MOC3022FM Optoisolator Equivalent & Substitute Parts

Part Overview

The MOC3022FM is a 7.5kV isolation optoisolator with triac output manufactured by onsemi in 6-SMD surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The MOC3022FM serves applications requiring galvanic isolation in triac-driven circuits with high isolation voltage requirements.

Substiute Parts

MOC3022FM

onsemiIn Stock: 988MOC3022FM Datasheet

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MOC3022SM

onsemiIn Stock: 34340MOC3022SM Datasheet

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EL3021

Everlight Electronics Co LtdIn Stock: 66589EL3021 Datasheet

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EL3022

Everlight Electronics Co LtdIn Stock: 24994EL3022 Datasheet

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EL3023

Everlight Electronics Co LtdIn Stock: 83402EL3023 Datasheet

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IS3020G

Isocom Components 2004 LTDIn Stock: 751IS3020G Datasheet

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IS3021G

Isocom Components 2004 LTDIn Stock: 1143IS3021G Datasheet

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IS3022G

Isocom Components 2004 LTDIn Stock: 863IS3022G Datasheet

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MOC3020

onsemiIn Stock: 19292MOC3020 Datasheet

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MOC3021

onsemiIn Stock: 247566MOC3021 Datasheet

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MOC3022

onsemiIn Stock: 67862MOC3022 Datasheet

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MOC3023

onsemiIn Stock: 231621MOC3023 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MOC3022FM is determined by the following critical parameters:

Primary Substitution Criteria:

• Output Type: Triac (mandatory match)
• Number of Channels: 1 (mandatory match)
• Voltage - Isolation: Minimum 7500Vpk or equivalent rms rating
• Voltage - Off State: 400 V (standard across all candidates)
• Current - LED Trigger (Ift): 10mA or lower acceptable
• Current - Hold (Ih): 100µA or higher acceptable
• Current - DC Forward (If): 60 mA or higher acceptable
• Mounting Type: Surface Mount preferred for direct replacement; Through Hole acceptable for circuit redesign

Substitution Groups:

Group 1 - Direct Surface Mount Replacement (Preferred): MOC3022SM is the active production equivalent with identical mounting type (6-SMD, Gull Wing). Isolation voltage is lower (4170Vrms vs 7500Vpk), requiring application verification.

Group 2 - Through Hole Alternatives (Package Redesign Required): EL3021, EL3022, EL3023 (Everlight), IS3020G, IS3021G, IS3022G (Isocom), MOC3020, MOC3021, MOC3022 (onsemi) all provide 5000-5300Vrms isolation in 6-DIP through-hole packaging. These require PCB layout modification but offer active product status and broader availability.

Parameter Comparison

Engineering Selection Recommendations

For Direct Surface Mount Replacement (No PCB Redesign): MOC3022SM is the only active production optoisolator in 6-SMD surface mount packaging. It maintains identical mounting type and electrical interface. The isolation voltage specification (4170Vrms) is lower than the MOC3022FM (7500Vpk). Application circuits operating below 4170Vrms isolation requirement can use MOC3022SM without modification. MOC3022SM carries UL approval and ROHS3 compliance.

For Through Hole Redesign (Active Production Status Priority): EL3022 and IS3022G both match the MOC3022FM LED trigger current specification (10mA maximum) and hold current (100µA typical). Both are active production parts with current certifications. EL3022 provides 5000Vrms isolation with CSA, DEMKO, FIMKO, NEMKO, SEMKO, and UL approvals. IS3022G provides 5300Vrms isolation. The choice between these depends on isolation voltage margin requirements and DIP package footprint compatibility (0.300" vs 0.400" pitch).

For Highest Isolation Voltage in Through Hole Format: IS3021G and IS3022G both provide 5300Vrms isolation, the highest among through-hole candidates. IS3022G matches the 10mA LED trigger specification exactly. Both are active production parts with ROHS3 compliance.

For Lowest LED Trigger Current Requirement: EL3023 specifies 5mA maximum LED trigger current, the lowest among all candidates. This part is suitable for applications with minimal input drive capability. EL3023 is active production with full certification coverage.

Frequently Asked Questions (FAQ)

Q: Can MOC3022SM directly replace MOC3022FM without circuit modification? A: MOC3022SM uses identical 6-SMD surface mount packaging and pinout. However, the isolation voltage is 4170Vrms versus the MOC3022FM's 7500Vpk. Direct substitution is possible only if your application isolation requirement does not exceed 4170Vrms. Verify isolation voltage margin in your circuit design before substitution.

Q: Why are most substitutes in through-hole DIP packaging when the original is surface mount? A: The MOC3022FM is obsolete. Active production optoisolators with comparable isolation voltage and triac output are primarily available in 6-DIP through-hole format. Through-hole substitution requires PCB layout redesign but provides access to current production parts with active manufacturer support and certifications.

Q: What is the difference between 7500Vpk and 5300Vrms isolation ratings? A: Peak voltage (Vpk) and RMS voltage (Vrms) are different measurement standards. 7500Vpk is approximately equivalent to 5300Vrms. The through-hole substitutes at 5300Vrms provide comparable isolation performance to the MOC3022FM at 7500Vpk. Verify your application's isolation voltage specification to confirm compatibility.

Q: Which substitute has the best availability? A: MOC3021 (onsemi) shows the highest inventory at 247,460 pieces. EL3023 (Everlight) has 83,300 pieces. MOC3022SM (onsemi, active production) has 34,300 pieces. Inventory levels vary by distributor and change over time; consult current supplier stock for real-time availability.

Q: Can I use IS3020G or IS3021G as substitutes? A: IS3020G and IS3021G are functionally compatible triac optoisolators with 5300Vrms isolation. IS3020G specifies 30mA maximum LED trigger current and IS3021G specifies 15mA. Both exceed the MOC3022FM's 10mA specification, requiring higher input drive current. Use these parts only if your circuit can supply the higher trigger current. Both are active production with ROHS3 compliance.

Q: What certifications should I verify for my application? A: Everlight EL-series parts carry CSA, DEMKO, FIMKO, NEMKO, SEMKO, and UL approvals. Isocom IS-series parts carry ROHS3 compliance. onsemi MOC3022SM carries UL approval and ROHS3 compliance. Verify that the substitute part's certifications match your application's regulatory requirements before final selection.

Q: Are there differences in hold current (Ih) between candidates? A: Yes. MOC3022FM specifies 100µA typical hold current. Everlight EL-series parts specify 250µA typical, which is higher. Isocom IS-series and onsemi MOC-series specify 100µA typical, matching the original. Higher hold current may affect circuit behavior in low-current applications; verify hold current compatibility with your triac load circuit.