MOC3051TM Equivalent & Substitute Parts

Part Overview

The MOC3051TM is a 4.17kV isolation optoisolator with triac output in a 6-DIP package, manufactured by onsemi. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The MOC3051TM provides galvanic isolation for AC switching applications with a single triac output channel and 4170Vrms isolation voltage rating.

Key Parameters

Parameter	Value
Manufacturer Part Number	MOC3051TM
Manufacturer	onsemi
Category	Optoisolators
Output Type	Triac
Voltage - Isolation	4170Vrms
Voltage - Off State	600 V
Number of Channels	1
Current - LED Trigger (Ift) (Max)	15mA
Current - Hold (Ih) (Typ)	220µA
Voltage - Forward (Vf) (Typ)	1.18V
Current - DC Forward (If) (Max)	60 mA
Static dV/dt (Min)	1kV/µs
Operating Temperature	-40°C ~ 85°C
Package / Case	6-DIP (0.400", 10.16mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MOC3051TM is determined by the following critical parameters:

Isolation Voltage: Minimum 4170Vrms (equal or higher acceptable)
Output Type: Triac output required
Number of Channels: Single channel
Package / Case: 6-DIP form factor
Mounting Type: Through Hole
Current - LED Trigger (Ift): Maximum 15mA (equal or lower acceptable)
Voltage - Off State: 600 V minimum
Static dV/dt: 1kV/µs minimum

Substitute parts are grouped into two categories:

Direct Equivalent: MOC3051TVM (onsemi) — identical electrical specifications with active product status and enhanced compliance certifications.

Similar Alternative: MOC3051G (Isocom Components 2004 LTD) and IS3052 (Isocom Components 2004 LTD) — meet or exceed isolation voltage and electrical parameters with compatible 6-DIP packaging, though with minor variations in hold current and forward voltage specifications.

Parameter Comparison

Parameter	MOC3051TM (Main)	MOC3051TVM (Direct)	MOC3051G (Similar)	IS3052 (Similar)
Manufacturer	onsemi	onsemi	Isocom Components 2004 LTD	Isocom Components 2004 LTD
Voltage - Isolation	4170Vrms	4170Vrms	5000Vrms	5000Vrms
Voltage - Off State	600 V	600 V	600 V	600 V
Number of Channels	1	1	1	1
Output Type	Triac	Triac	Triac	Triac
Current - LED Trigger (Ift) (Max)	15mA	15mA	15mA	10mA
Current - Hold (Ih) (Typ)	220µA	220µA	200µA	200µA
Voltage - Forward (Vf) (Typ)	1.18V	1.18V	1.2V	1.2V
Current - DC Forward (If) (Max)	60 mA	60 mA	50 mA	50 mA
Static dV/dt (Min)	1kV/µs	1kV/µs	1kV/µs	1kV/µs
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 100°C	-40°C ~ 100°C
Package / Case	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active
Approval Agency	UR	UR, VDE	UL, VDE	UL, VDE
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MOC3051TVM is the primary substitute for MOC3051TM. Both parts share identical electrical specifications and 6-DIP packaging. MOC3051TVM carries active product status with enhanced compliance certifications (UR and VDE approval) and ROHS3 compliance, making it suitable for new designs and production continuity.

MOC3051G and IS3052 are viable alternatives when MOC3051TVM is unavailable. Both exceed the isolation voltage requirement (5000Vrms vs. 4170Vrms) and maintain compatibility with the 6-DIP through-hole form factor. MOC3051G matches the original 0.400" DIP spacing. IS3052 uses a 0.300" DIP spacing, requiring PCB layout verification for pin-to-pin compatibility. Both alternatives carry active product status with UL and VDE certifications and ROHS3 compliance.

Selection should prioritize MOC3051TVM for direct replacement. MOC3051G serves as the secondary choice when identical onsemi sourcing is not feasible. IS3052 is acceptable where the reduced DIP spacing accommodates board layout requirements.

Frequently Asked Questions (FAQ)

Q: Can MOC3051TVM directly replace MOC3051TM without circuit modifications?

A: Yes. MOC3051TVM shares identical electrical specifications, isolation voltage, triac output characteristics, and 6-DIP packaging with MOC3051TM. No circuit modifications are required.

Q: What is the key difference between MOC3051TM and MOC3051TVM?

A: MOC3051TVM is the active production variant of the same base product (MOC305 series). Both deliver 4170Vrms isolation and identical electrical performance. MOC3051TVM includes enhanced compliance certifications (VDE approval) and ROHS3 compliance status.

Q: Are MOC3051G and IS3052 electrically compatible with MOC3051TM?

A: Both MOC3051G and IS3052 meet the electrical substitution criteria: triac output, 4170Vrms minimum isolation voltage (both rated 5000Vrms), single channel, and through-hole 6-DIP packaging. Minor parameter variations exist in hold current (200µA vs. 220µA) and forward voltage (1.2V vs. 1.18V), which remain within acceptable operating margins for triac optoisolator applications.

Q: Does the 0.300" DIP spacing of IS3052 affect PCB compatibility?

A: IS3052 uses 0.300" DIP spacing versus the standard 0.400" spacing of MOC3051TM and MOC3051G. PCB footprint verification is required before substitution. If the original design uses 0.400" DIP spacing, IS3052 will not fit without board redesign.

Q: Which substitute part has the best compliance certifications?

A: MOC3051TVM, MOC3051G, and IS3052 all carry ROHS3 compliance and dual certifications (UR/VDE or UL/VDE). All three meet current regulatory requirements for new designs.

Q: What is the operating temperature range difference?

A: MOC3051TM operates -40°C to 85°C. MOC3051G and IS3052 extend to -40°C to 100°C, providing wider thermal operating margin. MOC3051TVM maintains the original -40°C to 85°C range.

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