Grayhill 78B08S DIP Switch - Equivalent & Substitute Parts

Part Overview

The Grayhill 78B08S is an 8-position SPST slide DIP switch rated for 150mA at 30VDC with through-hole mounting and gold-plated copper alloy contacts. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The 78B08S features a standard slide actuator, thermoplastic body, and is rated for 2,000 mechanical and electrical cycles with operating temperatures from -40°C to 85°C.

Substiute Parts

78B08S

Grayhill Inc.In Stock: 73178B08S Datasheet

Current PartRFQ

78B08ST

Grayhill Inc.In Stock: 253978B08ST Datasheet

DirectRFQ

206-8ST

CTS ElectrocomponentsIn Stock: 18505206-8ST Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 78B08S is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration: SPST
• Number of positions: 8
• Mounting type: Through hole
• Pitch: 0.100" (2.54mm)
• Actuator type: Slide (Standard)
• Termination style: PC Pin
• Contact finish: Gold

Electrical Performance Criteria:

• Current rating: 150mA minimum
• Voltage rating: 30VDC minimum
• Operating temperature range: -40°C to 85°C minimum

Compliance Criteria:

• RoHS3 compliance required
• REACH unaffected status

The 78B08ST (Grayhill Inc.) qualifies as a direct equivalent substitute, maintaining identical electrical specifications and mechanical dimensions while offering active product status. The 206-8ST (CTS Electrocomponents) qualifies as a functional substitute with reduced electrical ratings (50mA, 24VDC) and extended electrical life (10,000 cycles), suitable for applications with lower current and voltage requirements.

Parameter Comparison

Engineering Selection Recommendations

78B08ST (Grayhill Inc.) - Primary Substitute

The 78B08ST is the recommended direct substitute for the obsolete 78B08S. Both components are manufactured by Grayhill Inc. and maintain identical electrical ratings (150mA, 30VDC), mechanical specifications, and operating temperature range. The 78B08ST is currently in active production status with 2,496 units in stock. Both parts are ROHS3 compliant and REACH unaffected. The only difference is packaging format (Tube versus Tape), which does not affect functional performance. This substitute provides seamless compatibility for direct replacement applications.

206-8ST (CTS Electrocomponents) - Functional Substitute

The 206-8ST qualifies as a functional substitute for applications with reduced electrical requirements. This component maintains the same 8-position SPST configuration, through-hole mounting, and 0.100" pitch. However, the 206-8ST is rated for 50mA at 24VDC, which is lower than the 78B08S specifications. The 206-8ST offers extended electrical life (10,000 cycles versus 2,000 cycles) and an expanded operating temperature range (-55°C to 85°C). This substitute is suitable only for circuits operating at or below 50mA and 24VDC. The 206-8ST is ROHS3 compliant and REACH unaffected. Height above board is 0.334" (8.48mm) compared to 0.315" (8.00mm) for the main part, requiring PCB layout verification.

Frequently Asked Questions (FAQ)

Q: Can the 78B08ST be used as a direct replacement for the 78B08S?

A: Yes. The 78B08ST is a direct equivalent substitute. Both components share identical electrical ratings (150mA, 30VDC), mechanical dimensions, operating temperature range (-40°C to 85°C), and contact specifications. The 78B08ST is currently in active production, making it the preferred substitute for the obsolete 78B08S.

Q: What are the limitations of using the 206-8ST as a substitute?

A: The 206-8ST has reduced electrical ratings: 50mA maximum current (versus 150mA) and 24VDC maximum voltage (versus 30VDC). This substitute is only suitable for applications operating at or below these reduced specifications. Additionally, the 206-8ST has a height above board of 0.334" (8.48mm) compared to 0.315" (8.00mm) for the 78B08S, which may require PCB layout verification for clearance compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both the 78B08ST and 206-8ST are ROHS3 compliant and REACH unaffected, matching the compliance status of the main part 78B08S.

Q: What is the difference in packaging between the 78B08S and 78B08ST?

A: The 78B08S is supplied in Tape packaging, while the 78B08ST is supplied in Tube packaging. This difference affects handling and storage but does not impact functional performance or electrical characteristics.

Q: Does the 206-8ST have the same mechanical life as the 78B08S?

A: The mechanical life specification for the 206-8ST is not provided in the available data. However, the 206-8ST does specify 10,000 electrical cycles compared to 2,000 electrical cycles for the 78B08S, indicating extended operational life in electrical switching applications.

Q: Can the 78B08S be used in applications requiring 150mA at 30VDC?

A: Yes. The 78B08S is rated for 150mA at 30VDC. However, since this part is obsolete, the 78B08ST should be used for new designs and ongoing production to ensure long-term component availability.