Grayhill Inc. 90MB03S DIP Switch SPST Equivalent & Substitute Parts

Part Overview

The Grayhill Inc. 90MB03S is a slide-actuated DIP switch featuring SPST (Single Pole Single Throw) configuration with 3 positions, rated for 25mA at 24VDC. This component is classified as obsolete, which necessitates identification of functionally equivalent active alternatives for new designs and ongoing production requirements. The 90MB03S employs through-hole mounting with PC pin termination and gold-plated copper alloy contacts suitable for washable applications.

Substiute Parts

90MB03S

Grayhill Inc.In Stock: 96690MB03S Datasheet

Current PartRFQ

90B03ST

Grayhill Inc.In Stock: 561690B03ST Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 90MB03S is determined by strict equivalence across electrical and mechanical parameters. The primary substitute, Grayhill Inc. 90B03ST, maintains identical functional specifications including SPST circuit topology, 3-position configuration, 25mA current rating, and 24VDC voltage rating. Both components share identical physical dimensions, actuator characteristics (slide standard with flush/recessed level), through-hole mounting with PC pin termination, and 0.100" pitch spacing.

The substitution relationship is valid based on the following critical parameters:

• Circuit configuration (SPST)
• Number of positions (3)
• Current and voltage ratings (25mA / 24VDC)
• Actuator type and level (Slide Standard / Flush, Recessed)
• Mounting and termination (Through Hole / PC Pin)
• Physical dimensions and pitch (0.370" length, 0.195" height, 0.100" pitch)
• Contact material and finish (Copper Alloy / Gold)
• Operating temperature range (-40°C to 85°C)
• Mechanical and electrical life (2,000 Cycles)

Parameter Comparison

Engineering Selection Recommendations

The Grayhill Inc. 90B03ST serves as the direct functional equivalent for the obsolete 90MB03S. Selection of the 90B03ST is appropriate for applications requiring SPST DIP switch functionality with 3-position slide actuation at 25mA / 24VDC ratings.

The 90B03ST offers two significant advantages over the 90MB03S:

Product Status: The 90B03ST maintains active product status, ensuring continued availability and manufacturer support. The 90MB03S is classified as obsolete, limiting future procurement options.

Regulatory Compliance: The 90B03ST achieves ROHS3 compliance, whereas the 90MB03S is RoHS non-compliant. For applications subject to RoHS directives, the 90B03ST is the required selection.

Moisture Sensitivity: The 90B03ST carries MSL 1 (Unlimited), compared to the 90MB03S MSL 3 (168 Hours). This improvement reduces handling and storage constraints in manufacturing environments.

All electrical and mechanical parameters remain identical between the two components, ensuring direct functional interchangeability in circuit designs and PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the 90B03ST directly replace the 90MB03S in existing designs?

A: Yes. The 90B03ST maintains identical electrical specifications (SPST, 3-position, 25mA, 24VDC), actuator characteristics (slide standard, flush/recessed), physical dimensions (0.370" length, 0.195" height, 0.100" pitch), and contact properties (copper alloy, gold finish). No circuit modifications or PCB layout changes are required.

Q: What is the primary reason to transition from 90MB03S to 90B03ST?

A: The 90MB03S is obsolete, limiting future procurement. The 90B03ST is an active product with confirmed ongoing availability. Additionally, the 90B03ST achieves ROHS3 compliance and carries improved moisture sensitivity level (MSL 1 versus MSL 3).

Q: Are there packaging differences between these components?

A: The 90MB03S packaging is not specified in available documentation. The 90B03ST is supplied in tube packaging. Confirm packaging requirements with your procurement or assembly team to ensure compatibility with your manufacturing processes.

Q: Do both components share the same pitch and mounting footprint?

A: Yes. Both the 90MB03S and 90B03ST feature 0.100" (2.54mm) pitch spacing and through-hole PC pin termination. PCB footprints are identical.

Q: What is the operating temperature range for both components?

A: Both components operate across -40°C to 85°C. This range is identical for the 90MB03S and 90B03ST.

Q: Are there any electrical performance differences between the two parts?

A: No. Both components are rated for 25mA at 24VDC with identical mechanical life (2,000 cycles) and electrical life (2,000 cycles). Contact material (copper alloy) and finish (gold) are identical.

Q: Which component should be specified for new designs?

A: The 90B03ST should be specified for all new designs. It is an active product with superior regulatory compliance (ROHS3) and improved moisture sensitivity characteristics (MSL 1).