Equivalent & Substitute Parts for Grayhill 78C05RAT DIP Switch

Part Overview

The Grayhill 78C05RAT is a slide-actuated DIP switch with SPST (Single Pole Single Throw) configuration, rated for 25mA at 24VDC. This component is classified as Obsolete product status. Due to discontinuation, equivalent substitute parts with enhanced electrical ratings and extended operational life are available from the same manufacturer series. Substitute identification is based on matching circuit topology, mechanical form factor, and mounting compatibility while accommodating higher electrical performance specifications.

Substiute Parts

78C05RAT

Grayhill Inc.In Stock: 92678C05RAT Datasheet

Current PartRFQ

78B05RAT

Grayhill Inc.In Stock: 77378B05RAT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute identification for the 78C05RAT is based on the following critical parameters that define functional equivalence:

Matching Parameters (Required for Substitution):

• Circuit topology: SPST configuration
• Number of positions: 5-position DIP switch
• Actuator type: Slide (Standard) with raised level
• Mounting method: Through Hole, Right Angle
• Pitch spacing: 0.100" (2.54mm), Full
• Termination style: PC Pin
• Contact finish: Gold plating

Enhanced Parameters in Substitute (Acceptable Upgrades):

• Current rating: 150mA (exceeds 25mA requirement)
• Voltage rating: 30VDC (exceeds 24VDC requirement)
• Electrical life: 10,000 Cycles (exceeds 2,000 Cycles)
• Operating temperature range: -40°C to 85°C (extends -20°C to 70°C)
• Product status: Active (versus Obsolete)

The 78B05RAT substitute maintains identical mechanical and circuit characteristics while providing superior electrical performance and extended operational life, making it suitable for direct replacement in applications requiring the 78C05RAT.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 78B05RAT

The Grayhill 78B05RAT is the direct substitute for the obsolete 78C05RAT. Selection is based on the following engineering criteria:

Product Status Alignment: The 78B05RAT maintains Active product status, ensuring continued availability, manufacturing support, and supply chain stability. The 78C05RAT is classified as Obsolete, making the 78B05RAT the appropriate long-term solution.

Compliance and Certifications: Both parts maintain equivalent compliance profiles:

• RoHS compliance (78C05RAT: RoHS Compliant; 78B05RAT: ROHS3 Compliant)
• REACH Status: REACH Unaffected (both parts)
• ECCN classification: EAR99 (both parts)
• HTSUS code: 8536.50.9065 (both parts)

Electrical Performance: The 78B05RAT provides enhanced electrical specifications (150mA at 30VDC versus 25mA at 24VDC) while maintaining identical circuit topology and mechanical form factor. Applications operating within the original 78C05RAT electrical envelope (25mA, 24VDC) are fully compatible with the 78B05RAT.

Mechanical Compatibility: Identical mounting configuration, pitch spacing, and actuator design ensure direct PCB-level compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the 78B05RAT directly replace the 78C05RAT on existing PCBs?

A: Yes. The 78B05RAT maintains identical mechanical dimensions, pitch spacing (0.100"), mounting type (Through Hole, Right Angle), and circuit configuration (SPST, 5-position). No PCB layout modifications are required. The height above board differs by 0.010" (0.26mm), which is within standard PCB tolerance and does not affect functionality.

Q: What are the key differences between these parts?

A: The primary differences are electrical ratings and operational life. The 78B05RAT is rated for 150mA at 30VDC with 10,000 electrical cycles, compared to the 78C05RAT rated for 25mA at 24VDC with 2,000 electrical cycles. The 78B05RAT also supports an extended operating temperature range (-40°C to 85°C versus -20°C to 70°C).

Q: Is the 78B05RAT suitable for applications originally designed for the 78C05RAT?

A: Yes. The 78B05RAT provides superior electrical performance and extended operational life. Applications operating within the original electrical specifications (25mA, 24VDC) are fully compatible. The enhanced ratings provide additional design margin and extended component life.

Q: What is the contact material difference between these parts?

A: The 78C05RAT uses Phosphor Bronze contacts, while the 78B05RAT uses Copper Alloy contacts. Both are finished with gold plating. This material difference supports the 78B05RAT's higher current rating and extended electrical life.

Q: Are there packaging differences?

A: The 78C05RAT is supplied in standard packaging, while the 78B05RAT is supplied in Tube packaging. This does not affect component functionality or PCB-level compatibility.

Q: What is the compliance status of both parts?

A: Both parts are RoHS compliant, REACH unaffected, and classified as EAR99 for export control purposes. The 78B05RAT carries ROHS3 compliance, representing the current regulatory standard.

Q: Why is the 78C05RAT classified as Obsolete?

A: The 78C05RAT has been discontinued by Grayhill Inc. The 78B05RAT represents the active product line continuation with enhanced specifications and extended availability.