Grayhill 78B02 DIP Switch Equivalent & Substitute Parts

Part Overview

The Grayhill 78B02 is a single-pole single-throw (SPST) slide DIP switch rated for 150mA at 30VDC with a 2-position configuration. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 78B02 features a through-hole mounting configuration with gold-plated copper alloy contacts and operates across a temperature range of -40°C to 85°C. Identifying compatible alternatives ensures design flexibility while maintaining electrical and mechanical performance requirements.

Key Parameters

Parameter	Value
Circuit Configuration	SPST (Single-Pole Single-Throw)
Number of Positions	2
Current Rating	150mA
Voltage Rating	30VDC
Actuator Type	Slide (Standard)
Mounting Type	Through Hole
Pitch	0.100" (2.54mm)
Contact Material	Copper Alloy
Contact Finish	Gold
Operating Temperature	-40°C to 85°C
Height Above Board	0.315" (8.00mm)
Mechanical Life	2,000 Cycles
Electrical Life	2,000 Cycles
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the Grayhill 78B02 is determined by strict alignment of electrical and mechanical parameters. The primary substitute is the 78B02T from Grayhill Inc., which maintains identical electrical specifications (SPST, 2-position, 150mA, 30VDC) and mechanical configuration (through-hole, 0.100" pitch, slide actuator). The 78B02T differs only in packaging (tube format) and product status (active), making it a direct functional equivalent with improved availability.

The 206-2 from CTS Electrocomponents and BD02 from C&K represent partial substitutes with electrical parameter deviations. These parts maintain the core circuit topology (SPST, 2-position), mounting method (through-hole), and pitch (0.100"), but operate at reduced current and voltage ratings. The 206-2 is rated for 50mA at 24VDC, while the BD02 is rated for 100mA at 5VDC. These substitutes are applicable only in applications where the actual operating current and voltage remain within their respective ratings.

Key substitution criteria:

Circuit configuration (SPST)
Number of positions (2)
Mounting type (through-hole)
Pitch spacing (0.100")
Actuator style (slide, standard)
Operating current and voltage (must not exceed part ratings)

Parameter Comparison

Parameter	78B02 (Main)	78B02T	206-2	BD02
Manufacturer	Grayhill Inc.	Grayhill Inc.	CTS Electrocomponents	C&K
Series	78	78	206	BD
Circuit	SPST	SPST	SPST	SPST
Positions	2	2	2	2
Current Rating	150mA	150mA	50mA	100mA
Voltage Rating	30VDC	30VDC	24VDC	5VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Slide (Standard)	Slide (Standard)
Actuator Level	Raised	Raised	Raised	Raised
Height Above Board	0.315" (8.00mm)	0.315" (8.00mm)	0.334" (8.48mm)	0.297" (7.54mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Contact Material	Copper Alloy	Copper Alloy	Not Specified	Phosphor Bronze
Contact Finish	Gold	Gold	Gold	Gold
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-55°C to 85°C	-40°C to 85°C
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 Substitute: Grayhill 78B02T

The 78B02T is the recommended direct replacement for the obsolete 78B02. Both parts maintain identical electrical ratings (150mA, 30VDC, SPST, 2-position) and mechanical specifications (through-hole, 0.100" pitch, slide actuator, 0.315" height). The 78B02T is currently in active production status with significantly higher inventory availability (11,487 pcs vs. 991 pcs). The 78B02T achieves ROHS3 compliance, whereas the original 78B02 is non-compliant. Packaging differs (tube vs. bulk), but this does not affect electrical or mechanical performance. The 78B02T is suitable for direct PCB layout substitution without design modification.

Secondary Substitutes: CTS 206-2 and C&K BD02

The CTS 206-2 and C&K BD02 are applicable only in applications where operating parameters fall within their respective electrical ratings. The 206-2 operates at 50mA maximum and 24VDC maximum, making it suitable for low-current, low-voltage applications. The BD02 operates at 100mA maximum and 5VDC maximum, suitable for digital logic and low-voltage control circuits. Both parts maintain the same circuit topology, mounting configuration, and pitch as the 78B02, ensuring PCB footprint compatibility. However, applications requiring the full 150mA at 30VDC capability of the 78B02 cannot use these substitutes.

Compliance Considerations

All substitute parts (78B02T, 206-2, BD02) are ROHS3 compliant and REACH unaffected, providing regulatory alignment for new designs. The original 78B02 is RoHS non-compliant and should be phased out in favor of compliant alternatives.

Frequently Asked Questions (FAQ)

Q: Can the 78B02T be used as a direct replacement for the 78B02 without PCB redesign?

A: Yes. The 78B02T maintains identical electrical specifications (150mA, 30VDC, SPST, 2-position) and mechanical dimensions (through-hole, 0.100" pitch, 0.315" height, slide actuator). No PCB layout modification is required. The only difference is packaging format (tube vs. bulk) and improved product status (active vs. obsolete).

Q: What are the limitations of using the CTS 206-2 as a substitute?

A: The 206-2 is rated for 50mA at 24VDC, compared to the 78B02's 150mA at 30VDC. It can only be used in applications where the actual operating current does not exceed 50mA and the applied voltage does not exceed 24VDC. The 206-2 offers extended electrical life (10,000 cycles vs. 2,000 cycles) and wider operating temperature range (-55°C to 85°C vs. -40°C to 85°C).

Q: What are the limitations of using the C&K BD02 as a substitute?

A: The BD02 is rated for 100mA at 5VDC, making it suitable only for low-voltage digital and logic applications. It cannot be used in circuits requiring 30VDC operation or currents exceeding 100mA. The BD02 offers superior mechanical and electrical life (10,000 cycles each vs. 2,000 cycles) and includes washable construction capability.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 78B02T, 206-2, and BD02 are all ROHS3 compliant. The original 78B02 is RoHS non-compliant and should be replaced in new designs to meet regulatory requirements.

Q: How do the mechanical life ratings compare?

A: The 78B02 and 78B02T are rated for 2,000 mechanical cycles. The 206-2 and BD02 are rated for 10,000 mechanical cycles, providing extended operational life in high-cycle applications.

Q: What is the difference between the 78B02 and 78B02T packaging?

A: The 78B02 is supplied in bulk packaging, while the 78B02T is supplied in tube packaging. This affects handling and storage but does not impact electrical or mechanical performance. Tube packaging provides better component protection during shipment and storage.

Q: Can multiple substitute parts be used interchangeably in the same design?

A: No. Each substitute part has distinct electrical ratings. The 78B02T is the only true direct replacement. The 206-2 and BD02 are partial substitutes applicable only to specific low-current or low-voltage applications. Mixing different substitute parts in the same circuit design is not recommended unless each application point is individually verified against the respective part's electrical ratings.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message