SD03H0BD DIP Switch Equivalent & Substitute Parts

Part Overview

The SD03H0BD is a 3-position DIP slide switch manufactured by C&K, designed for through-hole mounting applications requiring SPST (Single Pole Single Throw) switching functionality. This component operates at 100mA and 25VDC with a standard slide actuator configuration. The part is currently active in production and maintains full RoHS3 compliance. Alternative equivalent parts may be required due to inventory constraints, application-specific performance requirements, or design optimization needs.

Substiute Parts

SD03H0BD

C&KIn Stock: 1107SD03H0BD Datasheet

Current PartRFQ

78RB03T

Grayhill Inc.In Stock: 120578RB03T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The 78RB03T from Grayhill Inc. qualifies as a functional equivalent based on the following critical parameters:

• Circuit Configuration: Both parts are SPST switches with identical switching topology
• Number of Positions: Both provide 3-position switching capability
• Actuator Type: Both use standard slide actuators with flush/recessed actuation levels
• Mounting Type: Both are through-hole mounted components
• Pitch Spacing: Both maintain 0.100" (2.54mm) pitch for PCB compatibility
• Operating Temperature Range: Both operate across -40°C ~ 85°C
• Mechanical and Electrical Life: Both rated for 2,000 cycles
• Compliance: Both are ROHS3 compliant and REACH unaffected

The 78RB03T provides higher electrical performance specifications (150mA at 30VDC versus 100mA at 25VDC), making it suitable for applications where the SD03H0BD is specified but higher current or voltage margins are acceptable.

Parameter Comparison

Engineering Selection Recommendations

Both the SD03H0BD and 78RB03T are active production components with full ROHS3 compliance and REACH unaffected status, making them suitable for regulated applications. The 78RB03T provides higher electrical performance margins (150mA/30VDC versus 100mA/25VDC) while maintaining identical mechanical and functional characteristics. Selection between these parts should be based on application current and voltage requirements. The 78RB03T is appropriate for designs where the SD03H0BD is specified but higher performance headroom is beneficial or required.

Frequently Asked Questions (FAQ)

Q: Can the 78RB03T directly replace the SD03H0BD in existing designs?

A: Yes, the 78RB03T is mechanically and functionally compatible. Both parts share identical pitch spacing (0.100"), through-hole mounting configuration, 3-position SPST switching topology, and standard slide actuator design. PCB layout modifications are not required.

Q: What are the key differences between these parts?

A: The primary differences are electrical performance ratings and contact materials. The 78RB03T is rated for 150mA at 30VDC compared to the SD03H0BD's 100mA at 25VDC. The SD03H0BD uses beryllium copper contacts while the 78RB03T uses copper alloy contacts. Both maintain gold finish and identical mechanical life specifications.

Q: Are there height or footprint considerations?

A: The parts have different heights above board (SD03H0BD: 0.168" / 4.27mm; 78RB03T: 0.265" / 6.73mm) and lengths (SD03H0BD: 0.358" / 9.09mm; 78RB03T: 0.380" / 9.65mm). Verify clearance in applications with space constraints.

Q: Do both parts meet the same compliance requirements?

A: Yes, both the SD03H0BD and 78RB03T are ROHS3 compliant, REACH unaffected, and carry identical MSL ratings (1 - Unlimited). Both are suitable for regulated and commercial applications.

Q: Which part should be selected for new designs?

A: Selection depends on application current and voltage requirements. If the application requires 100mA at 25VDC or less, either part is acceptable. If higher performance margins are desired or if the application approaches 100mA operation, the 78RB03T's higher ratings (150mA/30VDC) provide additional design margin.