Grayhill 90B03S DIP Switch SPST Equivalent & Substitute Parts

Part Overview

The Grayhill 90B03S is a slide-actuated DIP switch with SPST (Single Pole Single Throw) configuration, rated for 25mA at 24VDC. This component is classified as obsolete, making identification of suitable substitutes essential for ongoing production support and design updates. The 90B03S features a 3-position through-hole design with gold-plated copper alloy contacts, flush-recessed actuator, and PC pin termination at 0.100" pitch spacing.

Obsolescence of the 90B03S necessitates evaluation of alternative components that maintain functional compatibility within the electrical and mechanical constraints of the original application.

Key Parameters

Parameter	Value
Circuit Configuration	SPST
Number of Positions	3
Current Rating	25mA
Voltage Rating	24VDC
Actuator Type	Slide (Standard)
Actuator Level	Flush, Recessed
Mounting Type	Through Hole
Pitch	0.100" (2.54mm)
Termination Style	PC Pin
Operating Temperature Range	-40°C to 85°C
Contact Material	Copper Alloy
Contact Finish	Gold

Substitute Part Grouping Explanation

Substitution eligibility for the 90B03S is determined by strict alignment with the following critical parameters:

Primary Compatibility Criteria:

Circuit configuration: SPST
Number of positions: 3
Mounting type: Through Hole
Pitch spacing: 0.100" (2.54mm)
Termination style: PC Pin
Actuator type: Slide (Standard)
Operating temperature range: -40°C to 85°C

Secondary Compatibility Criteria:

Current rating: Must equal or exceed 25mA
Voltage rating: Must equal or exceed 24VDC
Actuator level: Flush, Recessed
Contact finish: Gold

Two substitute parts meet the core mechanical and electrical requirements of the 90B03S:

Group 1 - Direct Manufacturer Equivalent: Grayhill 90B03ST provides identical electrical and mechanical specifications with active product status and improved RoHS3 compliance.

Group 2 - Cross-Manufacturer Alternative: CTS Electrocomponents 209-3LPST offers compatible mechanical form factor with elevated electrical ratings (100mA at 20VDC), suitable for applications where the original 25mA at 24VDC specification provides design margin.

Parameter Comparison

Parameter	90B03S (Main Part)	90B03ST (Substitute)	209-3LPST (Substitute)
Manufacturer	Grayhill Inc.	Grayhill Inc.	CTS Electrocomponents
Product Status	Obsolete	Active	Active
Circuit Configuration	SPST	SPST	SPST
Number of Positions	3	3	3
Current Rating	25mA	25mA	100mA
Voltage Rating	24VDC	24VDC	20VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Slide (Standard)
Actuator Level	Flush, Recessed	Flush, Recessed	Flush, Recessed
Mounting Type	Through Hole	Through Hole	Through Hole
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Termination Style	PC Pin	PC Pin	PC Pin
Height Above Board	0.195" (4.95mm)	0.195" (4.95mm)	0.180" (4.57mm)
Length	0.370" (9.40mm)	0.370" (9.40mm)	0.358" (9.09mm)
Contact Material	Copper Alloy	Copper Alloy	Beryllium Copper
Contact Finish	Gold	Gold	Gold
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Electrical Life	2,000 Cycles	2,000 Cycles	2,000 Cycles
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Bulk	Tube	Tube

Engineering Selection Recommendations

Primary Recommendation: Grayhill 90B03ST

The 90B03ST is the preferred substitute for the obsolete 90B03S. This component maintains identical electrical specifications (25mA at 24VDC) and mechanical form factor, ensuring direct functional equivalence. The 90B03ST carries active product status with ROHS3 compliance certification, providing long-term supply chain stability and regulatory alignment. Packaging transition from bulk to tube format represents a standard industry practice with no functional impact.

Secondary Recommendation: CTS Electrocomponents 209-3LPST

The 209-3LPST serves as a cross-manufacturer alternative when design requirements permit elevated electrical ratings. This component provides 100mA current capacity at 20VDC, exceeding the original 25mA at 24VDC specification. The 209-3LPST maintains mechanical compatibility through identical pitch spacing, through-hole mounting, and flush-recessed slide actuator configuration. Dimensional variations (height 0.180" versus 0.195", length 0.358" versus 0.370") remain within typical PCB layout tolerances for DIP switch applications. ROHS3 compliance and active product status support production continuity.

Selection between these substitutes depends on application voltage and current requirements. Applications operating at or below 20VDC with current demands not exceeding 100mA may utilize the 209-3LPST. Applications requiring 24VDC operation or strict electrical specification matching must use the 90B03ST.

Frequently Asked Questions (FAQ)

Q: Can the 90B03ST directly replace the 90B03S without PCB modification?

A: Yes. The 90B03ST maintains identical electrical ratings (25mA at 24VDC), mechanical dimensions, pitch spacing (0.100"), and through-hole PC pin termination. No PCB layout changes are required. Packaging format change from bulk to tube does not affect component functionality.

Q: What are the key differences between the 90B03ST and 209-3LPST?

A: The primary differences are manufacturer (Grayhill versus CTS), current rating (25mA versus 100mA), voltage rating (24VDC versus 20VDC), contact material (copper alloy versus beryllium copper), and minor dimensional variations (height and length). Both maintain SPST 3-position configuration, 0.100" pitch, through-hole mounting, and gold-plated contacts. The 209-3LPST provides higher current capacity; the 90B03ST maintains exact voltage specification.

Q: Is the 209-3LPST suitable for 24VDC applications?

A: The 209-3LPST is rated for 20VDC maximum. Applications requiring 24VDC operation must use the 90B03ST. Operating the 209-3LPST above its 20VDC rating violates component specifications and may result in contact degradation or failure.

Q: What is the impact of the height difference between 90B03S/90B03ST (0.195") and 209-3LPST (0.180")?

A: The 0.015" (0.38mm) height reduction of the 209-3LPST is within standard PCB design tolerances for DIP switch applications. This dimension typically does not affect component placement or clearance in standard through-hole designs. Verify specific PCB clearance requirements for your application.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the Grayhill 90B03ST and CTS Electrocomponents 209-3LPST carry ROHS3 compliance certification. The original 90B03S is RoHS non-compliant. Substitution to either alternative part satisfies RoHS regulatory requirements for new designs and production updates.

Q: What is the difference in packaging between the 90B03S and substitute parts?

A: The 90B03S is supplied in bulk packaging. Both substitute parts (90B03ST and 209-3LPST) are supplied in tube packaging. Tube packaging is standard for active production components and provides improved component protection and handling efficiency. No functional difference exists between bulk and tube packaging formats.

Q: Can the 90B03ST and 209-3LPST be used interchangeably in the same application?

A: Interchangeability depends on application electrical requirements. If the application operates at 24VDC or requires strict adherence to the original 25mA specification, only the 90B03ST is suitable. If the application operates at 20VDC or lower with current demands not exceeding 100mA, the 209-3LPST is compatible. Verify application voltage and current requirements before selecting either substitute.

Q: What is the mechanical life specification for the substitute parts?

A: The 90B03ST specifies 2,000 mechanical cycles, matching the original 90B03S. The 209-3LPST does not provide a published mechanical life specification in the available data. For applications requiring documented mechanical life ratings, the 90B03ST is the recommended choice.

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