Equivalent & Substitute Parts for Grayhill 78C02RAT DIP Switch

Part Overview

The Grayhill 78C02RAT is a slide-actuated DIP switch with SPST (Single Pole Single Throw) configuration, rated for 25mA at 24VDC. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The 78C02RAT series remains in inventory but is no longer manufactured, making substitute part selection critical for system continuity and long-term component availability.

Substiute Parts

78C02RAT

Grayhill Inc.In Stock: 110178C02RAT Datasheet

Current PartRFQ

78B02RAT

Grayhill Inc.In Stock: 87878B02RAT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 78C02RAT are identified based on strict compatibility criteria within the Grayhill 78-series DIP switch family. The primary substitute, Grayhill 78B02RAT, shares the following critical parameters:

Matching Parameters:

• Circuit configuration: SPST (Single Pole Single Throw)
• Number of positions: 2
• Actuator type: Slide (Standard), Raised level
• Mounting type: Through Hole, Right Angle
• Pitch: 0.100" (2.54mm), Full
• Termination style: PC Pin
• Contact finish: Gold
• Body material: Plastic
• Washable: No
• Moisture Sensitivity Level: 1 (Unlimited)
• Compliance: RoHS and REACH compliant

Differing Parameters (Allowable for Substitution): The 78B02RAT provides enhanced electrical performance with higher current rating (150mA versus 25mA), higher voltage rating (30VDC versus 24VDC), extended operating temperature range (-40°C to 85°C versus -20°C to 70°C), and increased electrical life (10,000 cycles versus 2,000 cycles). These differences represent performance improvements suitable for applications requiring the 78C02RAT specifications.

Parameter Comparison

Engineering Selection Recommendations

The Grayhill 78B02RAT is the direct substitute for the obsolete 78C02RAT. Selection of the 78B02RAT is based on the following engineering criteria:

Product Status: The 78C02RAT is obsolete with no ongoing manufacturing. The 78B02RAT maintains active production status, ensuring long-term component availability and supply chain continuity.

Compliance Certifications: Both parts maintain RoHS compliance. The 78B02RAT carries ROHS3 certification, representing current regulatory compliance standards. Both parts are REACH unaffected and carry EAR99 ECCN classification.

Electrical Performance: The 78B02RAT provides enhanced electrical specifications (150mA at 30VDC) that exceed the 78C02RAT requirements (25mA at 24VDC). Applications designed for the 78C02RAT operate within the 78B02RAT electrical envelope without modification.

Mechanical Compatibility: Both parts share identical pitch (0.100"), termination style (PC Pin), and mounting configuration (Through Hole, Right Angle). PCB layout and mechanical integration remain unchanged.

Environmental Performance: The 78B02RAT extends the operating temperature range to -40°C to 85°C, providing broader environmental coverage than the 78C02RAT (-20°C to 70°C).

Lifecycle Considerations: The 78B02RAT offers extended electrical life (10,000 cycles) compared to the 78C02RAT (2,000 cycles), supporting applications with higher switching frequency requirements.

Frequently Asked Questions (FAQ)

Q: Can the 78B02RAT directly replace the 78C02RAT in existing designs?

A: Yes. The 78B02RAT maintains identical mechanical footprint, pitch, mounting type, and termination style. PCB layout and connector interfaces require no modification. The enhanced electrical ratings (150mA at 30VDC) are backward compatible with applications specified for 25mA at 24VDC.

Q: What are the key differences between these parts?

A: The 78B02RAT provides higher current rating (150mA versus 25mA), higher voltage rating (30VDC versus 24VDC), extended operating temperature range (-40°C to 85°C versus -20°C to 70°C), and increased electrical life (10,000 cycles versus 2,000 cycles). The 78C02RAT uses Phosphor Bronze contacts while the 78B02RAT uses Copper Alloy contacts. Both maintain gold finish and identical mechanical dimensions.

Q: Why is the 78C02RAT obsolete?

A: The 78C02RAT is classified as obsolete by Grayhill Inc., indicating discontinued manufacturing. The 78B02RAT represents the active equivalent within the 78-series product line.

Q: Are there packaging differences?

A: The 78C02RAT is supplied in bulk packaging. The 78B02RAT is supplied in tube packaging. Both maintain identical component specifications and performance characteristics.

Q: What compliance standards apply to both parts?

A: Both parts are RoHS compliant, REACH unaffected, and classified as EAR99 for export control purposes. The 78B02RAT carries ROHS3 certification, representing current regulatory compliance. Moisture Sensitivity Level is 1 (Unlimited) for both parts.

Q: Are the mechanical life ratings identical?

A: Both parts specify 2,000 mechanical cycles. The 78B02RAT provides extended electrical life at 10,000 cycles compared to 2,000 cycles for the 78C02RAT.

Q: What is the pitch specification for both parts?

A: Both parts maintain 0.100" (2.54mm) full pitch, ensuring identical PCB layout compatibility and connector spacing.