Grayhill 78RB08S DIP Switch Equivalent & Substitute Parts

Part Overview

The Grayhill 78RB08S is an 8-position DIP switch with SPST (Single Pole Single Throw) circuit configuration, rated for 150mA at 30VDC. This component features a slide actuator with standard (flush, recessed) positioning and is designed for through-hole mounting on printed circuit boards.

The 78RB08S carries an Obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance and repairs.

Substiute Parts

78RB08S

Grayhill Inc.In Stock: 100178RB08S Datasheet

Current PartRFQ

78RB08ST

Grayhill Inc.In Stock: 129478RB08ST Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 78RB08S is determined by strict equivalence across the following critical parameters:

Electrical Parameters: Circuit type (SPST), number of positions (8), current rating (150mA), and voltage rating (30VDC) must be identical.

Mechanical Parameters: Actuator type (Slide Standard), actuator level (Flush, Recessed), mounting method (Through Hole), pitch spacing (0.100"), and height above board (0.265") 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.

Contact & Termination: Contact material (Copper Alloy), contact finish (Gold), and termination style (PC Pin) must be consistent.

The Grayhill 78RB08ST meets all these criteria and qualifies as a direct substitute for the 78RB08S.

Parameter Comparison

Engineering Selection Recommendations

The Grayhill 78RB08ST is the direct functional equivalent of the 78RB08S. All electrical, mechanical, and environmental specifications are identical. The 78RB08ST is the preferred selection for new designs and component replacement due to its Active product status.

The 78RB08ST offers RoHS3 compliance, whereas the 78RB08S is RoHS non-compliant. For applications subject to RoHS regulations or environmental compliance requirements, the 78RB08ST provides regulatory advantage.

Both parts maintain identical REACH and ECCN classifications. Packaging differs between the two parts: the 78RB08S is supplied in bulk format, while the 78RB08ST is supplied in tube packaging. Packaging selection should be based on inventory management and assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can the 78RB08ST be used as a direct replacement for the 78RB08S in existing designs?

A: Yes. The 78RB08ST is electrically and mechanically identical to the 78RB08S. All functional parameters, including circuit configuration, current and voltage ratings, actuator type, mounting dimensions, and operating temperature range are equivalent. Direct substitution is supported without design modification.

Q: What is the difference between the 78RB08S and 78RB08ST?

A: The primary differences are product status and regulatory compliance. The 78RB08S is Obsolete, while the 78RB08ST is Active. The 78RB08ST is RoHS3 compliant, whereas the 78RB08S is RoHS non-compliant. Packaging also differs: 78RB08S is supplied in bulk, and 78RB08ST is supplied in tube format. All electrical and mechanical specifications are identical.

Q: Does the packaging difference between 78RB08S and 78RB08ST affect component performance?

A: No. Packaging format (bulk versus tube) does not affect electrical performance, mechanical function, or reliability. Packaging selection is based on supply chain logistics, inventory management, and assembly process requirements.

Q: Are there any compliance or regulatory differences between these parts?

A: The 78RB08ST is RoHS3 compliant, while the 78RB08S is RoHS non-compliant. Both parts are REACH Unaffected and carry identical ECCN (EAR99) and HTSUS classifications. For applications requiring RoHS compliance, the 78RB08ST is the appropriate selection.

Q: What is the mechanical life specification for these DIP switches?

A: Both the 78RB08S and 78RB08ST are rated for 2,000 mechanical cycles and 2,000 electrical cycles. This specification defines the expected operational lifespan under normal switching conditions.

Q: Are these parts suitable for washable PCB assembly processes?

A: Yes. Both the 78RB08S and 78RB08ST are rated as washable and feature tape seal protection, making them compatible with aqueous and semi-aqueous cleaning processes used in modern PCB assembly.