DS03T DIP Switch SPST 24VDC Equivalent & Substitute Parts

Part Overview

The DS03T is a 3-position DIP switch manufactured by APEM Inc., designed for through-hole PCB mounting with SPST (Single Pole Single Throw) circuit configuration. This component operates at 24VDC with a 50mA current rating and features a standard slide actuator with gold-plated phosphor bronze contacts. The DS03T is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity.

Key Parameters

Parameter	DS03T Specification
Circuit Configuration	SPST
Number of Positions	3
Voltage Rating	24VDC
Current Rating	50mA
Actuator Type	Slide (Standard)
Mounting Type	Through Hole
Pitch	0.100" (2.54mm)
Contact Finish	Gold
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the DS03T is determined by strict alignment across the following critical parameters:

Circuit Configuration: Must be SPST
Number of Positions: Must be 3
Voltage Rating: Must be 24VDC
Actuator Type: Must be Slide (Standard)
Mounting Type: Must be Through Hole
Pitch: Must be 0.100" (2.54mm)
Contact Finish: Must be Gold
RoHS Compliance: Must be ROHS3 Compliant

The identified substitute parts meet these core electrical and mechanical requirements. Variations in current rating, operating temperature range, mechanical life, and physical dimensions are noted but do not preclude substitution when the application's actual operating parameters fall within the substitute part's specifications.

Parameter Comparison

Parameter	DS03T (APEM)	206-3ST (CTS)	KAS1103E (E-Switch)
Manufacturer	APEM Inc.	CTS Electrocomponents	E-Switch
Product Status	Obsolete	Active	Active
Circuit	SPST	SPST	SPST
Number of Positions	3	3	3
Voltage Rating	24VDC	24VDC	24VDC
Current Rating	50mA	50mA	25mA
Actuator Type	Slide (Standard)	Slide (Standard)	Slide (Standard)
Actuator Level	Raised	Raised	Raised
Contact Finish	Gold	Gold	Gold
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 ~ 70°C	-55°C ~ 85°C	-40°C ~ 85°C
Electrical Life	2,000 Cycles	10,000 Cycles	2,000 Cycles
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

206-3ST (CTS Electrocomponents): This part maintains full electrical and mechanical compatibility with the DS03T across all critical parameters. The 206-3ST is currently in active production status with higher electrical life rating (10,000 cycles versus 2,000 cycles) and extended operating temperature range (-55°C ~ 85°C). This part is suitable for direct substitution in applications where the DS03T is specified.

KAS1103E (E-Switch): This part meets all core substitution criteria with matching circuit configuration, voltage rating, actuator type, and mounting specifications. The current rating is 25mA, which is lower than the DS03T's 50mA specification. The KAS1103E is suitable for substitution only in applications where the actual circuit current draw does not exceed 25mA. This part is currently in active production status and carries ROHS3 compliance and REACH unaffected certification.

Both substitute parts carry ROHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the original DS03T.

Frequently Asked Questions (FAQ)

Q: Can the 206-3ST replace the DS03T in all applications? A: The 206-3ST meets all electrical and mechanical compatibility requirements for the DS03T. Substitution is valid provided the application's operating temperature range falls within -55°C ~ 85°C and the circuit design accommodates the physical dimensions of the 206-3ST (height 0.334" versus DS03T height 0.271").

Q: Is the KAS1103E suitable for high-current applications? A: The KAS1103E has a current rating of 25mA. It is suitable only for applications where the actual circuit current does not exceed 25mA. For applications requiring the full 50mA rating of the DS03T, the 206-3ST is the appropriate choice.

Q: What are the key differences in physical dimensions? A: The DS03T has a height of 0.271" (6.88mm) and length of 0.360" (9.14mm). The 206-3ST measures 0.334" (8.48mm) in height and 0.386" (9.80mm) in length. The KAS1103E measures 0.275" (6.99mm) in height and 0.354" (8.99mm) in length. PCB layout and clearance requirements must be verified for each substitute.

Q: Are both substitute parts currently available? A: The 206-3ST and KAS1103E are both classified as active products. Inventory availability should be confirmed with the respective manufacturers or authorized distributors.

Q: Do the substitute parts require any design modifications? A: Both substitute parts use identical pitch (0.100" / 2.54mm) and PC pin termination, allowing direct PCB footprint compatibility. Physical height and length variations must be evaluated for mechanical clearance in the target application.

Q: What is the washability difference between parts? A: The DS03T and 206-3ST are both washable. The KAS1103E is not washable. If post-assembly cleaning is required, the DS03T or 206-3ST must be specified.

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