M2T28SA5G03 Toggle Switch DPDT Equivalent & Substitute Parts

Part Overview

The M2T28SA5G03 is a DPDT (Double Pole Double Throw) toggle switch manufactured by NKK Switches, designed for through-hole mounting with a rated capacity of 0.4VA at 28V AC/DC. The switch features a momentary-off-momentary (Mom-Off-Mom) function with a standard round actuator and process-sealed construction. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar electrical and mechanical characteristics.

Substiute Parts

M2T28SA5G03

NKK SwitchesIn Stock: 1032M2T28SA5G03 Datasheet

Current PartRFQ

M2028SA2G03

NKK SwitchesIn Stock: 1006M2028SA2G03 Datasheet

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100DP4T1B4M2QE

E-SwitchIn Stock: 916100DP4T1B4M2QE Datasheet

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7205P3Y9CQE

C&KIn Stock: 30337205P3Y9CQE Datasheet

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7205SY9CGE

C&KIn Stock: 9267205SY9CGE Datasheet

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E205SD1CQE

C&KIn Stock: 1065E205SD1CQE Datasheet

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U25SY9CQI

C&KIn Stock: 1116U25SY9CQI Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the M2T28SA5G03 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration: DPDT
• Switch function: Mom-Off-Mom
• Mounting type: Through Hole
• Termination style: PC Pin
• Operating temperature range: -30°C to 85°C
• Voltage rating: Minimum 28V DC

Secondary Compatibility Criteria:

• Current rating: Equal to or greater than 0.4VA
• Actuator type: Standard Round preferred for mechanical fit
• Electrical life: Equal to or greater than 50,000 cycles

Substitute parts are grouped into two categories based on electrical performance:

Category 1 - Direct Electrical Equivalent: Parts with current ratings at or near 0.4VA and voltage ratings matching 28V specifications.

Category 2 - Higher Capacity Substitutes: Parts with current ratings of 5A or greater and voltage ratings of 120V or higher, suitable for applications where the original 0.4VA specification is conservative or where future design margin is required.

Parameter Comparison

Engineering Selection Recommendations

M2028SA2G03 (NKK Switches) is the primary direct equivalent. It maintains identical electrical specifications (0.4VA, 28V AC/DC), circuit configuration (DPDT Mom-Off-Mom), and mounting characteristics. The part is active in production status, ROHS3 compliant, and features identical operating temperature range and electrical life. Actuator length differs by 0.42mm (12.28mm vs. 12.70mm), which may require mechanical validation in space-constrained applications. This substitute is recommended for direct replacement in existing designs.

100DP4T1B4M2QE (E-Switch), 7205P3Y9CQE (C&K), 7205SY9CGE (C&K), E205SD1CQE (C&K), and U25SY9CQI (C&K) are higher-capacity alternatives with current ratings of 5A to 7.5A and AC voltage ratings of 120V to 125V. All maintain 28V DC compatibility, DPDT configuration, Mom-Off-Mom function, and through-hole PC pin termination. These parts are suitable for applications requiring design margin beyond the original 0.4VA specification. All substitute parts are ROHS3 compliant and operate within the -30°C to 85°C temperature range.

E205SD1CQE provides the highest current capacity (7.5A) and includes IP57 ingress protection (dust protected, waterproof), making it suitable for harsh environment applications. Actuator length matches the original part at 12.70mm.

Compliance Considerations: All substitute parts maintain ROHS3 compliance. C&K parts (7205P3Y9CQE, 7205SY9CGE, E205SD1CQE, U25SY9CQI) are REACH Affected, while NKK M2028SA2G03 and E-Switch 100DP4T1B4M2QE are REACH Unaffected. Selection should account for supply chain and regulatory requirements specific to the application region.

Frequently Asked Questions (FAQ)

Q: Can M2028SA2G03 be used as a direct replacement for M2T28SA5G03?

A: Yes. M2028SA2G03 is electrically and functionally equivalent with identical 0.4VA current rating, 28V voltage rating, DPDT configuration, and Mom-Off-Mom function. Both feature through-hole PC pin termination and operate across -30°C to 85°C. The actuator length differs by 0.42mm (12.28mm vs. 12.70mm), requiring mechanical fit verification in panel-mounted applications.

Q: What is the difference between the 0.4VA rated parts and the 5A/7.5A rated parts?

A: The M2T28SA5G03 and M2028SA2G03 are rated for 0.4VA at 28V, suitable for low-power signal switching applications. The 5A and 7.5A rated substitutes (E-Switch 100DP4T1B4M2QE, C&K 7205 and E205 series) are designed for higher-power applications an