VO4256M Optoisolator Equivalent & Substitute Parts

Part Overview

The VO4256M is an optoisolator with triac output manufactured by Vishay Semiconductor Opto Division. This component provides galvanic isolation up to 5300Vrms and is designed for applications requiring high-voltage switching control in a 6-DIP through-hole package. The part is currently active in production with full RoHS3 compliance and regulatory approvals from cUR, FIMKO, and UR. Equivalent and substitute parts are identified based on matching electrical isolation ratings, output type, package configuration, and operating temperature range to ensure functional compatibility in circuit applications.

Substiute Parts

VO4256M

Vishay Semiconductor Opto DivisionIn Stock: 755VO4256M Datasheet

Current PartRFQ

FOD420

onsemiIn Stock: 6010FOD420 Datasheet

MFR RecommendedRFQ

FOD4216

onsemiIn Stock: 4738FOD4216 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the VO4256M are qualified based on the following criteria:

• Output Type: Triac output configuration matching the main part
• Isolation Voltage: Minimum 5000Vrms isolation rating (VO4256M specifies 5300Vrms)
• Package Configuration: 6-DIP through-hole package with 0.300" (7.62mm) pitch
• Number of Channels: Single-channel configuration
• Operating Temperature Range: -55°C to 100°C compatibility
• Regulatory Compliance: RoHS3 compliance and international safety approvals (cUL, FIMKO, UL)

The identified substitutes (FOD420 and FOD4216) from onsemi meet these core electrical and mechanical requirements, enabling direct replacement in circuit designs where the VO4256M is specified.

Parameter Comparison

Engineering Selection Recommendations

Both FOD420 and FOD4216 are active production parts from onsemi with full RoHS3 compliance and international safety certifications (cUL, FIMKO, UL). These parts maintain the same 6-DIP through-hole package and operating temperature range as the VO4256M.

FOD420 is supplied in tube packaging, matching the VO4256M packaging format. FOD4216 is supplied in bulk packaging and features a lower maximum LED trigger current (1.3mA versus 2mA on FOD420), which may reduce input drive requirements in certain circuit topologies.

The isolation voltage rating of the onsemi substitutes (5000Vrms) is lower than the VO4256M (5300Vrms). Circuit designs operating at isolation voltages below 5000Vrms can use either substitute without derating. Applications requiring isolation above 5000Vrms should retain the VO4256M.

Frequently Asked Questions (FAQ)

Q: Can FOD420 or FOD4216 be used as direct pin-for-pin replacements for VO4256M?

A: Yes. Both parts share the same 6-DIP package pinout and through-hole mounting configuration. No PCB modifications are required for physical substitution.

Q: What is the key difference between FOD420 and FOD4216?

A: Both parts have identical electrical specifications except for maximum LED trigger current (Ift): FOD420 specifies 2mA maximum, while FOD4216 specifies 1.3mA maximum. FOD420 is supplied in tube packaging; FOD4216 is supplied in bulk packaging.

Q: Is the lower isolation voltage rating (5000Vrms) of the onsemi parts a limitation?

A: The onsemi substitutes are suitable for applications with isolation requirements up to 5000Vrms. If your circuit requires isolation above 5000Vrms, the VO4256M (5300Vrms) should be retained.

Q: Are the regulatory approvals equivalent between VO4256M and the substitute parts?

A: Both the VO4256M and substitute parts carry international safety certifications. The VO4256M holds cUR, FIMKO, and UR approvals. The onsemi parts hold cUL, FIMKO, and UL approvals. Both meet RoHS3 compliance requirements.

Q: What are the operating temperature ranges for these parts?

A: All three parts operate across the same temperature range: -55°C to 100°C.