MOC3031SDM Equivalent & Substitute Parts

Part Overview

The MOC3031SDM is an optoisolator with triac output manufactured by onsemi, designed for high-voltage isolation applications requiring 4170Vrms isolation rating. This component integrates a zero-crossing circuit in a 6-SMD surface mount package. The MOC3031SDM is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production support.

Substiute Parts

MOC3031SDM

onsemiIn Stock: 751MOC3031SDM Datasheet

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MOC3031SR2M

onsemiIn Stock: 2144MOC3031SR2M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MOC3031SDM is determined by strict equivalence across the following critical parameters:

• Isolation Voltage: 4170Vrms (mandatory match)
• Output Configuration: Triac output with zero-crossing circuit (mandatory match)
• Channel Count: Single channel (mandatory match)
• Package Type: 6-SMD, Gull Wing surface mount (mandatory match)
• Electrical Characteristics: LED trigger current, hold current, forward voltage, and DC forward current (must remain within specified ranges)
• Operating Temperature Range: -40°C ~ 85°C (mandatory match)
• Approval Certification: UL approval (required for equivalent functionality)

The MOC3031SR2M meets all substitution criteria as an active product variant of the same base product number (MOC303) with identical electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The MOC3031SR2M is the direct functional equivalent for the obsolete MOC3031SDM. Both components share identical electrical specifications, isolation ratings, and mechanical packaging. The MOC3031SR2M is currently in active production status, ensuring supply chain availability and ongoing manufacturer support.

The MOC3031SR2M provides additional compliance benefits through ROHS3 certification, meeting modern environmental and regulatory requirements. The primary difference is packaging format: MOC3031SR2M is supplied in Tape & Reel format, which is standard for automated assembly processes, whereas the MOC3031SDM was supplied in bulk packaging.

For applications requiring the obsolete MOC3031SDM, direct substitution with MOC3031SR2M is supported without circuit modification or performance degradation.

Frequently Asked Questions (FAQ)

Q: Can MOC3031SR2M replace MOC3031SDM in existing designs?

A: Yes. Both components are electrically and mechanically identical across all specified parameters. The MOC3031SR2M is the active production equivalent and provides direct substitution without design changes.

Q: What is the difference between MOC3031SDM and MOC3031SR2M?

A: The components are functionally identical. The primary differences are product status (MOC3031SDM is obsolete; MOC3031SR2M is active) and packaging format (MOC3031SR2M uses Tape & Reel packaging). MOC3031SR2M also carries ROHS3 compliance certification.

Q: Are there any compatibility concerns with the 6-SMD package?

A: No. Both parts use identical 6-SMD, Gull Wing surface mount packaging. PCB footprints, reflow profiles, and assembly processes remain unchanged.

Q: What is the isolation voltage rating, and is it the same for both parts?

A: Both MOC3031SDM and MOC3031SR2M provide 4170Vrms isolation voltage. This rating is maintained across all electrical and mechanical parameters.

Q: Does MOC3031SR2M meet current regulatory requirements?

A: Yes. MOC3031SR2M carries ROHS3 compliance certification and maintains UL approval, meeting current environmental and safety standards.

Q: Is the zero-crossing circuit present in both components?

A: Yes. Both MOC3031SDM and MOC3031SR2M include integrated zero-crossing detection circuits, enabling synchronized triac switching in AC applications.