EL817(B)-VG Equivalent & Substitute Parts

Part Overview

The EL817(B)-VG is an optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This component provides galvanic isolation up to 5000Vrms with a single channel configuration in a 4-DIP package. The part is currently active in production with 1138 pieces available in stock.

Substitute parts are identified when equivalent electrical and mechanical parameters are available from alternative manufacturers. Substitution becomes necessary due to supply chain considerations, inventory availability, or design flexibility requirements while maintaining functional compatibility within specified parameter ranges.

Substiute Parts

EL817(B)-VG

Everlight Electronics Co LtdIn Stock: 1195EL817(B)-VG Datasheet

Current PartRFQ

VO618A-2

Vishay Semiconductor Opto DivisionIn Stock: 4441VO618A-2 Datasheet

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VO618A-4

Vishay Semiconductor Opto DivisionIn Stock: 12873VO618A-4 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the EL817(B)-VG are identified based on the following critical parameters that determine functional compatibility:

Isolation Voltage: The EL817(B)-VG provides 5000Vrms isolation. Substitute parts must meet or exceed this isolation specification. The identified substitutes (VO618A-2 and VO618A-4) provide 5300Vrms isolation, which satisfies this requirement.

Package and Mounting: All substitute parts use the same 4-DIP (0.300", 7.62mm) through-hole package, ensuring mechanical and electrical compatibility on printed circuit boards designed for the EL817(B)-VG.

Output Configuration: All parts feature single-channel transistor output with identical maximum output voltage (80V) and output current (50mA) specifications.

Operating Temperature Range: All parts operate across the identical temperature range of -55°C to 110°C.

Input Type and Electrical Interface: All parts accept DC input signals with equivalent forward voltage and current specifications.

The VO618A-2 and VO618A-4 are both manufactured by Vishay Semiconductor Opto Division and share the same base product number (VO618), differing only in current transfer ratio specifications.

Parameter Comparison

Engineering Selection Recommendations

EL817(B)-VG (Primary Part): This part is active in production with ROHS3 compliance and MSL Level 1 rating. It is suitable for applications requiring 5000Vrms isolation with standard current transfer ratio performance. Current inventory of 1138 pieces supports immediate procurement.

VO618A-4 (Preferred Substitute): This Vishay part provides higher isolation voltage (5300Vrms) and superior current transfer ratio performance (160% to 320% @ 1mA) compared to the EL817(B)-VG. The VO618A-4 maintains identical output voltage and current specifications while offering faster switching characteristics (2µs rise/fall time versus 6µs/8µs). Both parts are ROHS3 compliant with MSL Level 1 rating. Inventory availability is significantly higher at 12850 pieces. The VO618A-4 is suitable for applications where higher current transfer ratio or faster switching performance provides design margin.

VO618A-2 (Alternative Substitute): This Vishay part provides 5300Vrms isolation with lower current transfer ratio performance (63% to 125% @ 1mA). The VO618A-2 is suitable only for applications where the EL817(B)-VG current transfer ratio specifications exceed design requirements. Inventory availability is 4394 pieces. Both ROHS3 compliance and MSL Level 1 rating are maintained.

All three parts share identical package geometry, mounting type, operating temperature range, and compliance certifications, enabling direct substitution at the board level without design modification.

Frequently Asked Questions (FAQ)

Q: Can VO618A-4 directly replace EL817(B)-VG in existing designs?

A: Yes. Both parts use identical 4-DIP through-hole packages with matching pin configurations. The VO618A-4 provides equal or superior electrical performance across all critical parameters: isolation voltage (5300Vrms exceeds 5000Vrms requirement), output voltage (80V), output current (50mA), and operating temperature range (-55°C to 110°C). No circuit board modifications are required.

Q: What are the differences in current transfer ratio between these parts?

A: The EL817(B)-VG specifies 130% to 260% current transfer ratio at 5mA input current. The VO618A-4 specifies 160% to 320% at 1mA input current, indicating superior performance at lower input drive levels. The VO618A-2 specifies 63% to 125% at 1mA, which is lower than the EL817(B)-VG. Current transfer ratio differences affect input drive requirements and output switching characteristics.

Q: Are there compliance or regulatory differences between these parts?

A: No. All three parts are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating. The VO618A-2 and VO618A-4 carry additional REACH Unaffected designation. All parts share identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications.

Q: What is the significance of the 200mV versus 400mV Vce saturation difference?

A: The EL817(B)-VG specifies maximum Vce saturation of 200mV, while both Vishay substitutes specify 400mV. This parameter affects output voltage drop during transistor saturation. Applications requiring minimum output voltage drop should verify that the 400mV specification of VO618A-2 and VO618A-4 remains within system design margins.

Q: How do switching times compare between these optoisolators?

A: The EL817(B)-VG specifies rise/fall times of 6µs and 8µs respectively. Both VO618A-2 and VO618A-4 specify faster switching at 2µs rise and 2µs fall times. Faster switching enables higher frequency operation and reduced propagation delay. Applications with strict timing requirements should account for these differences.

Q: Which substitute part should be selected for new designs?

A: Selection depends on specific application requirements. The VO618A-4 is recommended for applications requiring higher current transfer ratio margin or faster switching performance. The VO618A-2 is suitable only if application requirements are less demanding than the EL817(B)-VG baseline specifications. The EL817(B)-VG remains appropriate for applications where its specified performance is sufficient and supply continuity is prioritized.