Omron A3SA-90B1-12SY Pushbutton Switch - Equivalent & Substitute Parts

Part Overview

The Omron A3SA-90B1-12SY is an illuminated pushbutton switch with SPDT (Single Pole Double Throw) circuit configuration, designed for panel-mount snap-in installation. This component features a yellow LED illumination at 12 VAC/DC nominal voltage and a square yellow actuator button. The part is currently classified as obsolete, making identification of compatible substitute components essential for ongoing system maintenance and new design implementations.

Substiute Parts

A3SA-90B1-12SY

Omron Automation and SafetyIn Stock: 1007A3SA-90B1-12SY Datasheet

Current PartRFQ

A3SA-90B1-12EY

Omron Automation and SafetyIn Stock: 1112A3SA-90B1-12EY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the A3SA-90B1-12SY is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: SPDT topology must be maintained
• Switch Function: On-On operation required
• Mounting Interface: Panel Mount, Snap-In with 16.20mm x 16.20mm square cutout
• Electrical Ratings: Current (3A AC / 2A DC) and voltage (125V AC / 30V DC) must be met or exceeded
• Termination: Quick Connect - 0.110" (2.8mm) connector type
• Illumination Specifications: LED type with yellow color and 12V nominal supply voltage
• Actuator Configuration: Square button with yellow color
• Environmental Specifications: Operating temperature -10°C ~ 50°C, mechanical and electrical life of 100,000 cycles minimum

The Omron A3SA-90B1-12EY qualifies as a direct substitute based on identical compliance with all critical parameters listed above.

Parameter Comparison

Engineering Selection Recommendations

The Omron A3SA-90B1-12EY is the recommended substitute for the obsolete A3SA-90B1-12SY. The substitute part maintains active production status with Omron Automation and Safety, ensuring long-term availability and supply chain continuity. All electrical, mechanical, and dimensional specifications are equivalent between the two components.

The primary distinction is the illumination voltage specification: the original part supports both 12 VAC and 12 VDC operation, while the substitute operates on 12 VDC only. In applications where the illumination supply is DC-based, this substitution presents no functional limitation. For systems requiring 12 VAC illumination capability, the DC-only specification of the substitute must be evaluated against actual circuit requirements.

Both components share identical circuit topology (SPDT), current and voltage ratings, mechanical life ratings, and panel mounting interface specifications. The substitution is direct for panel-mount snap-in installations with 16.20mm square cutout dimensions and Quick Connect 0.110" termination.

Frequently Asked Questions (FAQ)

Q: Can the A3SA-90B1-12EY directly replace the A3SA-90B1-12SY in existing installations?

A: Yes, provided the illumination supply is DC-based. The substitute part is mechanically and electrically equivalent across all critical parameters including circuit configuration, current/voltage ratings, mounting interface, and actuator specifications. The panel cutout dimensions and termination style are identical, enabling direct physical replacement.

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

A: The original A3SA-90B1-12SY supports 12 VAC/DC illumination, while the substitute A3SA-90B1-12EY operates on 12 VDC only. If your system supplies 12 VDC to the illumination circuit, both parts are functionally equivalent. If your system requires 12 VAC illumination capability, the substitute's DC-only specification must be considered.

Q: Are the panel mounting dimensions identical?

A: Yes. Both the A3SA-90B1-12SY and A3SA-90B1-12EY require a square panel cutout of 16.20mm x 16.20mm and use snap-in mounting. No panel modification is required when substituting between these parts.

Q: Do both parts use the same termination connector?

A: Yes. Both components use Quick Connect - 0.110" (2.8mm) termination style, ensuring compatibility with existing wiring harnesses and connector assemblies.

Q: What is the reason for the part number change from SY to EY?

A: The suffix change reflects the illumination voltage specification modification from VAC/DC to DC-only. The A3SA-90B1-12EY represents an active production variant within the A3S series, while the original A3SA-90B1-12SY is now obsolete.

Q: Are the electrical ratings identical between both parts?

A: Yes. Both parts maintain identical current ratings (3A AC / 2A DC) and voltage ratings (125V AC / 30V DC). The SPDT circuit configuration and On-On switch function are also identical.

Q: What is the mechanical life expectancy for both parts?

A: Both the A3SA-90B1-12SY and A3SA-90B1-12EY are rated for 100,000 mechanical cycles and 100,000 electrical cycles, with an operating temperature range of -10°C to 50°C.