BPA08K Equivalent & Substitute Parts

Part Overview

The BPA08K is an 8-position DIP switch manufactured by C&K, featuring SPST (Single Pole Single Throw) circuit configuration with piano actuator, rated for 100mA at 5VDC. This component is classified as obsolete, making identification of suitable alternatives essential for ongoing design support and production continuity. The through-hole, right-angle mounting configuration with PC pin termination and 0.100" pitch establishes the mechanical and electrical baseline for substitute evaluation.

Key Parameters

Parameter	BPA08K
Circuit Configuration	SPST
Number of Positions	8
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)
Termination Style	PC Pin
Operating Temperature Range	-20°C ~ 85°C
Mechanical Life	1,000 Cycles
Electrical Life	1,000 Cycles

Substitute Part Grouping Explanation

Substitute parts for the BPA08K are evaluated based on electrical and mechanical compatibility within the DIP switch category. The primary substitution criteria are:

Direct Electrical Compatibility: Circuit type (SPST), position count (8), actuator style (piano, raised), mounting configuration (through-hole, right-angle), pitch (0.100"), and termination (PC pin) must match or exceed the original specification.

Voltage and Current Ratings: Substitute parts must support the operating voltage and current requirements of the application. Parts with higher ratings are acceptable; parts with lower ratings are not.

Physical Dimensions: Height above board (0.287"), length (0.878"), and pitch spacing must be identical to ensure PCB layout compatibility.

Environmental Specifications: Operating temperature range and mechanical/electrical life cycles must meet or exceed the original part requirements.

The BPA08K has two identified substitutes: BPA08B (direct C&K alternative) and 2-1571999-6 (TE Connectivity cross-reference).

Parameter Comparison

Parameter	BPA08K	BPA08B	2-1571999-6
Manufacturer	C&K	C&K	TE Connectivity ALCOSWITCH
Product Status	Obsolete	Active	Active
Circuit Configuration	SPST	SPST	SPST
Number of Positions	8	8	8
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)
Length	0.878" (22.30mm)	0.878" (22.30mm)	0.878" (22.30mm)
Termination Style	PC Pin	PC Pin	PC Pin
Operating Temperature	-20°C ~ 85°C	-20°C ~ 85°C	-30°C ~ 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
Contact Material	Phosphor Bronze	Beryllium Copper	Copper Alloy
Contact Finish	Tin	Gold	Gold

Engineering Selection Recommendations

BPA08B (C&K): This is the primary substitute for the BPA08K. It maintains identical electrical ratings (100mA, 5VDC), circuit configuration (SPST, 8-position), and physical dimensions. The BPA08B is currently in active production status with ROHS3 compliance, addressing the obsolescence of the original part. The upgrade from phosphor bronze/tin contacts to beryllium copper/gold contacts provides improved contact reliability and longevity. This part is the recommended direct replacement for new designs and production continuity.

2-1571999-6 (TE Connectivity ALCOSWITCH): This part provides mechanical and form-factor compatibility but operates at different electrical parameters (25mA at 24VDC versus 100mA at 5VDC). This substitute is applicable only in applications where the circuit voltage and current requirements can be adapted to 24VDC and 25mA operation. The extended operating temperature range (-30°C to 85°C) provides additional environmental margin. This part is suitable for cross-platform designs where voltage conversion or current reduction is acceptable.

Frequently Asked Questions (FAQ)

Q: Can BPA08B be used as a direct replacement for BPA08K without PCB modifications?

A: Yes. The BPA08B maintains identical pitch (0.100"), height above board (0.287"), length (0.878"), and termination style (PC pin). No PCB layout changes are required. The electrical ratings (100mA, 5VDC) and circuit configuration (SPST, 8-position) are identical.

Q: What is the difference between BPA08K and BPA08B contact materials?

A: BPA08K uses phosphor bronze with tin finish; BPA08B uses beryllium copper with gold finish. The gold-plated beryllium copper contacts in BPA08B provide superior corrosion resistance and contact reliability compared to the tin-plated phosphor bronze in the obsolete BPA08K.

Q: Is 2-1571999-6 compatible with 5VDC, 100mA applications?

A: No. The 2-1571999-6 is rated for 24VDC at 25mA maximum. Using this part in a 5VDC, 100mA circuit would exceed its current rating and create a reliability risk. This part is suitable only for applications operating at 24VDC with current requirements not exceeding 25mA.

Q: What is the RoHS compliance status of available substitutes?

A: BPA08K is RoHS non-compliant. Both BPA08B and 2-1571999-6 are ROHS3 compliant, meeting current environmental and regulatory requirements for new product designs and manufacturing.

Q: Are there packaging differences between BPA08K and BPA08B?

A: BPA08K was supplied in bulk packaging; BPA08B is supplied in tube packaging. Both use identical component specifications and are suitable for automated assembly processes.

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