Grayhill 78M09S DIP Switch Equivalent & Substitute Parts

Part Overview

The Grayhill 78M09S is a 9-position DIP switch with SPST (Single Pole Single Throw) circuit configuration, rated for 150mA at 30VDC. This component features a slide actuator with standard raised level, gold-plated copper alloy contacts, and through-hole PC pin termination. The 78M09S is classified as obsolete product status, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning.

Substiute Parts

78M09S

Grayhill Inc.In Stock: 120978M09S Datasheet

Current PartRFQ

78B09ST

Grayhill Inc.In Stock: 576778B09ST Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 78M09S is determined by strict equivalence across the following critical parameters:

Electrical Parameters: Circuit configuration (SPST), number of positions (9), current rating (150mA), and voltage rating (30VDC) must be identical.

Mechanical Parameters: Actuator type (slide standard), mounting method (through hole), pitch spacing (0.100"), and contact material/finish (copper alloy with gold plating) must match exactly.

Environmental Parameters: Operating temperature range (-40°C to 85°C), mechanical life (2,000 cycles), and electrical life (2,000 cycles) establish functional equivalence.

Physical Dimensions: Height above board (0.315"), length (0.980"), and termination style (PC pin) must be consistent with PCB layout requirements.

The 78B09ST meets all substitution criteria as an active product variant within the same Grayhill 78 series, maintaining complete electrical and mechanical compatibility with the obsolete 78M09S.

Parameter Comparison

Engineering Selection Recommendations

The 78B09ST serves as the direct functional equivalent to the obsolete 78M09S. All electrical, mechanical, and dimensional parameters are identical, ensuring drop-in compatibility in existing PCB designs.

Product Status Consideration: The 78M09S is classified as obsolete, while the 78B09ST maintains active product status with Grayhill Inc. This distinction is significant for long-term supply chain planning and design lifecycle management.

Regulatory Compliance: The 78B09ST achieves RoHS3 compliance, whereas the 78M09S is RoHS non-compliant. For applications subject to RoHS directives or customer requirements mandating RoHS compliance, the 78B09ST is the appropriate selection.

Packaging Difference: The 78B09ST is supplied in tube packaging, compared to standard packaging for the 78M09S. Packaging format does not affect electrical or mechanical performance and is determined by procurement and assembly process requirements.

Inventory and Availability: The 78B09ST maintains significantly higher inventory levels (5,753 pieces) compared to the 78M09S (1,151 pieces), supporting improved procurement reliability and lead time performance.

Frequently Asked Questions (FAQ)

Q: Can the 78B09ST replace the 78M09S in existing designs without PCB modification?

A: Yes. The 78B09ST is electrically and mechanically identical to the 78M09S. All critical parameters including pin pitch (0.100"), height above board (0.315"), current rating (150mA), voltage rating (30VDC), and circuit configuration (SPST 9-position) are equivalent. No PCB layout changes are required.

Q: What is the significance of the product status difference between obsolete and active?

A: Product status indicates manufacturing and support lifecycle. The 78M09S (obsolete) is no longer in active production, while the 78B09ST (active) continues standard manufacturing. For new designs or long-term production runs, the active 78B09ST is the appropriate selection to ensure sustained supply availability.

Q: Does RoHS3 compliance of the 78B09ST affect electrical performance compared to the non-compliant 78M09S?

A: No. RoHS compliance status reflects material composition and manufacturing process adherence to environmental regulations. Electrical performance, current rating, voltage rating, and contact characteristics remain identical between both parts.

Q: Are there packaging considerations when transitioning from 78M09S to 78B09ST?

A: The 78B09ST is supplied in tube packaging versus standard packaging for the 78M09S. Tube packaging is compatible with standard pick-and-place assembly equipment and does not affect component performance. Packaging selection is determined by assembly process requirements and inventory management practices.

Q: What operating conditions are supported by both the 78M09S and 78B09ST?

A: Both parts operate across the identical temperature range of -40°C to 85°C with mechanical and electrical life ratings of 2,000 cycles. Contact material (copper alloy with gold finish) and washable design (tape seal) provide equivalent reliability and environmental resistance.

Q: Is the 78B09ST suitable for applications previously using the 78M09S?

A: Yes. The 78B09ST is a direct functional equivalent with identical electrical specifications, mechanical dimensions, and environmental ratings. It is suitable for all applications previously using the 78M09S, with the added benefit of active product status and RoHS3 compliance.