Grayhill 78B02S DIP Switch Equivalent & Substitute Parts

Part Overview

The Grayhill 78B02S 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 standard slide actuator with gold-plated copper alloy contacts and operates across an industrial temperature range of -40°C to 85°C.

The 78B02S carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy systems utilizing this component.

Substiute Parts

78B02S

Grayhill Inc.In Stock: 72278B02S Datasheet

Current PartRFQ

78B02ST

Grayhill Inc.In Stock: 936378B02ST Datasheet

DirectRFQ

206-2ST

CTS ElectrocomponentsIn Stock: 6626206-2ST Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 78B02S are identified based on strict electrical and mechanical parameter compatibility within DIP switch component specifications. The substitution logic follows these criteria:

Primary Substitution Criteria:

• Circuit configuration: SPST topology
• Number of positions: 2-position operation
• Actuator type: Slide (Standard) mechanism
• Mounting method: Through-hole PCB mounting
• Pitch spacing: 0.100" (2.54mm) full pitch
• Contact finish: Gold plating
• Washable design capability
• Termination style: PC pin configuration

Substitute Parts Identified:

1. 78B02ST (Grayhill Inc.) — Direct manufacturer equivalent with identical electrical ratings (150mA, 30VDC), matching mechanical dimensions, and active product status with RoHS3 compliance.

2. 206-2ST (CTS Electrocomponents) — Cross-manufacturer substitute with reduced electrical ratings (50mA, 24VDC) and extended electrical life specification (10,000 cycles), suitable for applications within these lower parameter boundaries.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Electrical Performance):

The Grayhill 78B02ST is the primary substitute for the obsolete 78B02S. Both components share identical electrical ratings (150mA, 30VDC), mechanical dimensions, and operational characteristics. The 78B02ST maintains active product status and achieves RoHS3 compliance, addressing regulatory requirements for new designs or production continuity. This part is available in tube packaging with substantial inventory (9,256 pieces in stock).

For Reduced-Load Applications:

The CTS Electrocomponents 206-2ST functions as a substitute for applications operating within reduced electrical parameters (50mA maximum, 24VDC maximum). This cross-manufacturer part offers extended electrical life (10,000 cycles versus 2,000 cycles) and an expanded lower operating temperature range (-55°C minimum). The 206-2ST is RoHS3 compliant and carries active product status. Physical dimensions differ slightly (height 0.334" versus 0.315", length 0.286" versus 0.280"), requiring PCB layout verification before implementation.

Compliance Considerations:

Both substitute parts achieve RoHS3 compliance and REACH unaffected status, supporting modern regulatory requirements. The obsolete 78B02S does not meet current RoHS standards, making substitution necessary for new production or systems requiring regulatory certification.

Frequently Asked Questions (FAQ)

Q: Can the 78B02ST directly replace the 78B02S without circuit modifications?

A: Yes. The 78B02ST provides identical electrical ratings (150mA, 30VDC), matching mechanical dimensions, and equivalent operational characteristics. No circuit modifications are required. The primary difference is product status (active versus obsolete) and RoHS3 compliance of the 78B02ST.

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

A: The 206-2ST operates at reduced electrical ratings: 50mA maximum current (versus 150mA) and 24VDC maximum voltage (versus 30VDC). Applications must operate within these lower boundaries. Physical dimensions differ slightly in height (0.334" versus 0.315") and length (0.286" versus 0.280"), requiring PCB layout verification. Use this part only for applications with electrical requirements below the 206-2ST specifications.

Q: Are there packaging differences between the substitute parts?

A: Both substitute parts are supplied in tube packaging. The 78B02S original part number does not specify packaging format in available documentation. The 78B02ST and 206-2ST are both tube-packaged, suitable for automated assembly processes.

Q: Do the substitute parts maintain the same mechanical life rating?

A: The 78B02ST maintains the same mechanical life specification (2,000 cycles) as the 78B02S. The 206-2ST does not provide a mechanical life specification in available documentation, though it specifies 10,000 electrical life cycles, exceeding both other parts.

Q: What is the temperature operating range difference between substitutes?

A: The 78B02S and 78B02ST both operate from -40°C to 85°C. The 206-2ST extends the lower temperature limit to -55°C, providing broader low-temperature capability. All three parts share the same 85°C upper temperature limit.

Q: Are moisture sensitivity levels equivalent across all three parts?

A: The 78B02S and 78B02ST both specify MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. The 206-2ST specifies MSL as Not Applicable, indicating different moisture handling characteristics. For applications with strict moisture control requirements, verify compatibility with your specific environmental conditions.

Q: Which substitute should be selected for new product designs?

A: For new designs requiring 150mA at 30VDC, select the Grayhill 78B02ST. It provides identical electrical performance, active product status, RoHS3 compliance, and established supply availability. For designs with reduced electrical requirements (≤50mA, ≤24VDC), the CTS 206-2ST offers extended electrical life and broader temperature range, with the caveat of physical dimension differences requiring layout verification.