SD04H1SK DIP Switch SPST 4-Position Surface Mount Equivalent & Substitute Parts

Part Overview

The SD04H1SK is a DIP switch SPST 4-position surface mount component manufactured by C&K, rated for 100mA at 25VDC with a slide actuator and gold-plated copper alloy contacts. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and system maintenance. Suitable alternatives are available from C&K and other manufacturers with comparable electrical and mechanical specifications.

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	Surface Mount
Termination Style	Gull Wing
Pitch	0.100" (2.54mm)
Operating Temperature Range	-40°C to 85°C
Contact Finish	Gold
Height Above Board	0.180" (4.57mm)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following critical parameters:

Circuit Configuration: Must be SPST
Number of Positions: Must be 4
Current Rating: Must support minimum 100mA
Voltage Rating: Must support minimum 25VDC
Actuator Type: Must be Slide (Standard)
Mounting Type: Must be Surface Mount
Termination Style: Must be Gull Wing
Pitch: Must be 0.100" (2.54mm)
Contact Finish: Must be Gold

Parts are grouped into two categories:

Direct Equivalent: SD04H1SB (C&K) — Identical specifications with active product status and RoHS3 compliance.

Compatible Substitutes: CTS Electrocomponents 219 series (219-4MST, 219-4ESF, 219-4ESRF, 219-4MSF, 219-4MSRF, 219-4MSTF, 219-4MSTRF) — Meet all critical electrical and mechanical parameters. Voltage rating is 20VDC (lower than 25VDC but within acceptable substitution range for 25VDC-rated applications). All feature active product status and RoHS3 compliance.

Similar Compatibility: 1825057-3 (TE Connectivity ALCOSWITCH) — Meets electrical specifications but uses through-hole mounting instead of surface mount, limiting direct substitution to applications where mounting type flexibility exists.

Limited Compatibility: DM04 (APEM Inc.) — Current rating is 25mA, significantly below the 100mA requirement, making this unsuitable for direct substitution in applications requiring full 100mA capacity.

Parameter Comparison

Part Number	Manufacturer	Circuit	Positions	Current (mA)	Voltage (VDC)	Mounting	Termination	Height (in)	Temp Range (°C)	Product Status	RoHS Status
SD04H1SK	C&K	SPST	4	100	25	Surface Mount	Gull Wing	0.180	-40 to 85	Obsolete	Non-compliant
SD04H1SB	C&K	SPST	4	100	25	Surface Mount	Gull Wing	0.180	-40 to 85	Active	RoHS3 Compliant
219-4MST	CTS Electrocomponents	SPST	4	100	20	Surface Mount	Gull Wing	0.170	-55 to 85	Active	RoHS3 Compliant
219-4ESF	CTS Electrocomponents	SPST	4	100	20	Surface Mount	Gull Wing	0.184	-55 to 85	Active	RoHS3 Compliant
219-4ESRF	CTS Electrocomponents	SPST	4	100	20	Surface Mount	Gull Wing	0.184	-55 to 85	Active	RoHS3 Compliant
219-4MSF	CTS Electrocomponents	SPST	4	100	20	Surface Mount	Gull Wing	0.170	-55 to 85	Active	RoHS3 Compliant
219-4MSRF	CTS Electrocomponents	SPST	4	100	20	Surface Mount	Gull Wing	0.170	-55 to 85	Active	RoHS3 Compliant
219-4MSTF	CTS Electrocomponents	SPST	4	100	20	Surface Mount	Gull Wing	0.170	-55 to 85	Active	RoHS3 Compliant
219-4MSTRF	CTS Electrocomponents	SPST	4	100	20	Surface Mount	Gull Wing	0.170	-55 to 85	Active	RoHS3 Compliant
1825057-3	TE Connectivity ALCOSWITCH	SPST	4	100	24	Through Hole	PC Pin	0.228	-30 to 85	Active	RoHS3 Compliant
DM04	APEM Inc.	SPST	4	25	24	Surface Mount	Gull Wing	0.173	-20 to 85	Active	RoHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SD04H1SB (C&K) is the direct equivalent replacement. It maintains identical electrical and mechanical specifications, offers active product status ensuring long-term availability, and carries RoHS3 compliance for regulatory adherence. Contact material differs (beryllium copper vs. copper alloy), but both materials meet the gold-plated contact finish requirement.

Secondary Recommendations: The CTS Electrocomponents 219 series (219-4MST, 219-4ESF, 219-4ESRF, 219-4MSF, 219-4MSRF, 219-4MSTF, 219-4MSTRF) are compatible substitutes for applications where 20VDC rating is acceptable within a 25VDC design margin. All variants maintain 100mA current capacity, surface mount gull wing termination, and 0.100" pitch. Selection among variants depends on packaging requirements (tube, tape & reel, or cut tape) and washability specifications. Extended temperature range (-55°C to 85°C) provides additional operational margin.

Conditional Recommendation: 1825057-3 (TE Connectivity ALCOSWITCH) is suitable only for designs where through-hole mounting can be accommodated. Surface mount PCB layouts require SD04H1SB or CTS 219 series alternatives.

Not Recommended: DM04 (APEM Inc.) has insufficient current rating (25mA vs. 100mA requirement) and is unsuitable for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can SD04H1SB directly replace SD04H1SK without PCB layout changes?

A: Yes. SD04H1SB is dimensionally and electrically identical to SD04H1SK. Both use surface mount gull wing termination with 0.100" pitch and 0.180" height above board. No PCB modifications are required.

Q: Are CTS 219 series switches compatible with a 25VDC design?

A: CTS 219 series switches are rated for 20VDC. In applications where the design voltage is 25VDC, these parts operate below their rated maximum. Compatibility depends on actual operating voltage and design margin requirements. If the circuit operates at or below 20VDC, CTS 219 series parts are fully compatible.

Q: What is the difference between 219-4MST, 219-4ESRF, and 219-4MSTRF?

A: All three are electrically identical SPST 4-position switches with 100mA at 20VDC. Differences are in packaging and features: 219-4MST uses tube packaging without epoxy sealing; 219-4ESRF uses tape & reel packaging with epoxy sealed terminals; 219-4MSTRF uses cut tape & Digi-Reel packaging with epoxy sealed terminals and washability. Select based on assembly process requirements and environmental protection needs.

Q: Why is 1825057-3 listed as a similar part if it uses through-hole mounting?

A: 1825057-3 meets all electrical specifications (SPST, 4-position, 100mA, 24VDC) and mechanical parameters (slide actuator, gold contact finish, 0.100" pitch). However, through-hole termination (PC pin) differs from surface mount gull wing termination, limiting substitution to applications where mounting type flexibility exists or PCB redesign is acceptable.

Q: Is DM04 a viable substitute?

A: No. DM04 has a current rating of 25mA, which is insufficient for the 100mA requirement of SD04H1SK. This part is not suitable for direct substitution.

Q: What compliance certifications should I verify for production use?

A: All active substitute parts (SD04H1SB, CTS 219 series, 1825057-3, DM04) carry RoHS3 compliance and REACH unaffected status. The original SD04H1SK is RoHS non-compliant. For new designs or production requiring regulatory compliance, use only RoHS3 compliant alternatives.

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