DP04 DIP Switch SPST 4-Position Piano Actuator Equivalent & Substitute Parts

Part Overview

The DP04 is a through-hole DIP switch manufactured by APEM Inc., featuring a 4-position SPST configuration with piano actuator and 50mA/24VDC rating. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The DP04 remains available in inventory (720 pcs) but alternative active-status components provide functional compatibility for new designs and production requirements.

Key Parameters

Parameter	Value
Circuit Configuration	SPST (Single Pole Single Throw)
Number of Positions	4
Voltage Rating	24VDC
Current Rating	50mA
Actuator Type	Piano
Mounting Type	Through Hole, Right Angle
Pitch	0.100" (2.54mm)
Termination Style	PC Pin
Operating Temperature Range	-20°C ~ 70°C
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the DP04 is determined by the following critical parameters:

Primary Compatibility Criteria:

Circuit configuration: SPST
Number of positions: 4
Voltage rating: 24VDC minimum
Mounting type: Through hole, right angle
Pitch: 0.100" (2.54mm)
Termination style: PC pin

Secondary Considerations:

Current rating: Substitute must support minimum 50mA or lower (if application permits)
Actuator type: Piano
Operating temperature range: Must encompass application requirements
RoHS and MSL compliance: Must match or exceed original specification

Two substitute parts meet these criteria with documented compatibility:

NDP-04-V (APEM Inc.) – Same manufacturer, reduced current rating (25mA), active product status
KAP1104E (E-Switch) – Cross-manufacturer equivalent, reduced current rating (25mA), active product status, extended temperature range

Parameter Comparison

Parameter	DP04 (Main)	NDP-04-V (Substitute)	KAP1104E (Substitute)
Manufacturer	APEM Inc.	APEM Inc.	E-Switch
Product Status	Obsolete	Active	Active
Circuit Configuration	SPST	SPST	SPST
Number of Positions	4	4	4
Current Rating (Amps)	50mA	25mA	25mA
Voltage Rating	24VDC	24VDC	24VDC
Actuator Type	Piano	Piano	Piano
Actuator Level	Flush, Recessed	Flush, Recessed	Raised
Height Above Board	0.402" (10.20mm)	0.402" (10.20mm)	0.402" (10.20mm)
Length	0.461" (11.71mm)	0.450" (11.42mm)	0.461" (11.71mm)
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Termination Style	PC Pin	PC Pin	PC Pin
Contact Finish	Gold	Gold	Gold
Operating Temperature	-20°C ~ 70°C	-20°C ~ 70°C	-40°C ~ 85°C
Electrical Life	2,000 Cycles	2,000 Cycles	2,000 Cycles
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

NDP-04-V Selection Criteria:

Preferred for same-manufacturer continuity with APEM Inc. product line
Active product status ensures long-term availability and supply chain stability
Current rating reduction from 50mA to 25mA requires circuit validation; suitable for applications with maximum load current ≤25mA
Identical operating temperature range and mechanical specifications
Marginal length difference (0.450" vs 0.461") is negligible for PCB layout compatibility

KAP1104E Selection Criteria:

Cross-manufacturer alternative from E-Switch with active product status
Extended operating temperature range (-40°C ~ 85°C) provides thermal margin beyond DP04 specification
Current rating reduction to 25mA requires circuit validation
Raised actuator level differs from DP04 flush/recessed design; verify panel cutout and user interface requirements
Identical pitch, termination, and electrical life specifications
ROHS3 and MSL compliance maintained

Selection Logic: Both substitutes are electrically and mechanically compatible with DP04 applications operating at ≤25mA. NDP-04-V is recommended for direct replacement within existing APEM product ecosystems. KAP1104E is recommended for applications requiring extended temperature performance or when E-Switch supply chain integration is preferred. Current rating reduction is the primary design constraint; applications exceeding 25mA require alternative component selection.

Frequently Asked Questions (FAQ)

Q: Can NDP-04-V or KAP1104E directly replace DP04 in existing designs?

A: Both parts are mechanically and electrically compatible for applications with maximum current draw ≤25mA. The DP04 50mA rating exceeds both substitutes; circuit analysis is required to confirm application current requirements do not exceed 25mA.

Q: What is the impact of the KAP1104E raised actuator level versus DP04 flush/recessed design?

A: Actuator level affects panel interface and user accessibility. Raised actuators protrude further from the PCB surface. Panel cutout dimensions and user interaction requirements must be evaluated for mechanical compatibility.

Q: Are all three parts pin-compatible?

A: Yes. All three components share identical pitch (0.100"/2.54mm), termination style (PC pin), and through-hole right-angle mounting configuration. PCB footprints are interchangeable.

Q: Do NDP-04-V and KAP1104E meet the same compliance standards as DP04?

A: Yes. Both substitutes are ROHS3 compliant and carry MSL 1 (Unlimited) rating, matching DP04 environmental and regulatory compliance.

Q: What is the primary limitation when substituting DP04 with NDP-04-V or KAP1104E?

A: Current rating reduction from 50mA to 25mA is the primary constraint. Applications designed for DP04's full 50mA capacity require circuit redesign or alternative component selection.

Q: Is NDP-04-V or KAP1104E preferred for new designs?

A: Both are active-status products suitable for new designs. NDP-04-V maintains APEM manufacturer continuity. KAP1104E offers extended temperature range (-40°C ~ 85°C) for applications requiring broader thermal performance.

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