MOC3051FR2M Equivalent & Substitute Parts

Part Overview

The MOC3051FR2M is a 7.5kV isolation optoisolator with triac output manufactured by onsemi in a 6-SMD surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part provides galvanic isolation suitable for AC power control applications requiring high voltage isolation and triac switching capability.

Substiute Parts

MOC3051FR2M

onsemiIn Stock: 971MOC3051FR2M Datasheet

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MOC3051SR2M

onsemiIn Stock: 4610MOC3051SR2M Datasheet

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EL3051

Everlight Electronics Co LtdIn Stock: 52485EL3051 Datasheet

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EL3052

Everlight Electronics Co LtdIn Stock: 151994EL3052 Datasheet

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EL3053

Everlight Electronics Co LtdIn Stock: 17973EL3053 Datasheet

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IS3052G

Isocom Components 2004 LTDIn Stock: 858IS3052G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MOC3051FR2M is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Output Type: Triac (all substitutes must provide triac output)
• Voltage - Isolation: Minimum 7500Vpk or equivalent rms rating
• Voltage - Off State: 600 V (standard across all candidates)
• Static dV/dt: 1kV/µs (maintained across all substitutes)
• Current - LED Trigger (Ift): Maximum 15mA (input drive requirement)
• Current - Hold (Ih): Typical range 200–280µA
• Voltage - Forward (Vf): 1.15–1.20V (input LED forward voltage)
• Current - DC Forward (If): Maximum 60 mA (input current rating)
• Operating Temperature: -40°C minimum to 85°C minimum

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount or Through Hole (package form factor differs)
• Package / Case: 6-SMD Gull Wing (primary) or 6-DIP (alternative for through-hole designs)
• Number of Channels: 1 (single channel isolation)

Substitutes are grouped into two categories:

1. Direct Surface Mount Substitute (SMD Package): MOC3051SR2M — maintains SMD form factor but with reduced isolation voltage (4170Vrms). Suitable only where lower isolation voltage is acceptable.

2. Functional Equivalents (Through-Hole DIP Package): EL3051, EL3052, EL3053, and IS3052G — provide equivalent or superior isolation voltage (5000Vrms) with through-hole mounting. These require PCB redesign for package conversion.

Parameter Comparison

Engineering Selection Recommendations

For Surface Mount PCB Designs (SMD Package Required):

MOC3051SR2M is the only active substitute maintaining the 6-SMD Gull Wing package form factor. However, this part operates at 4170Vrms isolation voltage, which is 44% lower than the original MOC3051FR2M specification of 7500Vpk. Selection of MOC3051SR2M is appropriate only when the application isolation voltage requirement does not exceed 4170Vrms. The part is ROHS3 compliant and active in production.

For Through-Hole PCB Designs (DIP Package Acceptable):

EL3051, EL3052, EL3053, and IS3052G provide active, production-supported alternatives with isolation voltage ratings of 5000Vrms, which exceeds the original 7500Vpk specification. All four parts are ROHS3 compliant. Selection among these four depends on input drive current requirements:

• EL3051: 15mA maximum LED trigger current (matches original specification)
• EL3052: 10mA maximum LED trigger current (reduced drive requirement)
• EL3053: 5mA maximum LED trigger current (lowest drive requirement)
• IS3052G: 10mA maximum LED trigger current with extended temperature range to 100°C

EL3052 and EL3053 offer reduced input drive current, which may lower input circuit power consumption. IS3052G provides the widest operating temperature range (-40°C to 100°C) and is certified by UL and VDE.

Frequently Asked Questions (FAQ)

Q: Can MOC3051SR2M directly replace MOC3051FR2M in the same PCB footprint?

A: Yes, MOC3051SR2M uses the identical 6-SMD Gull Wing package and can be placed in the same footprint. However, the isolation voltage is reduced from 7500Vpk to 4170Vrms. Verify that your application isolation voltage requirement does not exceed 4170Vrms before substitution.

Q: What is the difference between the EL3051, EL3052, and EL3053 parts?

A: All three parts are manufactured by Everlight Electronics in 6-DIP through-hole packages with 5000Vrms isolation voltage. The primary difference is the maximum LED trigger current (Ift): EL3051 requires 15mA, EL3052 requires 10mA, and EL3053 requires 5mA. Lower trigger current reduces input circuit power consumption but requires lower input impedance to achieve reliable triggering.

Q: Can I use a through-hole DIP package substitute on a surface mount PCB?

A: No. Through-hole DIP packages (EL3051, EL3052, EL3053, IS3052G) require plated through-holes and cannot be mounted on surface mount PCBs designed for SMD components. PCB redesign is necessary to accommodate through-hole mounting.

Q: Is IS3052G suitable for high-temperature applications?

A: IS3052G operates from -40°C to 100°C, providing a 15°C higher maximum temperature rating than the original MOC3051FR2M (-40°C to 85°C). This part is appropriate for applications requiring extended temperature range. IS3052G is certified by UL and VDE.

Q: What are the compliance and certification differences among the substitutes?

A: MOC3051SR2M, EL3051, EL3052, and EL3053 are ROHS3 compliant. IS3052G is ROHS3 compliant and carries UL and VDE certifications. The original MOC3051FR2M carries UR approval. All parts are classified as EAR99 for export control purposes.

Q: If my design requires 7500Vpk isolation, which substitute should I use?

A: None of the listed substitutes match the original 7500Vpk isolation specification. The highest available isolation voltage among active substitutes is 5000Vrms (EL3051, EL3052, EL3053, IS3052G). If 7500Vpk isolation is mandatory, alternative optoisolator families with higher isolation ratings must be evaluated outside this substitute list.