Alternates
    Please enter a valid full or partial manufacturer part number with a minimum of 3 letters or numbers

    ILD620 Search Results

    ILD620 FFF Equivalents (5)

    The Form Fit Function (FFF) results will give you the options that are more likely to serve as direct pin-to-pin alternates or drop-in parts.

    Always verify details of parts you are evaluating, as these parts are offered as suggestions for what you are looking for and are not guaranteed.

    Part Number Manufacturer Composite Price Description
    LTV-827 Lite-On Semiconductor Corporation $0.1534 Transistor Output Optocoupler, 2-Element, 5000V Isolation
    ILD620 Vishay Intertechnologies $0.9940 AC Input-Transistor Output Optocoupler, 2-Element, 5300V Isolation
    LTV827A Lite-On Semiconductor Corporation Check for Price 2 CHANNEL TRANSISTOR OUTPUT OPTOCOUPLER, DIP-8
    LTV827B Lite-On Semiconductor Corporation Check for Price 2 CHANNEL TRANSISTOR OUTPUT OPTOCOUPLER, ROHS COMPLIANT, DIP-8
    LTV827 Lite-On Semiconductor Corporation Check for Price 2 CHANNEL TRANSISTOR OUTPUT OPTOCOUPLER, ROHS COMPLIANT, DIP-8

    ILD620 Functional Equivalents (5)

    The Functional Equivalents tab will give you options that are likely to match the same function of ILD620, but it may not fit your design.

    Always verify details of parts you are evaluating, as these parts are offered as suggestions for what you are looking for and are not guaranteed.

    Part Number Manufacturer Composite Price Description
    TLP621-2 Isocom Components $0.2081 Transistor Output Optocoupler, 2-Element, 5300V Isolation
    TLP521-2 Isocom Components $0.3845 Transistor Output Optocoupler, 2-Element, 5300V Isolation, DIP-8
    ILD620 Telefunken Microelectronics Gmbh Check for Price Transistor Output Optocoupler, 2-Element, 5300V Isolation
    ILD620 Infineon Technologies AG Check for Price AC Input-Transistor Output Optocoupler, 2-Element, 5300V Isolation
    PC826 Sharp Corp Check for Price Transistor Output Optocoupler, 2-Element, 5000V Isolation

    ILD620 Datasheets (19)

    Select Manufacturer
    Part ECAD Model Manufacturer Description Datasheet Type PDF PDF Size Page count
    ILD620
    Infineon Technologies Optocoupler, 8 Pin Quad, 50-600% CTR, AC, Bidirectional Original PDF 421.71KB 4
    ILD620
    NEC Optocoupler & Solid State Relay Cross Reference Guide Original PDF 76.32KB 40
    ILD620
    Siemens AC INPUT PHOTOTRANSISTOR OPTOCOUPLER Original PDF 78.65KB 4
    ILD620
    Vishay Intertechnology AC Input Phototransistor Optocoupler Original PDF 408.6KB 4
    ILD620
    Vishay Siliconix Optocouplers Original PDF 174.78KB 9
    ILD6201
    Infineon Technologies DUAL CHANNEL AC Input Phototransistor Optocoupler Original PDF 421.69KB 4
    ILD620B
    Siemens AC INPUT PHOTOTRANSISTOR OPTOCOUPLER Original PDF 78.65KB 4
    ILD620GB
    Infineon Technologies Optocoupler, 8 Pin Quad, 100-600% CTR, AC, Bidirectional Original PDF 421.71KB 4
    ILD620GB
    NEC Optocoupler & Solid State Relay Cross Reference Guide Original PDF 76.32KB 40
    ILD620GB
    Siemens AC INPUT PHOTOTRANSISTOR OPTOCOUPLER Original PDF 78.64KB 4
    ILD620GB
    Vishay Intertechnology AC Input Phototransistor Optocoupler Original PDF 408.6KB 4
    ILD620GB
    Vishay Siliconix Optocouplers Original PDF 174.78KB 9
    ILD620GB1
    Infineon Technologies DUAL CHANNEL AC Input Phototransistor Optocoupler Original PDF 421.69KB 4
    ILD620GB-X009
    Vishay Siliconix Optocouplers Original PDF 174.78KB 9
    ILD620GB-X009T
    Vishay Semiconductors Optoisolators - Transistor, Photovoltaic Output, Isolators, OPTOISO 5.3KV 2CH TRANS 8SMD Original PDF 9
    ILD620-X007
    Vishay Siliconix Optocouplers Original PDF 174.78KB 9
    ILD620-X007T
    Vishay Semiconductors Optoisolators - Transistor, Photovoltaic Output, Isolators, OPTOISO 5.3KV 2CH TRANS 8SMD Original PDF 9
    ILD620-X009
    Vishay Siliconix Optocouplers Original PDF 174.78KB 9
    ILD620-X009T
    Vishay Semiconductors Optoisolators - Transistor, Photovoltaic Output, Isolators, OPTOISO 5.3KV 2CH TRANS 8SMD Original PDF 9
    SF Impression Pixel

    ILD620 Price and Stock

    Select Manufacturer

    Vishay Intertechnologies ILD620

    OPTOCOUPLER, PHOTOTRANSISTOR, 5300VRMS; No. of Channels:2 Channel; Optocoupler Case Style:DIP; No. of Pins:8Pins; Forward Current If Max:60mA; Isolation Voltage:5.3kV; CTR Min:50%; Collector Emitter Voltage V(br)ceo:70V RoHS Compliant: Yes
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Newark ILD620 Bulk 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $1.30
    Buy Now
    ComSIT USA ILD620 2,680
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote

    Vishay Intertechnologies ILD620GB

    OPTOCOUPLER, PHOTOTRANSISTOR, 5300VRMS; No. of Channels:2 Channel; Optocoupler Case Style:DIP; No. of Pins:8Pins; Forward Current If Max:60mA; Isolation Voltage:5.3kV; CTR Min:100%; Collector Emitter Voltage V(br)ceo:70V RoHS Compliant: Yes
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Newark ILD620GB Bulk 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Quest Components ILD620GB 4,948
    • 1 $1.73
    • 10 $1.73
    • 100 $1.73
    • 1000 $0.79
    • 10000 $0.72
    Buy Now

    Siemens ILD620

    Optocoupler AC-IN 2-CH Transistor DC-OUT 8-Pin PDIP
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Bristol Electronics ILD620 1,000 1
    • 1 $1.85
    • 10 $1.39
    • 100 $1.15
    • 1000 $0.61
    • 10000 $0.61
    Buy Now
    Quest Components () ILD620 800
    • 1 $2.43
    • 10 $2.43
    • 100 $2.43
    • 1000 $1.00
    • 10000 $1.00
    Buy Now
    ILD620 800
    • 1 $2.46
    • 10 $2.46
    • 100 $2.46
    • 1000 $0.77
    • 10000 $0.77
    Buy Now
    ILD620 150
    • 1 $1.52
    • 10 $1.52
    • 100 $0.91
    • 1000 $0.91
    • 10000 $0.91
    Buy Now
    ILD620 31
    • 1 $2.43
    • 10 $1.82
    • 100 $1.52
    • 1000 $1.52
    • 10000 $1.52
    Buy Now

    Vishay Semiconductors ILD620GB

    NPN-OUTPUT AC-INPUT OPTOCOUPLER,2-CHANNEL,4.4KV ISOLATION,DIP
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Quest Components ILD620GB 10,936
    • 1 $1.73
    • 10 $1.73
    • 100 $1.73
    • 1000 $0.79
    • 10000 $0.72
    Buy Now

    Siemens ILD620-X009

    NPN-OUTPUT AC-INPUT OPTOCOUPLER,2-CHANNEL,5.3KV ISOLATION,SO
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Quest Components ILD620-X009 310
    • 1 $6.00
    • 10 $6.00
    • 100 $2.60
    • 1000 $2.40
    • 10000 $2.40
    Buy Now

    ILD620 Datasheets Context Search

    Catalog Datasheet Type Document Tags PDF

    600 optocoupler

    Abstract: tlp620 optocoupler
    Contextual Info: ILD620, ILD620GB, ILQ620, ILQ620GB Vishay Semiconductors Optocoupler, Phototransistor Output, AC Input Dual, Quad Channel A/C 1 8 C A/C 2 7 E A/C 3 6 C A/C 4 5 E FEATURES • Identical channel to channel footprint Dual Channel • ILD620 crosses to TLP620-2


    Original
    ILD620, ILD620GB, ILQ620, ILQ620GB ILD620 TLP620-2 ILQ620 TLP620-4 2002/95/EC 2002/96/EC 600 optocoupler tlp620 optocoupler PDF

    Contextual Info: ILD620, ILD620GB, ILQ620, ILQ620GB www.vishay.com Vishay Semiconductors Optocoupler, Phototransistor Output, AC Input Dual, Quad Channel A/C Dual Channel Quad Channel 1 8 C FEATURES A/C 2 7 E • Identical channel to channel footprint A/C 3 6 C • ILD620 crosses to TLP620-2


    Original
    ILD620, ILD620GB, ILQ620, ILQ620GB ILD620 TLP620-2 ILQ620 TLP620-4 11-Mar-11 PDF

    QUAD Phototransistor Optocouplers

    Abstract: TLP620 ILD620 ILQ620 TLP620-2 TLP620-4 TLP620-4 optocoupler
    Contextual Info: ILD620/620GB QUAD CHANNEL ILQ620/620GB DUAL CHANNEL AC INPUT PHOTOTRANSISTOR OPTOCOUPLER FEATURES • Identical Channel to Channel Footprint ILD620 Crosses to TLP620-2 ILQ620 Crosses to TLP620-4 • Current Transfer Ratio CTR at IF= ± 5 mA ILD/Q620: 50% Min.


    Original
    ILD620/620GB ILQ620/620GB ILD620 TLP620-2 ILQ620 TLP620-4 ILD/Q620: ILD/Q620GB: QUAD Phototransistor Optocouplers TLP620 TLP620-2 TLP620-4 TLP620-4 optocoupler PDF

    Contextual Info: ILD620, ILD620GB, ILQ620, ILQ620GB www.vishay.com Vishay Semiconductors Optocoupler, Phototransistor Output, AC Input Dual, Quad Channel A/C Dual Channel Quad Channel 1 8 C FEATURES A/C 2 7 E • Identical channel to channel footprint A/C 3 6 C • ILD620 crosses to TLP620-2


    Original
    ILD620, ILD620GB, ILQ620, ILQ620GB ILD620 TLP620-2 ILQ620 TLP620-4 2011/65/EU 2002/95/EC. PDF

    ILQ620-X009

    Abstract: ILD620 ILQ620 TLP620-2 TLP620-4
    Contextual Info: ILD620/ 620GB / ILQ620/ 620GB Vishay Semiconductors Optocoupler, Phototransistor Output, AC Input Dual, Quad Channel Features • • • • • Identical Channel to Channel Footprint ILD620 Crosses to TLP620-2 ILQ620 Crosses to TLP620-4 High Collector-Emitter Voltage, BVCEO = 70 V


    Original
    ILD620/ 620GB ILQ620/ 620GB ILD620 TLP620-2 ILQ620 TLP620-4 2002/95/EC 2002/96/EC ILQ620-X009 TLP620-2 TLP620-4 PDF

    ILD620

    Abstract: ILD620GB ILQ620 ILQ620GB TLP620-2 TLP620-4 smd 4-pin package DUAL DIODE smd 4-pin DUAL DIODE Optocoupler 16 Pin quad sop ILQ620x001
    Contextual Info: ILD620, ILD620GB, ILQ620, ILQ620GB www.vishay.com Vishay Semiconductors Optocoupler, Phototransistor Output, AC Input Dual, Quad Channel A/C Dual Channel Quad Channel 1 8 C FEATURES A/C 2 7 E • Identical channel to channel footprint A/C 3 6 C • ILD620 crosses to TLP620-2


    Original
    ILD620, ILD620GB, ILQ620, ILQ620GB ILD620 TLP620-2 ILQ620 TLP620-4 11-Mar-11 ILD620GB ILQ620GB TLP620-2 TLP620-4 smd 4-pin package DUAL DIODE smd 4-pin DUAL DIODE Optocoupler 16 Pin quad sop ILQ620x001 PDF

    ILQ620

    Abstract: IEC60965 ILD620 TLP620-2 TLP620-4 VDE0884
    Contextual Info: VISHAY ILD620/ 620GB / ILQ620/ 620GB Vishay Semiconductors Optocoupler, Phototransistor Output, AC Input Dual, Quad Channel Features • • • • • Identical Channel to Channel Footprint ILD620 Crosses to TLP620-2 ILQ620 Crosses to TLP620-4 High Collector-Emitter Voltage, BVCEO = 70 V


    Original
    ILD620/ 620GB ILQ620/ 620GB ILD620 TLP620-2 ILQ620 TLP620-4 E52744 VDE0884) IEC60965 TLP620-2 TLP620-4 VDE0884 PDF

    ILD620

    Abstract: ILQ620 TLP620-2 TLP620-4 Q620
    Contextual Info: ILD620/620GB QUAD CHANNEL ILQ620/620GB DUAL CHANNEL AC Input Phototransistor Optocoupler FEATURES • Identical Channel to Channel Footprint ILD620 Crosses to TLP620-2 ILQ620 Crosses to TLP620-4 • Current Transfer Ratio CTR at IF= ±5 mA ILD/Q620: 50% Min.


    Original
    ILD620/620GB ILQ620/620GB ILD620 TLP620-2 ILQ620 TLP620-4 ILD/Q620: ILD/Q620GB: TLP620-2 TLP620-4 Q620 PDF

    Contextual Info: ILD620/620GB QUAD CHANNEL ILQ620/620GB SIEMENS DUAL CHANNEL AC INPUT PHOTOTRANSISTOR OPTOCOUPLER FEATURES Package Dimensions in Inches mm • Identical Channel to Channel Footprint ILD620 Crosses to TLP620-2 ILQ620 Crosses to TLP620-4 • Current Transfer Ratio (CTR) at lF= ±5 mA


    OCR Scan
    ILD620 TLP620-2 ILQ620 TLP620-4 ILD/Q620: ILD/Q620GB: E52744 ILD620/620GB PDF

    ILQ620-X009

    Abstract: ILD620 ILQ620 TLP620-2 TLP620-4
    Contextual Info: ILD620/ 620GB / ILQ620/ 620GB Vishay Semiconductors Optocoupler, Phototransistor Output, AC Input Dual, Quad Channel Features • • • • • Identical Channel to Channel Footprint ILD620 Crosses to TLP620-2 ILQ620 Crosses to TLP620-4 High Collector-Emitter Voltage, BVCEO = 70 V


    Original
    ILD620/ 620GB ILQ620/ 620GB ILD620 TLP620-2 ILQ620 TLP620-4 2002/95/EC 2002/96/EC ILQ620-X009 TLP620-2 TLP620-4 PDF

    TLP620-2

    Abstract: TLP620-4 ILQ620 ILD620 2201 opto
    Contextual Info: ILD620/620GB QUAD CHANNEL ILQ620/620GB DUAL CHANNEL AC Input Phototransistor Optocoupler FEATURES • Identical Channel to Channel Footprint ILD620 Crosses to TLP620-2 ILQ620 Crosses to TLP620-4 • Current Transfer Ratio CTR at IF= ±5.0 mA ILD/Q620: 50% Min.


    Original
    ILD620/620GB ILQ620/620GB ILD620 TLP620-2 ILQ620 TLP620-4 ILD/Q620: ILD/Q620GB: TLP620-2 TLP620-4 2201 opto PDF

    ILD620

    Abstract: ILQ620 TLP620-2 TLP620-4 TLP620-4 optocoupler vce-24
    Contextual Info: DUAL CHANNEL ILD620/620GB QUAD CHANNEL ILQ620/620GB AC Input Phototransistor Optocoupler FEATURES • Identical Channel to Channel Footprint ILD620 Crosses to TLP620-2 ILQ620 Crosses to TLP620-4 • Current Transfer Ratio CTR at IF= ±5.0 mA ILD/Q620: 50% Min.


    Original
    ILD620/620GB ILQ620/620GB ILD620 TLP620-2 ILQ620 TLP620-4 ILD/Q620: ILD/Q620GB: TLP620-2 TLP620-4 TLP620-4 optocoupler vce-24 PDF

    620GB

    Contextual Info: VISHAY ILD620/ 620GB / ILQ620/ 620GB Vishay Semiconductors Optocoupler, Phototransistor Output, AC Input Dual, Quad Channel Features • • • • • Identical Channel to Channel Footprint ILD620 Crosses to TLP620-2 ILQ620 Crosses to TLP620-4 High Collector-Emitter Voltage, BVCEO = 70 V


    Original
    ILD620/ 620GB ILQ620/ 620GB ILD620 TLP620-2 ILQ620 TLP620-4 E52744 VDE0884) PDF

    QUAD Phototransistor Optocouplers

    Contextual Info: DUAL CHANNEL ILD620/620GB ILQ620/620GB QUAD CHANNEL AC Input Phototransistor Optocoupler FEATURES • Identical Channel to Channel Footprint ILD620 Crosses toTLP620-2 ILQ620 Crosses toTLP620-4 • Current Transfer Ratio CTR at / F= ±5.0 mA ILD/Q620: 50% Min.


    OCR Scan
    ILD620 toTLP620-2 ILQ620 toTLP620-4 ILD/Q620: ILD/Q620GB: E52744 1-888-lnfineon QUAD Phototransistor Optocouplers PDF

    Contextual Info: SIEMENS ILD620 /620 G B QUAD CHANNEL ILQ620 /620 G B DUAL CHAfflHEL AC Input Phototransislor Optocoupler FEATURES • Identical Channel to Channel Footprint ILD620 C roM M toTLPMO-2 H.Q620 Crosses to TLP620-4 • CurrantTransfer Ratio CTR at Ip* ±5 mA IUVQ620:50%Mlh.


    OCR Scan
    ILD620 ILQ620 TLP620-4 IUVQ620 ILD/Q620GB: IUVQ620GB: ILD/Q620/GB PDF

    Contextual Info: ILD620, ILD620GB, ILQ620, ILQ620GB www.vishay.com Vishay Semiconductors Optocoupler, Phototransistor Output, AC Input Dual, Quad Channel FEATURES Dual Channel A/C Quad Channel 1 8 • • • • • Identical channel to channel footprint ILD620 crosses to TLP620-2


    Original
    ILD620, ILD620GB, ILQ620, ILQ620GB ILD620 TLP620-2 ILQ620 TLP620-4 2002/95/EC. 2002/95/EC PDF

    IEC60965

    Abstract: ILD620 ILQ620 TLP620-2 TLP620-4 VDE0884
    Contextual Info: VISHAY ILD620/ 620GB / ILQ620/ 620GB Vishay Semiconductors Optocoupler, Phototransistor Output, AC Input Dual, Quad Channel Features • • • • • Identical Channel to Channel Footprint ILD620 Crosses to TLP620-2 ILQ620 Crosses to TLP620-4 High Collector-Emitter Voltage, BVCEO = 70 V


    Original
    ILD620/ 620GB ILQ620/ 620GB ILD620 TLP620-2 ILQ620 TLP620-4 E52744 VDE0884) IEC60965 TLP620-2 TLP620-4 VDE0884 PDF

    smd dual diode code 68

    Abstract: ILD620GB ILQ620x001 ILQ620 ILQ620-X009T 1000T ILD620-X009T
    Contextual Info: ILD620, ILD620GB, ILQ620, ILQ620GB www.vishay.com Vishay Semiconductors Optocoupler, Phototransistor Output, AC Input Dual, Quad Channel A/C Dual Channel Quad Channel 1 8 C FEATURES A/C 2 7 E • Identical channel to channel footprint A/C 3 6 C • ILD620 crosses to TLP620-2


    Original
    ILD620, ILD620GB, ILQ620, ILQ620GB ILD620 TLP620-2 ILQ620 TLP620-4 2002/95/EC 2002/96/EC smd dual diode code 68 ILD620GB ILQ620x001 ILQ620-X009T 1000T ILD620-X009T PDF

    Contextual Info: SIEMENS ILD620/620GB QUAD CHANNEL ILQ620/620GB DUAL CHANNEL AC INPUT PHOTOTRANSISTOR OPTOCOUPLER FEA TU R ES • Identical Channel to Channel Footprint ILD620 C rosses to TL P 620-2 ILQ620 C rosses to T LP 620-4 • Current Transfer Ratio CTR at lp= ± 5 mA


    OCR Scan
    ILD620 ILQ620 ILD/Q620: ILD/Q620GB: ILD/Q62G: E52744 ILD/Q620 0062G/GB PDF

    VP07

    Abstract: q620
    Contextual Info: SIEMENS ILD620/620GB ILQ620/620GB DUAL CHANNEL QUAD CHANNEL AC INPUT PHOTOTRANSISTOR OPTOCOUPLER FEATURES • Identical Channel to Channel Footprint ILD620 Crosses toTLP620-2 ILQ620 Crosses toTLP620-4 • Current Transfer Ratio CTR at lp= +5 mA ILD/Q620: 50% Min.


    OCR Scan
    ILD620 toTLP620-2 ILQ620 toTLP620-4 ILD/Q620: ILD/Q620GB: E52744 /Q620/GB VP07 q620 PDF

    Contextual Info: SIEMENS ILD620/620GB ILQ620/620GB DUAL CHANNEL QUAD CHANNEL AC INPUT PHOTOTRANSISTOR OPTOCOUPLER FEATURES • Identical Channel to Channel Footprint ILD620 Crosses toTLP 620-2 ILQ620 Crosses to TLP 620-4 • Current Transfer Ratio CTR at lp= ±5 mA ILD/Q620: 50% Min.


    OCR Scan
    ILD620/620GB ILQ620/620GB ILD620 ILQ620 ILD/Q620: ILD/Q620GB: ILD/Q620/GB PDF

    optocoupler H11A

    Abstract: optocoupler H11B H11d optocoupler il420 MCT6 opto h11c optocoupler 4n35 optocoupler AAB1 lh1502 AB LH1546
    Contextual Info: Optocoupler Option 1 Option 1 Optocouplers for Safe Electrical Insulation per DIN VDE 0884* These optocouplers are suitable for safe electrical insulation only within the safety maximum ratings. Compliance with the safety maximum ratings must be ensured by protective circuits.


    Original
    affec098 1-888-Infineon optocoupler H11A optocoupler H11B H11d optocoupler il420 MCT6 opto h11c optocoupler 4n35 optocoupler AAB1 lh1502 AB LH1546 PDF

    TLP621 optocoupler

    Abstract: q621
    Contextual Info: SIEMENS DUAL CHANNEL ILD621/621GB ILQ621/621GB QUAD CHANNEL MULTI-CHANNEL PHOTOTRANSISTOR OPTOCOUPLER FEATURES • Alternate Source to TLP621 -2/-4 and TLP621GB-2/-4 • Current Transfer Ratio CTR at lp= 5 mA ILD/Q621:50% Min. ILD/Q621GB: 100% Min. • Saturated Current Transfer Ratio (CTRs AT)


    OCR Scan
    TLP621 TLP621GB-2/-4 ILD/Q621 ILD/Q621GB: ILD/Q621: E52744 /Q621/GB TLP621 optocoupler q621 PDF

    cosmo 817

    Abstract: KP1010 cosmo kp1010 817 cosmo cosmo KP1010 cosmo 4N35 KP1010 PHOTO COUPLER cosmo 817 c tlp281 cross reference vishay TLP421-4
    Contextual Info: Photo Coupler COSMO SHARP NEC TOSHIBA KPS2801 PC3H2 PS2801-1 TLP281 KP1010 PC817 PC123 PS2501-1 PS2561-1 TLP421 TLP521 TLP621 KP1020 PC827 PS2501-2 PS2561-2 KP1040 PC847 PS2501-4 PS2561-4 TLP421-2 TLP521-2 TLP621-2 TLP421-4 TLP521-4 TLP621-4 K2010 PC4N35 PS2601


    Original
    KPS2801 PS2801-1 KP1010 PS2501-1 PS2561-1 TLP421 TLP521 TLP621 KP1020 PC827 cosmo 817 KP1010 cosmo kp1010 817 cosmo cosmo KP1010 cosmo 4N35 KP1010 PHOTO COUPLER cosmo 817 c tlp281 cross reference vishay TLP421-4 PDF