BPA02SK Piano DIP Switch SPST Equivalent & Substitute Parts

Part Overview

The BPA02SK is a surface mount piano DIP switch manufactured by C&K, featuring SPST (Single Pole Single Throw) configuration with 2 positions. This component is rated for 100mA at 5VDC and is designed for applications requiring compact, right-angle mounted switching solutions. The BPA02SK is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity.

Substiute Parts

BPA02SK

C&KIn Stock: 742BPA02SK Datasheet

Current PartRFQ

BPA02SB

C&KIn Stock: 29031BPA02SB Datasheet

DirectRFQ

193-2MS

CTS ElectrocomponentsIn Stock: 1303193-2MS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BPA02SK is determined by strict alignment with the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration (SPST required)
• Number of positions (2 required)
• Mounting type (Surface Mount, Right Angle required)
• Pitch spacing (0.100" / 2.54mm required)
• Termination style (Gull Wing required)

Secondary Compatibility Criteria:

• Current rating must equal or exceed 100mA
• Voltage rating must equal or exceed 5VDC
• Height above board tolerance within application constraints
• Operating temperature range must encompass -20°C ~ 85°C

Identified Substitutes:

BPA02SB (C&K): Meets all primary and secondary compatibility criteria. Identical circuit, positions, mounting configuration, and pitch. Current and voltage ratings match or exceed requirements. Product status is Active, ensuring ongoing availability.

193-2MS (CTS Electrocomponents): Meets all primary compatibility criteria. Identical circuit, positions, mounting configuration, and pitch. Current rating of 50mA is below the 100mA requirement of the original part; voltage rating of 24VDC exceeds the 5VDC requirement. Height above board is 0.359" versus 0.274" for the original part. This substitute is suitable only for applications where the reduced current rating and increased height do not present design constraints.

Parameter Comparison

Engineering Selection Recommendations

BPA02SB (Recommended Primary Substitute): This part is the optimal substitute for the BPA02SK. It maintains identical electrical specifications (100mA at 5VDC), mechanical configuration, and pitch spacing. The BPA02SB is manufactured by the same supplier (C&K) and carries Active product status, ensuring long-term availability. The part achieves ROHS3 compliance, addressing regulatory requirements that the obsolete BPA02SK does not meet. Contact material and finish differ (Beryllium Copper with Gold plating versus Phosphor Bronze with Tin), providing improved contact reliability and corrosion resistance.

193-2MS (Conditional Substitute): This CTS Electrocomponents part provides an alternative when the reduced current rating of 50mA is acceptable for the application. The increased height above board (0.359" versus 0.274") must be evaluated against PCB layout constraints. The 193-2MS offers extended electrical life (7,000 cycles versus 1,000 cycles) and an expanded operating temperature range (-40°C ~ 85°C). This part is suitable for applications with lower current demands and where the additional height does not create design conflicts. ROHS3 compliance is achieved.

Frequently Asked Questions (FAQ)

Q: Can the BPA02SB directly replace the BPA02SK without PCB layout modifications?

A: Yes. The BPA02SB maintains identical pitch spacing (0.100" / 2.54mm), height above board (0.274" / 6.95mm), and mounting configuration (Surface Mount, Right Angle with Gull Wing termination). No PCB footprint changes are required.

Q: What is the primary difference between BPA02SK and BPA02SB?

A: The BPA02SB uses Beryllium Copper contacts with Gold plating, compared to Phosphor Bronze with Tin plating in the BPA02SK. Both maintain identical electrical ratings (100mA at 5VDC) and mechanical specifications. The BPA02SB achieves ROHS3 compliance, while the BPA02SK does not.

Q: Is the 193-2MS suitable as a direct replacement?

A: The 193-2MS is mechanically compatible but has electrical limitations. The current rating is 50mA, which is below the original 100mA specification. The height above board is 0.359" compared to 0.274" for the original part. Use this substitute only if the application current requirement does not exceed 50mA and the increased height does not conflict with PCB design constraints.

Q: What are the compliance differences between these parts?

A: The BPA02SK is RoHS non-compliant. Both BPA02SB and 193-2MS achieve ROHS3 compliance. All three parts are REACH Unaffected and classified as EAR99 for export control purposes.

Q: How do the contact materials affect performance?

A: The BPA02SB uses Beryllium Copper with Gold plating, providing superior corrosion resistance and contact reliability compared to the Phosphor Bronze with Tin plating used in the BPA02SK. The Gold finish in the BPA02SB reduces oxidation and improves long-term contact stability.

Q: What packaging options are available?

A: The BPA02SK was supplied in standard packaging (not specified). The BPA02SB is available in Tube packaging. The 193-2MS is also available in Tube packaging. Confirm packaging requirements with your procurement specifications.