BPA04K Equivalent & Substitute Parts

Part Overview

The BPA04K is a DIP switch manufactured by C&K, featuring a 4-position SPST configuration with piano actuator, rated for 100mA at 5VDC. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The BPA04K is designed for through-hole, right-angle mounting applications requiring low-voltage switching with mechanical actuation. Its obsolete status necessitates identification of active alternatives that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value
Circuit Configuration	SPST (Single Pole Single Throw)
Number of Positions	4
Current Rating	100mA
Voltage Rating	5VDC
Actuator Type	Piano (Raised)
Mounting Type	Through Hole, Right Angle
Pitch	0.100" (2.54mm)
Height Above Board	0.287" (7.30mm)
Operating Temperature Range	-20°C to 85°C
Mechanical Life	1,000 Cycles
Electrical Life	1,000 Cycles

Substitute Part Grouping Explanation

Substitution eligibility for the BPA04K is determined by the following critical parameters:

Circuit Configuration: Must be SPST
Number of Positions: Must be 4
Mounting Type: Must be Through Hole, Right Angle
Pitch: Must be 0.100" (2.54mm)
Height Above Board: Must be 0.287" (7.30mm)
Actuator Type: Must be Piano with Raised level
Termination Style: Must be PC Pin

Substitutes are grouped into two categories:

Direct Equivalent (BPA04B): Maintains identical electrical and mechanical specifications with the exception of contact material and finish. This part is manufactured by the same supplier (C&K) and is classified as active.

Similar Substitute (1571999-6): Meets all mechanical and mounting requirements but operates at different electrical parameters (25mA at 24VDC versus 100mA at 5VDC). This part is manufactured by TE Connectivity ALCOSWITCH Switches and is classified as active. Substitution requires circuit-level compatibility verification.

Parameter Comparison

Parameter	BPA04K (Main)	BPA04B (Direct)	1571999-6 (Similar)
Manufacturer	C&K	C&K	TE Connectivity ALCOSWITCH Switches
Product Status	Obsolete	Active	Active
Circuit Configuration	SPST	SPST	SPST
Number of Positions	4	4	4
Current Rating	100mA	100mA	25mA
Voltage Rating	5VDC	5VDC	24VDC
Actuator Type	Piano (Raised)	Piano (Raised)	Piano (Raised)
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)
Height Above Board	0.287" (7.30mm)	0.287" (7.30mm)	0.287" (7.30mm)
Operating Temperature Range	-20°C to 85°C	-20°C to 85°C	-30°C to 85°C
Mechanical Life	1,000 Cycles	1,000 Cycles	1,000 Cycles
Electrical Life	1,000 Cycles	1,000 Cycles	1,000 Cycles
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

BPA04B is the primary substitute for BPA04K applications. Both parts share identical electrical ratings (100mA at 5VDC), mechanical configuration, and operating temperature range. BPA04B is manufactured by C&K and maintains active product status with ROHS3 compliance, addressing regulatory requirements that the obsolete BPA04K does not meet. The contact material differs (Beryllium Copper with Gold finish versus Phosphor Bronze with Tin finish), but both configurations satisfy the specified electrical and mechanical performance criteria.

1571999-6 is a secondary substitute suitable only for applications where the circuit design accommodates 25mA at 24VDC operation. This part is manufactured by TE Connectivity ALCOSWITCH Switches and is classified as active with ROHS3 compliance. The extended operating temperature range (-30°C to 85°C) provides additional thermal margin compared to the BPA04K. Substitution requires verification that the host circuit can operate at the different voltage and current specifications.

Frequently Asked Questions (FAQ)

Q: Can BPA04B be used as a direct replacement for BPA04K in existing designs?

A: Yes. BPA04B maintains identical electrical ratings (100mA at 5VDC), mechanical dimensions, mounting configuration, and pitch. The contact material and finish differ, but both meet the specified performance parameters. BPA04B is active and ROHS3 compliant, addressing the obsolete status of BPA04K.

Q: What are the limitations of using 1571999-6 as a substitute?

A: The 1571999-6 operates at 25mA and 24VDC, differing from the BPA04K specification of 100mA at 5VDC. This part is suitable only for circuits designed to operate at these electrical parameters. Mechanical and mounting compatibility is maintained. Verification of circuit-level compatibility is required before substitution.

Q: Are there packaging differences between BPA04K and BPA04B?

A: BPA04K is supplied in standard packaging, while BPA04B is supplied in Tube packaging. Both maintain identical component specifications and are suitable for through-hole assembly processes.

Q: Do the substitute parts meet current regulatory requirements?

A: BPA04B and 1571999-6 are both ROHS3 compliant and classified as active products. The BPA04K is RoHS non-compliant and obsolete. Substitution with either active part addresses regulatory compliance requirements for new designs and ongoing procurement.

Q: What is the mechanical life expectancy of substitute parts?

A: Both BPA04B and 1571999-6 specify 1,000 mechanical cycles and 1,000 electrical cycles, matching the BPA04K specification. Operating life is equivalent across all three parts under their respective rated conditions.

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