KSL1M331LFT Equivalent & Substitute Parts

Part Overview

The KSL1M331LFT 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 component features top actuation, a 9.90mm 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 identification of equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

KSL1M331LFT

C&KIn Stock: 1141KSL1M331LFT Datasheet

Current PartRFQ

KSL1M331 LFTR

C&KIn Stock: 1191KSL1M331 LFTR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KSL1M331LFT is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: SPST-NO topology must be maintained
• Contact Rating: 0.01A @ 32VDC electrical specification
• Switch Function: Off-Mom (momentary) operation
• Mounting Type: Through Hole configuration
• Actuator Orientation: Top Actuated design
• Outline Dimensions: 7.40mm x 7.40mm footprint
• Operating Force: 130gf actuation force
• Switch Travel: 0.50mm displacement
• Mechanical Life: 1,000,000 cycles minimum
• Operating Temperature: -40°C ~ 125°C range
• Ingress Protection: IP60 dust-tight rating
• Compliance: ROHS3 and REACH requirements

The KSL1M331 LFTR qualifies as a direct substitute based on identical electrical specifications, mechanical characteristics, and compliance certifications. The primary distinction is the actuator height specification, which differs between the two variants while maintaining all other functional and dimensional requirements.

Parameter Comparison

Engineering Selection Recommendations

The KSL1M331 LFTR is the qualified substitute for the discontinued KSL1M331LFT. Both components maintain identical electrical specifications (0.01A @ 32VDC SPST-NO configuration), mechanical characteristics (130gf operating force, 0.50mm travel, 1,000,000 cycle life), and compliance certifications (ROHS3, REACH Unaffected, MSL 1).

The KSL1M331 LFTR is currently in active production status, ensuring long-term availability and supply chain continuity. The primary design consideration is the actuator height differential: the substitute features a 4.70mm actuator height compared to the original 9.90mm specification. This dimensional change requires PCB layout and mechanical enclosure verification to confirm clearance compatibility with the target application.

Both components share identical outline dimensions (7.40mm x 7.40mm), termination style (PC Pin), and ingress protection rating (IP60). The substitute is available in bulk packaging, whereas the original was supplied in tape and reel format.

Frequently Asked Questions (FAQ)

Q: Can the KSL1M331 LFTR be used as a direct replacement for the KSL1M331LFT?

A: The KSL1M331 LFTR qualifies as a functional substitute based on identical electrical specifications, circuit configuration, and mechanical life ratings. The critical design consideration is the actuator height difference (4.70mm vs. 9.90mm), which must be evaluated against PCB layout and enclosure constraints.

Q: What is the primary difference between these two parts?

A: The actuator height specification differs between the variants. The KSL1M331LFT features a 9.90mm actuator height, while the KSL1M331 LFTR has a 4.70mm actuator height. All other electrical, mechanical, and compliance parameters are identical.

Q: Are the electrical specifications identical?

A: Yes. Both parts are SPST-NO momentary switches with 0.01A @ 32VDC contact ratings, 130gf operating force, 0.50mm switch travel, and 1,000,000 cycle mechanical life.

Q: What compliance certifications apply to the substitute?

A: The KSL1M331 LFTR is ROHS3 compliant, REACH unaffected, and carries MSL 1 (unlimited moisture sensitivity level) classification, matching the original part specifications.

Q: Does packaging format affect electrical or mechanical performance?

A: No. The substitute is supplied in bulk packaging rather than tape and reel format. Packaging format does not affect component performance, only procurement and handling procedures.

Q: What is the operating temperature range for both parts?

A: Both the KSL1M331LFT and KSL1M331 LFTR operate across -40°C to 125°C, maintaining full electrical and mechanical specifications throughout this range.