Grayhill 78B05 DIP Switch SPST Equivalent & Substitute Parts

Part Overview

The Grayhill 78B05 is a 5-position DIP switch with SPST (Single Pole Single Throw) circuit configuration, rated for 150mA at 30VDC. This component features a slide actuator with standard raised level, through-hole mounting, and gold-plated copper alloy contacts. The 78B05 is classified as obsolete product status, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The primary substitute is the 78B05T, which maintains identical electrical and mechanical specifications while offering active product status and improved compliance.

Key Parameters

Parameter	Value
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)
Height Above Board	0.315" (8.00mm)
Operating Temperature Range	-40°C to 85°C
Contact Material	Copper Alloy with Gold Finish
Mechanical Life	2,000 Cycles
Electrical Life	2,000 Cycles

Substitute Part Grouping Explanation

Substitution eligibility for the Grayhill 78B05 is determined by strict adherence to the following critical parameters: circuit configuration (SPST), number of positions (5), current rating (150mA minimum), voltage rating (30VDC minimum), actuator type (slide standard), mounting type (through hole), and pitch (0.100" / 2.54mm). These parameters define the functional and physical compatibility requirements for direct substitution.

Direct Equivalent (Identical Specifications): The 78B05T from Grayhill Inc. maintains all electrical and mechanical parameters of the 78B05 while offering active product status and RoHS3 compliance. This part is packaged in tube format and represents the recommended transition path from the obsolete 78B05.

Partial Substitutes (Reduced Electrical Ratings): The CTS Electrocomponents 206-5 and C&K BD05 are listed as substitutes but operate at reduced current and/or voltage ratings. These parts maintain the same circuit configuration, position count, actuator type, mounting method, and pitch. However, they are suitable only for applications where the actual operating current and voltage requirements are within their respective ratings.

Parameter Comparison

Parameter	78B05 (Grayhill)	78B05T (Grayhill)	206-5 (CTS)	BD05 (C&K)
Manufacturer	Grayhill Inc.	Grayhill Inc.	CTS Electrocomponents	C&K
Circuit	SPST	SPST	SPST	SPST
Positions	5	5	5	5
Current Rating	150mA	150mA	50mA	100mA
Voltage Rating	30VDC	30VDC	24VDC	5VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Slide (Standard)	Slide (Standard)
Height Above Board	0.315" (8.00mm)	0.315" (8.00mm)	0.334" (8.48mm)	0.297" (7.54mm)
Pitch	0.100" (2.54mm)	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	-40°C to 85°C
Contact Material	Copper Alloy	Copper Alloy	Not Specified	Phosphor Bronze
Contact Finish	Gold	Gold	Gold	Gold
Mechanical Life	2,000 Cycles	2,000 Cycles	Not Specified	10,000 Cycles
Electrical Life	2,000 Cycles	2,000 Cycles	10,000 Cycles	10,000 Cycles
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
Packaging	Bulk	Tube	Tube	Tube

Engineering Selection Recommendations

Primary Recommendation: Grayhill 78B05T

The 78B05T is the direct equivalent of the 78B05 and is the preferred substitute. It maintains identical electrical ratings (150mA, 30VDC), mechanical specifications, and physical dimensions. The 78B05T offers active product status, ensuring long-term availability and supply chain stability. Additionally, the 78B05T achieves RoHS3 compliance, addressing regulatory requirements that the obsolete 78B05 does not meet. For applications currently using the 78B05, direct replacement with the 78B05T requires no circuit redesign or board layout modification.

Secondary Consideration: CTS Electrocomponents 206-5

The 206-5 is suitable only for applications where the actual operating current does not exceed 50mA and the operating voltage does not exceed 24VDC. While this part maintains the same form factor, pitch, and actuator configuration, the reduced electrical ratings limit its applicability. The 206-5 offers extended operating temperature range (-55°C to 85°C) and higher electrical life (10,000 cycles). Selection of the 206-5 requires verification that application requirements fall within its electrical specifications.

Tertiary Consideration: C&K BD05

The BD05 is suitable only for low-voltage applications operating at 5VDC with current not exceeding 100mA. This part features enhanced mechanical life (10,000 cycles) and electrical life (10,000 cycles) compared to the 78B05, along with washable construction capability. The BD05 uses phosphor bronze contacts and glass-filled PBT body material. Selection of the BD05 requires confirmation that the application operates within its 5VDC voltage specification.

Frequently Asked Questions (FAQ)

Q: Can the 78B05T be used as a direct replacement for the 78B05 without any modifications?

A: Yes. The 78B05T maintains identical electrical ratings (150mA, 30VDC), mechanical specifications, physical dimensions, pitch (0.100"), and height above board (0.315"). No circuit redesign or board layout changes are required. The primary difference is product status (active vs. obsolete) and RoHS compliance.

Q: What are the key differences between the 78B05 and the CTS 206-5?

A: The 206-5 operates at reduced electrical ratings: 50mA maximum current (vs. 150mA) and 24VDC maximum voltage (vs. 30VDC). Both maintain identical circuit configuration (SPST), position count (5), actuator type (slide standard), and pitch (0.100"). The 206-5 offers extended temperature range (-55°C to 85°C) and higher electrical life (10,000 cycles). The 206-5 is suitable only for applications within its electrical specifications.

Q: Is the C&K BD05 compatible with the 78B05 in terms of physical mounting?

A: The BD05 maintains compatible physical parameters: SPST circuit, 5 positions, slide standard actuator, through-hole mounting, and 0.100" pitch. However, the BD05 height above board is 0.297" (vs. 0.315" for the 78B05), representing a 0.018" difference. The BD05 is rated for 5VDC maximum voltage and 100mA maximum current, making it suitable only for low-voltage applications.

Q: What is the primary reason the 78B05 is listed as obsolete?

A: The 78B05 is classified as obsolete product status. The 78B05T provides an active, supported alternative with identical specifications and improved compliance characteristics.

Q: Can I use the 206-5 in a 30VDC application?

A: No. The 206-5 is rated for 24VDC maximum. Using it in a 30VDC application exceeds its voltage specification and is not permitted.

Q: What packaging formats are available for these substitute parts?

A: The 78B05 is supplied in bulk packaging. The 78B05T, 206-5, and BD05 are all supplied in tube packaging, which may affect procurement and handling procedures.

Q: Are all substitute parts RoHS compliant?

A: The 78B05T, 206-5, and BD05 are all RoHS3 compliant. The original 78B05 is RoHS non-compliant. For applications subject to RoHS requirements, the 78B05T is the appropriate selection.

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