Equivalent & Substitute Parts for Grayhill 78C08RAT DIP Switch

Part Overview

The Grayhill 78C08RAT is an 8-position DIP switch featuring SPST (Single Pole Single Throw) circuit configuration with slide actuator, rated for 25mA at 24VDC. This component is classified as obsolete, necessitating identification of active substitute parts for new designs and ongoing production requirements. The 78C08RAT remains available in inventory but alternative solutions are required for long-term component sourcing strategy.

Substiute Parts

78C08RAT

Grayhill Inc.In Stock: 107078C08RAT Datasheet

Current PartRFQ

78B08RAT

Grayhill Inc.In Stock: 125478B08RAT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 78C08RAT is determined by strict compatibility across the following electrical and mechanical parameters:

Mandatory Compatibility Criteria:

• Circuit configuration: SPST
• Number of positions: 8
• Mounting type: Through Hole, Right Angle
• Pitch: 0.100" (2.54mm), Full
• Actuator type: Slide (Standard), Raised level
• Termination style: PC Pin
• Body material: Plastic

Allowable Parameter Variations: Substitute parts may exceed the original specifications in current rating, voltage rating, operating temperature range, electrical life, and mechanical life. These parameters represent enhanced or equivalent performance characteristics that do not compromise form-fit-function compatibility.

The 78B08RAT qualifies as a direct substitute based on identical mechanical configuration and circuit topology, with superior electrical performance ratings.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: Grayhill 78B08RAT

The 78B08RAT is the recommended substitute for the obsolete 78C08RAT. This part maintains identical form-fit-function compatibility while providing enhanced electrical performance specifications. The 78B08RAT is currently in active production status, ensuring long-term availability and supply chain continuity.

Compliance and Certification: Both parts maintain RoHS compliance status. The 78B08RAT achieves ROHS3 compliance, representing current regulatory alignment. Both components are REACH unaffected and classified under ECCN EAR99 with identical HTSUS coding (8536.50.9065), confirming regulatory equivalence.

Performance Enhancement: The 78B08RAT provides superior electrical ratings (150mA at 30VDC versus 25mA at 24VDC) and extended electrical life (10,000 cycles versus 2,000 cycles), supporting applications with higher switching demands. The expanded operating temperature range (-40°C to 85°C) accommodates broader environmental conditions compared to the original specification (-20°C to 70°C).

Physical Compatibility: Height above board differs by 0.010 inches (0.26mm), representing negligible variance within standard PCB design tolerances. All other mechanical parameters, including pitch, length, and mounting configuration, are identical.

Frequently Asked Questions (FAQ)

Q: Can the 78B08RAT be used as a direct replacement for the 78C08RAT in existing designs?

A: Yes. The 78B08RAT maintains identical circuit configuration (SPST), position count (8), mounting type (Through Hole, Right Angle), pitch (0.100"), and actuator characteristics. The 0.010-inch height difference is within standard PCB design tolerances and does not affect form-fit-function compatibility.

Q: What are the key differences between these two parts?

A: The 78B08RAT provides enhanced electrical performance with 150mA current rating (versus 25mA), 30VDC voltage rating (versus 24VDC), and 10,000-cycle electrical life (versus 2,000 cycles). Operating temperature range is expanded to -40°C to 85°C. The 78B08RAT is in active production while the 78C08RAT is obsolete.

Q: Are there any compliance or certification differences?

A: Both parts are RoHS compliant and REACH unaffected. The 78B08RAT achieves ROHS3 compliance, representing current regulatory standards. Both share identical ECCN and HTSUS classifications.

Q: Does the contact material difference affect performance?

A: Both parts feature gold-finished contacts. The 78C08RAT uses phosphor bronze while the 78B08RAT uses copper alloy. Both materials with gold plating provide equivalent electrical performance and reliability for the specified applications.

Q: What is the packaging difference?

A: The 78C08RAT is supplied without specified packaging notation. The 78B08RAT is supplied in tube packaging, which is standard for DIP switch distribution and does not affect component functionality.

Q: Can the 78B08RAT handle the original 25mA at 24VDC application?

A: Yes. The 78B08RAT is rated for 150mA at 30VDC, which exceeds the original 25mA at 24VDC requirement. The substitute part operates safely within the original application parameters.

Q: Is the 78B08RAT suitable for applications requiring the full -20°C to 70°C temperature range?

A: Yes. The 78B08RAT operating range of -40°C to 85°C fully encompasses the original -20°C to 70°C specification, providing additional thermal margin.