SDA04H1KD Equivalent & Substitute Parts

Part Overview

The SDA04H1KD is a DIP slide switch manufactured by C&K, configured as a 4-position SPST switch rated for 25mA at 24VDC. This component features through-hole mounting with PC pin termination and gold-plated beryllium copper contacts. The part is currently obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Circuit Configuration	SPST (Single Pole Single Throw)
Number of Positions	4
Current Rating	25mA
Voltage Rating	24VDC
Actuator Type	Slide (Standard)
Mounting Type	Through Hole
Pitch	0.100" (2.54mm)
Height Above Board	0.228" (5.80mm)
Termination Style	PC Pin
Operating Temperature Range	-20°C ~ 85°C

Substitute Part Grouping Explanation

Substitution eligibility for the SDA04H1KD is determined by the following critical parameters:

Circuit Configuration & Position Count: All substitutes must maintain SPST topology with 4 positions to ensure functional equivalence in switching applications.
Voltage Rating: 24VDC rating is mandatory; no deviations are acceptable.
Mounting & Pitch: Through-hole mounting with 0.100" (2.54mm) pitch ensures PCB compatibility without layout modifications.
Actuator Type: Slide actuator with raised level maintains mechanical interface consistency.
Termination: PC pin termination is required for direct socket compatibility.

Current rating and contact material represent allowable variation parameters. Substitutes with equal or higher current ratings (25mA minimum) are functionally compatible. Contact material and finish variations are acceptable provided electrical performance meets or exceeds the original specification.

Parameter Comparison

Parameter	SDA04H1KD (Main)	SDA04H1BD (Substitute)	1825057-3 (Substitute)
Manufacturer	C&K	C&K	TE Connectivity ALCOSWITCH
Circuit Configuration	SPST	SPST	SPST
Number of Positions	4	4	4
Current Rating	25mA	25mA	100mA
Voltage Rating	24VDC	24VDC	24VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Slide (Standard)
Height Above Board	0.228" (5.80mm)	0.228" (5.80mm)	0.228" (5.80mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Termination Style	PC Pin	PC Pin	PC Pin
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Operating Temperature	-20°C ~ 85°C	-40°C ~ 85°C	-30°C ~ 85°C
Mechanical Life	1,000 Cycles	1,000 Cycles	1,000 Cycles
Electrical Life	1,000 Cycles	1,000 Cycles	1,000 Cycles
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SDA04H1BD is the primary substitute for the SDA04H1KD. Both components are manufactured by C&K within the SDA series and share identical electrical and mechanical specifications. The SDA04H1BD offers improved product status (Active vs. Obsolete) and ROHS3 compliance, making it the preferred choice for new designs and production continuity. The extended operating temperature range (-40°C vs. -20°C minimum) provides additional thermal margin. Packaging is supplied in tube format.

1825057-3 is a secondary substitute manufactured by TE Connectivity ALCOSWITCH. This component maintains all critical switching parameters and pitch specifications but features a higher current rating (100mA vs. 25mA), making it suitable for applications requiring increased current capacity. The 1825057-3 includes washable construction and ROHS3 compliance. This substitute is appropriate when current headroom or enhanced environmental resistance is required.

Both substitutes are active products with current inventory availability and full regulatory compliance, ensuring long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the SDA04H1BD directly replace the SDA04H1KD without PCB modifications?

A: Yes. Both components share identical pitch (0.100"), height above board (0.228"), and through-hole PC pin termination. No layout changes are required for direct substitution.

Q: What is the primary difference between SDA04H1KD and SDA04H1BD?

A: The SDA04H1BD is the active production equivalent. Key differences include product status (Active vs. Obsolete), RoHS compliance (ROHS3 vs. Non-compliant), body material (PPS vs. PPA), and extended operating temperature range (-40°C to 85°C vs. -20°C to 85°C).

Q: When should 1825057-3 be selected over SDA04H1BD?

A: The 1825057-3 is selected when the application requires current capacity exceeding 25mA, up to 100mA. It also provides washable construction for applications involving cleaning processes. Both are ROHS3 compliant active products.

Q: Are there packaging differences between the substitutes?

A: Both SDA04H1BD and 1825057-3 are supplied in tube packaging. The original SDA04H1KD packaging format is not specified in available data.

Q: Do all three parts maintain the same mechanical life rating?

A: Yes. All three components are rated for 1,000 mechanical and electrical cycles, ensuring equivalent operational durability.

Q: Is the SDA04H1KD still available for purchase?

A: The SDA04H1KD is obsolete. Active substitutes (SDA04H1BD and 1825057-3) are recommended for all new applications and ongoing production requirements.

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