BPA02K Equivalent & Substitute Parts

Part Overview

The BPA02K is a DIP switch manufactured by C&K, featuring a single-pole single-throw (SPST) configuration with 2 positions, rated for 100mA at 5VDC. This component is classified as obsolete, necessitating identification of equivalent alternatives for ongoing design support and procurement continuity. The BPA02K employs a piano actuator with through-hole, right-angle mounting and phosphor bronze contacts with tin finish.

Key Parameters

Parameter	Value
Circuit Configuration	SPST
Number of Positions	2
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 BPA02K is determined by matching the following critical parameters: circuit configuration (SPST), number of positions (2), mounting type (through hole, right angle), pitch (0.100"), and physical envelope (height and length). The substitute parts are grouped as follows:

Direct Substitute (BPA02B): Maintains identical electrical specifications (100mA, 5VDC), circuit topology, and mechanical form factor. Differs only in contact material (beryllium copper vs. phosphor bronze), contact finish (gold vs. tin), and product status (active vs. obsolete). RoHS3 compliance is achieved.

Similar Substitute (1571999-1): Maintains identical mechanical form factor, mounting configuration, and pitch. Differs in electrical ratings (25mA at 24VDC vs. 100mA at 5VDC), manufacturer (TE Connectivity ALCOSWITCH vs. C&K), and contact material (copper alloy vs. phosphor bronze). This part is suitable only for applications with compatible voltage and current requirements.

Parameter Comparison

Parameter	BPA02K (Main)	BPA02B (Direct)	1571999-1 (Similar)
Manufacturer	C&K	C&K	TE Connectivity ALCOSWITCH
Series	BPA	BPA	ADP
Product Status	Obsolete	Active	Active
Circuit Configuration	SPST	SPST	SPST
Number of Positions	2	2	2
Current Rating	100mA	100mA	25mA
Voltage Rating	5VDC	5VDC	24VDC
Actuator Type	Piano, Raised	Piano, Raised	Piano, Raised
Contact Material	Phosphor Bronze	Beryllium Copper	Copper Alloy
Contact Finish	Tin	Gold	Gold
Height Above Board	0.287" (7.30mm)	0.287" (7.30mm)	0.287" (7.30mm)
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)
Operating Temperature	-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)
REACH Status	Unaffected	Unaffected	Unaffected

Engineering Selection Recommendations

BPA02B (Direct Substitute): This part is the primary replacement for the obsolete BPA02K. It maintains electrical equivalence (100mA, 5VDC) and identical mechanical form factor. The transition from phosphor bronze/tin contacts to beryllium copper/gold contacts represents an improvement in contact reliability and corrosion resistance. BPA02B achieves ROHS3 compliance, addressing regulatory requirements that may apply to new designs. This part is recommended for direct substitution in existing BPA02K applications.

1571999-1 (Similar Substitute): This TE Connectivity part is suitable only for applications where the electrical requirements differ from the original specification. The reduced current rating (25mA vs. 100mA) and elevated voltage rating (24VDC vs. 5VDC) restrict its use to circuits designed for these parameters. The extended operating temperature range (-30°C to 85°C) provides additional thermal margin. This part is not recommended as a general replacement for BPA02K but may serve specific applications with compatible electrical requirements.

Frequently Asked Questions (FAQ)

Q: Can BPA02B be used as a direct replacement for BPA02K in all applications? A: Yes, BPA02B maintains electrical equivalence (100mA, 5VDC) and identical mechanical form factor (through-hole, right-angle, 0.100" pitch). The contact material and finish differ, but these changes represent improvements in reliability. BPA02B is suitable for direct substitution.

Q: What are the key differences between BPA02B and 1571999-1? A: BPA02B is a direct electrical equivalent (100mA, 5VDC) from the same manufacturer series. 1571999-1 is from a different manufacturer and series with different electrical ratings (25mA, 24VDC). Selection depends on circuit voltage and current requirements.

Q: Does the contact material change from phosphor bronze to beryllium copper affect circuit performance? A: Beryllium copper contacts provide superior electrical conductivity and corrosion resistance compared to phosphor bronze. For the specified application parameters (100mA, 5VDC), this change improves contact reliability and extends operational life.

Q: Is RoHS compliance a factor in selecting a substitute? A: BPA02K is RoHS non-compliant, while both BPA02B and 1571999-1 are ROHS3 compliant. For new designs or applications subject to RoHS regulations, BPA02B or 1571999-1 must be selected.

Q: Can 1571999-1 be used in a 5VDC, 100mA circuit? A: No. 1571999-1 is rated for 24VDC at 25mA maximum. Using this part in a 5VDC, 100mA circuit would exceed its current rating and result in component failure.

Q: Are the mechanical dimensions identical across all three parts? A: Yes. All three parts share identical mounting type (through-hole, right-angle), pitch (0.100"), height above board (0.287"), and length (0.276"). PCB layout compatibility is maintained across all substitutes.

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