Grayhill 38BM3-550 Pushbutton Switch SPST-NO Equivalent & Substitute Parts

Part Overview

The Grayhill 38BM3-550 is an active-status pushbutton switch with SPST-NO (Single Pole Single Throw - Normally Open) circuit configuration. This surface mount, right-angle component operates at 0.4VA across 20V AC/DC ratings with a sealed, fully-protected design. The part is specified for applications requiring momentary contact switching with mechanical and electrical life ratings of 80,000 cycles. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part becomes unavailable or when alternative sourcing is required.

Substiute Parts

38BM3-550

Grayhill Inc.In Stock: 112538BM3-550 Datasheet

Current PartRFQ

EP11SD1SAPE

C&KIn Stock: 2964EP11SD1SAPE Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Grayhill 38BM3-550 is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Circuit configuration: SPST-NO
• Switch function: Off-Mom (momentary contact)
• Current rating: 0.4VA (AC/DC)
• Voltage rating: 20V AC and 20V DC minimum
• Mounting type: Surface Mount, Right Angle
• Termination style: Gull Wing
• Actuator type: Round, Plunger
• Operating temperature range: -30°C to 85°C or wider
• Packaging: Tape & Reel (TR)
• RoHS compliance: ROHS3 Compliant

The C&K EP11SD1SAPE meets all mandatory matching parameters and qualifies as a direct substitute. Variations in mechanical life, electrical life, ingress protection rating, and moisture sensitivity level do not disqualify substitution when all electrical and mechanical interface parameters align.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: Grayhill 38BM3-550

The Grayhill 38BM3-550 is the specified component with active product status and full compliance to ROHS3 and REACH standards. This part carries 1114 units in current inventory and demonstrates 80,000-cycle mechanical and electrical life ratings. MSL 1 classification indicates unlimited shelf life without moisture sensitivity constraints.

Substitute Part: C&K EP11SD1SAPE

The C&K EP11SD1SAPE qualifies as a direct electrical and mechanical substitute based on matching circuit configuration, voltage ratings, current capacity, mounting type, termination style, and operating temperature range. Both parts are ROHS3 compliant and REACH unaffected. The substitute part carries 2890 units in inventory.

Specification Variances:

The C&K EP11SD1SAPE exhibits three specification differences from the primary part:

1. Electrical Life: 60,000 cycles versus 80,000 cycles on the primary part. This represents a 25% reduction in rated electrical life.

2. Ingress Protection: The substitute part specifies IP57 (dust protected, waterproof) protection, whereas the primary part does not specify an ingress protection rating. The substitute provides enhanced environmental sealing.

3. Moisture Sensitivity Level: The substitute part is classified as MSL 3 (168-hour shelf life limit) compared to MSL 1 (unlimited) on the primary part. This requires controlled storage and handling procedures during inventory management.

Selection Criteria:

Component selection between the primary and substitute part depends on application-specific requirements for electrical life cycles and moisture sensitivity handling. Both parts satisfy identical electrical switching performance, voltage/current ratings, and mechanical interface requirements. Applications with electrical cycle requirements below 60,000 cycles can utilize the substitute part without performance compromise. Applications requiring extended shelf life without moisture control or electrical cycle counts exceeding 60,000 should specify the primary Grayhill part.

Frequently Asked Questions (FAQ)

Q: Can the C&K EP11SD1SAPE replace the Grayhill 38BM3-550 in all applications?

A: The C&K EP11SD1SAPE provides electrical and mechanical compatibility for applications with electrical cycle requirements up to 60,000 cycles. Applications requiring 60,000 to 80,000 electrical cycles must use the primary Grayhill part. Both parts are functionally equivalent for momentary contact switching at 0.4VA and 20V ratings.

Q: What is the impact of the MSL 3 rating on the C&K substitute part?

A: MSL 3 classification requires storage in controlled humidity environments (typically below 30% relative humidity) with a maximum shelf life of 168 hours after moisture exposure. The primary Grayhill part with MSL 1 rating has unlimited shelf life without moisture sensitivity constraints. Component procurement and inventory management procedures must account for this difference.

Q: Are the gull wing terminations identical between both parts?

A: Both parts specify gull wing termination style and surface mount, right-angle mounting configuration. Mechanical interface compatibility is confirmed for PCB assembly processes. No design modifications are required for footprint or reflow soldering procedures.

Q: Does the IP57 rating on the substitute part affect substitution eligibility?

A: The IP57 ingress protection rating on the C&K part represents an enhanced environmental sealing specification not present on the primary part. This does not disqualify substitution; it indicates the substitute part provides equal or superior environmental protection for sealed applications.

Q: What is the difference in mechanical life between the two parts?

A: The Grayhill 38BM3-550 specifies 80,000 mechanical cycles, while the C&K EP11SD1SAPE does not provide a mechanical life specification. For applications with defined mechanical cycle requirements, the primary part provides documented performance data.

Q: Are both parts available in Tape & Reel packaging?

A: Yes. Both the Grayhill 38BM3-550 and C&K EP11SD1SAPE are supplied in Tape & Reel (TR) packaging suitable for automated assembly processes.

Q: Do both parts meet RoHS and REACH compliance requirements?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component manufacturing and distribution.