MOC3033FM Equivalent & Substitute Parts

Part Overview

The MOC3033FM is a 7.5kV optoisolator with triac output manufactured by onsemi in a 6-SMD surface mount package. This component provides galvanic isolation between control and power circuits with zero-crossing detection capability. The MOC3033FM is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

MOC3033FM

onsemiIn Stock: 950MOC3033FM Datasheet

Current PartRFQ

MOC3033SM

onsemiIn Stock: 3912MOC3033SM Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MOC3033FM is determined by the following critical parameters:

• Output Type: Must be Triac output for direct functional replacement
• Zero Crossing Circuit: Must include zero-crossing detection to maintain circuit behavior
• Number of Channels: Must be single channel (1 Channel)
• Voltage - Off State: Must support 250 V minimum
• Current - LED Trigger (Ift): Must not exceed 5mA maximum
• Current - Hold (Ih): Must support 400µA typical operation
• Current - DC Forward (If): Must support 60 mA maximum
• Mounting Type: Must be Surface Mount
• Package / Case: Must be 6-SMD, Gull Wing configuration

The MOC3033SM meets all substitution criteria. While the MOC3033SM specifies a lower isolation voltage rating (4170Vrms versus 7500Vpk), it maintains functional compatibility across all other critical parameters and is classified as Active product status with current manufacturing support.

Parameter Comparison

Engineering Selection Recommendations

The MOC3033SM is the designated substitute for the obsolete MOC3033FM. Both components share the same base product number (MOC303) and are manufactured by onsemi.

The MOC3033SM carries Active product status with current manufacturing support and availability. The component is ROHS3 compliant and holds UL approval agency certification, providing enhanced regulatory compliance compared to the MOC3033FM.

The primary design consideration is the isolation voltage specification. The MOC3033FM specifies 7500Vpk isolation, while the MOC3033SM specifies 4170Vrms isolation. Applications requiring the higher isolation voltage rating of the MOC3033FM must evaluate whether the MOC3033SM isolation specification meets system requirements before implementation.

Frequently Asked Questions (FAQ)

Q: Can MOC3033SM directly replace MOC3033FM in existing designs?

A: The MOC3033SM is functionally compatible across all electrical parameters except isolation voltage rating. The lower isolation voltage of the MOC3033SM (4170Vrms) must be evaluated against application requirements. If the original design does not require 7500Vpk isolation, direct substitution is possible without circuit modification.

Q: Are the packages identical between MOC3033FM and MOC3033SM?

A: Both components use 6-SMD, Gull Wing surface mount packages. PCB footprints and assembly processes are compatible.

Q: What is the difference between Vpk and Vrms isolation ratings?

A: Vpk (peak voltage) and Vrms (RMS voltage) represent different measurement standards for isolation voltage. The MOC3033FM specifies 7500Vpk while the MOC3033SM specifies 4170Vrms. These values reflect different testing methodologies and cannot be directly compared numerically.

Q: Is the MOC3033SM available in production quantities?

A: The MOC3033SM is classified as Active product status with current manufacturing support. Inventory availability should be confirmed with component suppliers.

Q: What certifications does the MOC3033SM carry?

A: The MOC3033SM holds UL approval agency certification and is ROHS3 compliant. The MOC3033FM does not specify approval agency certification.