DP03 Piano DIP Switch SPST Equivalent & Substitute Parts

Part Overview

The DP03 is a 3-position piano DIP switch manufactured by APEM Inc., configured as a single-pole single-throw (SPST) switch rated for 50mA at 24VDC. The switch features a through-hole, right-angle mounting with PC pin termination and a flush, recessed piano actuator. The DP03 is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system maintenance and new design implementations where this component is specified.

Key Parameters

Parameter	DP03 Specification
Circuit Configuration	SPST
Number of Positions	3
Current Rating	50mA
Voltage Rating	24VDC
Actuator Type	Piano
Actuator Level	Flush, Recessed
Mounting Type	Through Hole, Right Angle
Termination Style	PC Pin
Pitch	0.100" (2.54mm)
Height Above Board	0.402" (10.20mm)
Operating Temperature Range	-20°C to 70°C
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the DP03 is determined by strict equivalence across the following critical parameters: circuit configuration (SPST), number of positions (3), voltage rating (24VDC), actuator type (piano), mounting type (through hole, right angle), termination style (PC pin), and pitch (0.100"). Current rating tolerance is the primary variable allowing substitution, provided the substitute part meets or exceeds the application requirement. The DP03 operates at 50mA; substitutes rated at 25mA are acceptable only for applications drawing 25mA or less.

Two substitute parts meet these criteria:

NDP-03-V (APEM Inc.): Maintains identical mechanical and electrical interface specifications with reduced current rating (25mA). Active product status provides ongoing availability.

KAP1103E (E-Switch): Maintains identical mechanical and electrical interface specifications with reduced current rating (25mA). Active product status and extended operating temperature range (-40°C to 85°C) provide enhanced environmental capability.

Parameter Comparison

Parameter	DP03	NDP-03-V	KAP1103E
Manufacturer	APEM Inc.	APEM Inc.	E-Switch
Circuit Configuration	SPST	SPST	SPST
Number of Positions	3	3	3
Current Rating (Amps)	50mA	25mA	25mA
Voltage Rating	24VDC	24VDC	24VDC
Actuator Type	Piano	Piano	Piano
Actuator Level	Flush, Recessed	Flush, Recessed	Raised
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle
Termination Style	PC Pin	PC Pin	PC Pin
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Height Above Board	0.402" (10.20mm)	0.402" (10.20mm)	0.402" (10.20mm)
Operating Temperature Range	-20°C to 70°C	-20°C to 70°C	-40°C to 85°C
Contact Material	Phosphor Bronze	Not specified	Phosphor Bronze
Contact Finish	Gold	Gold	Gold
Electrical Life	2,000 Cycles	2,000 Cycles	2,000 Cycles
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

Both NDP-03-V and KAP1103E are active products with ROHS3 compliance and REACH unaffected status, providing regulatory continuity with the obsolete DP03.

NDP-03-V Selection: Choose this substitute when maintaining single-source procurement from APEM Inc. is preferred and application current draw does not exceed 25mA. Operating temperature range matches the DP03 specification.

KAP1103E Selection: Choose this substitute when application current draw does not exceed 25mA and extended operating temperature capability (-40°C to 85°C) is beneficial. This part accommodates wider environmental conditions than the DP03 and provides cross-manufacturer sourcing flexibility.

Current Rating Constraint: Both substitutes are rated at 25mA maximum. Applications requiring the full 50mA capability of the DP03 cannot use these substitutes without exceeding component ratings.

Frequently Asked Questions (FAQ)

Q: Can NDP-03-V or KAP1103E be used as direct replacements for DP03 in all applications?

A: Direct replacement is possible only if the application current draw does not exceed 25mA. The DP03 is rated for 50mA; both substitutes are rated for 25mA. Exceeding the substitute current rating will cause component failure.

Q: What is the difference between the actuator levels (flush/recessed vs. raised) on NDP-03-V and KAP1103E?

A: The NDP-03-V maintains the flush, recessed actuator level of the DP03. The KAP1103E features a raised actuator level. This difference affects tactile feedback and may impact PCB layout clearance. Verify mechanical compatibility with your application before selection.

Q: Are both substitutes available in the same packaging as the DP03?

A: The DP03 packaging is not specified in the provided data. KAP1103E is supplied in tube packaging. Confirm packaging requirements with your procurement process.

Q: Do the substitutes maintain the same electrical life as the DP03?

A: Yes. Both NDP-03-V and KAP1103E are rated for 2,000 electrical cycles, matching the DP03 specification.

Q: Which substitute offers better environmental performance?

A: KAP1103E operates across -40°C to 85°C, compared to the DP03 and NDP-03-V range of -20°C to 70°C. Select KAP1103E for applications requiring extended temperature operation.

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