MOC3020SVM Optoisolator Equivalent & Substitute Parts

Part Overview

The MOC3020SVM is a 4.17kV isolation optoisolator with triac output manufactured by onsemi in 6-SMD surface mount packaging. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The MOC302x series from Lite-On Inc. provides direct functional alternatives with enhanced isolation voltage ratings and active product status.

Substiute Parts

MOC3020SVM

onsemiIn Stock: 34371MOC3020SVM Datasheet

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MOC3020S

Lite-On Inc.In Stock: 1499MOC3020S Datasheet

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MOC3020S-TA1

Lite-On Inc.In Stock: 59996MOC3020S-TA1 Datasheet

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MOC3021S

Lite-On Inc.In Stock: 35264MOC3021S Datasheet

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MOC3021S-TA1

Lite-On Inc.In Stock: 100202MOC3021S-TA1 Datasheet

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MOC3022S

Lite-On Inc.In Stock: 25544MOC3022S Datasheet

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MOC3022S-TA1

Lite-On Inc.In Stock: 125385MOC3022S-TA1 Datasheet

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MOC3023S

Lite-On Inc.In Stock: 2651MOC3023S Datasheet

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MOC3023S-TA1

Lite-On Inc.In Stock: 155383MOC3023S-TA1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MOC3020SVM is based on the following critical parameters that must be maintained or exceeded:

• Output Type: Triac output configuration
• Voltage - Isolation: Minimum 4170Vrms (all Lite-On substitutes provide 5000Vrms, exceeding this requirement)
• Voltage - Off State: 400 V
• Number of Channels: Single channel
• Mounting Type: Surface mount
• Package / Case: 6-SMD, Gull Wing
• Current - LED Trigger (Ift): Maximum 30mA (substitutes range from 5mA to 30mA, all acceptable)
• Voltage - Forward (Vf): 1.15V typical
• Operating Temperature Range: Minimum -40°C to 85°C (all substitutes support -40°C to 100°C, exceeding this requirement)

All Lite-On MOC302x series parts meet or exceed these parameters. Substitutes differ primarily in LED trigger current (Ift) specifications, which determine the input drive requirements but do not affect output functionality when properly driven.

Parameter Comparison

Engineering Selection Recommendations

All Lite-On MOC302x series optoisolators are direct functional substitutes for the obsolete MOC3020SVM. Selection among the available substitutes depends on input drive circuit design:

MOC3020S / MOC3020S-TA1: Identical LED trigger current specification (30mA maximum) to the original MOC3020SVM. These are the primary substitutes when existing input drive circuits are optimized for 30mA trigger current.

MOC3021S / MOC3021S-TA1: Reduced LED trigger current requirement (15mA maximum). Suitable for designs requiring lower input drive power or when input current budgets are constrained.

MOC3022S / MOC3022S-TA1: Further reduced LED trigger current (10mA maximum). Applicable for low-power input signal conditioning circuits.

MOC3023S / MOC3023S-TA1: Minimum LED trigger current (5mA maximum). Optimal for ultra-low-power input driver applications.

All substitutes provide enhanced isolation voltage (5000Vrms versus 4170Vrms), extended operating temperature range (-40°C to 100°C versus -40°C to 85°C), and ROHS3 compliance. Packaging variants include Tube, Cut Tape (CT) & Digi-Reel, and unspecified options to accommodate different procurement and assembly workflows.

Frequently Asked Questions (FAQ)

Q: Can MOC3021S, MOC3022S, or MOC3023S be used as direct replacements for MOC3020SVM?

A: Yes. All MOC302x series parts share identical output characteristics, isolation voltage (exceeding the original specification), off-state voltage, package, and mounting type. The primary difference is LED trigger current, which affects input drive requirements but not output functionality. Selection depends on input circuit design.

Q: What is the significance of the different LED trigger current (Ift) specifications?

A: LED trigger current determines the minimum input current required to activate the optoisolator. MOC3020S matches the original 30mA specification. MOC3021S, MOC3022S, and MOC3023S require progressively lower input currents (15mA, 10mA, and 5mA respectively). Lower trigger current reduces input driver power consumption and allows use of higher-impedance input signal sources.

Q: Are the -TA1 variants functionally equivalent to non-TA1 versions?

A: Yes. The -TA1 suffix indicates packaging and tape/reel configuration differences (Cut Tape & Digi-Reel versus Tube). Electrical specifications and functional performance are identical. Selection is based on procurement and assembly requirements.

Q: What is the impact of the higher isolation voltage (5000Vrms) in Lite-On substitutes?

A: The 5000Vrms isolation rating exceeds the original 4170Vrms specification, providing enhanced safety margin and noise immunity in high-voltage isolation applications. This is a beneficial characteristic that does not require circuit redesign.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All Lite-On MOC302x series parts are ROHS3 compliant. The original MOC3020SVM does not specify RoHS status. Substitutes meet current environmental and regulatory requirements for new designs.

Q: What packaging options are available for the MOC302x series?

A: Lite-On offers MOC302x optoisolators in Tube packaging and Cut Tape (CT) & Digi-Reel packaging. Selection depends on assembly process requirements and procurement volume. All variants maintain identical electrical specifications and 6-SMD, Gull Wing package geometry.