Equivalent & Substitute Parts for 78C08SRAT

Part Overview

The 78C08SRAT is an 8-position DIP slide switch manufactured by Grayhill Inc., rated for 25mA at 24VDC with SPST (Single Pole Single Throw) circuit configuration. This component features a through-hole, right-angle mounting design with gold-plated phosphor bronze contacts and is housed in a plastic body with raised slide actuators.

The 78C08SRAT is classified as obsolete. Locating equivalent or substitute components is necessary to support ongoing maintenance, repair, and new design requirements where this part is specified or functionally required.

Substiute Parts

78C08SRAT

Grayhill Inc.In Stock: 112378C08SRAT Datasheet

Current PartRFQ

78B08SRAT

Grayhill Inc.In Stock: 645478B08SRAT Datasheet

DirectRFQ

BD08AV

C&KIn Stock: 1959BD08AV Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 78C08SRAT are identified based on the following core compatibility criteria:

Mandatory Matching Parameters:

• Circuit configuration: SPST
• Number of positions: 8
• Mounting type: Through hole, right angle
• Pitch: 0.100" (2.54mm), full
• Termination style: PC pin
• Actuator type: Slide (standard), raised level
• Body material: Plastic
• Length: 0.880" (22.35mm)

Allowable Variation Parameters:

• Current rating: Must equal or exceed 25mA
• Voltage rating: Must equal or exceed 24VDC
• Height above board: Tolerance within mechanical design constraints
• Contact material and finish: Functionally equivalent materials acceptable
• Operating temperature range: May extend beyond -20°C to 70°C
• Mechanical and electrical life: May exceed 2,000 cycles
• Product status: Active status preferred for ongoing availability
• Compliance certifications: RoHS3 compliance acceptable as upgrade from RoHS

The substitute parts listed below satisfy these criteria and are suitable for direct replacement in applications requiring the 78C08SRAT electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

78B08SRAT (Direct Substitute - Grayhill Inc.)

The 78B08SRAT is the primary substitute for the obsolete 78C08SRAT. Both components are manufactured by Grayhill Inc. and share identical mechanical form factors, mounting configurations, and pitch specifications. The 78B08SRAT exceeds the electrical specifications of the main part with 150mA current capacity and 30VDC voltage rating, providing operational margin for the original 25mA at 24VDC requirement. The 78B08SRAT features extended electrical life (10,000 cycles versus 2,000 cycles) and an expanded operating temperature range (-40°C to 85°C). The component holds active product status with established supply chain availability. RoHS3 compliance represents an upgrade from the main part's RoHS compliance status. This substitute is suitable for direct replacement in applications where the 78C08SRAT is specified.

BD08AV (Similar Substitute - C&K)

The BD08AV from C&K is a functionally equivalent alternative that matches all mandatory mechanical and circuit parameters. This component is manufactured by a different supplier and offers extended mechanical and electrical life (10,000 cycles each). The BD08AV operates at 5VDC, which is below the original 24VDC specification and limits its application to low-voltage circuits. The BD08AV features a glass-filled PBT body material, providing enhanced mechanical durability compared to standard plastic. This substitute is suitable for applications where voltage requirements are 5VDC or lower and where extended component life is beneficial. The BD08AV holds active product status with established supply availability.

Frequently Asked Questions (FAQ)

Q: Can the 78B08SRAT directly replace the 78C08SRAT in all applications?

A: The 78B08SRAT is mechanically and electrically compatible with the 78C08SRAT. Both components share identical mounting configurations, pitch, and form factors. The 78B08SRAT exceeds the electrical specifications of the original part, providing higher current and voltage ratings. Direct replacement is suitable for applications operating at or below the original 25mA and 24VDC specifications.

Q: What are the key differences between the 78B08SRAT and BD08AV?

A: The 78B08SRAT and BD08AV differ in manufacturer, voltage rating, and body material composition. The 78B08SRAT is rated for 30VDC operation, while the BD08AV is rated for 5VDC. The BD08AV features a glass-filled PBT body material, whereas the 78B08SRAT uses standard plastic. Both components share identical mechanical dimensions and mounting specifications. Selection between these substitutes depends on circuit voltage requirements and environmental durability needs.

Q: Is the BD08AV suitable for 24VDC applications?

A: The BD08AV is rated for 5VDC operation and is not suitable for 24VDC applications. Using the BD08AV in a 24VDC circuit exceeds its voltage rating and may result in component failure or unsafe operation. For 24VDC applications, the 78B08SRAT is the appropriate substitute.

Q: What is the pitch specification, and why is it important for substitution?

A: Pitch refers to the center-to-center distance between adjacent switch positions, specified as 0.100" (2.54mm) for all listed components. Pitch is critical for PCB layout compatibility and ensures that substitute components fit within existing board designs without requiring layout modifications.

Q: Are all substitute parts RoHS compliant?

A: The 78B08SRAT and BD08AV are both ROHS3 compliant, which exceeds the RoHS compliance status of the original 78C08SRAT. ROHS3 compliance is acceptable for applications requiring RoHS compliance and represents an improvement in environmental and regulatory standards.

Q: What is the difference between mechanical life and electrical life?

A: Mechanical life refers to the number of actuator cycles the switch can withstand before mechanical degradation occurs. Electrical life refers to the number of electrical switching cycles the contact system can perform before electrical degradation occurs. The 78C08SRAT is rated for 2,000 cycles for both parameters, while the 78B08SRAT and BD08AV offer extended electrical life ratings of 10,000 cycles.

Q: Can the 78C08SRAT be used interchangeably with the 78B08SRAT in reverse applications?

A: The 78C08SRAT cannot replace the 78B08SRAT in applications requiring the higher electrical specifications of the 78B08SRAT. The 78C08SRAT is limited to 25mA at 24VDC and 2,000 electrical cycles. Applications designed for the 78B08SRAT's 150mA at 30VDC capability would be undersupported by the 78C08SRAT.

Q: What packaging options are available for substitute parts?

A: The 78B08SRAT and BD08AV are supplied in tube packaging. Tube packaging is standard for DIP switch components and is suitable for both manual and automated assembly processes.

Q: Are the substitute parts washable?

A: Both the 78B08SRAT and BD08AV are washable components, matching the washability specification of the original 78C08SRAT. This feature allows for post-assembly cleaning processes without component degradation.