Grayhill 78RB02 DIP Switch SPST Equivalent & Substitute Parts

Part Overview

The Grayhill 78RB02 is a slide-actuated DIP switch with SPST (Single Pole Single Throw) configuration, rated for 150mA at 30VDC. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and procurement continuity. The 78RB02 features a through-hole mounting design with gold-plated copper alloy contacts and operates across the industrial temperature range of -40°C to 85°C.

Substiute Parts

78RB02

Grayhill Inc.In Stock: 83678RB02 Datasheet

Current PartRFQ

78RB02T

Grayhill Inc.In Stock: 134478RB02T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Grayhill 78RB02 is determined by strict equivalence across all electrical and mechanical parameters. The primary substitute identified is the 78RB02T, which maintains identical specifications across the following critical parameters:

Electrical Parameters (Must Match):

• Circuit configuration: SPST
• Number of positions: 2
• Current rating: 150mA
• Voltage rating: 30VDC

Mechanical Parameters (Must Match):

• Actuator type: Slide (Standard)
• Actuator level: Flush, Recessed
• Contact material: Copper Alloy
• Contact finish: Gold
• Mounting type: Through Hole
• Termination style: PC Pin
• Pitch: 0.100" (2.54mm)
• Height above board: 0.265" (6.73mm)
• Length: 0.280" (7.11mm)

Environmental Parameters (Must Match):

• Operating temperature range: -40°C to 85°C
• Mechanical life: 2,000 Cycles
• Electrical life: 2,000 Cycles
• Moisture sensitivity level: MSL 1

The 78RB02T is the direct successor to the obsolete 78RB02, with identical form, fit, and function characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 78RB02T is the direct functional equivalent of the obsolete 78RB02. Selection of the 78RB02T is based on the following engineering criteria:

Product Status: The 78RB02 is classified as obsolete. The 78RB02T maintains active product status with Grayhill Inc., ensuring ongoing availability and manufacturer support.

Regulatory Compliance: The 78RB02T achieves ROHS3 compliance, whereas the original 78RB02 is RoHS non-compliant. This distinction is significant for applications subject to RoHS directives and environmental regulations.

Electrical and Mechanical Equivalence: All electrical parameters (circuit configuration, current rating, voltage rating) and mechanical parameters (actuator type, mounting dimensions, contact materials) are identical between the two parts. Direct substitution is supported without circuit redesign or PCB layout modification.

Environmental Specifications: Both parts operate across the identical temperature range (-40°C to 85°C) and maintain equivalent mechanical and electrical life ratings (2,000 cycles each).

Packaging Consideration: The 78RB02T is supplied in tube packaging, whereas the 78RB02 was supplied in bulk. This represents a packaging difference only and does not affect functional performance.

Frequently Asked Questions (FAQ)

Q: Can the 78RB02T be used as a direct replacement for the 78RB02 on existing PCBs?

A: Yes. The 78RB02T is a direct functional equivalent with identical electrical and mechanical specifications. No PCB layout modifications, circuit redesign, or component repositioning is required. The through-hole mounting footprint, pin pitch (0.100"), and all dimensional parameters are identical.

Q: What is the difference between the 78RB02 and 78RB02T?

A: The primary differences are product status and regulatory compliance. The 78RB02 is obsolete and RoHS non-compliant. The 78RB02T is an active product that achieves ROHS3 compliance. All electrical and mechanical specifications are identical. Packaging differs (bulk versus tube), but this does not affect functional performance.

Q: Are there any electrical performance differences between these parts?

A: No. Both parts are rated for 150mA at 30VDC with SPST configuration and 2-position operation. Contact material (copper alloy with gold finish), operating temperature range (-40°C to 85°C), and life ratings (2,000 mechanical and electrical cycles) are identical.

Q: Why should I transition from the 78RB02 to the 78RB02T?

A: The 78RB02 is obsolete and subject to discontinuation. The 78RB02T ensures long-term component availability, manufacturer support, and regulatory compliance (ROHS3). Functional performance remains unchanged.

Q: Does the tube packaging of the 78RB02T affect compatibility?

A: No. Packaging format (tube versus bulk) does not affect electrical or mechanical performance. The component itself is identical. Packaging differences relate only to order quantity, handling, and storage considerations.

Q: What are the critical parameters for substitution of DIP switches in this category?

A: Critical substitution parameters include circuit configuration (SPST), number of positions (2), current rating (150mA), voltage rating (30VDC), actuator type (slide standard), mounting type (through hole), pitch (0.100"), and all dimensional specifications. Any deviation in these parameters indicates incompatibility.