Grayhill 78M07S DIP Switch SPST 7-Position Equivalent & Substitute Parts

Part Overview

The Grayhill 78M07S is a slide-actuated DIP switch featuring SPST (Single Pole Single Throw) circuit configuration with 7 positions. This component is rated for 150mA at 30VDC and is designed for through-hole mounting on printed circuit boards. The 78M07S is classified as obsolete product status, making identification of functionally equivalent alternatives essential for ongoing design support, maintenance, and production continuity. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and contact characteristics to ensure direct replacement without circuit redesign.

Substiute Parts

78M07S

Grayhill Inc.In Stock: 107278M07S Datasheet

Current PartRFQ

78B07ST

Grayhill Inc.In Stock: 161878B07ST Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 78M07S is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must satisfy the following requirements:

Critical Parameters (Must Match Exactly):

• SPST circuit configuration
• 7-position switch array
• 150mA current rating
• 30VDC voltage rating
• Slide actuator type with raised actuator level
• Through-hole mounting with PC pin termination
• 0.100" (2.54mm) pitch spacing
• 0.315" (8.00mm) height above board

Important Parameters (Must Match Exactly):

• Copper alloy contact material
• Gold contact finish
• Operating temperature range of -40°C to 85°C
• Mechanical and electrical life ratings of 2,000 cycles minimum

Packaging and Compliance Considerations: Substitute parts may differ in packaging format and RoHS/REACH compliance status, provided all electrical and mechanical specifications remain identical. Product status (active versus obsolete) does not affect substitution eligibility when all functional parameters match.

Parameter Comparison

Engineering Selection Recommendations

The Grayhill 78B07ST is a direct functional equivalent to the 78M07S across all critical electrical and mechanical parameters. Selection between these parts should be based on the following engineering considerations:

Product Status Consideration: The 78M07S is classified as obsolete, while the 78B07ST maintains active product status. For new designs, ongoing production, or long-term supply chain planning, the 78B07ST is the appropriate selection due to continued manufacturer support and availability.

Compliance Status: The 78B07ST achieves RoHS3 compliance, whereas the 78M07S is RoHS non-compliant. Applications subject to RoHS regulatory requirements must use the 78B07ST. Both parts maintain REACH Unaffected status and EAR99 export classification.

Packaging Differences: The 78M07S is supplied in bulk packaging, while the 78B07ST is supplied in tube packaging. Packaging selection should align with assembly process requirements and inventory management protocols. Tube packaging typically provides improved component protection during handling and storage.

Inventory Availability: Current inventory levels show 1,557 units of 78B07ST available versus 1,048 units of 78M07S. The 78B07ST represents the preferred long-term supply source.

Frequently Asked Questions (FAQ)

Q: Can the 78B07ST directly replace the 78M07S without circuit modification?

A: Yes. The 78B07ST is electrically and mechanically identical to the 78M07S across all critical parameters including circuit configuration, current/voltage ratings, actuator type, mounting dimensions, and contact characteristics. Direct substitution on existing PCBs is supported without design changes.

Q: What is the significance of the different product status (Obsolete vs. Active)?

A: Product status indicates manufacturer support lifecycle. The 78M07S (obsolete) is no longer actively manufactured or supported by Grayhill Inc. The 78B07ST (active) continues in production with full manufacturer support, technical documentation, and supply chain availability. For new applications or long-term production, the active part is the appropriate selection.

Q: Does the RoHS compliance difference affect substitution eligibility?

A: RoHS compliance status does not affect electrical or mechanical substitution eligibility. However, applications subject to RoHS regulatory requirements (such as EU market products) must use the RoHS3-compliant 78B07ST. The choice between RoHS-compliant and non-compliant versions depends on end-product regulatory requirements, not component functionality.

Q: Are the packaging differences (bulk vs. tube) significant for substitution?

A: Packaging format does not affect component functionality or electrical performance. Packaging selection should be based on assembly process requirements, handling procedures, and inventory management practices. Tube packaging provides enhanced component protection during storage and transport compared to bulk packaging.

Q: What parameters must remain identical for substitution to be valid?

A: All critical parameters must match exactly: SPST circuit, 7 positions, 150mA current rating, 30VDC voltage rating, slide actuator type, through-hole mounting, 0.100" pitch, 0.315" height, copper alloy contacts with gold finish, -40°C to 85°C operating range, and 2,000-cycle mechanical/electrical life. Any deviation in these parameters disqualifies a part as a direct substitute.

Q: Can parts with different contact materials or finishes substitute for the 78M07S?

A: No. Contact material (copper alloy) and finish (gold) are critical parameters that determine electrical performance, reliability, and environmental resistance. Substitutes must maintain identical contact specifications.

Q: Is the 78B07ST available in the same quantity as the 78M07S?

A: Current inventory shows 1,557 units of 78B07ST available compared to 1,048 units of 78M07S. The 78B07ST represents the primary available supply source and is recommended for procurement planning.