Grayhill 78B05S DIP Switch Equivalent & Substitute Parts

Part Overview

The Grayhill 78B05S is a single-pole single-throw (SPST) slide DIP switch designed for through-hole mounting applications requiring 150mA at 30VDC switching capability. This component features a 5-position configuration with gold-plated copper alloy contacts and operates across the industrial temperature range of -40°C to 85°C.

The 78B05S is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	78B05S
Manufacturer	Grayhill Inc.
Circuit Configuration	SPST
Number of Positions	5
Current Rating	150mA
Voltage Rating	30VDC
Actuator Type	Slide (Standard)
Mounting Type	Through Hole
Pitch	0.100" (2.54mm)
Operating Temperature Range	-40°C to 85°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 78B05S is determined by the following critical parameters:

Primary Substitution Criteria:

Circuit configuration (SPST)
Number of positions (5)
Mounting type (Through Hole)
Pitch spacing (0.100" / 2.54mm)
Actuator type (Slide Standard)
Contact finish (Gold)

Electrical Compatibility Criteria:

Current rating must equal or exceed 150mA
Voltage rating must equal or exceed 30VDC
Operating temperature range must encompass or exceed -40°C to 85°C

Mechanical Compatibility Criteria:

Height above board and overall dimensions must be compatible with existing PCB layouts
Termination style (PC Pin) must match board design

Two substitute parts meet the core mechanical and electrical requirements with varying degrees of parameter alignment.

Parameter Comparison

Parameter	78B05S (Main)	78B05ST (Grayhill)	206-5ST (CTS)
Manufacturer	Grayhill Inc.	Grayhill Inc.	CTS Electrocomponents
Product Status	Obsolete	Active	Active
Circuit	SPST	SPST	SPST
Number of Positions	5	5	5
Current Rating	150mA	150mA	50mA
Voltage Rating	30VDC	30VDC	24VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Slide (Standard)
Actuator Level	Raised	Raised	Raised
Contact Material	Copper Alloy	Copper Alloy	Not specified
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)
Washable	Yes	Yes	Yes
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-55°C to 85°C
Mechanical Life	2,000 Cycles	2,000 Cycles	Not specified
Electrical Life	2,000 Cycles	2,000 Cycles	10,000 Cycles
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Tape	Tube	Tube

Engineering Selection Recommendations

Primary Substitute: Grayhill 78B05ST

The 78B05ST is the direct functional equivalent of the 78B05S. Both parts share identical electrical ratings (150mA, 30VDC), mechanical dimensions (0.315" height, 0.100" pitch), and operating temperature range (-40°C to 85°C). The 78B05ST is currently in active production status with 6,075 units in stock, ensuring supply availability. The 78B05ST achieves ROHS3 compliance, addressing regulatory requirements that the obsolete 78B05S does not meet. The only packaging difference is tube versus tape, which does not affect functional compatibility. The 78B05ST is the recommended direct replacement for new designs and legacy system maintenance.

Secondary Substitute: CTS 206-5ST

The CTS 206-5ST shares the same mechanical form factor (5-position SPST, through-hole, 0.100" pitch, slide actuator) and operates across an extended temperature range (-55°C to 85°C). However, the 206-5ST has reduced electrical ratings: 50mA current capacity and 24VDC voltage rating, both below the 78B05S specifications. The 206-5ST is suitable only for applications where the circuit operates at or below 50mA and 24VDC. The 206-5ST provides extended electrical life (10,000 cycles versus 2,000 cycles) and ROHS3 compliance. Selection of the 206-5ST requires verification that the application circuit does not exceed its electrical ratings.

Frequently Asked Questions (FAQ)

Q: Can the 78B05ST directly replace the 78B05S without PCB modification?

A: Yes. The 78B05ST and 78B05S are mechanically and electrically identical. Both have 0.315" height above board, 0.100" pitch spacing, and PC pin termination. No PCB layout changes are required.

Q: What is the key difference between the 78B05S and 78B05ST?

A: The 78B05ST is the active production variant of the obsolete 78B05S. Both parts are functionally identical. The 78B05ST achieves ROHS3 compliance and is available in tube packaging, while the 78B05S is non-compliant and supplied in tape packaging.

Q: Can the CTS 206-5ST replace the Grayhill 78B05S in all applications?

A: No. The 206-5ST has reduced electrical ratings (50mA at 24VDC versus 150mA at 30VDC). The 206-5ST is compatible only with circuits operating at or below 50mA and 24VDC. Applications requiring the full 150mA at 30VDC capability must use the 78B05ST.

Q: What is the height difference between the 78B05S and the CTS 206-5ST?

A: The 78B05S has a height of 0.315" (8.00mm) above board. The CTS 206-5ST has a height of 0.334" (8.48mm). This 0.019" (0.48mm) difference may affect PCB clearance in space-constrained designs.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the Grayhill 78B05ST and CTS 206-5ST are ROHS3 compliant. The original 78B05S is RoHS non-compliant.

Q: What is the inventory status of substitute parts?

A: The Grayhill 78B05ST has 6,075 units in stock. The CTS 206-5ST has 713 units in stock. Both are currently available.

Q: Does the packaging difference between tape and tube affect functionality?

A: No. Tape and tube packaging are handling and storage formats only. They do not affect the electrical or mechanical performance of the switch component.

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