1.25V~37V1.25V~5V1.25V~6.2V1.25V~6V1.25V~9V1.275V~28V1.275V~60V1.27V1.285V1.2V1.2V~10V1.2V~12V1.2V~15V1.2V~19.5V1.2V~19.8V1.2V~28V1.2V~30V;0V~30V1.2V~32V1.2V~33V1.2V~37V1.2V~5.0V1.2V~5.5V1.2V~50V1.2V~5V1.2V~6.365V1.2V~6.5V1.2V~90V1.3V1.3V~37V1.4V~20.5V1.4V~34V1.5V1.5V~12V1.5V~2.8V1.5V~4.5V1.5V~40V1.5V~5.1V1.5V~5.5V1.5V~5V1.5V~6.5V1.764V~1.836V1.85V1.8V1.8V, 3.3V1.8V,3.3V1.8V,3V1.8V~5.2V1.8V~5V1.9V10V11.5V~12.5V12V15V18V1V1V~3.3V1V~4.5V1V~40V1V~5.5V1V~5V2.1V2.1V~12V2.2V~6V2.3V2.5V2.5V~3.3V2.5V~40V2.5V~5V2.5V~6V2.7V2.7V~20V2.85V2.8V2.9V23V~25V24V2V2V~6V3.2V3.3V3.3V,1.5V~5.5V3.3V,1.8V3.3V,3.3V3.3V,5V3.3V;5V3.3V~12V3.45V3.6V3.75V3.8V3.8V~30V3.9V3V3V~15V3V~35V3V~5.5V3V~5V4.4V4.5V4.75V4.8V~5.2V4.9V400mV~5.5V4V500mV~5.2V5V5V~20V6.5V600mV~39.7V6V800mV800mV~13.6V800mV~3.3V800mV~4.5V800mV~5.15V800mV~5.2V800mV~5V800mV~6V8V900mV9VAdjustable±1.22V~±20V±2.5V
清除
输出配置
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-FixedNegativePositivePositive and Negative正正或负正电压
清除
输出电流
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--200mA0A~3A1.05A1.1A1.2A1.35A1.3A1.4A1.5A100A100mA100mA,50mA,50mA,300mA10mA10mA~3A120mA150mA170mA180mA1A1A,2A1mA2.2A200mA20mA240mA250mA250μA25mA~30mA2A2mA3.5A~5.5A300mA30mA350mA38mA390mA3A4.6A400mA40mA450mA4A500mA500mA,100mA50mA550mA5A5mA600mA60mA7.5A700mA700mA,800mA750mA800mA80mA85mA89mA8mA950mA
清除
静态电流
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--650μA0.1uA1.1mA1.25μA1.27μA1.2mA1.2μA1.3μA1.4mA1.5mA1.5μA1.6mA1.6μA1.7mA1.85μA1.8μA10.1μA100nA100μA105μA10mA10μA110μA115μA11mA120μA125μA12mA130μA135μA13mA140μA150μA155μA15mA15μA160μA170μA175μA180μA18μA1mA1μA2.05μA2.1A2.1mA2.1μA2.2mA2.2μA2.35mA2.4mA2.55μA2.5mA2.5μA2.6μA2.7mA200μA20mA20μA210μA21μA220μA22mA22μA23μA240μA250μA25μA260μA265μA26μA28μA2mA2uA2μA3.1mA3.2mA3.2μA3.3μA3.5mA3.5μA3.8mA3.9mA300nA300μA30μA31μA33μA34μA350μA35μA360μA37μA380μA385μA390μA3mA3μA4.1mA4.2μA4.3mA4.4mA4.5mA4.5μA4.6mA4.7mA400μA40μA42μA45μA46μA4mA4μA5.5mA5.5μA5.9μA50.5μA500nA500μA50μA53μA550μA55μA5A5mA5μA6.1mA6.5mA6.5μA600nA600μA60nA60μA650μA65μA6mA6μA7.5mA7.5μA7.8mA700mA700nA700μA70μA750μA75μA7mA7μA800nA800μA80μA850μA8mA8μA900nA900μA90uA90μA95μA9mA9μA
清除
输出电压精度

-0.03%1%1.5%1.6%2%2.5%3%±0.1%±0.2%±0.5%±0.8%±1%±1.25%±1.5%±1.6%±1.75%±10%±2%±2.5%±3±3%±4%±5%
清除
高度

-0.32mm0.33mm0.35mm0.37mm0.40mm0.43mm0.45mm0.50mm0.53mm0.55mm0.60mm0.63mm0.70mm0.73mm0.75mm0.80mm0.83mm0.85mm0.86mm0.87mm0.88mm0.90mm0.94mm0.95mm0.98mm1.00mm1.02mm1.05mm1.07mm1.09mm1.10mm1.12mm1.14mm1.15mm1.17mm1.20mm1.25mm1.295mm1.30mm1.35mm1.38mm1.40mm1.43mm1.45mm1.50mm1.55mm1.57mm1.60mm1.63mm1.65mm1.70mm1.73mm1.75mm1.80mm1.90mm11.15mm12.70mm12.75mm14.99mm15.00mm15.12mm15.29mm15.34mm15.49mm15.50mm15.75mm16.10mm17.00mm18.95mm19.20mm19.31mm19.55mm19.68mm2.28mm2.29mm2.30mm2.38mm2.39mm2.40mm2.50mm2.52mm2.55mm24.20mm4.38mm4.40mm4.45mm4.50mm4.54mm4.55mm4.57mm4.60mm4.62mm4.65mm4.67mm4.70mm4.82mm4.83mm4.95mm5.33mm5.34mm5.50mm6.10mm8.00mm8.37mm8.52mm8.54mm8.64mm8.70mm8.74mm8.90mm9.15mm9.30mm
清除
电源抑制比(PSRR)

--55dB-65dB-71dB-72dB-75dB@(217Hz)-78dB117dB ~ 53dB（120Hz ~ 10MHz）117dB~53dB(120Hz~10MHz)117dB~56dB(120Hz~10MHz)15dB~40dB25dB@(100KHz)28dB@(100KHz)28dB~108dB33dB34dB35dB35dB@(100Hz)37dB38dB39dB39dB@(120Hz)39dB@(500KHz)39dB（120Hz）40dB40dB@(10KHz)40dB@(1KHz)40dB@(500KHz)40dB~15dB40dB~30dB40dB（1kHz）41dB42dB42dB@(10KHz)42dB~25dB42dB（120Hz）43dB44dB44dB(100Hz)44dB(120Hz)44dB@(100Hz)45dB45dB@(100Hz)45dB@(10KHz)45dB@(1KHz)45dB（120Hz）45dB（1kHz）46dB46dB@(100KHz)46dB（120Hz）47dB48dB48dB@(100Hz)48dB@(120Hz)48dB@(1MHz)48dB~38dB48dB（120Hz）49dB49dB@(120Hz)49dB（120Hz）50dB50dB@(10KHz)50dB@(120Hz)50dB@(1KHz)50dB~30dB50dB（120Hz）52dB52dB(1KHz~1MHz)52dB@(1KHz)53dB53dB~117dB54dB54dB@(1KHz)54dB~43dB54dB（120Hz）55dB55dB(1KHz)55dB@(100Hz)55dB@(10KHz)55dB@(120Hz)55dB@(1KHz)55dB（400Hz）56dB56dB@(100KHz)57dB57dB@(217Hz)57dB~54dB58dB58dB~37dB58dB~48dB58dB（120Hz）59dB59dB~32dB59dB~39dB59dB（120Hz）60dB60dB ~ 15dB（10Hz ~ 1kHz）60dB ~ 15dB（1kHz ~ 100kHz）60dB@(100Hz)60dB@(100Hz,1KHz)60dB@(120Hz)60dB@(1KHz)60dB~20dB60dB~40dB(1KHz~1MHz)60dB~50dB60dB~52dB60dB（100Hz ~ 1kHz）60dB（100kHz）60dB（120Hz）60dB（1kHz）61dB61dB@(120Hz)61dB（120Hz）62dB62dB@(100KHz)62dB@(120Hz)62dB@(1KHz)62dB~55dB62dB（120Hz）63dB63dB(120Hz)63dB@(120Hz)63dB@(1KHz)63dB（120Hz）64dB64dB@(120Hz)64dB@(1KHz)64dB（120Hz）65dB65dB ~ 48dB（1kHz ~ 10kHz）65dB@(100Hz)65dB@(100Hz,1KHz)65dB@(10KHz)65dB@(120Hz)65dB@(1KHz)65dB@(217Hz)65dB~33dB65dB~40dB65dB~40dB(100Hz~1MHz)65dB~48dB65dB~62dB65dB（10kHz）65dB（120Hz）65sB（100Hz ~ 1KHz）66dB66dB~45dB67dB67dB~32dB(100Hz~1MHz)67dB（120Hz）67dB（1kHz）68dB68dB@(120Hz)68dB@(1KHz)68dB~28dB68dB（120Hz）69dB70dB70dB (10KHz)70dB ~ 40dB（1kHz ~ 1MHz）70dB ~ 43dB（100Hz ~ 100kHz）70dB(120Hz)70dB@(100Hz)70dB@(10KHz)70dB@(120Hz)70dB@(1KHz)70dB~30dB70dB~38dB70dB~40dB70dB~43dB70dB~45dB70dB~55dB70dB~56dB70dB（120Hz ~ 1kHz）70dB（120Hz）70dB（1kHz）71dB@(120Hz)72dB72dB@(120Hz)72dB@(1KHz)72dB（120Hz）73dB73dB@(100Hz)73dB@(120Hz)73dB@(1KHz)73dB~42dB73dB（120Hz）74dB74dB（1kHz）75dB75dB ~ 20dB（120Hz ~ 1MHz）75dB(120Hz)75dB@(100Hz)75dB@(10KHz)75dB@(120Hz)75dB@(1KHz)75dB~20dB75dB~55dB75dB~60dB75dB~62dB75dB（10KHz）75dB（120Hz）76dB76dB@(100Hz)76dB（1kHz）77dB77dB（120Hz）78dB78dB~58dB78dB~68dB79dB79dB@(1MHz)80dB80dB ~ 65dB（120Hz）80dB@(100Hz)80dB@(120Hz)80dB@(1KHz)80dB@(217Hz)80dB~40dB80dB~50dB80dB~52dB80dB~65dB80dB（120Hz）82dB82dB@(217Hz)83dB85dB85dB ~ 20dB（120Hz ~ 1MHz）85dB~20dB85dB~65dB85dB（120Hz）87dB87dB ~ 50dB（120Hz ~ 100kHz）87dB~50dB87dB~65dB88dB88dB~50dB90dB90dB ~ 20dB（120Hz ~ 1MHz）90dB~60dB91dB~48dB92dB92dB~62dB(5KHz~100KHz)93dB@(1KHz)96dB@(100Hz)
清除
负荷调节

--185mV0.004%0.05%0.1%0.1mV0.2%0.3%0.3mV0.5%0.6mV0.7mV1.2mV1.5mV100mV10mV110mV11mV12.8mV120mV12mV14mV150mV15mV15mV,-9mV160mV169mV16mV17mV180mV18mV19mV1mV2%2.5mV20mV22mV240mV25mV2mV300mV30mV31mV33mV35mV3mV4.25mV40mV43mV45mV4mV50mV55mV5mV60mV65mV6mV70mV7mV80mV8mV90mV9mV
清除
正向压降VF Max

-1.1V1.25V1.2V1.35V1.3V1.4V1.5V1.6V1.7V1.8V100mV120mV125mV130mV135mV140mV145mV150mV160mV180mV1V200mV212mV220mV230mV235mV238mV240mV244mV250mV265mV280mV290mV2V300mV310mV320mV330mV350mV355mV370mV375mV380mV390mV400mV410mV420mV450mV475mV480mV490mV500mV540mV550mV580mV600mV620mV630mV650mV660mV670mV700mV70mV710mV720mV750mV75mV800mV820mV850mV880mV900mV
清除
输入电压

--1.5V~-36V-1.6V~-20V-1.8V~-30V-1.9V~-20V-15V-2.3V-2.5V~-6.5V-2.7V~-10V-2.7V~-28V-20V-20V~+60V-20V~-7V-24~-11.5V-27V~-14.5V-300mV~16V-300mV~5.9V-30V-30V~-1.8V-32V-36V-36V~-1.5V-4.3V~-20V-40V1.14V~3.5V1.14V~5.5V1.1V~3.5V1.1V~5.5V1.1V~6.5V1.1V~7.5V1.2V~23V1.2V~36V1.2V~37V1.2V~5.5V1.2V~5V1.2V~6V1.425V~6.5V1.45V~5.5V1.4V1.4V~5.5V1.4V~6.5V1.4V~6V1.4V~7.5V1.4V~7V1.5V~12V1.5V~5.5V1.5V~6V1.6V~20V1.6V~45V1.6V~5.5V1.6V~6.5V1.6V~6V1.7V~5.25V1.7V~5.5V1.7V~6V1.7V~7.5V1.8V~10V1.8V~15V1.8V~20V1.8V~36V1.8V~45V1.8V~5.5V1.8V~5V1.8V~6V1.8V~7V1.8V~8V100V10V10V~100V12.5V~25V12V13.2V13.5V13V14.5V~27V14V14V~35V150V15V16V17.5V~30V18V1V~5.5V2.1V~16V2.1V~20V2.1V~5.5V2.25V~16V2.2V~16V2.2V~18V2.2V~40V2.2V~5.5V2.2V~6.5V2.2V~6V2.2V~7V2.375V~5.5V2.38V~3.5V2.3V~24V2.3V~30V2.3V~5.5V2.3V~6.5V2.3V~6V2.45V~15V2.55V~25V2.55V~30V2.5V~12V2.5V~13.2V2.5V~16V2.5V~18V2.5V~20V2.5V~24V2.5V~36V2.5V~40V2.5V~5.5V2.5V~6.5V2.5V~6V2.5V~7V2.6V~24V2.6V~25V2.6V~29V2.6V~6.5V2.75V~18V2.7V~10V2.7V~11.5V2.7V~13.2V2.7V~15V2.7V~16V2.7V~18V2.7V~20V2.7V~30V2.7V~32V2.7V~36V2.7V~40V2.7V~5.5V2.7V~6.5V2.7V~6V2.7V~8V2.8V~5.5V2.8V~60V2.8V~6V2.9V~7V20V22V23V24V25V26.4V26.5V26V27V28V29V2V~10V2V~18V2V~28V2V~45V2V~5.5V2V~6.5V2V~6V2V~7V3.15V~5.5V3.1V~6.5V3.3V3.3V~16V3.3V~18V3.3V~20V3.5V3.5V~15V3.68V~16V3.6V3.6V~24V3.7V~5.5V3.8V~6V30V32V33V35V36V38V3V~16V3V~18V3V~20V3V~35V3V~36V3V~40V3V~50V3V~80V4.15V~30V4.17V~30V4.25V~40V4.2V~40V4.3V~20V4.4V~40V4.5V~40V4.5V~5.5V4.75V~40V4.7V~15V4.8V~20V40V42V45V4V~25V4V~28V4V~40V4V~80V5.2V5.3V~25V5.5V5.5V~40V5.6V5.7V5V5V~30V5V~40V6.25V~26V6.5V60V6V6V~26V7.5V7.5V~20V7V7V~20V7V~25V7V~30V800mV~5.5V80V8V900mV~10V900mV~5.5V950mV~3V9V±2.3V~±20V±33V
清除