Equivalent & Substitute Parts for Grayhill 90GB04ST DIP Switch

Part Overview

The Grayhill 90GB04ST is a slide-actuated DIP switch featuring SPST (Single Pole Single Throw) configuration with 4 positions, rated for 10mA at 30VDC. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement continuity. The 90GB04ST remains available in inventory (685 pcs) but alternative solutions are required for new designs and long-term supply assurance.

Substiute Parts

90GB04ST

Grayhill Inc.In Stock: 79290GB04ST Datasheet

Current PartRFQ

90B04ST

Grayhill Inc.In Stock: 391390B04ST Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 90GB04ST is determined by strict adherence to the following parameters:

Mandatory Matching Parameters:

• Circuit Configuration: SPST (single pole, single throw operation required)
• Number of Positions: 4 (array size and footprint compatibility)
• Actuator Type: Slide (Standard) (mechanical interface requirement)
• Mounting Type: Through Hole (assembly process compatibility)
• Pitch: 0.100" (2.54mm) (PCB layout compatibility)
• Height Above Board: 0.195" (4.95mm) (clearance and enclosure fit)
• Contact Material: Copper Alloy with Gold Finish (electrical performance)

Allowable Parameter Variations:

• Current Rating: Substitute must equal or exceed 10mA
• Voltage Rating: Substitute must equal or exceed 30VDC
• Product Status: Active status preferred for long-term availability
• Packaging: May differ from original (Tube vs. other formats acceptable)

The Grayhill 90B04ST meets all mandatory matching criteria while providing enhanced electrical ratings (25mA at 24VDC), ensuring functional compatibility with superior performance margins.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: Grayhill 90B04ST

The 90B04ST is the direct functional equivalent for the obsolete 90GB04ST. Selection rationale is based on the following engineering factors:

Compliance & Certification Alignment:

• Both parts maintain ROHS3 compliance, ensuring regulatory consistency across product generations
• Identical MSL rating (1 - Unlimited) eliminates moisture sensitivity concerns during storage and assembly
• REACH Unaffected status confirms no supply chain regulatory complications

Electrical Performance:

• The 90B04ST current rating of 25mA exceeds the 90GB04ST requirement of 10mA, providing operational margin
• Voltage rating differential (24VDC vs. 30VDC) is acceptable in applications where the 90GB04ST operates below 24VDC
• For applications requiring the full 30VDC rating, the 90GB04ST must be retained or alternative suppliers consulted

Mechanical & Physical Compatibility:

• Identical pitch (0.100" / 2.54mm), height (0.195" / 4.95mm), and mounting configuration ensure direct PCB footprint compatibility
• No layout modifications or assembly process changes required
• Identical mechanical and electrical life ratings (2,000 cycles) maintain reliability expectations

Availability & Supply Chain:

• 90B04ST is classified as Active with 3,885 pcs in inventory, ensuring long-term procurement stability
• 90GB04ST remains available (685 pcs) for legacy system support during transition periods

Application-Specific Considerations:

• For new designs: Specify 90B04ST exclusively
• For existing 90GB04ST designs operating below 24VDC: Direct substitution is permissible
• For existing designs requiring 30VDC operation: Retain 90GB04ST or conduct full electrical re-evaluation

Frequently Asked Questions (FAQ)

Q: Can the 90B04ST directly replace the 90GB04ST in existing PCB assemblies?

A: Yes, for applications where the circuit operates at or below 24VDC. The 90B04ST maintains identical mechanical dimensions (pitch, height, mounting type) and SPST 4-position configuration. The higher current rating (25mA vs. 10mA) provides additional operational margin. However, if the original design requires the full 30VDC rating of the 90GB04ST, substitution is not permissible without circuit re-evaluation.

Q: What are the key differences between these two parts?

A: The primary differences are product status and electrical ratings. The 90GB04ST is obsolete with 10mA/30VDC ratings, while the 90B04ST is active with 25mA/24VDC ratings. All mechanical parameters, contact materials, and certifications are identical. The 90B04ST offers superior current capacity but lower maximum voltage.

Q: Are there any packaging differences?

A: Yes. The 90GB04ST is supplied in standard packaging (not specified), while the 90B04ST is supplied in Tube packaging. This difference does not affect electrical or mechanical compatibility; it only impacts receiving, storage, and handling procedures.

Q: Do both parts have the same PCB footprint?

A: Yes. Both parts feature 0.100" (2.54mm) pitch, 0.195" (4.95mm) height above board, through-hole mounting with PC pins, and identical physical dimensions. No PCB layout modifications are required for substitution.

Q: Are there any compliance or regulatory concerns with substitution?

A: No. Both parts are ROHS3 compliant, REACH Unaffected, and carry identical MSL ratings (1 - Unlimited). Substitution does not introduce regulatory complications.

Q: What is the mechanical life expectancy for both parts?

A: Both the 90GB04ST and 90B04ST are rated for 2,000 mechanical cycles and 2,000 electrical cycles. Reliability and durability expectations remain unchanged with substitution.

Q: Should I use the 90B04ST for new designs?

A: Yes. The 90B04ST is the recommended choice for all new designs. It provides active product status, superior current rating, and ensures long-term supply availability. The 90GB04ST should be reserved for legacy system support only.