BPA09SK Equivalent & Substitute Parts

Part Overview

The BPA09SK is a 9-position DIP switch manufactured by C&K, featuring a piano actuator with SPST (Single Pole Single Throw) circuit configuration. This surface mount component is rated for 100mA at 5VDC and is designed for applications requiring reliable switching in compact form factors. The BPA09SK is currently classified as obsolete, making identification of compatible substitute parts essential for ongoing production support and design continuity.

Substiute Parts

BPA09SK

C&KIn Stock: 987BPA09SK Datasheet

Current PartRFQ

BPA09SB

C&KIn Stock: 890BPA09SB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The BPA09SB qualifies as a direct substitute for the BPA09SK based on the following critical parameters that determine functional compatibility:

• Circuit Configuration: Both parts maintain SPST topology
• Position Count: Both feature 9-position configuration
• Electrical Ratings: Identical 100mA current and 5VDC voltage specifications
• Physical Dimensions: Matching height (0.274"), pitch (0.100"), and length (0.976")
• Mounting Characteristics: Identical surface mount, right angle orientation with gull wing termination
• Operating Temperature: Identical -20°C to 85°C range
• Mechanical and Electrical Life: Both rated for 1,000 cycles

Differences in contact material (Phosphor Bronze vs. Beryllium Copper) and contact finish (Tin vs. Gold) do not affect functional substitution within the specified electrical parameters. The BPA09SB represents an active product with improved compliance status.

Parameter Comparison

Engineering Selection Recommendations

The BPA09SB is the appropriate substitute for the obsolete BPA09SK. The transition is supported by:

• Product Status: The BPA09SB maintains active production status, ensuring long-term availability and supply chain continuity
• Regulatory Compliance: The BPA09SB achieves RoHS3 compliance, whereas the BPA09SK is non-compliant. For applications subject to RoHS directives, the BPA09SB is the required selection
• Functional Equivalence: All critical electrical and mechanical parameters remain identical, ensuring direct PCB compatibility without design modification
• Environmental Certifications: Both parts maintain identical REACH and MSL classifications

Selection of the BPA09SB eliminates obsolescence risk while maintaining full functional compatibility with existing designs.

Frequently Asked Questions (FAQ)

Q: Can the BPA09SB be used as a direct replacement for the BPA09SK without PCB modifications?

A: Yes. The BPA09SB maintains identical pitch (0.100"), height (0.274"), termination style (gull wing), and mounting orientation (surface mount, right angle). No PCB layout changes are required.

Q: What is the significance of the contact material difference between these parts?

A: The BPA09SK uses Phosphor Bronze contacts with tin finish, while the BPA09SB uses Beryllium Copper contacts with gold finish. Both configurations meet the specified 100mA at 5VDC electrical requirements. The gold finish in the BPA09SB provides enhanced corrosion resistance and contact reliability.

Q: Why is RoHS compliance important for this substitution?

A: RoHS3 compliance is a regulatory requirement in many markets. The BPA09SB's compliance status makes it suitable for applications subject to RoHS directives, whereas the BPA09SK cannot be used in such applications.

Q: Are there packaging differences between these parts?

A: The BPA09SK is listed with no specified packaging, while the BPA09SB is supplied in tube packaging. This does not affect functional performance or PCB compatibility.

Q: Do both parts have the same mechanical and electrical life ratings?

A: Yes. Both the BPA09SK and BPA09SB are rated for 1,000 mechanical cycles and 1,000 electrical cycles, ensuring equivalent operational durability.

Q: Is the operating temperature range identical for both parts?

A: Yes. Both parts operate across the -20°C to 85°C temperature range with no performance variation.