VO4254H Optoisolator Equivalent & Substitute Parts

Part Overview

The VO4254H is a 5.3kV isolation optoisolator with triac output manufactured by Vishay Semiconductor Opto Division in a 6-DIP through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The VO4254H provides single-channel triac isolation suitable for AC switching applications requiring high voltage isolation and fast switching characteristics.

Substiute Parts

VO4254H

Vishay Semiconductor Opto DivisionIn Stock: 1055VO4254H Datasheet

Current PartRFQ

EL3021

Everlight Electronics Co LtdIn Stock: 66589EL3021 Datasheet

MFR RecommendedRFQ

EL3022

Everlight Electronics Co LtdIn Stock: 24994EL3022 Datasheet

MFR RecommendedRFQ

EL3023

Everlight Electronics Co LtdIn Stock: 83402EL3023 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the VO4254H are selected based on the following critical parameters that define functional equivalence:

• Single-channel triac output optoisolator configuration
• 6-DIP through-hole package format (0.300", 7.62mm)
• Isolation voltage rating of 5000Vrms or higher
• Off-state voltage of 400V
• Operating temperature range of -55°C to 100°C
• ROHS3 compliance and MSL 1 rating
• Through-hole mounting compatibility

The substitute parts EL3021, EL3022, and EL3023 from Everlight Electronics Co Ltd meet these core requirements. All three alternatives are active products with established supply availability, addressing the obsolescence of the VO4254H. The primary differences among substitutes relate to LED trigger current specifications, which determine input drive requirements but do not affect output switching capability or isolation performance.

Parameter Comparison

Engineering Selection Recommendations

All three Everlight substitute parts (EL3021, EL3022, EL3023) are active products with full regulatory compliance. Selection among these alternatives depends on input drive circuit design:

EL3023 requires the lowest LED trigger current at 5mA maximum, making it suitable for designs with limited input drive capability or where power efficiency is prioritized.

EL3022 provides a mid-range trigger current specification of 10mA, offering balanced performance for standard input drive circuits.

EL3021 accepts up to 15mA LED trigger current, accommodating designs with higher input drive capability or where additional margin is required.

All three parts maintain identical isolation voltage (5000Vrms), off-state voltage (400V), operating temperature range (-55°C to 100°C), and package format (6-DIP). The VO4254H's higher isolation rating of 5300Vrms and on-state current of 300mA are not matched by the Everlight alternatives, which specify 5000Vrms isolation and 100mA on-state current. Applications requiring these higher specifications must evaluate alternative product families.

Frequently Asked Questions (FAQ)

Q: Can EL3021, EL3022, or EL3023 directly replace VO4254H in existing designs?

A: Direct pin-compatible replacement is possible due to identical 6-DIP package format and pinout. However, the Everlight parts specify lower on-state current (100mA vs. 300mA) and lower isolation voltage (5000Vrms vs. 5300Vrms). Designs operating at the VO4254H's maximum ratings require evaluation to confirm the Everlight alternatives meet application requirements.

Q: What is the difference between EL3021, EL3022, and EL3023?

A: The three parts differ only in LED trigger current specification: EL3023 (5mA max), EL3022 (10mA max), and EL3021 (15mA max). All other electrical and mechanical parameters are identical. Selection is based on input drive circuit design and available drive current.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. VO4254H, EL3021, EL3022, and EL3023 are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What certifications do the Everlight parts carry?

A: EL3021, EL3022, and EL3023 carry CSA, DEMKO, FIMKO, NEMKO, SEMKO, and UL approvals. The VO4254H carries cUR, FIMKO, and UR approvals. Verify certification requirements for your specific application.

Q: Is the VO4254H still available?

A: The VO4254H is classified as obsolete. Everlight EL3021, EL3022, and EL3023 are active products with established supply availability.