Grayhill 78B04S DIP Switch SPST Equivalent & Substitute Parts

Part Overview

The Grayhill 78B04S is a 4-position DIP switch with SPST (Single Pole Single Throw) circuit configuration, rated for 150mA at 30VDC. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design support and procurement. The 78B04S features a slide actuator with raised level, gold-plated copper alloy contacts, and through-hole PC pin termination suitable for standard PCB assembly processes.

Key Parameters

Parameter	Value
Manufacturer Part Number	78B04S
Manufacturer	Grayhill Inc.
Circuit Configuration	SPST
Number of Positions	4
Current Rating	150mA
Voltage Rating	30VDC
Actuator Type	Slide (Standard)
Mounting Type	Through Hole
Termination Style	PC Pin
Operating Temperature Range	-40°C to 85°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 78B04S is determined by the following critical parameters: circuit configuration (SPST), number of positions (4), mounting type (through hole), termination style (PC pin), pitch (0.100"), and actuator type (slide standard). Electrical ratings including current and voltage must meet or exceed the original specification to ensure functional compatibility in the target application.

Two substitute parts have been identified based on these criteria:

78B04ST (Grayhill Inc.) — Direct manufacturer equivalent with identical electrical and mechanical specifications. Product status is active with expanded inventory availability.

206-4ST (CTS Electrocomponents) — Alternative manufacturer substitute with matching circuit, position count, mounting, and termination characteristics. Electrical ratings differ: 50mA at 24VDC versus the original 150mA at 30VDC specification.

Parameter Comparison

Parameter	78B04S (Main Part)	78B04ST (Substitute)	206-4ST (Substitute)
Manufacturer	Grayhill Inc.	Grayhill Inc.	CTS Electrocomponents
Circuit Configuration	SPST	SPST	SPST
Number of Positions	4	4	4
Current Rating	150mA	150mA	50mA
Voltage Rating	30VDC	30VDC	24VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Slide (Standard)
Actuator Level	Raised	Raised	Raised
Contact Finish	Gold	Gold	Gold
Height Above Board	0.315" (8.00mm)	0.315" (8.00mm)	0.334" (8.48mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Termination Style	PC Pin	PC Pin	PC Pin
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-55°C to 85°C
Electrical Life	2,000 Cycles	2,000 Cycles	10,000 Cycles
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

78B04ST is the primary substitute for the obsolete 78B04S. This part maintains identical electrical specifications (150mA, 30VDC), mechanical dimensions, and contact characteristics. The 78B04ST is manufactured by Grayhill Inc. with active product status and ROHS3 compliance. Inventory availability is significantly higher (4,215 units) compared to the original part (852 units). No design modifications are required for direct substitution.

206-4ST serves as an alternative substitute when application requirements permit reduced electrical ratings. This CTS Electrocomponents part operates at 50mA and 24VDC, representing a downgrade from the original 150mA and 30VDC specification. The 206-4ST offers extended electrical life (10,000 cycles versus 2,000 cycles) and broader operating temperature range (-55°C to 85°C). This substitute is suitable only for applications where the lower current and voltage ratings are compatible with circuit design parameters. The 206-4ST is ROHS3 compliant with active product status and high inventory availability (15,885 units).

Frequently Asked Questions (FAQ)

Q: Can the 78B04ST directly replace the 78B04S without PCB modifications?

A: Yes. The 78B04ST maintains identical pitch (0.100"), height above board (0.315"), and PC pin termination. No PCB layout changes are required.

Q: What are the key differences between 78B04ST and 206-4ST?

A: The 78B04ST preserves the original 150mA/30VDC electrical rating and 2,000-cycle electrical life. The 206-4ST reduces electrical ratings to 50mA/24VDC but extends electrical life to 10,000 cycles and operating temperature range to -55°C to 85°C. Substitution with 206-4ST requires verification that application current and voltage demands do not exceed 50mA and 24VDC.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both 78B04ST and 206-4ST are ROHS3 compliant, matching the original 78B04S compliance status.

Q: What is the packaging difference between the main part and substitutes?

A: The 78B04S is supplied in standard packaging. Both 78B04ST and 206-4ST are supplied in tube packaging, which is standard for active production parts.

Q: Which substitute should be selected for new designs?

A: The 78B04ST is recommended for new designs requiring the original electrical specifications. The 206-4ST is suitable for applications with lower current and voltage requirements and where extended electrical life is beneficial.

Q: Is the 78B04S still available for procurement?

A: The 78B04S is classified as obsolete. Current inventory of 852 units may be available through authorized distributors, but long-term availability is not guaranteed. The 78B04ST is the recommended active-status alternative.

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