Grayhill 78RB03S DIP Switch Equivalent & Substitute Parts

Part Overview

The Grayhill 78RB03S is a single-pole single-throw (SPST) slide DIP switch designed for through-hole mounting applications. This component features a 3-position configuration with a rated current capacity of 150mA at 30VDC, making it suitable for low-voltage digital logic and control circuit applications. The switch employs a standard slide actuator with flush, recessed positioning and gold-plated copper alloy contacts for reliable electrical performance.

The 78RB03S carries an obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability for production, and support long-term system maintenance and repair requirements.

Substiute Parts

78RB03S

Grayhill Inc.In Stock: 73878RB03S Datasheet

Current PartRFQ

78RB03ST

Grayhill Inc.In Stock: 932278RB03ST Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Grayhill 78RB03S is determined by strict equivalence across the following critical parameters:

Electrical Parameters: Circuit configuration (SPST), number of positions (3), current rating (150mA), and voltage rating (30VDC) must be identical. These parameters define the functional electrical behavior and load-handling capability of the switch.

Mechanical Parameters: Actuator type (slide standard), actuator level (flush, recessed), mounting type (through hole), pitch (0.100" / 2.54mm), and height above board (0.265" / 6.73mm) must match to ensure physical compatibility with existing printed circuit board layouts and mechanical assemblies.

Material and Contact Specifications: Contact material (copper alloy) and contact finish (gold) ensure equivalent electrical performance and reliability characteristics.

Environmental Specifications: Operating temperature range (-40°C to 85°C), mechanical life (2,000 cycles), and electrical life (2,000 cycles) must be maintained to preserve system performance under specified operating conditions.

The substitute part 78RB03ST meets all these criteria and is therefore a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

The Grayhill 78RB03ST is the direct functional equivalent for the obsolete 78RB03S. Both components share identical electrical and mechanical specifications, ensuring drop-in compatibility in existing circuit designs and PCB layouts.

Product Status Consideration: The 78RB03S is classified as obsolete, while the 78RB03ST maintains active product status with Grayhill Inc. This status difference ensures long-term component availability and continued manufacturing support for the 78RB03ST.

Compliance Advantage: The 78RB03ST achieves RoHS3 compliance, whereas the 78RB03S is RoHS non-compliant. For applications subject to RoHS regulatory requirements or customer specifications mandating RoHS compliance, the 78RB03ST provides the necessary certification alignment.

Packaging Consideration: The 78RB03ST is supplied in tube packaging, which may differ from the original packaging format of the 78RB03S. Verify that tube packaging is compatible with existing procurement, storage, and assembly processes.

Inventory and Lead Time: The 78RB03ST demonstrates significantly higher inventory availability (9,310 pieces in stock) compared to the 78RB03S (638 pieces), supporting reliable supply chain continuity for production and maintenance requirements.

Frequently Asked Questions (FAQ)

Q: Can the 78RB03ST be used as a direct replacement for the 78RB03S in existing designs?

A: Yes. The 78RB03ST is electrically and mechanically equivalent to the 78RB03S. All critical parameters including circuit configuration, current and voltage ratings, actuator type, mounting dimensions, and operating temperature range are identical. The component can be substituted without design modifications.

Q: What is the difference between the 78RB03S and 78RB03ST?

A: The primary differences are product status and regulatory compliance. The 78RB03S is obsolete and RoHS non-compliant, while the 78RB03ST is an active product with RoHS3 compliance. Packaging format also differs: the 78RB03ST is supplied in tube packaging. Electrical and mechanical specifications are identical.

Q: Does the RoHS3 compliance of the 78RB03ST affect its electrical performance?

A: No. RoHS3 compliance is a regulatory and material composition specification that does not alter the electrical performance, current rating, voltage rating, or switching characteristics of the component. The 78RB03ST maintains identical electrical specifications to the 78RB03S.

Q: Is the tube packaging of the 78RB03ST compatible with standard assembly processes?

A: Tube packaging is a standard format for through-hole components and is compatible with conventional pick-and-place assembly equipment and manual assembly processes. Verify compatibility with your specific assembly workflow and equipment specifications.

Q: Are there any mechanical compatibility concerns when substituting the 78RB03ST for the 78RB03S?

A: No mechanical compatibility concerns exist. Both components share identical mounting type (through hole), pitch (0.100" / 2.54mm), height above board (0.265" / 6.73mm), and termination style (PC pin). PCB layouts and mechanical assemblies designed for the 78RB03S require no modification to accommodate the 78RB03ST.

Q: What is the mechanical life specification for the 78RB03ST?

A: The 78RB03ST has a mechanical life rating of 2,000 cycles, identical to the 78RB03S. This specification defines the expected number of actuator position changes under normal operating conditions.

Q: Can the 78RB03ST operate across the same temperature range as the 78RB03S?

A: Yes. Both components are rated for operation across the identical temperature range of -40°C to 85°C. No thermal performance differences exist between the two parts.