FODM3051R2 Optoisolator Triac Output Equivalent & Substitute Parts

Part Overview

The FODM3051R2 is a 3.75kV isolation optoisolator with triac output manufactured by onsemi in a 4-SMD surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part delivers 1-channel triac isolation suitable for AC switching applications requiring high voltage isolation and fast switching performance.

Key Parameters

Parameter	Value
Voltage - Isolation	3750Vrms
Voltage - Off State	600V
Output Type	Triac
Number of Channels	1
Current - LED Trigger (Ift) (Max)	15mA
Current - On State (It (RMS)) (Max)	70mA
Static dV/dt (Min)	1kV/µs
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Operating Temperature	-40°C ~ 100°C

Substitute Part Grouping Explanation

Substitution eligibility for the FODM3051R2 is determined by the following critical parameters:

Voltage isolation rating of 3750Vrms minimum
Triac output configuration with single channel
4-SMD surface mount package compatibility
Off-state voltage rating of 600V or higher
Operating temperature range encompassing -40°C to 100°C

The three substitute parts listed below meet these core electrical and mechanical requirements. Variations in LED trigger current (Ift), on-state current (It), and static dV/dt ratings represent acceptable performance differences within the optoisolator triac category and do not preclude substitution when application requirements permit.

Parameter Comparison

Parameter	FODM3051R2	FODM3053R2V-NF098	S2S3LA0F	S2S5A00F
Manufacturer	onsemi	onsemi	SHARP/Socle Technology	SHARP/Socle Technology
Product Status	Obsolete	Active	Active	Active
Voltage - Isolation	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Voltage - Off State	600V	600V	600V	600V
Output Type	Triac	Triac	Triac	Triac
Number of Channels	1	1	1	1
Current - LED Trigger (Ift) (Max)	15mA	5mA	5mA	10mA
Current - On State (It (RMS)) (Max)	70mA	70mA	50mA	50mA
Current - Hold (Ih)	300µA (Typ)	300µA (Typ)	4.6mA	4.6mA
Static dV/dt (Min)	1kV/µs	1kV/µs	100V/µs	500V/µs
Voltage - Forward (Vf) (Typ)	1.2V	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	60mA	60mA	50mA	50mA
Operating Temperature	-40°C ~ 100°C	-40°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD	4-SMD, Gull Wing
Packaging Type	-	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®
RoHS Status	-	ROHS3 Compliant	RoHS Compliant	RoHS Compliant

Engineering Selection Recommendations

FODM3053R2V-NF098 (onsemi): This part maintains onsemi manufacturer continuity and matches the original FODM3051R2 across all critical isolation, voltage, and temperature parameters. Product status is active with ROHS3 compliance. The reduced LED trigger current (5mA vs. 15mA) represents improved efficiency. Approval agencies include cUR, UR, and VDE. This substitute is the closest functional equivalent.

S2S3LA0F (SHARP/Socle Technology): This part meets isolation and voltage requirements with active product status and RoHS compliance. Operating temperature range is -30°C to 100°C, which covers most industrial applications but does not extend to -40°C. Static dV/dt is 100V/µs, lower than the original specification. On-state current is 50mA versus 70mA. Approval agencies are CSA and UR.

S2S5A00F (SHARP/Socle Technology): This part offers the highest inventory availability (27,720 pcs) and active product status with RoHS compliance. Static dV/dt is 500V/µs, providing intermediate performance between S2S3LA0F and the original. Operating temperature range is -30°C to 100°C. On-state current is 50mA. Approval agencies are CSA and UR. Packaging is available in Cut Tape and Digi-Reel formats.

Selection should prioritize FODM3053R2V-NF098 for designs requiring exact parameter matching and onsemi sourcing continuity. S2S5A00F and S2S3LA0F are viable alternatives when temperature range relaxation to -30°C minimum is acceptable and when SHARP/Socle Technology sourcing is permissible.

Frequently Asked Questions (FAQ)

Q: Can FODM3053R2V-NF098 be used as a direct replacement for FODM3051R2?

A: Yes. Both parts share identical isolation voltage (3750Vrms), off-state voltage (600V), output type (triac), channel count (1), forward voltage (1.2V), and operating temperature range (-40°C to 100°C). The primary difference is reduced LED trigger current (5mA vs. 15mA), which improves input efficiency. Package and mounting type are identical.

Q: What is the key difference between the onsemi and SHARP/Socle Technology substitutes?

A: FODM3053R2V-NF098 maintains onsemi sourcing and matches the original -40°C lower temperature limit. S2S5A00F and S2S3LA0F are SHARP/Socle Technology parts with -30°C minimum operating temperature. All three meet the 3750Vrms isolation requirement and triac output configuration.

Q: Are there package compatibility concerns when substituting?

A: FODM3051R2, FODM3053R2V-NF098, and S2S5A00F all use 4-SMD Gull Wing packages. S2S3LA0F uses 4-SMD package without specified gull wing designation. PCB footprint compatibility should be confirmed for S2S3LA0F. All parts

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