BP03KE DIP Switch SPST Equivalent & Substitute Parts

Part Overview

The BP03KE is a slide-actuated DIP switch manufactured by C&K, designed for through-hole, right-angle mounting applications requiring single-pole, single-throw (SPST) switching at 5VDC with 100mA current capacity. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity. The BP03KE operates across a temperature range of -20°C to 60°C with 2,000 mechanical and electrical life cycles, suitable for applications where standard slide actuation and compact form factor are required.

Key Parameters

Parameter	BP03KE Value
Circuit Configuration	SPST
Number of Positions	3
Current Rating	100mA
Voltage Rating	5VDC
Actuator Type	Slide (Standard)
Mounting Type	Through Hole, Right Angle
Pitch	0.100" (2.54mm)
Contact Material	Phosphor Bronze
Contact Finish	Gold
Termination Style	PC Pin
Mechanical Life	2,000 Cycles
Electrical Life	2,000 Cycles
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

The KAP1103E from E-Switch qualifies as a functional substitute based on the following critical parameters:

Matching Parameters:

Circuit configuration: SPST (single-pole, single-throw)
Number of positions: 3
Mounting type: Through hole, right angle
Pitch: 0.100" (2.54mm), full
Contact material: Phosphor bronze
Contact finish: Gold
Termination style: PC pin
Mechanical life: 2,000 cycles
Electrical life: 2,000 cycles
RoHS compliance: Both parts meet regulatory requirements

Differing Parameters: The KAP1103E operates at 24VDC with 25mA current capacity, compared to the BP03KE's 5VDC/100mA specification. The KAP1103E uses a piano actuator rather than a slide actuator, and features a wider operating temperature range (-40°C to 85°C versus -20°C to 60°C). These differences require application-level evaluation to confirm compatibility with existing circuit requirements.

Parameter Comparison

Parameter	BP03KE (C&K)	KAP1103E (E-Switch)
Circuit	SPST	SPST
Positions	3	3
Current Rating	100mA	25mA
Voltage Rating	5VDC	24VDC
Actuator Type	Slide (Standard)	Piano
Height Above Board	0.315" (8.00mm)	0.402" (10.20mm)
Length	0.406" (10.31mm)	0.361" (9.17mm)
Operating Temperature	-20°C ~ 60°C	-40°C ~ 85°C
Body Material	Polyester (PET), Glass Filled	Polybutylene Terephthalate (PBT), Glass Filled
Mounting	Through Hole, Right Angle	Through Hole, Right Angle
Pitch	0.100" (2.54mm)	0.100" (2.54mm)
Contact Material	Phosphor Bronze	Phosphor Bronze
Contact Finish	Gold	Gold
Mechanical Life	2,000 Cycles	2,000 Cycles
Electrical Life	2,000 Cycles	2,000 Cycles
Product Status	Obsolete	Active
RoHS Status	RoHS Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The KAP1103E is available as an active product from E-Switch with current manufacturing support and ROHS3 compliance, addressing the obsolescence status of the BP03KE. Both parts meet EAR99 export classification and REACH unaffected status.

Selection of the KAP1103E requires confirmation that the application circuit accommodates the 24VDC operating voltage and 25mA maximum current, which differ from the BP03KE baseline. The piano actuator mechanism differs functionally from the slide actuator, affecting user interface characteristics. The KAP1103E's extended operating temperature range (-40°C to 85°C) provides broader environmental capability compared to the BP03KE specification.

Frequently Asked Questions (FAQ)

Q: Can the KAP1103E directly replace the BP03KE in existing designs?

A: Direct replacement requires circuit-level compatibility verification. The KAP1103E operates at 24VDC with 25mA maximum current, whereas the BP03KE is rated for 5VDC at 100mA. Applications must confirm that the target voltage and current specifications align with the KAP1103E ratings. The piano actuator differs mechanically from the slide actuator, affecting tactile feedback and user operation.

Q: What are the critical substitution criteria for these DIP switches?

A: Substitution is based on matching circuit configuration (SPST), position count (3), mounting type (through hole, right angle), pitch (0.100"), contact material and finish (phosphor bronze with gold plating), and termination style (PC pin). Mechanical and electrical life cycles (2,000 each) are equivalent. Voltage and current ratings, actuator type, and operating temperature ranges are application-dependent and must be evaluated separately.

Q: Are there packaging differences between these parts?

A: The BP03KE is supplied in standard packaging, while the KAP1103E is packaged in tubes. Both use PC pin termination suitable for through-hole PCB assembly. Physical dimensions differ slightly: the KAP1103E is shorter in length (0.361" versus 0.406") but taller above the board (0.402" versus 0.315").

Q: Do both parts meet current regulatory requirements?

A: The BP03KE carries RoHS Compliant status, while the KAP1103E meets the more recent ROHS3 Compliant standard. Both are REACH unaffected and classified as EAR99 for export purposes. The KAP1103E's ROHS3 compliance provides alignment with current regulatory frameworks.

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