Equivalent & Substitute Parts for 78C03SRAT

Part Overview

The 78C03SRAT is a DIP slide switch manufactured by Grayhill Inc., configured as a single-pole single-throw (SPST) switch with 3 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 obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

Substiute Parts

78C03SRAT

Grayhill Inc.In Stock: 94178C03SRAT Datasheet

Current PartRFQ

78B03SRAT

Grayhill Inc.In Stock: 113078B03SRAT Datasheet

DirectRFQ

KAS2103E

E-SwitchIn Stock: 1051KAS2103E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 78C03SRAT is determined by the following critical parameters:

Circuit Configuration: SPST topology must be maintained for functional equivalence.

Number of Positions: 3-position configuration is required for direct substitution.

Mounting Type: Through-hole, right-angle mounting is mandatory for PCB compatibility.

Actuator Type: Slide (standard) actuator is required for mechanical interchangeability.

Pitch: 0.100" (2.54mm) full pitch must be preserved for footprint compatibility.

Electrical Ratings: Current and voltage ratings must meet or exceed the application requirements of 25mA at 24VDC.

Termination Style: PC pin termination is required for through-hole soldering compatibility.

Two substitute parts meet these criteria:

78B03SRAT (Grayhill Inc.): Direct manufacturer substitute with enhanced electrical ratings (150mA at 30VDC) and extended electrical life (10,000 cycles). Maintains identical mechanical form factor and mounting configuration. Product status is active.

KAS2103E (E-Switch): Cross-manufacturer substitute with identical electrical ratings (25mA at 24VDC) and matching mechanical specifications. Product status is active. Differs in body material composition and washability feature.

Parameter Comparison

Engineering Selection Recommendations

78B03SRAT Selection Criteria:

The 78B03SRAT is the preferred substitute when design specifications permit higher electrical ratings. This part maintains Grayhill Inc. manufacturing continuity and offers superior electrical life (10,000 cycles versus 2,000 cycles). The 150mA current rating and 30VDC voltage rating provide design margin for applications currently operating at 25mA and 24VDC. Extended operating temperature range (-40°C to 85°C) accommodates broader environmental conditions. ROHS3 compliance ensures current regulatory alignment. Height above board is 0.010" lower, which may require PCB layout verification in space-constrained applications.

KAS2103E Selection Criteria:

The KAS2103E is selected when maintaining identical electrical specifications (25mA at 24VDC) is required and cross-manufacturer sourcing is acceptable. This E-Switch component provides active product status and ROHS3 compliance. Operating temperature range matches the 78B03SRAT (-40°C to 85°C). The phosphor bronze contact material matches the original 78C03SRAT specification. Body material differs (polybutylene terephthalate glass-filled versus plastic), and washability is not supported. Length is 0.026" shorter, requiring verification for mechanical clearance.

Both substitute parts satisfy the core substitution criteria of SPST configuration, 3-position count, through-hole right-angle mounting, standard slide actuator, 0.100" pitch, and PC pin termination.

Frequently Asked Questions (FAQ)

Q: Can the 78B03SRAT replace the 78C03SRAT in all applications?

A: The 78B03SRAT meets all mechanical and electrical substitution criteria. The higher current rating (150mA versus 25mA) and voltage rating (30VDC versus 24VDC) provide design margin. Verify that the 0.010" reduction in height above board does not create clearance conflicts in your PCB assembly.

Q: What is the primary difference between the 78B03SRAT and KAS2103E?

A: The 78B03SRAT maintains Grayhill Inc. manufacturing and offers higher electrical ratings (150mA at 30VDC). The KAS2103E is an E-Switch product with identical electrical specifications to the original 78C03SRAT (25mA at 24VDC). Both are active products with ROHS3 compliance and extended operating temperature ranges.

Q: Are there packaging differences between these substitutes?

A: The 78C03SRAT original specification does not include packaging detail. Both 78B03SRAT and KAS2103E are supplied in tube packaging. Confirm tube quantity requirements with your procurement process.

Q: Does the KAS2103E support washable assembly processes?

A: No. The KAS2103E does not support washable assembly, whereas the 78C03SRAT original part includes tape seal washability. If your manufacturing process requires washable components, the 78B03SRAT is the appropriate selection.

Q: Are all three parts RoHS compliant?

A: Yes. The 78C03SRAT is RoHS Compliant. Both substitutes (78B03SRAT and KAS2103E) are ROHS3 Compliant, representing current regulatory standards.

Q: What is the mechanical life expectancy for these switches?

A: All three parts specify 2,000 mechanical cycles. The 78B03SRAT provides extended electrical life at 10,000 cycles, compared to 2,000 cycles for both the 78C03SRAT and KAS2103E.