Grayhill 78RB05S DIP Switch Equivalent & Substitute Parts

Part Overview

The Grayhill 78RB05S is a slide-actuated DIP switch featuring SPST (Single Pole Single Throw) configuration with 5 positions, rated for 150mA at 30VDC. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The part employs through-hole mounting with PC pin termination and gold-plated copper alloy contacts suitable for washable applications.

Substiute Parts

78RB05S

Grayhill Inc.In Stock: 100178RB05S Datasheet

Current PartRFQ

78RB05ST

Grayhill Inc.In Stock: 611678RB05ST Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 78RB05S is determined by strict equivalence across the following critical parameters: circuit configuration (SPST), position count (5), current rating (150mA), voltage rating (30VDC), actuator type (slide standard), mounting method (through hole), pitch spacing (0.100"), physical height (0.265"), contact material composition (copper alloy with gold finish), and operating temperature range (-40°C to 85°C).

The Grayhill 78RB05ST qualifies as a direct substitute based on complete alignment with all specified electrical and mechanical parameters. The primary distinction between these parts is product status and packaging format, not functional capability.

Parameter Comparison

Engineering Selection Recommendations

The 78RB05ST is the appropriate selection for new designs and procurement activities. This part maintains complete functional equivalence to the 78RB05S across all electrical and mechanical specifications while offering the advantage of active product status and RoHS3 compliance. The transition from the obsolete 78RB05S to the 78RB05ST presents no circuit-level compatibility issues, as all critical parameters remain identical.

For existing designs currently utilizing the 78RB05S, direct substitution with the 78RB05ST is permissible without circuit modification. The packaging difference (tube format for 78RB05ST versus standard packaging for 78RB05S) affects only procurement and handling procedures, not functional performance or board-level integration.

Frequently Asked Questions (FAQ)

Q: Are the 78RB05S and 78RB05ST electrically interchangeable?

A: Yes. Both parts share identical electrical specifications: SPST configuration, 5 positions, 150mA current rating, and 30VDC voltage rating. No circuit modifications are required for substitution.

Q: What is the significance of the product status difference?

A: The 78RB05S is classified as obsolete, indicating discontinued manufacturing and limited availability. The 78RB05ST maintains active production status, ensuring reliable long-term procurement and supply chain continuity.

Q: Does the RoHS compliance difference affect compatibility?

A: RoHS3 compliance of the 78RB05ST represents an environmental and regulatory advantage over the non-compliant 78RB05S. From a functional standpoint, this difference does not impact electrical or mechanical performance in the circuit.

Q: Are the physical dimensions identical?

A: Yes. Both parts feature identical height above board (0.265"), length (0.580"), and pitch spacing (0.100"). PCB layout and mounting hole patterns are identical.

Q: What is the difference in packaging?

A: The 78RB05ST is supplied in tube packaging, while the 78RB05S uses standard packaging. This affects only procurement, storage, and handling procedures. Functional performance is unaffected.

Q: Can the 78RB05ST be used as a direct replacement in existing assemblies?

A: Yes. The 78RB05ST functions as a direct replacement for the 78RB05S in all applications. No design changes, PCB modifications, or firmware updates are necessary.

Q: Are the contact materials and finishes the same?

A: Yes. Both parts employ copper alloy contacts with gold plating, ensuring identical electrical performance and washability characteristics.