KSC321J Equivalent & Substitute Parts

Part Overview

The KSC321J 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 KSC321J is currently listed as obsolete, making identification of compatible substitute parts essential for ongoing production and maintenance applications.

Substiute Parts

KSC321J

C&KIn Stock: 1084KSC321J Datasheet

Current PartRFQ

KSC321JLFS

C&KIn Stock: 1674KSC321JLFS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KSC321J is determined by strict equivalence across electrical and mechanical parameters. The primary substitute, KSC321JLFS, maintains identical specifications for circuit configuration (SPST-NO), contact rating (0.05A @ 32VDC), actuator height (4.60mm), outline dimensions (6.20mm x 6.20mm), operating force (200gf), ingress protection (IP67), operating temperature range (-40°C ~ 85°C), switch travel (0.20mm), and mechanical life (300,000 cycles). Both parts share the same base product number (KSC321) and termination style (J Lead), confirming functional and mechanical compatibility. The key differentiator is packaging format and product status: KSC321JLFS is supplied in Tape & Reel format with active product status and RoHS3 compliance, whereas the original KSC321J is obsolete and RoHS non-compliant.

Parameter Comparison

Engineering Selection Recommendations

The KSC321JLFS is the direct functional equivalent of the obsolete KSC321J. Selection of KSC321JLFS is recommended for new designs and production continuity due to its active product status and RoHS3 compliance. Both parts are electrically and mechanically identical across all critical parameters, ensuring drop-in compatibility at the circuit level. The KSC321JLFS is supplied in Tape & Reel packaging, which is standard for automated assembly processes. For applications requiring compliance with current environmental regulations, KSC321JLFS satisfies RoHS3 requirements, whereas KSC321J does not. Both parts maintain REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can KSC321JLFS be used as a direct replacement for KSC321J in existing designs?

A: Yes. KSC321JLFS is electrically and mechanically equivalent to KSC321J. All critical parameters—circuit configuration, contact rating, actuator dimensions, operating force, ingress protection, temperature range, and mechanical life—are identical. PCB layout and schematic integration require no modification.

Q: What is the primary difference between KSC321J and KSC321JLFS?

A: The primary differences are product status, packaging format, and regulatory compliance. KSC321J is obsolete and supplied in bulk packaging with RoHS non-compliant status. KSC321JLFS is active, supplied in Tape & Reel format, and RoHS3 compliant.

Q: Is the Tape & Reel packaging of KSC321JLFS compatible with standard pick-and-place assembly equipment?

A: Yes. Tape & Reel packaging is the industry standard for automated surface mount assembly. KSC321JLFS in Tape & Reel format is compatible with standard SMT equipment and feeders.

Q: Are there any electrical performance differences between KSC321J and KSC321JLFS?

A: No. Both parts have identical electrical specifications: SPST-NO circuit, 0.05A @ 32VDC contact rating, Off-Mom switch function, and 300,000 cycle mechanical life.

Q: Does KSC321JLFS meet current environmental compliance requirements?

A: Yes. KSC321JLFS is RoHS3 compliant and REACH Unaffected, meeting current environmental regulations. KSC321J is RoHS non-compliant and should not be used in applications requiring regulatory compliance.