Equivalent & Substitute Parts for 78C05SRAT

Part Overview

The 78C05SRAT is a DIP slide switch manufactured by Grayhill Inc., configured as a single-pole single-throw (SPST) switch with 5 positions. This component is rated for 25mA at 24VDC and features a through-hole, right-angle mounting configuration with gold-plated phosphor bronze contacts. The product is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

78C05SRAT

Grayhill Inc.In Stock: 104978C05SRAT Datasheet

Current PartRFQ

78B05SRAT

Grayhill Inc.In Stock: 100778B05SRAT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 78B05SRAT qualifies as a direct substitute based on the following alignment of critical parameters:

Matching Parameters:

• Circuit configuration: SPST (single-pole single-throw)
• Number of positions: 5
• Actuator type: Slide (Standard), raised level
• Mounting configuration: Through hole, right angle
• Pitch spacing: 0.100" (2.54mm), full
• Termination style: PC pin
• Contact finish: Gold plated
• Washable design with tape seal
• Mechanical life: 2,000 cycles
• Moisture sensitivity level: 1 (Unlimited)
• RoHS compliance and REACH unaffected status

Enhanced Electrical Ratings: The 78B05SRAT provides superior electrical performance with 150mA current rating (versus 25mA) and 30VDC voltage rating (versus 24VDC), making it suitable for applications requiring the original 78C05SRAT specifications while offering additional capacity margin.

Product Status Advantage: The 78B05SRAT maintains active product status, ensuring continued availability and manufacturing support compared to the obsolete 78C05SRAT.

Parameter Comparison

Engineering Selection Recommendations

The 78B05SRAT is the appropriate substitute for the obsolete 78C05SRAT based on the following engineering criteria:

Compliance and Regulatory Status: Both components maintain identical ECCN classification (EAR99) and REACH unaffected status. The 78B05SRAT achieves ROHS3 compliance, representing current regulatory alignment compared to the RoHS compliant 78C05SRAT.

Functional Compatibility: The identical circuit configuration (SPST), position count (5), actuator type (slide standard), and mechanical dimensions (0.100" pitch, through-hole right-angle mounting) ensure direct functional substitution without PCB redesign or mechanical rework.

Electrical Performance: The 78B05SRAT's enhanced current rating (150mA versus 25mA) and voltage rating (30VDC versus 24VDC) provide operational margin for the original 78C05SRAT application specifications. The extended electrical life (10,000 cycles versus 2,000 cycles) and broader operating temperature range (-40°C to 85°C versus -20°C to 70°C) support long-term reliability.

Product Lifecycle: Selection of the active 78B05SRAT ensures continued manufacturing availability, technical support, and procurement stability compared to the obsolete 78C05SRAT.

Frequently Asked Questions (FAQ)

Q: Can the 78B05SRAT directly replace the 78C05SRAT without PCB modifications?

A: Yes. Both components share identical mounting type (through hole, right angle), pitch spacing (0.100"), termination style (PC pin), and physical length (0.580"). The height above board differs by 0.010" (0.26mm), which does not require PCB layout changes for standard applications.

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

A: The 78B05SRAT provides higher current capacity (150mA versus 25mA) and voltage rating (30VDC versus 24VDC). Applications designed for the 78C05SRAT specifications operate within the 78B05SRAT's electrical envelope. The 78B05SRAT also offers extended electrical life (10,000 cycles versus 2,000 cycles).

Q: Are there contact material differences, and do they affect compatibility?

A: The 78C05SRAT uses phosphor bronze contacts while the 78B05SRAT uses copper alloy contacts. Both are gold-plated and suitable for low-signal switching applications. Contact material selection does not affect functional substitution for standard DIP switch applications.

Q: What is the operating temperature range difference?

A: The 78C05SRAT operates from -20°C to 70°C, while the 78B05SRAT operates from -40°C to 85°C. The 78B05SRAT supports extended temperature applications and provides additional thermal margin for the original specification range.

Q: Does the packaging format differ between these parts?

A: The 78C05SRAT is supplied without specified packaging notation, while the 78B05SRAT is supplied in tube packaging. This difference affects procurement and handling but does not impact electrical or mechanical performance.

Q: Are both components RoHS compliant?

A: Yes. The 78C05SRAT is RoHS compliant, and the 78B05SRAT is ROHS3 compliant, representing current regulatory standards. Both maintain REACH unaffected status and identical ECCN classification (EAR99).

Q: What is the mechanical life specification for both parts?

A: Both components specify 2,000 mechanical cycles. The 78B05SRAT provides superior electrical life at 10,000 cycles compared to 2,000 cycles for the 78C05SRAT.