MOC3021FVM Equivalent & Substitute Parts

Part Overview

The MOC3021FVM is an optoisolator with triac output manufactured by onsemi, designed for high-voltage isolation applications. This component features 7500Vpk isolation voltage, single-channel triac output, and surface mount 6-SMD packaging. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

MOC3021FVM

onsemiIn Stock: 1190MOC3021FVM Datasheet

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MOC3021SVM

onsemiIn Stock: 34485MOC3021SVM Datasheet

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MOC3020X

Isocom Components 2004 LTDIn Stock: 12751MOC3020X Datasheet

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MOC3021X

Isocom Components 2004 LTDIn Stock: 12863MOC3021X Datasheet

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MOC3022X

Isocom Components 2004 LTDIn Stock: 1621MOC3022X Datasheet

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MOC3023X

Isocom Components 2004 LTDIn Stock: 3960MOC3023X Datasheet

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VO3023-X001

Vishay Semiconductor Opto DivisionIn Stock: 12693VO3023-X001 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MOC3021FVM is determined by the following critical parameters:

Primary Substitution Criteria:

• Output Type: Triac
• Number of Channels: 1
• Voltage - Off State: 400 V
• Current - Hold (Ih): 100µA (Typ)
• Moisture Sensitivity Level: 1 (Unlimited)
• REACH Status: REACH Unaffected

Secondary Compatibility Factors:

• Voltage - Isolation: Minimum 7500Vpk (or equivalent Vrms rating)
• Current - LED Trigger (Ift): Maximum 15mA
• Current - DC Forward (If): Maximum 60 mA

Substitute parts are grouped into two categories based on mounting type and isolation voltage specifications:

Group 1 - Surface Mount Alternatives (SMD): MOC3021SVM maintains surface mount packaging with reduced isolation voltage (4170Vrms), suitable for applications where lower isolation ratings are acceptable.

Group 2 - Through Hole Alternatives (DIP): MOC3020X, MOC3021X, MOC3022X, MOC3023X, and VO3023-X001 provide through-hole 6-DIP packaging with isolation voltages ranging from 5000Vrms to 5300Vrms. These parts differ primarily in LED trigger current specifications and operating temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

For Surface Mount Applications: MOC3021SVM is the direct surface mount substitute, maintaining 6-SMD gull wing packaging. This part is active and ROHS3 compliant. The isolation voltage is reduced to 4170Vrms compared to the original 7500Vpk specification. Selection of this part requires confirmation that the lower isolation rating meets application requirements.

For Through Hole Applications: When board redesign to through-hole 6-DIP packaging is acceptable, multiple active alternatives are available from Isocom Components and Vishay Semiconductor. All DIP alternatives provide isolation voltages between 5000Vrms and 5300Vrms, which are lower than the original specification but higher than the SMD alternative.

MOC3021X and MOC3023X maintain the 15mA and 5mA LED trigger current specifications respectively, matching the original part's trigger characteristics. MOC3020X and MOC3022X offer alternative trigger current ratings of 30mA and 10mA respectively.

VO3023-X001 from Vishay provides 5000Vrms isolation with 5mA trigger current and includes comprehensive international certifications (CQC, CSA, cUL, FIMKO, UL, VDE).

All substitute parts maintain 400V off-state voltage, 100µA hold current, and MSL 1 rating, ensuring compatibility with the original design constraints.

Frequently Asked Questions (FAQ)

Q: Can MOC3021SVM directly replace MOC3021FVM in existing PCB designs? A: Yes, MOC3021SVM maintains identical 6-SMD gull wing surface mount packaging and pinout compatibility. However, the isolation voltage is reduced from 7500Vpk to 4170Vrms. Verify that your application does not require the higher isolation rating before substitution.

Q: What is the primary difference between the SMD and DIP substitute options? A: MOC3021SVM retains surface mount 6-SMD packaging for direct PCB replacement. The DIP alternatives (MOC3020X, MOC3021X, MOC3022X, MOC3023X, VO3023-X001) require through-hole mounting and board redesign but offer higher isolation voltages (5000Vrms to 5300Vrms) compared to the SMD option.

Q: How do LED trigger current specifications affect part selection? A: LED trigger current (Ift) determines the input current required to activate the optoisolator. MOC3023X requires the lowest trigger current at 5mA, while MOC3020X requires the highest at 30mA. Select based on your input circuit's current-sourcing capability. MOC3021X matches the original 15mA specification.

Q: Are all substitute parts RoHS compliant? A: MOC3021SVM, MOC3020X, MOC3021X, MOC3022X, and MOC3023X are ROHS3 compliant. VO3023-X001 RoHS status is not specified in the provided data. Verify compliance requirements for your application before selection.

Q: What certifications should I consider for safety-critical applications? A: VO3023-X001 carries the most comprehensive international certifications including CQC, CSA, cUL, FIMKO, UL, and VDE. MOC3020X, MOC3021X, MOC3022X, and MOC3023X are certified by UR and VDE. MOC3021SVM is certified by IEC/EN/DIN and UL. Select based on your regional safety and compliance requirements.

Q: Can I use a substitute part with lower isolation voltage than the original? A: Substitution with lower isolation voltage is only acceptable if your application's isolation requirements do not exceed the substitute part's rating. The original MOC3021FVM specifies 7500Vpk isolation. All substitutes provide lower ratings. Conduct a detailed isolation analysis before proceeding with lower-rated parts.

Q: What is the operating temperature range difference between options? A: MOC3021SVM operates from -40°C to 85°C. All DIP alternatives (MOC3020X, MOC3021X, MOC3022X, MOC3023X, VO3023-X001) operate from -40°C to 100°C, providing a 15°C higher upper temperature limit. Select based on your thermal environment requirements.