MOC3051FVM Equivalent & Substitute Parts

Part Overview

The MOC3051FVM is an optoisolator with triac output manufactured by onsemi, designed for high-voltage isolation applications requiring 7500Vpk isolation rating. This component features a single channel with triac output configuration in a 6-SMD surface mount package. The product is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	MOC3051FVM
Manufacturer	onsemi
Output Type	Triac
Number of Channels	1
Voltage - Isolation	7500Vpk
Voltage - Off State	600 V
Static dV/dt (Min)	1kV/µs
Current - LED Trigger (Ift) (Max)	15mA
Current - Hold (Ih)	280µA (Typ)
Voltage - Forward (Vf) (Typ)	1.15V
Current - DC Forward (If) (Max)	60 mA
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	6-SMD, Gull Wing
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MOC3051FVM is constrained by the following critical parameters:

Output Type: Triac output configuration is mandatory
Number of Channels: Single channel requirement
Voltage - Isolation: Minimum 7500Vpk isolation rating
Voltage - Off State: 600 V capability
Static dV/dt: Minimum 1kV/µs performance
Current - LED Trigger (Ift): Maximum 15mA input requirement
Operating Temperature Range: -40°C to 85°C minimum coverage

The VO3052-X016 from Vishay Semiconductor Opto Division is identified as a substitute part. However, this component presents trade-offs in isolation voltage specification (5300Vrms versus 7500Vpk) and mounting technology (through-hole 6-DIP versus surface mount 6-SMD). The VO3052-X016 offers enhanced performance in dV/dt rating (1.5kV/µs), lower LED trigger current (10mA), and extended operating temperature range (-55°C to 100°C).

Parameter Comparison

Parameter	MOC3051FVM	VO3052-X016	Notes
Manufacturer	onsemi	Vishay Semiconductor Opto Division	Different manufacturers
Output Type	Triac	Triac	Matched
Number of Channels	1	1	Matched
Voltage - Isolation	7500Vpk	5300Vrms	Different specifications and units
Voltage - Off State	600 V	600 V	Matched
Static dV/dt (Min)	1kV/µs	1.5kV/µs	VO3052-X016 exceeds requirement
Current - LED Trigger (Ift) (Max)	15mA	10mA	VO3052-X016 lower requirement
Current - Hold (Ih)	280µA (Typ)	200µA (Typ)	VO3052-X016 lower value
Voltage - Forward (Vf) (Typ)	1.15V	1.2V	Minimal difference
Current - DC Forward (If) (Max)	60 mA	60 mA	Matched
Operating Temperature	-40°C ~ 85°C	-55°C ~ 100°C	VO3052-X016 wider range
Mounting Type	Surface Mount	Through Hole	Different mounting technologies
Package / Case	6-SMD, Gull Wing	6-DIP (0.400", 10.16mm)	Different package formats
Product Status	Obsolete	Active	VO3052-X016 actively manufactured

Engineering Selection Recommendations

The MOC3051FVM is obsolete and no longer in active production. The VO3052-X016 is an active product with current manufacturing support from Vishay Semiconductor Opto Division.

Selection of the VO3052-X016 as a substitute requires evaluation of the following factors:

Isolation Voltage Specification: The MOC3051FVM specifies 7500Vpk isolation, while the VO3052-X016 specifies 5300Vrms isolation. These are different measurement standards and cannot be directly compared without application-specific analysis.
Mounting Technology: The MOC3051FVM uses surface mount technology (6-SMD), while the VO3052-X016 uses through-hole technology (6-DIP). PCB layout and assembly process modifications are required for substitution.
Compliance and Certifications: Both components carry UR and VDE approvals. The VO3052-X016 includes cUR certification and is RoHS3 compliant. Both are REACH unaffected and classified as EAR99.
Operating Temperature Range: The VO3052-X016 provides extended temperature coverage (-55°C to 100°C) compared to the MOC3051FVM (-40°C to 85°C).
Electrical Performance: The VO3052-X016 demonstrates superior dV/dt performance (1.5kV/µs versus 1kV/µs) and lower LED trigger current requirement (10mA versus 15mA).

Frequently Asked Questions (FAQ)

Q: Can the VO3052-X016 directly replace the MOC3051FVM in existing designs?

A: Direct replacement is not possible due to different mounting technologies. The MOC3051FVM is a surface mount component (6-SMD), while the VO3052-X016 is a through-hole component (6-DIP). PCB redesign and assembly process changes are required.

Q: How do the isolation voltage specifications compare?

A: The MOC3051FVM specifies 7500Vpk isolation, while the VO3052-X016 specifies 5300Vrms isolation. These use different measurement standards (peak voltage versus RMS voltage). Direct numerical comparison is not valid without application-specific voltage profile analysis.

Q: What are the key electrical differences between these components?

A: The VO3052-X016 offers improved dV/dt performance (1.5kV/µs versus 1kV/µs) and requires lower LED trigger current (10mA versus 15mA). Both components maintain 600V off-state voltage and 60mA maximum DC forward current specifications.

Q: Is the VO3052-X016 suitable for the same temperature range applications?

A: The VO3052-X016 supports an extended operating temperature range (-55°C to 100°C) compared to the MOC3051FVM (-40°C to 85°C). Applications within the MOC3051FVM temperature range are covered by the VO3052-X016 specification.

Q: What certifications apply to the VO3052-X016?

A: The VO3052-X016 carries cUR, UR, and VDE approvals. It is RoHS3 compliant and REACH unaffected. Both components are classified as EAR99 for export control purposes.

Q: Why is the MOC3051FVM listed as obsolete?

A: The MOC3051FVM is no longer in active production by onsemi. The VO3052-X016 from Vishay Semiconductor Opto Division is an active product with ongoing manufacturing support and availability.

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