EL817(M)(B))-VG Optoisolator Equivalent & Substitute Parts

Part Overview

The EL817(M)(B))-VG is a 5000Vrms isolation optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This single-channel 4-DIP component provides galvanic isolation for DC input signals with a maximum output current of 50mA per channel. The part is Active in product status with 900 units currently in stock. Substitute parts are identified when equivalent electrical isolation, output characteristics, and mechanical compatibility are required for design flexibility, supply chain alternatives, or inventory optimization.

Substiute Parts

EL817(M)(B))-VG

Everlight Electronics Co LtdIn Stock: 919EL817(M)(B))-VG Datasheet

Current PartRFQ

TLP785(BL,F)

Toshiba Semiconductor and StorageIn Stock: 6014TLP785(BL,F) Datasheet

SimilarRFQ

TLP785(F)

Toshiba Semiconductor and StorageIn Stock: 2426TLP785(F) Datasheet

SimilarRFQ

TLP785(GR,F)

Toshiba Semiconductor and StorageIn Stock: 3126TLP785(GR,F) Datasheet

SimilarRFQ

VO618A-2

Vishay Semiconductor Opto DivisionIn Stock: 4441VO618A-2 Datasheet

SimilarRFQ

VO618A-4

Vishay Semiconductor Opto DivisionIn Stock: 12873VO618A-4 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the EL817(M)(B))-VG are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - Isolation: 5000Vrms minimum (5300Vrms acceptable as higher rating)
• Output Type: Transistor
• Number of Channels: 1
• Voltage - Output (Max): 80V
• Current - Output / Channel: 50mA
• Operating Temperature Range: -55°C ~ 110°C
• Mounting Type: Through Hole
• Package / Case: 4-DIP configuration

Allowable Variations:

• Current Transfer Ratio: Ranges vary by part; substitution valid when application requirements fall within the specified minimum and maximum values of the substitute part
• Rise / Fall Time: Variations acceptable when application timing requirements are met
• Vce Saturation: Variations acceptable within specified maximum ratings
• Package dimensions: 4-DIP format with minor dimensional variations (0.300" to 0.400" body width) are compatible in through-hole applications

All identified substitute parts meet or exceed the isolation voltage, output voltage, and current specifications of the main part while maintaining the same functional output type and operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes - Toshiba TLP785 Series:

The TLP785(GR,F), TLP785(BL,F), and TLP785(F) from Toshiba Semiconductor and Storage are direct functional equivalents. All three variants maintain 5000Vrms isolation, 80V maximum output voltage, and 50mA output current specifications. All are Active products with RoHS compliance. The TLP785(GR,F) and TLP785(F) carry ROHS3 certification matching the main part. These parts feature improved rise/fall times (2µs, 3µs) compared to the EL817(M)(B))-VG (6µs, 8µs), with turn-on/turn-off times of 3µs. Current Transfer Ratio ranges vary: TLP785(GR,F) specifies 100-300% @ 5mA, TLP785(BL,F) specifies 200-600% @ 5mA, and TLP785(F) specifies 50-600% @ 5mA. Selection among these three depends on application requirements for current transfer ratio performance.

Secondary Substitutes - Vishay VO618A Series:

The VO618A-4 and VO618A-2 from Vishay Semiconductor Opto Division provide higher isolation voltage (5300Vrms) with equivalent output specifications. Both are Active products with ROHS3 compliance and REACH Unaffected status. The VO618A-4 specifies 160-320% Current Transfer Ratio @ 1mA, while VO618A-2 specifies 63-125% @ 1mA. These parts feature faster switching characteristics (turn-on/turn-off 3µs, 2.3µs; rise/fall 2µs, 2µs) and lower forward voltage (1.1V typical). The higher isolation rating provides additional design margin in high-voltage applications.

Compliance and Availability:

All substitute parts are Active products with unlimited moisture sensitivity (MSL 1). Inventory availability is higher for substitute parts: VO618A-4 (12,850 units), TLP785(BL,F) (5,999 units), VO618A-2 (4,394 units), and TLP785(GR,F) (3,099 units) compared to the main part (900 units). All parts carry EAR99 export classification and HTSUS code 8541.49.8000.

Frequently Asked Questions (FAQ)

Q: Can TLP785 parts directly replace EL817(M)(B))-VG in existing PCB designs?

A: TLP785 parts are functionally equivalent with identical isolation voltage (5000Vrms), output voltage (80V), and output current (50mA) specifications. However, package body dimensions differ: EL817(M)(B))-VG uses 4-DIP (0.400", 10.16mm) while TLP785 variants use 4-DIP (0.300", 7.62mm). Both are through-hole 4-DIP packages with identical pin spacing and pinout. PCB footprints designed for standard 4-DIP spacing accommodate both variants. Verify PCB layout clearances if the narrower body width affects component placement.

Q: What is the difference between TLP785(GR,F), TLP785(BL,F), and TLP785(F)?

A: All three TLP785 variants share identical electrical specifications for isolation voltage, output voltage, output current, and operating temperature. The primary difference is Current Transfer Ratio performance: TLP785(GR,F) specifies 100-300% @ 5mA, TLP785(BL,F) specifies 200-600% @ 5mA, and TLP785(F) specifies 50-600% @ 5mA. Selection depends on the application's input current and required output current characteristics. The designation suffixes (GR, BL, F) indicate different performance grades within the TLP785 family.

Q: Why do Vishay VO618A parts have higher isolation voltage (5300Vrms) than the main part (5000Vrms)?

A: The VO618A-4 and VO618A-2 are rated for 5300Vrms isolation, which exceeds the 5000Vrms specification of the EL817(M)(B))-VG. Higher isolation voltage ratings provide additional design margin and safety factor in high-voltage isolation applications. These parts are direct substitutes when the application requires or benefits from enhanced isolation performance. All other electrical and mechanical parameters remain equivalent.

Q: Are there differences in Current Transfer Ratio measurement conditions between parts?

A: Yes. The EL817(M)(B))-VG specifies Current Transfer Ratio at 5mA input current (130-260%), while VO618A parts specify it at 1mA input current (VO618A-4: 160-320%, VO618A-2: 63-125%). TLP785 variants specify at 5mA (TLP785(GR,F): 100-300%, TLP785(BL,F): 200-600%, TLP785(F): 50-600%). When selecting a substitute, ensure the application's input current falls within the specified measurement condition of the chosen part to achieve the required output current performance.

Q: What are the switching speed differences between the main part and substitutes?

A: The EL817(M)(B))-VG specifies rise/fall times of 6µs and 8µs with no turn-on/turn-off time specified. All TLP785 variants specify faster switching: turn-on/turn-off times of 3µs with rise/fall times of 2µs and 3µs. Vishay VO618A parts specify turn-on/turn-off times of 3µs with rise/fall times of 2µs and 2µs. Faster switching characteristics in substitute parts do not prevent substitution in applications designed for the EL817(M)(B))-VG; however, applications with strict timing requirements should confirm that faster switching does not introduce signal integrity issues.

Q: Is the higher Vce Saturation (400mV) of substitute parts a concern?

A: The EL817(M)(B))-VG specifies Vce Saturation (Max) of 200mV, while all substitute parts specify 400mV. Higher saturation voltage increases the voltage drop across the transistor output stage. In applications where output voltage headroom is critical, this difference must be evaluated. For most standard isolation applications with 80V maximum output voltage rating, the 200mV difference is acceptable. Applications operating near the maximum output voltage limit should confirm that the higher saturation voltage does not violate circuit requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. The main part EL817(M)(B))-VG is ROHS3 Compliant. TLP785(GR,F) and TLP785(F) are ROHS3 Compliant. TLP785(BL,F) is RoHS Compliant. VO618A-4 and VO618A-2 are ROHS3 Compliant. All parts meet RoHS requirements. VO618A parts additionally carry REACH Unaffected status.