BP04KE DIP Switch SPST 4-Position Equivalent & Substitute Parts

Part Overview

The BP04KE is a DIP switch manufactured by C&K, featuring SPST (Single Pole Single Throw) circuit configuration with 4 positions, rated for 100mA at 5VDC. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. The BP04KE utilizes a slide actuator with through-hole, right-angle mounting and phosphor bronze contacts finished in gold.

Key Parameters

Parameter	Value
Manufacturer Part Number	BP04KE
Manufacturer	C&K
Circuit Configuration	SPST
Number of Positions	4
Current Rating	100mA
Voltage Rating	5VDC
Actuator Type	Slide (Standard)
Mounting Type	Through Hole, Right Angle
Pitch	0.100" (2.54mm)
Product Status	Obsolete
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the BP04KE is determined by the following critical parameters:

Circuit Configuration: SPST (Single Pole Single Throw)
Number of Positions: 4
Mounting Type: Through Hole, Right Angle
Pitch: 0.100" (2.54mm)
Termination Style: PC Pin

Substitute parts must maintain compatibility across these core electrical and mechanical parameters. Variations in actuator type (slide versus piano), contact material, body material, and operating temperature ranges are permissible provided the primary functional and mechanical specifications remain aligned.

Parameter Comparison

Parameter	BP04KE (Main)	BPA04B (Direct)	KAP1104E (Similar)
Manufacturer	C&K	C&K	E-Switch
Circuit	SPST	SPST	SPST
Number of Positions	4	4	4
Current Rating (Amps)	100mA	100mA	25mA
Voltage Rating	5VDC	5VDC	24VDC
Actuator Type	Slide (Standard)	Piano	Piano
Height Above Board	0.315" (8.00mm)	0.287" (7.30mm)	0.402" (10.20mm)
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)
Contact Material	Phosphor Bronze	Beryllium Copper	Phosphor Bronze
Contact Finish	Gold	Gold	Gold
Operating Temperature	-20°C ~ 60°C	-20°C ~ 85°C	-40°C ~ 85°C
Mechanical Life	2,000 Cycles	1,000 Cycles	2,000 Cycles
Electrical Life	2,000 Cycles	1,000 Cycles	2,000 Cycles
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

BPA04B (Direct Substitute - C&K)

The BPA04B is the primary equivalent for the BP04KE. Both components are manufactured by C&K and share identical electrical specifications: SPST circuit, 4 positions, 100mA current rating, and 5VDC voltage rating. The BPA04B maintains through-hole, right-angle mounting with 0.100" pitch and PC pin termination. The BPA04B is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). The primary difference is the actuator type (piano versus slide), which does not affect electrical functionality. The BPA04B offers extended operating temperature range (-20°C ~ 85°C) and improved washability compared to the obsolete BP04KE.

KAP1104E (Similar Substitute - E-Switch)

The KAP1104E from E-Switch maintains the same circuit configuration (SPST), position count (4), mounting type (through-hole, right-angle), and pitch (0.100"). This component is rated for 25mA at 24VDC, representing a different electrical operating point. The KAP1104E is suitable for applications where the lower current requirement and higher voltage rating align with circuit design parameters. This part is in active production with ROHS3 compliance and extended operating temperature range (-40°C ~ 85°C). Mechanical and electrical life specifications match the BP04KE at 2,000 cycles.

Frequently Asked Questions (FAQ)

Q: Can the BPA04B directly replace the BP04KE in existing designs?

A: The BPA04B is electrically and mechanically compatible with the BP04KE for applications requiring 100mA at 5VDC with SPST 4-position switching. The primary difference is the actuator mechanism (piano versus slide). PCB layout compatibility depends on the identical pitch (0.100") and through-hole mounting configuration. Height above board differs slightly (0.287" versus 0.315"), which may affect enclosure clearance in space-constrained designs.

Q: When is the KAP1104E appropriate as a substitute?

A: The KAP1104E is suitable only for applications where the circuit design operates at 24VDC with maximum current requirements of 25mA. The identical mechanical footprint (0.100" pitch, through-hole, right-angle) permits PCB-level compatibility. The KAP1104E is not appropriate for 5VDC, 100mA applications due to voltage and current rating mismatches.

Q: What are the packaging differences among these parts?

A: The BP04KE is supplied in standard packaging (not specified). The BPA04B is packaged in tubes. The KAP1104E is packaged in tubes. Packaging format may affect procurement quantities and handling procedures but does not impact electrical or mechanical performance.

Q: Are all substitute parts RoHS compliant?

A: The BP04KE is RoHS Compliant. Both substitute parts (BPA04B and KAP1104E) are ROHS3 Compliant, meeting current RoHS directive requirements. All parts are REACH Unaffected and classified as EAR99 for export control purposes.

Q: What is the mechanical life difference between the BP04KE and BPA04B?

A: The BP04KE specifies 2,000 mechanical and electrical cycles. The BPA04B specifies 1,000 mechanical and electrical cycles. For applications requiring extended cycle life, the BP04KE or KAP1104E (both rated at 2,000 cycles) may be preferred, though the BPA04B remains suitable for standard switching applications.

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