KST221G Equivalent & Substitute Parts

Part Overview

The KST221G is a tactile switch manufactured by C&K, classified as SPST-NO (Single Pole Single Throw - Normally Open) with a contact rating of 0.05A at 32VDC. This component is designed for surface mount applications with top actuation and gull wing termination. The KST221G is currently listed as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Substiute Parts

KST221G

C&KIn Stock: 5801KST221G Datasheet

Current PartRFQ

KST221GLFS

C&KIn Stock: 5433KST221GLFS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KST221G is determined by strict equivalence across the following critical parameters:

• Circuit configuration (SPST-NO)
• Contact rating (0.05A @ 32VDC)
• Mounting type (Surface Mount)
• Physical outline (6.20mm x 6.20mm)
• Actuator height (5.00mm)
• Actuator orientation (Top Actuated)
• Termination style (Gull Wing)
• Operating force (200gf)
• Switch travel (1.30mm)
• Operating temperature range (-40°C to 85°C)
• Mechanical life (100,000 Cycles)
• Ingress protection (IP40)

The KST221GLFS meets all these criteria and is classified as a direct substitute. The primary distinction between the main part and its substitute is product status and packaging configuration.

Parameter Comparison

Engineering Selection Recommendations

The KST221GLFS is the direct functional equivalent of the KST221G. Both parts share identical electrical and mechanical specifications across all critical parameters. The KST221GLFS is recommended for new designs and production continuity due to its active product status.

Key differentiators between the two parts are:

• Product Status: KST221GLFS is active, while KST221G is obsolete
• RoHS Compliance: KST221GLFS is ROHS3 compliant, while KST221G is non-compliant
• Packaging: KST221GLFS is supplied in Tape & Reel format, while KST221G is supplied in bulk

For applications requiring RoHS3 compliance or long-term supply assurance, the KST221GLFS is the appropriate selection. Both parts are REACH unaffected and classified under ECCN EAR99.

Frequently Asked Questions (FAQ)

Q: Can KST221GLFS be used as a direct replacement for KST221G in existing designs?

A: Yes. The KST221GLFS is electrically and mechanically equivalent to the KST221G. All functional parameters, including contact rating, switching characteristics, physical dimensions, and operating conditions, are identical. PCB layout and schematic integration require no modification.

Q: What is the primary reason to transition from KST221G to KST221GLFS?

A: The KST221G is obsolete, while the KST221GLFS maintains active product status with ongoing manufacturer support. Additionally, the KST221GLFS is ROHS3 compliant, addressing regulatory requirements that may apply to end-use applications.

Q: Are there packaging considerations when switching from KST221G to KST221GLFS?

A: Yes. The KST221G is supplied in bulk packaging, while the KST221GLFS is supplied in Tape & Reel (TR) format. This difference affects handling, storage, and automated assembly processes. Tape & Reel packaging is standard for high-volume surface mount production and provides improved component protection during transport and storage.

Q: Do the electrical specifications differ between these parts?

A: No. Both parts are rated for 0.05A at 32VDC with SPST-NO configuration. Operating temperature range, mechanical life, and ingress protection ratings are identical.

Q: Is the KST221GLFS compatible with the same PCB footprint as the KST221G?

A: Yes. Both parts have identical outline dimensions (6.20mm x 6.20mm), actuator height (5.00mm), and gull wing termination. No PCB redesign is required.