M2018SA1G01-BA Toggle Switch SPDT Equivalent & Substitute Parts

Part Overview

The M2018SA1G01-BA is a panel-mount toggle switch manufactured by NKK Switches, featuring SPDT (Single Pole Double Throw) circuitry with momentary-off-momentary (Mom-Off-Mom) switching function. Rated for 0.4VA at 28V AC/DC, this component is classified as obsolete. Due to its discontinued status, identifying functionally equivalent substitute parts is essential for design continuity, maintenance, and system upgrades where this switch is currently deployed.

Substiute Parts

M2018SA1G01-BA

NKK SwitchesIn Stock: 814M2018SA1G01-BA Datasheet

Current PartRFQ

7105P3HZQE

C&KIn Stock: 8687105P3HZQE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the M2018SA1G01-BA is determined by the following critical parameters:

Mandatory Matching Criteria:

• Circuit configuration: SPDT
• Switch function: Mom-Off-Mom
• Mounting type: Panel Mount
• Termination style: Solder Lug
• Bushing thread: 1/4-40
• Operating temperature range: -30°C to 85°C (minimum)

Allowable Variation Parameters:

• Current rating: Substitute must equal or exceed 0.4VA
• Voltage rating (AC/DC): Substitute must equal or exceed 28V
• Panel cutout diameter: Tolerance within mechanical assembly constraints
• Electrical life: Substitute must equal or exceed 50,000 cycles

The C&K 7105P3HZQE qualifies as a functional substitute based on matching circuit topology, switch function, mounting configuration, and termination method. While the substitute exhibits higher current and voltage ratings (5A at 120V AC), these represent design margins that do not compromise compatibility in applications rated for the original 0.4VA at 28V specification.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: C&K 7105P3HZQE

The 7105P3HZQE is functionally compatible with the M2018SA1G01-BA for applications requiring SPDT Mom-Off-Mom panel-mount toggle switching at 28V DC and 0.4VA or lower current levels. The substitute's higher current and AC voltage ratings provide design margin without introducing incompatibility.

Compliance Considerations:

The original M2018SA1G01-BA is RoHS3 compliant. The substitute 7105P3HZQE is RoHS non-compliant and REACH-affected. Systems subject to RoHS3 or REACH regulatory requirements must evaluate whether component-level compliance is mandatory for the application. If regulatory compliance is a design constraint, the substitute may not be acceptable without formal compliance documentation review.

Electrical Life Trade-off:

The substitute exhibits 40,000 electrical cycles versus the original 50,000 cycles. For applications with defined cycle-life requirements exceeding 40,000 operations, this parameter difference must be evaluated against actual duty cycle expectations.

Availability and Product Status:

The M2018SA1G01-BA is obsolete with limited inventory (753 units). The 7105P3HZQE is actively manufactured by C&K with current availability (853 units), ensuring long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 7105P3HZQE directly replace the M2018SA1G01-BA in existing assemblies?

A: Yes, for applications operating at or below 0.4VA and 28V. The substitute matches all critical mechanical and electrical parameters: SPDT circuit, Mom-Off-Mom function, panel-mount configuration, 1/4-40 bushing thread, and solder-lug termination. Panel cutout diameter tolerance (6.50mm vs. 6.35mm) is mechanically compatible within standard assembly tolerances.

Q: What is the impact of the substitute's higher current rating (5A vs. 0.4VA)?

A: Higher current rating indicates greater switching capacity. In applications limited to 0.4VA operation, the substitute operates well within its design envelope, providing additional safety margin. No adverse effects result from using a higher-rated component in a lower-demand application.

Q: Does the 40,000-cycle electrical life of the substitute affect compatibility?

A: The substitute's 40,000-cycle rating is lower than the original 50,000 cycles. For applications with documented cycle-life requirements exceeding 40,000 operations, this difference must be factored into component selection. For typical low-cycle-rate applications, this difference is not operationally significant.

Q: Are there RoHS or REACH compliance implications when substituting?

A: Yes. The original M2018SA1G01-BA is RoHS3 compliant and REACH-unaffected. The substitute 7105P3HZQE is RoHS non-compliant and REACH-affected. If the application or end-market requires RoHS3 or REACH compliance, the substitute may not meet regulatory requirements without additional compliance verification from the manufacturer.

Q: What are the mechanical differences between the two parts?

A: Panel cutout diameter differs slightly (6.50mm vs. 6.35mm). Both use identical 1/4-40 bushing threads and solder-lug termination. The 0.15mm cutout difference is within standard mechanical tolerance and does not prevent panel-mount installation. Actuator length differs marginally (12.27mm vs. 11.43mm), which does not affect functional compatibility in standard panel-mount applications.

Q: Is the substitute suitable for high-reliability or aerospace applications?

A: Component selection for high-reliability or aerospace applications requires formal qualification and compliance documentation. The substitute's RoHS non-compliance and lower electrical life rating may disqualify it from such applications. Consult application-specific requirements and manufacturer datasheets before selection.