KSC121J Equivalent & Substitute Parts

Part Overview

The KSC121J 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 surface mount component features top actuation, IP67 ingress protection, and is designed for applications requiring reliable tactile feedback with minimal travel distance. The KSC121J is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing production and maintenance applications.

Substiute Parts

KSC121J

C&KIn Stock: 1080KSC121J Datasheet

Current PartRFQ

KSC121JLFS

C&KIn Stock: 6411KSC121JLFS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KSC121J is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: Must be SPST-NO
• Contact Rating: Must be 0.05A @ 32VDC
• Mounting Type: Must be Surface Mount
• Actuator Height: Must be 2.50mm vertical
• Actuator Orientation: Must be Top Actuated
• Outline Dimensions: Must be 6.20mm x 6.20mm
• Operating Force: Must be 180gf
• Switch Travel: Must be 0.30mm
• Ingress Protection: Must be IP67
• Operating Temperature Range: Must be -40°C to 85°C
• Mechanical Life: Must be 200,000 Cycles
• Termination Style: Must be J Lead

The KSC121JLFS meets all specified parameters and is classified as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The KSC121JLFS is the direct functional equivalent of the obsolete KSC121J. Both components share identical electrical and mechanical specifications across all critical parameters. The primary distinction is product status: the KSC121J is obsolete while the KSC121JLFS is active and currently in production.

The KSC121JLFS offers additional compliance advantages. It meets ROHS3 requirements, whereas the KSC121J is RoHS non-compliant. Both parts maintain REACH Unaffected status and EAR99 export classification. The KSC121JLFS is available in Cut Tape packaging, supporting automated assembly processes.

For new designs and production continuity, the KSC121JLFS is the appropriate selection. For legacy system maintenance where the original KSC121J specification must be preserved, the KSC121JLFS provides full functional compatibility with enhanced regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the KSC121JLFS be used as a direct replacement for the KSC121J?

A: Yes. The KSC121JLFS is electrically and mechanically identical to the KSC121J across all specified parameters, including circuit configuration, contact rating, mounting type, actuator dimensions, operating force, switch travel, ingress protection, temperature range, and mechanical life.

Q: What is the difference between the KSC121J and KSC121JLFS?

A: The primary differences are product status and compliance. The KSC121J is obsolete, while the KSC121JLFS is active. The KSC121JLFS is ROHS3 compliant, whereas the KSC121J is RoHS non-compliant. The KSC121JLFS is supplied in Cut Tape packaging.

Q: Are there any PCB layout or footprint changes required when switching from KSC121J to KSC121JLFS?

A: No. Both components share identical outline dimensions of 6.20mm x 6.20mm, identical actuator height of 2.50mm, and identical J Lead termination style. PCB footprints and layouts remain unchanged.

Q: Does the KSC121JLFS meet current regulatory requirements?

A: Yes. The KSC121JLFS is ROHS3 compliant and maintains REACH Unaffected status. The KSC121J is RoHS non-compliant and is not suitable for applications requiring current regulatory compliance.

Q: What packaging options are available for the KSC121JLFS?

A: The KSC121JLFS is supplied in Cut Tape (CT) packaging, suitable for automated pick-and-place assembly operations.