KSA1A331LFT Equivalent & Substitute Parts

Part Overview

The KSA1A331LFT is a tactile switch manufactured by C&K, classified as SPST-NO (Single Pole Single Throw - Normally Open) with a contact rating of 0.01A at 32VDC. This through-hole mounted switch features top actuation, a 4.70mm actuator height, and is designed for applications requiring reliable momentary switching with dust-tight ingress protection (IP60). The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications.

Substiute Parts

KSA1A331LFT

C&KIn Stock: 842KSA1A331LFT Datasheet

Current PartRFQ

KSA1A331 LFTR

C&KIn Stock: 737KSA1A331 LFTR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KSA1A331LFT is determined by strict equivalence across the following critical parameters:

Circuit configuration must remain SPST-NO with Off-Mom switch function to maintain electrical compatibility. Contact rating of 0.01A @ 32VDC is non-negotiable for safe operation within the intended application envelope. Mounting type must be through-hole with PC pin termination to ensure PCB compatibility without redesign. Actuator orientation must be top-actuated with identical outline dimensions (7.40mm x 7.40mm) to fit existing mechanical enclosures and panel cutouts. Operating force (130gf) and switch travel (0.50mm) must match to preserve tactile feedback and user interface consistency. Operating temperature range (-40°C ~ 125°C), ingress protection (IP60), and compliance certifications (ROHS3, REACH Unaffected) must be maintained.

The substitute part KSA1A331 LFTR shares all these critical parameters with the main part, with the exception of actuator height off PCB, which differs (9.90mm vs. 4.70mm). This difference may impact mechanical clearance in space-constrained applications.

Parameter Comparison

Engineering Selection Recommendations

The KSA1A331 LFTR is an active product with current manufacturer support, whereas the KSA1A331LFT is discontinued. Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs and legacy system maintenance.

Selection between these parts depends on mechanical clearance requirements. The KSA1A331LFT with 4.70mm actuator height is suitable for applications with limited vertical space above the PCB. The KSA1A331 LFTR with 9.90mm actuator height provides extended reach and may be preferable for applications requiring greater tactile feedback distance or where the additional height does not conflict with enclosure constraints.

Both parts are electrically and functionally equivalent across all critical parameters. The choice should be driven by available inventory, mechanical fit within the target application, and long-term supply chain considerations favoring the active product status of the KSA1A331 LFTR.

Frequently Asked Questions (FAQ)

Q: Can KSA1A331 LFTR directly replace KSA1A331LFT without PCB redesign?

A: Electrical and functional replacement is direct. However, the 5.20mm difference in actuator height (9.90mm vs. 4.70mm) may require mechanical clearance verification. If the enclosure or panel cutout was designed for the lower profile of the KSA1A331LFT, the taller actuator of the KSA1A331 LFTR may not fit without modification.

Q: Are there any electrical performance differences between these parts?

A: No. Both parts share identical contact ratings (0.01A @ 32VDC), circuit configuration (SPST-NO), operating force (130gf), switch travel (0.50mm), and temperature range (-40°C ~ 125°C).

Q: What is the significance of the packaging difference (Bulk vs. -)?

A: The KSA1A331 LFTR is supplied in bulk packaging, while the KSA1A331LFT packaging designation is not specified. This affects order quantities and handling but does not impact electrical or mechanical compatibility.

Q: Why is the KSA1A331LFT discontinued?

A: Product discontinuation is a manufacturer decision typically driven by market demand, supply chain optimization, or product line consolidation. The active KSA1A331 LFTR serves as the current production equivalent.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both parts operate across -40°C ~ 125°C and maintain identical ingress protection (IP60 - Dust Tight) and moisture sensitivity ratings (MSL 1 - Unlimited).