MOC3043FM Equivalent & Substitute Parts

Part Overview

The MOC3043FM is an optoisolator with triac output manufactured by onsemi, designed for applications requiring galvanic isolation up to 7500Vpk. This component features a single channel with zero-crossing detection and is packaged in a 6-SMD surface mount configuration. The MOC3043FM is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

MOC3043FM

onsemiIn Stock: 965MOC3043FM Datasheet

Current PartRFQ

MOC3043SM

onsemiIn Stock: 12778MOC3043SM Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MOC3043FM is determined by the following critical parameters:

• Output Type: Must be Triac output
• Number of Channels: Must be single channel (1)
• Package / Case: Must be 6-SMD, Gull Wing surface mount
• Zero Crossing Circuit: Must include zero-crossing detection
• Current Specifications: LED trigger current (Ift) and hold current (Ih) must be compatible
• Voltage - Off State: Must support 400 V minimum

The MOC3043SM qualifies as a substitute based on matching all core functional and packaging parameters. While the MOC3043SM features a lower isolation voltage rating (4170Vrms versus 7500Vpk), it maintains identical channel configuration, output type, zero-crossing functionality, and SMD packaging. The substitute is suitable for applications where the lower isolation voltage meets design requirements.

Parameter Comparison

Engineering Selection Recommendations

The MOC3043SM is the identified substitute for the obsolete MOC3043FM. Selection between these components depends on isolation voltage requirements:

• MOC3043FM: 7500Vpk isolation voltage. Obsolete status limits availability to existing inventory.
• MOC3043SM: 4170Vrms isolation voltage. Active product status ensures ongoing availability and supply chain continuity. Includes UL approval and RoHS3 compliance certification.

For new designs or production requiring the MOC3043FM, the MOC3043SM is suitable when the lower isolation voltage specification is acceptable for the application. The MOC3043SM's active status and compliance certifications make it the preferred choice for long-term production support.

Frequently Asked Questions (FAQ)

Q: Can the MOC3043SM directly replace the MOC3043FM in existing designs?

A: Direct replacement is possible if the application isolation voltage requirement does not exceed 4170Vrms. The MOC3043SM maintains identical triac output functionality, single-channel configuration, zero-crossing detection, and 6-SMD gull wing packaging. Verify that your circuit design isolation voltage specification is compatible with the lower rating before substitution.

Q: What is the primary difference between MOC3043FM and MOC3043SM?

A: The primary difference is isolation voltage rating. The MOC3043FM provides 7500Vpk isolation, while the MOC3043SM provides 4170Vrms isolation. All other functional parameters, including output type, channel count, zero-crossing circuit, and current specifications, are identical.

Q: Why is the MOC3043FM listed as obsolete?

A: The MOC3043FM is classified as obsolete by the manufacturer. The MOC3043SM serves as the active replacement in the MOC304 product family, offering equivalent functionality with lower isolation voltage and improved compliance certifications.

Q: Are there any compliance differences between these parts?

A: The MOC3043SM includes UL approval and RoHS3 compliance certification. The MOC3043FM compliance information is not specified in available documentation. Both components are REACH unaffected and classified under ECCN EAR99.

Q: What packaging options are available for these optoisolators?

A: Both the MOC3043FM and MOC3043SM are supplied in 6-SMD, gull wing surface mount packages. The MOC3043SM is available in tube packaging. Both maintain MSL 1 (unlimited) moisture sensitivity level.