Omron A3SA-90D1-12SY Pushbutton Switch - Equivalent & Substitute Parts

Part Overview

The Omron A3SA-90D1-12SY is a DPDT illuminated pushbutton switch designed for panel mount, snap-in installation. This component features a square yellow actuator with yellow LED illumination, rated for 3A AC / 2A DC operation at 125V AC / 30V DC. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and new design implementations where this switch type is specified.

Substiute Parts

A3SA-90D1-12SY

Omron Automation and SafetyIn Stock: 1081A3SA-90D1-12SY Datasheet

Current PartRFQ

A3SA-90D1-12EY

Omron Automation and SafetyIn Stock: 855A3SA-90D1-12EY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the A3SA-90D1-12SY is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: DPDT (Double Pole, Double Throw) - electrical switching topology must remain identical
• Switch Function: On-On operation - functional behavior must match
• Current and Voltage Ratings: 3A AC / 2A DC at 125V AC / 30V DC - electrical load capacity must meet or exceed original specifications
• Mounting Interface: Panel Mount, Snap-In with 16.20mm x 16.20mm square cutout - mechanical compatibility with existing panel installations
• Actuator and Illumination: Square yellow button with yellow LED illumination at 12V - visual and operational consistency
• Termination: Quick Connect 0.110" (2.8mm) - connector compatibility with existing wiring harnesses
• Operating Temperature and Life Ratings: -10°C to 50°C, 100,000 mechanical and electrical cycles - environmental and durability requirements

Parameter Comparison

Engineering Selection Recommendations

The A3SA-90D1-12EY is the manufacturer-recommended substitute for the obsolete A3SA-90D1-12SY. Both components are from the Omron A3S series and maintain identical electrical, mechanical, and operational specifications across all critical parameters.

The primary distinction is product status: the A3SA-90D1-12SY is obsolete, while the A3SA-90D1-12EY is active and currently in production. This substitution ensures continued availability and supply chain reliability for applications requiring DPDT illuminated pushbutton switches with the specified electrical ratings and panel mount configuration.

One operational consideration exists: the main part (A3SA-90D1-12SY) supports illumination voltage of 12 VAC/DC, while the substitute (A3SA-90D1-12EY) supports 12 VDC only. In applications where 12 VAC illumination is required, this difference must be evaluated against system design requirements.

Frequently Asked Questions (FAQ)

Q: Can the A3SA-90D1-12EY be used as a direct replacement for the A3SA-90D1-12SY in existing installations?

A: Yes, the A3SA-90D1-12EY is mechanically and electrically compatible with the A3SA-90D1-12SY. Both switches share identical panel cutout dimensions (16.20mm x 16.20mm), termination style (Quick Connect 0.110"), circuit configuration (DPDT), and electrical ratings (3A AC / 2A DC, 125V AC / 30V DC). The snap-in mounting interface is identical, allowing direct installation into existing panel assemblies.

Q: What is the difference between the illumination voltage specifications?

A: The A3SA-90D1-12SY supports 12 VAC/DC illumination, while the A3SA-90D1-12EY supports 12 VDC illumination only. If your application requires 12 VAC illumination capability, this difference must be addressed in system design. For applications using 12 VDC illumination exclusively, this distinction has no practical impact.

Q: Are the electrical switching characteristics identical between these two parts?

A: Yes. Both the A3SA-90D1-12SY and A3SA-90D1-12EY feature identical DPDT circuit configuration with On-On switch function, 3A AC / 2A DC current ratings, 125V AC / 30V DC voltage ratings, and 100,000 cycle mechanical and electrical life specifications.

Q: Why is the A3SA-90D1-12SY classified as obsolete?

A: The A3SA-90D1-12SY has been discontinued by Omron Automation and Safety. The A3SA-90D1-12EY is the active production equivalent, ensuring continued component availability and manufacturer support.

Q: Are there any certifications or compliance differences between these parts?

A: The provided specifications do not include certification or compliance information for either part. Consult Omron technical documentation or contact the manufacturer for detailed certification data if required for your application.

Q: What is the panel cutout requirement for installation?

A: Both switches require a square panel cutout of 16.20mm x 16.20mm. The snap-in mounting mechanism secures the switch directly into this opening without additional fasteners.