Grayhill 78RB03 DIP Switch Equivalent & Substitute Parts

Part Overview

The Grayhill 78RB03 is a slide-actuated DIP switch featuring SPST (Single Pole Single Throw) configuration with 3 positions, rated for 150mA at 30VDC. This component is classified as obsolete, making identification of compatible alternatives essential for ongoing system support and new design implementations. The 78RB03T represents the active production equivalent, offering identical electrical and mechanical specifications with improved compliance status.

Substiute Parts

78RB03

Grayhill Inc.In Stock: 75278RB03 Datasheet

Current PartRFQ

78RB03T

Grayhill Inc.In Stock: 120578RB03T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 78RB03 is determined by strict equivalence across the following critical parameters:

• Circuit topology: SPST configuration
• Position count: 3-position switch
• Electrical ratings: 150mA current capacity and 30VDC voltage rating
• Physical form factor: Slide actuator with flush/recessed actuation level
• Mounting interface: Through-hole termination with 0.100" (2.54mm) pitch
• Dimensional compatibility: Height above board of 0.265" (6.73mm) and length of 0.380" (9.65mm)
• Environmental specifications: Operating temperature range of -40°C to 85°C
• Durability: Mechanical and electrical life ratings of 2,000 cycles

The 78RB03T qualifies as a direct substitute because it maintains identical values across all these parameters while offering active product status and improved regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

For obsolescence mitigation: The 78RB03T is the direct replacement for the obsolete 78RB03. Both parts maintain identical electrical performance and physical compatibility, ensuring seamless integration into existing PCB designs without layout modifications.

For new designs: The 78RB03T is the appropriate selection due to its active product status and ROHS3 compliance. This ensures long-term availability and alignment with current regulatory requirements.

For compliance-sensitive applications: The 78RB03T provides ROHS3 compliance, whereas the 78RB03 is RoHS non-compliant. Applications subject to RoHS directives require the 78RB03T variant.

Packaging consideration: The 78RB03T is supplied in tube packaging, whereas the 78RB03 was supplied in bulk. This difference affects handling and inventory management but does not impact electrical or mechanical performance.

Frequently Asked Questions (FAQ)

Q: Can the 78RB03T be used as a direct replacement for the 78RB03 in existing assemblies?

A: Yes. The 78RB03T is electrically and mechanically identical to the 78RB03. All electrical ratings (150mA, 30VDC, SPST), physical dimensions (0.265" height, 0.100" pitch), and performance characteristics (2,000 cycle life) are equivalent. PCB layout and schematic modifications are not required.

Q: What is the primary difference between the 78RB03 and 78RB03T?

A: The 78RB03T is the active production variant with ROHS3 compliance, while the 78RB03 is obsolete and RoHS non-compliant. The 78RB03T also uses tube packaging instead of bulk packaging. Electrical and mechanical specifications are identical.

Q: Are there any dimensional differences between these parts?

A: No. Both parts share identical dimensions: 0.380" length, 0.265" height above board, and 0.100" pitch. They are fully compatible with the same PCB footprints.

Q: Does the packaging difference (bulk vs. tube) affect component performance?

A: No. Packaging affects only handling, storage, and inventory management. Electrical and mechanical performance is unaffected by packaging format.

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

A: Both the 78RB03 and 78RB03T operate across -40°C to 85°C, providing identical thermal performance for industrial and commercial applications.

Q: Are both parts suitable for high-reliability applications?

A: Both parts provide 2,000 mechanical and electrical cycles with MSL 1 (unlimited moisture sensitivity level). The 78RB03T offers the additional advantage of ROHS3 compliance for regulated environments.