SD04H1BD DIP Switch SPST 4-Position Equivalent & Substitute Parts

Part Overview

The SD04H1BD is a DIP switch manufactured by C&K, featuring a 4-position SPST configuration with slide actuator, rated for 100mA at 25VDC. This component is actively produced and widely used in electronic assemblies requiring manual configuration switching through through-hole mounting. Substitute parts may be required due to inventory constraints, design revisions, or application-specific performance requirements that exceed the original specification.

Key Parameters

Parameter	Value
Circuit Configuration	SPST (Single Pole Single Throw)
Number of Positions	4
Current Rating	100mA
Voltage Rating	25VDC
Actuator Type	Slide (Standard)
Mounting Type	Through Hole
Pitch	0.100" (2.54mm)
Contact Material	Beryllium Copper
Contact Finish	Gold
Operating Temperature Range	-40°C to 85°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the SD04H1BD is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Circuit configuration must remain SPST
Number of positions must be 4
Mounting type must be through hole
Pitch must be 0.100" (2.54mm)
Operating temperature range must encompass -40°C to 85°C

Allowable Variation Parameters:

Current rating may exceed 100mA (higher ratings are backward compatible)
Voltage rating may exceed 25VDC (higher ratings are backward compatible)
Actuator type may differ (slide vs. rocker) provided mechanical envelope permits board-level integration
Contact material and finish may vary while maintaining gold plating for corrosion resistance
Height above board and overall length may vary within PCB layout constraints

The substitute parts listed below meet all mandatory compatibility parameters and provide equal or superior electrical performance.

Parameter Comparison

Parameter	SD04H1BD (C&K)	78B04T (Grayhill)	76SB04T (Grayhill)
Manufacturer	C&K	Grayhill Inc.	Grayhill Inc.
Circuit Configuration	SPST	SPST	SPST
Number of Positions	4	4	4
Current Rating	100mA	150mA	150mA
Voltage Rating	25VDC	30VDC	30VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Rocker
Mounting Type	Through Hole	Through Hole	Through Hole
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Contact Finish	Gold	Gold	Gold
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Mechanical Life	2,000 Cycles	2,000 Cycles	2,000 Cycles
Electrical Life	2,000 Cycles	2,000 Cycles	2,000 Cycles
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

Both substitute parts exceed the electrical specifications of the SD04H1BD while maintaining identical circuit topology and mounting compatibility.

78B04T (Grayhill): Direct functional equivalent with identical slide actuator type. Provides 50% higher current rating (150mA vs. 100mA) and 20% higher voltage rating (30VDC vs. 25VDC). Height above board increases from 0.178" to 0.315", requiring verification of available PCB clearance. ROHS3 compliant and active product status.

76SB04T (Grayhill): Functionally equivalent with rocker actuator instead of slide actuator. Provides identical current and voltage rating improvements as 78B04T. Rocker actuator may require different user interface considerations compared to slide operation. Height above board increases to 0.315", requiring PCB clearance verification. ROHS3 compliant and active product status.

All three parts maintain identical operating temperature range, mechanical life, electrical life, and compliance certifications. Selection between substitutes depends on actuator preference (slide vs. rocker) and available PCB vertical clearance.

Frequently Asked Questions (FAQ)

Q: Can 78B04T or 76SB04T be used as direct replacements for SD04H1BD?

A: Both parts are functionally compatible. The 78B04T maintains the slide actuator type, while 76SB04T uses a rocker actuator. Both exceed the electrical ratings of the original part. PCB layout must accommodate the increased height above board (0.315" vs. 0.178").

Q: What is the primary difference between 78B04T and 76SB04T?

A: The actuator mechanism differs. 78B04T uses a slide actuator identical to the SD04H1BD, while 76SB04T uses a rocker actuator. Electrical specifications and mounting pitch are identical between the two Grayhill parts.

Q: Are there any compliance or certification differences between these parts?

A: All three parts are ROHS3 compliant, REACH unaffected, and carry identical MSL ratings (1 - Unlimited). No compliance differences exist.

Q: What mechanical parameters must be verified before substitution?

A: Height above board and overall length must be confirmed against PCB layout. The SD04H1BD measures 0.178" in height, while both Grayhill substitutes measure 0.315". Verify available vertical clearance before selection.

Q: Can these parts be used interchangeably in the same circuit?

A: Yes, provided the circuit operates within 25VDC and 100mA or lower. The substitute parts are rated for higher values and will operate safely at the original part's specifications. Actuator type selection (slide vs. rocker) depends on user interface requirements.

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