Grayhill 78B09S DIP Switch – Equivalent & Substitute Parts

Part Overview

The Grayhill 78B09S is a 9-position slide-actuated DIP switch with SPST circuit configuration, rated for 150mA at 30VDC. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The 78B09S features through-hole mounting with gold-plated copper alloy contacts, thermoplastic housing, and washable construction suitable for industrial and commercial applications.

Substiute Parts

78B09S

Grayhill Inc.In Stock: 109878B09S Datasheet

Current PartRFQ

78B09ST

Grayhill Inc.In Stock: 576778B09ST Datasheet

DirectRFQ

206-9ST

CTS ElectrocomponentsIn Stock: 876206-9ST Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 78B09S is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration (SPST)
• Number of positions (9)
• Actuator type (Slide, Standard)
• Mounting type (Through Hole)
• Pitch spacing (0.100" / 2.54mm)
• Termination style (PC Pin)

Secondary Compatibility Criteria:

• Current rating (must equal or exceed 150mA)
• Voltage rating (must equal or exceed 30VDC)
• Height above board (mechanical fit tolerance)
• Contact material and finish (gold-plated copper alloy preferred)

Identified Substitutes:

78B09ST (Grayhill Inc.) – Direct manufacturer equivalent with identical electrical and mechanical specifications. Primary difference is active product status and RoHS3 compliance.

206-9ST (CTS Electrocomponents) – Cross-manufacturer alternative with matching form factor and circuit configuration. Electrical ratings are reduced (50mA at 24VDC), requiring application-level verification for current and voltage margin compatibility.

Parameter Comparison

Engineering Selection Recommendations

78B09ST (Grayhill Inc.) – Recommended Primary Substitute

The 78B09ST is the direct functional equivalent of the 78B09S. Electrical specifications are identical (150mA at 30VDC), mechanical dimensions are identical, and circuit configuration matches exactly. The 78B09ST holds active product status and carries ROHS3 compliance certification, addressing regulatory requirements for new designs. Packaging is supplied in tube format. This substitute requires no application-level re-qualification and is suitable for direct replacement in existing designs.

206-9ST (CTS Electrocomponents) – Secondary Substitute with Constraints

The 206-9ST provides form-factor and circuit compatibility but operates at reduced electrical ratings (50mA at 24VDC versus 150mA at 30VDC). This substitute is applicable only in applications where circuit current demand does not exceed 50mA and operating voltage does not exceed 24VDC. The 206-9ST offers extended electrical life (10,000 cycles versus 2,000 cycles) and extended operating temperature range (-55°C to 85°C). Height above board is 0.334" (8.48mm), representing a 0.019" increase over the main part, which may require PCB layout verification for clearance. ROHS3 compliance is confirmed. Selection of this substitute requires explicit verification that application electrical requirements fall within the reduced ratings.

Frequently Asked Questions (FAQ)

Q: Can the 78B09ST be used as a direct replacement for the 78B09S?

A: Yes. The 78B09ST is electrically and mechanically identical to the 78B09S. Both components feature 9-position SPST configuration, 150mA at 30VDC ratings, 0.100" pitch, through-hole mounting, and identical physical dimensions. The primary difference is product status (78B09ST is active) and RoHS compliance (78B09ST is ROHS3 compliant). No circuit redesign or PCB modification is required.

Q: What are the limitations of the 206-9ST as a substitute?

A: The 206-9ST has reduced electrical ratings: 50mA maximum current (versus 150mA) and 24VDC maximum voltage (versus 30VDC). This substitute is only suitable for applications operating within these reduced parameters. Additionally, the 206-9ST height above board is 0.334" compared to 0.315" for the main part, requiring verification of PCB clearance. Contact material specification is not provided for the 206-9ST.

Q: Are there packaging differences between the substitutes?

A: Yes. The 78B09S is supplied in bulk packaging, while both 78B09ST and 206-9ST are supplied in tube packaging. Tube packaging may affect procurement quantities and handling procedures but does not affect component functionality or electrical performance.

Q: Does the 206-9ST offer any performance advantages?

A: The 206-9ST provides extended electrical life (10,000 cycles versus 2,000 cycles) and extended operating temperature range (-55°C to 85°C versus -40°C to 85°C). These advantages apply only if application electrical requirements fall within the 50mA and 24VDC limits.

Q: What compliance certifications apply to each substitute?

A: The 78B09S is RoHS non-compliant. Both 78B09ST and 206-9ST carry ROHS3 compliance certification. All three components are REACH Unaffected and classified under ECCN EAR99. For new designs subject to RoHS requirements, either 78B09ST or 206-9ST is required.

Q: How do mechanical life specifications compare?

A: The 78B09S and 78B09ST both specify 2,000 mechanical cycles. The 206-9ST does not provide a mechanical life specification. Electrical life differs: 78B09S and 78B09ST specify 2,000 cycles, while 206-9ST specifies 10,000 cycles.

Q: Is PCB layout modification required when substituting the 206-9ST?

A: Potential modification may be required. The 206-9ST height above board is 0.334" (8.48mm) compared to 0.315" (8.00mm) for the main part, representing a 0.019" increase. PCB layout must be verified to confirm adequate clearance above the component. Pitch spacing (0.100") and termination style (PC Pin) are identical, so footprint dimensions remain compatible.