Omron A3SJ-90A1-12SW Pushbutton Switch - Equivalent & Substitute Parts

Part Overview

The Omron A3SJ-90A1-12SW is an illuminated SPDT pushbutton switch designed for panel mount, snap-in installation. This component features a white rectangular button actuator with white LED illumination at 12 VAC/DC nominal voltage. The switch is rated for 3A AC at 125V and 2A DC at 30V, with a quick connect 0.110" (2.8mm) termination style.

The A3SJ-90A1-12SW is classified as obsolete. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications requiring this switch configuration.

Key Parameters

Parameter	Value
Circuit Configuration	SPDT (Single Pole Double Throw)
Switch Function	On-Momentary
Current Rating (AC)	3A at 125V
Current Rating (DC)	2A at 30V
Mounting Type	Panel Mount, Snap-In
Actuator Type	Rectangular Button
Illumination	LED, White
Illumination Voltage	12 VAC/DC
Termination Style	Quick Connect - 0.110" (2.8mm)
Panel Cutout Dimensions	Rectangular - 22.40mm x 16.20mm
Operating Temperature Range	-10°C to 50°C
Mechanical Life	1,000,000 Cycles
Electrical Life	100,000 Cycles
Ingress Protection	IP00

Substitute Part Grouping Explanation

Substitution of the A3SJ-90A1-12SW is determined by strict equivalence across the following critical parameters:

Circuit Configuration: SPDT topology must be maintained
Switch Function: On-Momentary operation required
Current and Voltage Ratings: 3A AC / 125V and 2A DC / 30V compliance mandatory
Mounting and Mechanical Interface: Panel mount, snap-in with 22.40mm x 16.20mm rectangular cutout
Actuator and Illumination: White rectangular button with white LED illumination
Termination: Quick connect 0.110" (2.8mm) connectors
Environmental Specifications: Operating temperature -10°C to 50°C, mechanical life 1,000,000 cycles, electrical life 100,000 cycles

The substitute part must match all these parameters without deviation to ensure direct replacement capability.

Parameter Comparison

Parameter	A3SJ-90A1-12SW (Original)	A3SJ-90A1-12EW (Substitute)
Manufacturer	Omron Automation and Safety	Omron Automation and Safety
Series	A3S	A3S
Product Status	Obsolete	Active
Circuit Configuration	SPDT	SPDT
Switch Function	On-Momentary	On-Momentary
Current Rating (AC)	3A at 125V	3A at 125V
Current Rating (DC)	2A at 30V	2A at 30V
Mounting Type	Panel Mount, Snap-In	Panel Mount, Snap-In
Actuator Type	Rectangular Button	Rectangular Button
Actuator Color	White	White
Illumination Type	LED, White	LED, White
Illumination Voltage	12 VAC/DC	12 VDC
Termination Style	Quick Connect - 0.110" (2.8mm)	Quick Connect - 0.110" (2.8mm)
Panel Cutout Dimensions	Rectangular - 22.40mm x 16.20mm	Rectangular - 22.40mm x 16.20mm
Operating Temperature	-10°C to 50°C	-10°C to 50°C
Mechanical Life	1,000,000 Cycles	1,000,000 Cycles
Electrical Life	100,000 Cycles	100,000 Cycles
Ingress Protection	IP00	IP00

Engineering Selection Recommendations

The A3SJ-90A1-12EW is the manufacturer-recommended substitute for the obsolete A3SJ-90A1-12SW. Both components are from the Omron A3S series and maintain identical electrical and mechanical specifications across all critical parameters.

The primary distinction is product status: the original part is obsolete, while the substitute is active. This transition ensures continued availability and supply chain support for new designs and ongoing production requirements.

The illumination voltage specification differs slightly: the original supports 12 VAC/DC, while the substitute is specified for 12 VDC. In applications utilizing 12 VDC illumination, the A3SJ-90A1-12EW provides direct compatibility. For applications requiring 12 VAC illumination capability, this difference must be evaluated against specific circuit requirements.

All other parameters—circuit topology, current and voltage ratings, mechanical interface, actuator configuration, termination style, and environmental specifications—are identical between the two parts.

Frequently Asked Questions (FAQ)

Q: Can the A3SJ-90A1-12EW replace the A3SJ-90A1-12SW in existing designs?

A: Yes. Both parts share identical SPDT circuit configuration, 3A AC / 2A DC current ratings, 125V AC / 30V DC voltage ratings, panel mount snap-in interface, and mechanical specifications. The substitute is the manufacturer-recommended replacement for the obsolete original.

Q: What is the difference in illumination voltage specification?

A: The original A3SJ-90A1-12SW supports 12 VAC/DC illumination, while the A3SJ-90A1-12EW is specified for 12 VDC. Applications using 12 VDC illumination will operate identically. Applications requiring 12 VAC illumination capability should verify circuit compatibility with the 12 VDC specification of the substitute.

Q: Are the panel cutout dimensions identical?

A: Yes. Both parts require a rectangular panel cutout of 22.40mm x 16.20mm. No mechanical modification to existing panel installations is necessary.

Q: Do both parts use the same termination connectors?

A: Yes. Both the A3SJ-90A1-12SW and A3SJ-90A1-12EW use quick connect 0.110" (2.8mm) termination. Existing wiring harnesses and connector assemblies are compatible without modification.

Q: What is the mechanical and electrical life expectancy?

A: Both parts are rated for 1,000,000 mechanical cycles and 100,000 electrical cycles under specified operating conditions (-10°C to 50°C).

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