Equivalent & Substitute Parts for 78M05S

Part Overview

The 78M05S is a DIP slide switch manufactured by Grayhill Inc., configured as a single-pole single-throw (SPST) device with 5 positions. This component is rated for 150mA at 30VDC and features through-hole mounting with gold-plated copper alloy contacts. The 78M05S is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

78M05S

Grayhill Inc.In Stock: 106978M05S Datasheet

Current PartRFQ

78B05ST

Grayhill Inc.In Stock: 610078B05ST Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 78M05S is determined by strict equivalence across the following critical parameters:

Electrical Parameters: Circuit configuration (SPST), number of positions (5), current rating (150mA), and voltage rating (30VDC) must remain identical.

Mechanical Parameters: Actuator type (Slide Standard), contact material (Copper Alloy), contact finish (Gold), mounting type (Through Hole), termination style (PC Pin), and pitch (0.100" / 2.54mm) must match exactly.

Environmental Parameters: Operating temperature range (-40°C to 85°C), mechanical life (2,000 cycles), and electrical life (2,000 cycles) must be maintained.

Physical Dimensions: Height above board (0.315" / 8.00mm) and length (0.580" / 14.73mm) must be equivalent.

The 78B05ST meets all these criteria and is identified as a direct substitute for the obsolete 78M05S.

Parameter Comparison

Engineering Selection Recommendations

The 78B05ST is the direct functional equivalent of the obsolete 78M05S. All electrical, mechanical, and dimensional parameters are identical, ensuring drop-in compatibility in existing circuit designs and PCB layouts.

Product Status Consideration: The 78M05S is obsolete, while the 78B05ST is active. The 78B05ST provides ongoing availability and supply chain continuity for new production and field replacements.

Compliance Advantage: The 78B05ST is ROHS3 compliant, whereas the 78M05S is RoHS non-compliant. For applications subject to RoHS regulations, the 78B05ST satisfies compliance requirements while maintaining full electrical and mechanical equivalence.

Packaging Difference: The 78M05S is supplied without specified packaging, while the 78B05ST is supplied in tube packaging. This difference does not affect electrical or mechanical performance and relates only to procurement and handling logistics.

Both parts share identical REACH and ECCN classifications, confirming regulatory equivalence for export and supply chain purposes.

Frequently Asked Questions (FAQ)

Q: Can the 78B05ST be used as a direct replacement for the 78M05S in existing designs?

A: Yes. The 78B05ST is electrically and mechanically identical to the 78M05S across all critical parameters: SPST circuit, 5 positions, 150mA current rating, 30VDC voltage rating, slide actuator, gold-plated copper alloy contacts, through-hole mounting, and identical physical dimensions. No design modifications are required.

Q: What is the primary reason to transition from 78M05S to 78B05ST?

A: The 78M05S is obsolete, creating supply and long-term availability risks. The 78B05ST is an active product from the same manufacturer and series, ensuring reliable procurement for current and future production. Additionally, the 78B05ST is ROHS3 compliant, addressing regulatory requirements that the obsolete 78M05S does not meet.

Q: Are there any differences in performance or reliability between these parts?

A: No. Both parts have identical mechanical life (2,000 cycles), electrical life (2,000 cycles), operating temperature range (-40°C to 85°C), and all functional specifications. Performance and reliability characteristics are equivalent.

Q: Does the tube packaging of the 78B05ST affect compatibility?

A: No. Packaging format affects only procurement, storage, and handling. It does not impact electrical performance, mechanical fit, or circuit functionality. The 78B05ST will function identically to the 78M05S when installed on a PCB.

Q: Is the 78B05ST suitable for applications requiring RoHS compliance?

A: Yes. The 78B05ST is ROHS3 compliant, making it suitable for applications and markets with RoHS requirements. The obsolete 78M05S is RoHS non-compliant and should not be used in new designs subject to RoHS regulations.

Q: Are there any export or regulatory restrictions on the 78B05ST?

A: No. The 78B05ST carries the same ECCN (EAR99) and HTSUS (8536.50.9065) classifications as the 78M05S, indicating no additional export restrictions or regulatory barriers.