VO4256D Optoisolator Triac Output Equivalent & Substitute Parts

Part Overview

The VO4256D is an optoisolator with triac output manufactured by Vishay Semiconductor Opto Division. This 6-DIP through-hole component provides 5300Vrms isolation voltage and is designed for applications requiring galvanic isolation with triac switching capability. The part is currently active in production with 10200 units in stock. Substitute parts may be required due to supply constraints, design revisions, or inventory management across manufacturing facilities.

Substiute Parts

VO4256D

Vishay Semiconductor Opto DivisionIn Stock: 10309VO4256D Datasheet

Current PartRFQ

FOD420

onsemiIn Stock: 6010FOD420 Datasheet

MFR RecommendedRFQ

FOD4216

onsemiIn Stock: 4738FOD4216 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the VO4256D is determined by the following critical parameters:

• Output Type: Triac (required match)
• Package / Case: 6-DIP (0.300", 7.62mm) (required match)
• Mounting Type: Through Hole (required match)
• Number of Channels: 1 (required match)
• Voltage - Isolation: Minimum 5000Vrms (VO4256D specifies 5300Vrms)
• Voltage - Off State: 600 V (required match)
• Operating Temperature Range: -55°C ~ 100°C (required match)
• RoHS Status: ROHS3 Compliant (required match)

The substitute parts FOD420 and FOD4216 meet all critical substitution criteria. Both are manufactured by onsemi, feature identical package geometry, mounting configuration, and thermal operating range. Both maintain ROHS3 compliance and provide isolation voltage at or above the minimum threshold.

Parameter Comparison

Engineering Selection Recommendations

Both FOD420 and FOD4216 are qualified substitutes for the VO4256D based on product status and compliance certifications. All three parts maintain active production status and ROHS3 compliance.

FOD420 is supplied in tube packaging, matching the original VO4256D packaging format. FOD4216 is supplied in bulk packaging, which may require repackaging for certain manufacturing workflows.

Both onsemi substitutes carry UL and cUL certifications alongside FIMKO approval, providing regulatory coverage equivalent to the original part's certification profile.

Frequently Asked Questions (FAQ)

Q: Can FOD420 and FOD4216 be used interchangeably with VO4256D?

A: Both parts meet the critical substitution criteria: identical triac output configuration, 6-DIP package geometry, through-hole mounting, single-channel design, 600V off-state voltage, and -55°C to 100°C operating range. Both maintain ROHS3 compliance and active product status.

Q: What is the difference between FOD420 and FOD4216?

A: The primary difference is packaging format. FOD420 is supplied in tube packaging; FOD4216 is supplied in bulk packaging. Electrically, both parts are equivalent, with FOD4216 featuring a lower maximum LED trigger current (1.3mA vs. 2mA).

Q: Does the isolation voltage difference affect substitution?

A: The VO4256D specifies 5300Vrms isolation, while both substitutes provide 5000Vrms. Both substitute parts meet the minimum isolation voltage requirement for this product category and maintain the same 600V off-state voltage specification.

Q: Are there any thermal or temperature considerations?

A: All three parts share the identical operating temperature range of -55°C to 100°C, ensuring thermal compatibility in equivalent circuit designs.

Q: What certifications apply to these parts?

A: VO4256D carries cUR, FIMKO, and UR approvals. FOD420 and FOD4216 carry cUL, FIMKO, and UL approvals. Both certification sets provide regulatory coverage for industrial and safety-critical applications.