磁珠专用于抑制信号线、电源线上的高频噪声和尖峰干扰,还具有吸收静电脉冲的能力。磁珠是用来吸收超高频信号,象一些RF电路,PLL,振荡电路,含超高频存储器电路(DDRSDRAM,RAMBUS等)都需要在电源输入部分加磁珠,而电感是一种蓄能元件,用在LC振荡电路,中低频的滤波电路等,其应用频率范围很少超过50MHZ。 磁珠有很高的电阻率和磁导率,等效于电阻和电感串联,但电阻值和电感值都随频率变化
铁氧体材料的特点是高频损耗非常大,具有很高的导磁率,使电感的线圈绕组之间在高频高阻的情况下产生的电容最校当磁珠中有电流穿过时,铁氧体对低频电流几乎没有什么阻抗,而对较高频率的电流会产生较大的衰减。对于抑制电磁干扰用的铁氧体,最重要的性能参数为磁导率μ和饱和磁通密度Bs。它的等效电路为一个电感和一个电阻串联,两个元件的值都与磁珠的长度成比例。当导线穿过这种铁氧体磁芯时,所构成的电感阻抗是随着频率的升高而增加。高频电流在其中以热量形式散发。
在低频段,阻抗由电感的感抗构成。低频时R很小,磁芯的磁导率较高,因此电感量较大,L起主要作用,电磁干扰被反射而受到抑制,并且这时磁芯的损耗较小.整个器件是一个低损耗,高Q特性的电感。这种电感容易造成谐振.因此在低频段有时可能出现使用铁氧体磁珠后,干扰增强的现象。
在高频段,阻抗由电阻成分构成,随着频率升高,磁芯的磁导率降低,导致电感的电感量减小,感抗成分减校这时磁芯的损耗增加,电阻成分增加,导致总的阻抗增加。当高频信号通过铁氧体时,电磁干扰被吸收并转换成热能的形式耗散掉。
铁氧体磁珠广泛应用于印制电路板,如在印制板的电源线入口端套上磁珠(较大的磁环),就可以滤除高频干扰。铁氧体磁环或磁珠专用于抑制信号线、电源线上的高频干扰和尖峰干扰,它也具有吸收静电放电脉冲干扰的能力。
电感是储能元件,而磁珠是能量转换(消耗)器件。电感多用于电源滤波回路,侧重于抑制传导性干扰;磁珠多用于信号回路,主要用于EMI(电磁兼容)方面。磁珠用来吸收超高频信号,例如在一些RF电路、PLL、振荡电路、含超高频存储器电路等,都需要在电源输入部分加磁珠。
磁珠的单位是欧姆,是按照它在某一频率下产生的阻抗来标称的。磁珠的数据参数表(DATASHEET)上,一般会提供频率和阻抗的特性曲线图,常以100MHz为标准,比如600R@100MHz,意思就是在100MHz频率时磁珠的阻抗相当于600欧姆。
例如某磁珠参数为120Ω,25%,3A,1206,是指在频率1OOMHz时,阻抗值为1200,允许误差是:±25%,允许穿过的标称电流为3A;1206是外形尺寸,EIAl206(英制:英寸)等同于JIS/IEC3216(国际单位制:毫米),即长3.2mm、宽1.6mm。磁环和磁珠对高频成分起吸收作用,也称为吸收滤波器。
普通滤波器由无损耗的电抗元件构成,又叫反射滤波器。当反射滤波器与信号源阻抗不匹配时,就会有一部分能量被反射回信号源,造成干扰电平的增强。为解决这一弊端,可在滤波器的进线上使用铁氧体磁环或磁珠,利用它们对高频信号的涡流损耗,把高频威分转化为热损耗。
磁珠抑制开关噪声属于主动抑制型。通常噪声滤波器只能吸收已发生的噪声,属于被动抑制型。磁珠则能抑制开关噪声的产生,属于主动抑制型。磁珠可广泛用于高频开关电源、录像机、电子测量仪器、以及各种对噪声要求非常严格的电路中。不同的铁氧体抑制元件,有不同的抑制频率范围。
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| TMP87CH74F-6851 |
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| TMP88PU74F |
| TMP87CP74F-1G66 |
| 87CM74F-6683 |
| TMP87CM74F-6683 |
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| MB89184 |
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| MR27V3202F-1AKTNZ03A |
| QXXAVC496---M |
| MR27V3202F-1JBTNZ03A |
| GLT440L16-40TC |
| ND7060-LA |
| 53CF96-2 |
| M38258MCD071-FP |
| KZ4E028613WFP |
| KZ4E028613 |
| SR004A |
| SR008 |
| SPI-12108 |
| SRA-930180C140F001 |
| 930180C140F001 |
| S5D2530B01-M0R0 |
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| SM5845AF |
| SM5845 |
| SM5844AF |
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| 63F9703ESD |
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| 76H6883 |
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| 043641RLAD |
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| 01L5006 |
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| 19G6318ESD |
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| M500000008 |
| M500000000 |
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| PT6312LQ |
| PT86C523-VC-B-DB2CA |
| MSM13R0560-013GS-BK |
| PT86C521-VC-B-DB2CA |
| MSM13R1070-017GS-K |
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| IXA065JB |
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| DN-YC4FS |
| LU552A2P |
| IXA003JB |
| IXA080JB |
| LZ98R11 |
| MC-16340-04 |
| UPD75402AGB-530-3B4 |
| UPD178076GF-E14-3BA |
| UPD78366GF-026-3B9 |
| UPD780078GK-527-9ET |
| UPD72012GB-003-3B4 |
| UPD75304GF-449-3B9 |
| UPD789024GB-A93-8ES |
| UPD789405AGK-A88-8ET |
| UPD780122GB(A)-A03-8ET |
| UPD17078GF-645-3BA |
| UPD780111GB(A)-A04-8ES |
| UPD78033ASGB-X02-8ET |
| UPD789425GK-504-9ET |
| UPD789306GC-A04-A88 |
| UPD78098BGC-518-8BT |
| UPD65664GD-039-5ML |
| UPD65770GD-011-5ML |
| UPD17207GF-591-3B9 |
| UPD65031GF-427-3BA |
| UPD9313AGB-3B4 |
| UPD78044FGF-188-3B9 |
| UPD780208GF-114-3BA |
| UPD78016FGC5637 |
| UPD78013FYGK-M03-8A8 |
| UPD780058GF-171-8BT |
| UPD780058GF-081-3BA |
| UPD78024GF-048-3BA |
| AS336D |
| UPD780204GF-052-3BA |
| UPD789074AGC-078-8BT/JC |
| UPD65445RYGC-J22-9EB |
| UPD432232LGF |
| D65031GF |
| UPD789052MC-105-5A4-A |
| UPD78042FGF-049-3B9 |
| UPD78223GJ |
| UPD78P044GF-3B9 |
| UPD784216AGC-207-8EU |
| UPD780208GF-054 |
| UPD78013F505 |
| UPC662GF |
| APTX179AT |
| C1674 |
| 4922-09L |
| UPC1854ACT/JM |
| UPD75006GB-593-3B4 |
| UPD78044FGF-196-3B9 |
| UPD75P0016GB-HHT50R |
| UPD78F9026A |
| UPD780421GC |
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| UPD16313GB |
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| UPD780058GC-F75-3B9 |
| UPD6382GF-3B9 |
| UPD70208GF--8-3B9 |
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| UPD789322GB-559-8ET-A |
| UPD78044FGF-209-3B9 |
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| UPD78016FGC562 |
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| UPD78044FGF-212-3B9 |
| UPD78042GF-012-3B9 |
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| UPD780033ASGB-X02-8ET |
| UPD78058FGC-A55 |
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| UPD780058GC-144 |
| UPD65834GC-070-7EA |
| UPD780208GF-153-3BA |
| UPD789407AGC-078-8BT/JC |
| UPD703030BYGF-N05 |
| UPD179324GB-504-8ET-A(MS) |
| UPD65204D-057-5BD |
| UPD78054GC-421 |
| UPD72002GC-11 |
| UPD78124GF-507 |
| UPD78058GK-526 |
| UPD78058GC-F93-3B9 |
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| UPD78018FGC-5199 |
| UPD18104GF(A)-534-3BA |
| ES23C64040AL |
| STW5094 |
| RFR6120 |
| SIS313 |
| CX77140-13 |
| XPC7400RX350LK |
| MSM5500 |
| CP90-V2400-7 |
| 04151B |
| TPD11YP1X |
| GS9032 |
| THC63LVD823 |
| XQ11800FP |
| R2S15203FP |
| SED120F |
| 28DS0 |
| 6P4B |
| RRS4002-9916 |
| RRS4003-1006 |
| IDT70V3599S133DR |
| ABB4072B49H06 |
| CM16C450PE |
| PLS11032-60LJ |
| 1032-60LJ |
| T673910 |
| A1010B |
| A276308AL-70 |
| RC9623DP |
| R6642-22 |
| C1997-12 |
| C1997J |
| C1990-12 |
| WD10C00A-JT |
| WD60C31BJM |
| WD60C80JH |
| PM7321-QI |
| LMU18JC |
| RT9600CS |
| RT9243CS |
| RT9226ACS |
| RT9244CS |
| IMP525EMA-T |
| AS7C3256-15JCTR |
| AS2016VT-53 |
| AS2216XN-31 |
| AS2216RN-31 |
| AS7C31024A-10JC |
| AS7C3096A-12JC |
| AS7C34098A-10JC |
| TM9435AS |
| TM6912BFS |
| TM9410S |
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| TM6912S |
| TM3003FD |
| NJM2901V |
| 2901V |
| NJM062MA |
| 062M |
| NJM2535M(TE1) |
| 2535M |
| NJM2903 |
| NJM2391DL1-26(TE1) |
| M34282M1-740GP |
| M34250M2-085FP |
| M34250M2-083FP |
| M34280M1-701FP |
| M5282FP |
| M34280M1-061FP |
| M34280M1-136FP |
| M34280M1-234FP |
| M64072FP |
| M34250M2-091FP |
| M34250M2-092FP |
| RF9906TR13 |
| RF9906 |
| RF9908TR13 |
| RF9908 |
| M34570M4-362FP |
| M61047FP |
| M34282M2-288GP |
| M34280M1-471GP |
| M34280M1-903GP |
| M34280M1-740GP |
| HD74LV574AFP |
| HD74LVC32TELL |
| HD74LVC123AFPEL |
| HAF2017-91STL |
| M34570M4-417FP |
| CA0339M6 |
| HSP9501JC-32 |
| DM74ALS11AMX |
| 74F374SCX |
| 74AC02SCX |
| 74F27SJ |
| 74F174SJ |
| 74VHC138MX |
| 74LCX32MX |
| DS14C232CM |
| 74F379SJ |
| 74VHC04MTCX |
| UPD754302GS-135-E1 |
| 96PLN3-135 |
| UPD6600AGS-J62-T1(MS) |
| D6600A-J62 |
| UPD789102AMC-519-5A4-E1 |
| UPD789112AMC-525-5A4-E1 |
| UPD17226MC-142-5A4-E1 |
| UPD17227MC-151-5A4-E1 |
| UPD17240MC-115-5A4-E1 |
| UPD754302GS-130-E1 |
| 96PLH1-130 |
| UPD17228MC-112-5A4-E1 |
| UPD17228MC-111-5A4-E1 |
| UPD17226MC-204-5A4-E1 |
| UPA1716G-E1 |
| A1716 |
| UPA1715G-E1 |
| A1715 |
| PS2501L-1-E4 |
| UPD754302GS-127-E1 |
| 24CRN2-127 |
| UPD754302GS-122-E1 |
| 96PLN1-122 |
| UPD62MC-725-5A4-E1 |
| UPD62MC-710-5A4-E1 |
| UPD17241MC-130-5A4-E1 |
| UPD75402GS-508-BA5-E2 |
| UPD6133GS-557-T1 |
| UPD6600AGS-J21-T1 |
| UPC842G2-E2 |
| UPC393G2-E1(HS) |
| UPC29M05AT-E1 |
| 2S3518-Z-E1 |
| UPD17137AGT-763 |
| UPD6133GS-480(MS) |
| UPD65MC-727-5A4-E1 |
| 74VHC573MX |
| 74F02SJ |
| 74F381SJ |
| 74F543SJ |
| 74F541SJ |
| 74VHC00MTCX |
| LP2951ACMX |
| LA7158M-TRM |
| LA7158 |
| LA75675M-S-TLM |
| LA75675 |
| LA1137NM-TE-L |
| LA1137N |
| LC7074M-TE-R |
| LC7074M |
| AS321D |
| LM7001JUM-TE-L |
| LM7001J |
| LA6462M |
| LC573104A-1E83 |
| AT93C56-10SI |
| AT93C66PC |
| AT27C020-90JC |
| AT93C46-SI18 |
| AT24C164-SC |
| AT25020P27 |
| AT29C020-90JC |
| AU9254A21-UES |
| HA118121VFP-TR |
| HD74LV74TELL |
| HD74LVU04TELL |
| 16DN045-EL |
| HA17358F-TL |
| 358F |
| HD74HC32FPTR |
| HA17451AFP |
| S03134F-EL |
| HD74HC123AFPTR |
| HD74HC74FPTR |
| BA5937AFP-FE2 |
| BA5937AF |
| BU2481-2N-E2 |
| BU2481-2N |
| BU2483-2Q-T1 |
| BU2483-2Q |
| BU9255FS-E2 |
| 9255FS |
| BU2483-50-TI |
| BU2483-50 |
| BU2483-40-TI |
| BU2483-40 |
| BU2483-46-TI |
| BU2483-46 |
| BU10393F-E2 |
| BU2616F-E2 |
| BU2616F |
| BU9202F-T1 |
| 9202F |
| BA7148F-T1 |
| BA7148F |
| BA4052BCF-T1 |
| BA4052BCF |
| BA7149F-T1 |
| BA7149F |
| BA9204BF-E2 |
| 9204BF |
| BA9204CF-E2 |
| 9204CF |
| BA10339F-E2 |
| BA10339F |
| TMP87CM408M-3N76 |
| TMP87CM408M-3K15 |
| TMP87CM408M-1R85 |
| TA8493AF |
| TC35123F |
| TC7MH374FK |
| TC74LCX00FN |
| TC74HC74AF |
| TC74VHC08FS |
| TC74VHC02FS |
| TC74VHC08FT |
| TC74VHC164FT |
| TC74VHC574FT |
| TC74VHC74FT |
| TC74HC14AF |
| TC74VHC04FS |
| TC74VHC10FS |
| TC74VHC4040FS |
| TC74HC138AF |
| TC74VHC32FT |
| TC74AC00 |
| TC9271FS |
| TC4538BF |
| TC74HC126AF |
| TC74HC00AF |
| TC74VHCU04 |
| TC74HC538AFT |
| TC74AC573FT |
| TC9246F |
| TC74AC32 |
| TC74LVX4053FT |
| MM1234XFBE |
| MM1234 |
| MM1118XFBE |
| MM1292DFBE |
| 292D |
| MAX3206EETC-T |
| SMP11003P |
| SMP-11003P |
| KS51850-M7DSTF |
| KS51850-B2DSTF |
| KS51850-G8DSTF |
| KS51850-19DSTF |
| KS51850-C4DSTF |
| KS51850-B9DSTF |
| KS51850-K7DSTF |
| KS51850-L5DSTF |
| KS51850-F3DSTF |
| KS74HCTLS244CD-TF |
| S3C1850DK7-SKT1 |
| S-29L194AFS-TB |
| CP5565AMT |
| CP5661AMT |
| CP5721AMT |
| CP5592AMT |
| CP5483AMT |
| CP5419BMT |
| CP5151AMT |
| OHS7111P |
| MSC1191MS-K |
| MSM514260C-60JS-7DR1 |
| SN74AC08PWR |
| SN74LV4052ADGVR |
| SN74AC32DR |
| SN74F260DR |
| SN74F38DR |
| SN74LVT245BPWR |
| SN74LVC112ADR |
| SN74HCT244DBR |
| SN74LCVR2245APWR |
| SN74ABT244DBR |
| SN74ABT244APWR |
| SN74F04DBLE |
| LM2901PWR |
| SN74LV574APWR |
| SN75157PSR |
| SN74HC541NS-TR |
| SN74LC74A |
| SM5841BS-ET |
| SM5840ES-ET |
| NS953B1BP32-01-EF-E1 |
| MB3759PF-G-BND-JN-EF |
| BQ2201PN |
| TSS1G45S |
| BD9701FP-E2 |
| PT29C010P-90 |
| PT29C020P-90 |
| PT28C040P-90 |
| PT29C040-70 |
| PT2256 |
| SLC-06MC |
| PT2282P |
| PT2283P |
| PT7025 |
| PT7822 |
| PT6320 |
| T702 |
| PT3702 |
| PT6355 |
| PT6552LQ |
| PT6607 |
| PT3800LQ |
| PT6522LQ |
| PZ0263 |
| PT6311-LQ |
| RX3361E0A-R-016SAA |
| PT6312 |
| PT6314-002 |
| PT6596 |
| PT6351 |
| PT6553LQ |
| PT6810-LQ |
| PT6608 |
| PT6807-TQ |
| PT2272-M5S |
| PT2272-L6S |
| PT2272-M3S |
| FS8160 |
| FS8107 |
| 10-53164 |
| PT0249-S58 |
| PT2307 |
| PT6302-R-002 |
| PT6964-S |
| JT-7060-31 |
| PT2282-S |
| SLC-05MC |
| PT6958 |
| PT6957 |
| PT6313-S |
| PT6958-FN |
| PT7954 |
| PT6999 |
| PT2270-L4S |
| PT6963-S |
| PT2272-M5 |
| PT2282P-16S |
| SMS2283-S |
| PT2259 |
| PT2248-S |
| JT-7025-21 |
| JT-7088-3 |
| JT-7054-3 |
| PT6302-R-006 |
| PT2275 |
| PT2282 |
| PT2300 |
| PT2283P-S |
| PT2270-M6S |
| PT2259C-S |
| B800-1 |
| JT-7060-22 |
| PT7386 |
| PT7558 |
| PT2268P8-2 |
| PT2309-S |
| HK1000 |
| JT-7033-18 |
| JT-7041-1 |
| JT-7051C-18 |
| AS2K018 |
| PT2272-S |
| PT2283LP-S |
| PT2270-M4S |
| PT2272-L3S |
| PT2282P-S |
| RX3361 |
| PT6302LQ-007 |
| PT7117 |
| R2S15900 |
| PT7558A |
| RDS035L03 |
| BA6909F-E2 |
| FY4AEJ-03-T13 |
| M63154FP |
| M52479FP |
| NBC3108M-TE-L |
| PMB5612RV1.1 |
| PMB4819RV1.1EGE |
| 3040L0ZB00 |
| 3040L0ZB01 |
| M36W0R604 |
| LRS18BL |
| 74HCT32PW |
| 74HCT373DB |
| 74AHCT373PW |
| 74AHCT04PW |
| 74HCT175PW |
| 74AHCT74PW |
| 74LVT08PW |
| 74HCT03D |
| 74HCT153D |
| 74LVC08ADB |
| 74LV03D |
| 74HCT86PW |
| N74F374D |
| 74LVC74AD |
| 74LVC10AD |
| 74AHCU04D |
| 74AHCT244D |
| CGY2030M/C1 |
| 74HC123DB |
| 74AHC132D |
| 74HCT573DB |
| 74AHC132PW |
| 74HCT164PW |
| N74F125D |
| 74HCT273PW |
| 74HC04PW |
| 74HC165PW |
| 74LVC02APW |
| 74AHCT04D |
| 74HCT08PW |
| 74HCT193D |
| 74AHC08PW |
| 74LVC541D |
| 74HCT161D |
| 74HCT244D |
| PCA9555 |
| 74HCT2G126DP |
| 74AHCT1G08GW |
| 74AHC1G125GW |
| 74HC1G04GW |
| 74AHCT1G04GW |
| 74AHC1G00GW |
| 74HC3G14DP |
| ML6427CS |
| SC5217710FBER |
| MC14001BF-EL |
| MC79M05CDTRK |
| SC528330VFN2R2A |
| MC74HC245AFR1 |
| MC74HC4066FR1 |
| MC74F74MR1 |
| MC74VHC157MEL |
| QMC74HC4053FP |
| M34580M4-500FP |
| M35263MJ-253GP |
| M5233FP |
| M34280M1-471FP |
| M64021FP |
| M34250M2-106FP |
| M34263MJ-231GP |
| M34280M1-356FP |
| M34570M4-050FP |
| M34570M4-083FP |
| M34570M4-318FP |
| M34230M4-208FP |
| M34238MK-283GP |
| 1819-0078 |
| MX23L3211MC-10 |
| FBE528 |
| 0050-8115A |
| 74LVX125TTR |
| 74ACT74TTR |
| ST232CDR |
| L9820D013TR |
| PHY51264BJC60 |
| TQ9147B |
| CXD2412AQ-TL |
| CXK1206ATM |
| AK4563AVF-E1 |
| AK93C65F-E1 |
| SI9958DY-T1 |
| P310 |
| MG-5100SA |
| CAK914M915200AT |
| PQ1K253M2ZP |
| S-24C08AFJA-TB-01 |
| PQ20VZ1U |
| CX-5F |
| 44336 |
| G960T43 |
| PQ050DZ01ZP |
| B962 |
| 341S0055 |
| S-93C56AFJ-TB-K1 |
| S-93C56ADFJ |
| KCX41715M5 |
| MINI USB-B/F/SMT |
| USB-B/F/SMT |
| LT406 |
| STK6006-F3 |
| M8064I-3 |
| TDA7088T |
| TEA1096AT |
| PC84C122AT-003 |
| M34570M4-060FP |
| M34570M4-204FP |
| M34282M1-681GP |
| GD75189AD |
| GD4053B |
| GD4053BD |
| GD75188 |
| S02303A |
| S01445 |
| S01820A |
| AKKU2110BX |
| S86PA-F |
| ICS94228BF |
| UA931773 |
| SC34321CM |
| IDT7201LA12J |
| 7201LA12J |
| S-8233ACFE |
| S-8233AGFE-TB |
| BQ2092SN |
| 74F08PC |
| TC74HC368AP |
| LA1130 |
| LA7520 |
| LC4069UB |
| LC3517BL-15 |
| LC7218 |
| LC72720 |
| LA1266 |
| LA3410 |
| LA2200 |
| LA2220 |
| LC26023A-NA5E |
| LC26023A-NA5E-E |
| LA7765 |
| LA7945N |
| GPCT38307FM15 |
| MC33074D |
| MCM68B618FN9 |
| XC68340RP16/1D75M |
| XCD211FU |
| MC14070B |
| MC10125P |
| MC14412VP |
| 04M43 |
| SC82423CPDS |
| 51R83222M63 |
| 22M63 |
| N8281N |
| S0C536A |
| MC44131P |
| MC14066B |
| MC74F08 |
| 29M55 |
| GD4050B |
| Z8430APS |
| GD4013B |
| KID65004AP |
| KID65503P |
| KIC3502 |
| MSM5142256BP-10ZS |
| MSM514212-34 |
| MSM518222A-30Z |
| S5D2510XD3-D0 |
| KM428C128J-6 |
| KM62256BLG-10 |
| KM44C256AP-10 |
| KM641005P-25 |
| KM428C256J-7 |
| KM428C128J-8 |
| KM681000BLG-7 |
| K6T1000C2E-GB70 |
| KM64258BP-25 |
| KM68512LG-7 |
| KM6865BP-20 |
| KM68257BP-25 |
| KM75C03AJ-20 |
| KM75C03AN-20 |
| KS53C80-3CP |
| KMM536512A-8 |
| KA8601C |
| KM56C401-64 |
| KM82C55A-8CP |
| LM339 |
| KT8555J |
| KS0604 |
| KA7302D |
| KA9256 |
| KM424C257Z-8 |
| KM424C257ZJ-8 |
| KM424C64Z-10 |
| CXP85116-509S |
| CX20026 |
| CXP85232A-102S |
| L9820 |
| STV3200CP |
| STV3208CP |
| TL062C |
| TEA6420 |
| M27C4001-12F6 |
| LT6031 |
| TFIR6400A |
价格优惠 欢迎来电垂询 0755-83041767 83372015 82716726 13510940754 柯小姐
险丝(fuse)也被称为电流保险丝,IEC127标准将它定义为"熔断体(fuse-link)"。由电阻率比较大而熔点较低的银铜合金制成的导线叫做保险丝。最初用铅锑合金做的保险丝已因安全原因被淘汰。当电路发生故障或异常时,伴随着电流不断升高,并且升高的电流有可能损坏电路中的某些重要器件或贵重器件,也有可能烧毁电路甚至造成火灾。若电路中正确地安置了保险丝,那么,保险丝就会在电流异常升高到一定的高度和热度的时候,自身熔断切断电流,从而起到保护电路安全运行的作用。 LBL-9652 WFD163MT64T TDA3D5WT$ID NMP4370717 4370717 TZC5HRTT NMP70849 4370849 STTZA8IEGT TZA8IEGT$GB NMP70731 4370731 ...
场效应晶体管(Field Effect Transistor缩写(FET))简称场效应管。由多数载流子参与导电,也称为单极型晶体管。它属于电压控制型半导体器件。具有输入电阻高(10^8~10^9Ω)、噪声小、功耗低、动态范围大、易于集成、没有二次击穿现象、安全工作区域宽等优点,现已成为双极型晶体管和功率晶体管的强大竞争者 各类场效应管根据其沟道所采用的半导体材料,可分为N型沟道和P型沟道两种。所谓沟道,就是电流通道。 半导体的场效应,是在半导体表面的垂直方向上加一电场时,电子和空穴在表面电场作用下发生运动,半导体表面载流子的重新分布,因而半导体表面的导电能力受到电场的作用而改变,即改变为加电压的大小和方向,可以控制半导体表面层中多数载流子的浓度和类型,或控制PN结空间电荷区的宽度,这种现象称半导体的场效应。 场效应管属于电压控制元件,这一点类似于电子管的三极管,但它的构造与工作原理和电子管是截然不同的,与双极型晶体管相比,场效应晶体管具有如下特点: (1)输入阻抗高; (2)输入功耗小; (3)温度稳定性好; (4)信号放大稳定性好,信号失真小; (5)由于不存在杂乱运动的少子扩散引起的散粒噪声,所以噪声低。 根...