Grayhill 90B08S DIP Switch Equivalent & Substitute Parts

Part Overview

The Grayhill 90B08S is an 8-position DIP switch with SPST (Single Pole Single Throw) circuit configuration, rated for 25mA at 24VDC. This component features a slide actuator with flush, recessed positioning and gold-plated copper alloy contacts. The 90B08S is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain functional compatibility across circuit topology, electrical ratings, mechanical form factor, and mounting characteristics.

Substiute Parts

90B08S

Grayhill Inc.In Stock: 117190B08S Datasheet

Current PartRFQ

90B08ST

Grayhill Inc.In Stock: 630690B08ST Datasheet

DirectRFQ

209-8LPST

CTS ElectrocomponentsIn Stock: 4705209-8LPST Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 90B08S is determined by strict adherence to the following critical parameters:

Primary Compatibility Criteria:

• Circuit topology: SPST configuration required
• Position count: 8 positions required
• Mounting method: Through hole required
• Pitch spacing: 0.100" (2.54mm) required
• Termination: PC pin required
• Actuator type: Slide (standard) required

Electrical Compatibility Criteria:

• Current rating must equal or exceed 25mA
• Voltage rating must equal or exceed 24VDC
• Operating temperature range must encompass -40°C to 85°C

Mechanical Compatibility Criteria:

• Actuator level: Flush, recessed positioning
• Contact finish: Gold plating
• Washable design capability

The 90B08S has two identified substitutes: the Grayhill 90B08ST and the CTS Electrocomponents 209-8LPST. Both parts satisfy the primary compatibility criteria. Electrical parameter variations exist and are documented in the parameter comparison table below.

Parameter Comparison

Engineering Selection Recommendations

90B08ST (Grayhill Inc.) - Primary Substitute

The 90B08ST is the direct functional equivalent to the 90B08S. Both parts share identical electrical ratings (25mA, 24VDC), mechanical dimensions, and circuit topology. The 90B08ST differs only in product status (active versus obsolete) and RoHS compliance (RoHS3 compliant versus non-compliant). The 90B08ST is available in tube packaging with 6,198 units in stock. This part is the preferred substitute for applications requiring direct replacement without design modification.

209-8LPST (CTS Electrocomponents) - Alternative Substitute

The 209-8LPST provides functional substitution with the following considerations:

• Current rating of 100mA exceeds the 90B08S requirement of 25mA, providing design margin for current-limited applications
• Voltage rating of 20VDC is lower than the 90B08S rating of 24VDC; this part is suitable only for applications operating at 20VDC or below
• Height above board is 0.180" (4.57mm) versus 0.195" (4.95mm) for the 90B08S, representing a 0.015" reduction in vertical clearance
• Contact material is beryllium copper versus copper alloy, providing different contact wear characteristics
• RoHS3 compliance is confirmed

The 209-8LPST is suitable for designs operating at 20VDC or lower with current requirements up to 100mA. This part is available in tube packaging with 4,609 units in stock.

Compliance Considerations

Both substitute parts are RoHS3 compliant, addressing regulatory requirements not met by the obsolete 90B08S. Both parts maintain REACH unaffected status and identical moisture sensitivity levels (MSL 1, unlimited).

Frequently Asked Questions (FAQ)

Q: Can the 90B08ST directly replace the 90B08S without circuit modification?

A: Yes. The 90B08ST is electrically and mechanically identical to the 90B08S. Both parts are rated for 25mA at 24VDC with 8 SPST positions, identical pitch spacing (0.100"), and identical through-hole PC pin termination. No circuit modification is required.

Q: What is the key limitation of the 209-8LPST as a substitute?

A: The 209-8LPST has a maximum voltage rating of 20VDC, compared to the 90B08S rating of 24VDC. This part is suitable only for applications operating at 20VDC or lower. Additionally, the current rating of 100mA exceeds the 90B08S requirement, which is acceptable for current-limited applications but represents a different electrical characteristic.

Q: Are there physical form factor differences between the substitutes?

A: Minor differences exist. The 209-8LPST has a height above board of 0.180" (4.57mm) versus 0.195" (4.95mm) for both the 90B08S and 90B08ST, a difference of 0.015". The 209-8LPST length is 0.858" (21.80mm) versus 0.870" (22.10mm) for the other parts. These differences are negligible for most PCB layouts but should be verified for space-constrained designs.

Q: What is the difference between the 90B08S and 90B08ST packaging?

A: The 90B08S is supplied in standard packaging (dash notation), while the 90B08ST is supplied in tube packaging. Both parts are identical in electrical and mechanical specifications. Tube packaging is standard for active production parts.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the 90B08ST and 209-8LPST are RoHS3 compliant. The original 90B08S is RoHS non-compliant. For applications requiring RoHS compliance, either substitute part is acceptable within the specified electrical and mechanical parameters.

Q: What contact material differences exist between the substitutes?

A: The 90B08S and 90B08ST use copper alloy contacts, while the 209-8LPST uses beryllium copper contacts. Both materials are gold-plated. Beryllium copper provides different contact wear and electrical characteristics. For applications with specific contact material requirements, the 90B08ST maintains material consistency with the original part.

Q: Can the 209-8LPST be used in a 24VDC circuit?

A: No. The 209-8LPST is rated for a maximum of 20VDC. Using this part in a 24VDC circuit exceeds its voltage rating and is not permitted. The 90B08ST is the appropriate substitute for 24VDC applications.