KSH411J 50 LFS Equivalent & Substitute Parts

Part Overview

The KSH411J 50 LFS is a tactile switch manufactured by C&K, configured as SPST-NO (Single Pole Single Throw - Normally Open) with a contact rating of 0.05A at 12VDC. This surface mount component features a square button actuator with 5.00mm height and is designed for off-momentary switch function applications. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing design support and component procurement.

Substiute Parts

KSH411J 50 LFS

C&KIn Stock: 1054KSH411J 50 LFS Datasheet

Current PartRFQ

KSC421J 70SH LFS

C&KIn Stock: 48186KSC421J 70SH LFS Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KSH411J 50 LFS is determined by the following critical parameters:

Electrical Compatibility: Circuit configuration (SPST-NO), switch function (Off-Mom), and contact rating must support the application voltage and current requirements. The KSH411J operates at 0.05A @ 12VDC; substitute parts must maintain or exceed this electrical specification.

Mechanical Compatibility: Mounting type (Surface Mount), actuator orientation (Top Actuated), termination style (J Lead), and outline dimensions (6.30mm x 6.30mm) establish the physical footprint and PCB interface. Actuator height (5.00mm) and switch travel (1.30mm) define the mechanical envelope.

Environmental & Regulatory Compliance: Operating temperature range (-40°C ~ 90°C), ingress protection (IP40), RoHS compliance, and MSL rating (1) establish the reliability and regulatory framework for substitution.

The KSC421J 70SH LFS qualifies as a substitute based on matching circuit configuration (SPST-NO), switch function (Off-Mom), mounting type (Surface Mount), actuator orientation (Top Actuated), termination style (J Lead), and regulatory compliance (RoHS3, MSL 1). The substitute provides enhanced electrical rating (0.05A @ 32VDC), improved ingress protection (IP67), and extended mechanical life (300,000 cycles).

Parameter Comparison

Engineering Selection Recommendations

The KSC421J 70SH LFS is a direct substitute for the obsolete KSH411J 50 LFS. Both components share identical circuit configuration, switch function, mounting type, actuator orientation, and termination style, establishing functional and mechanical compatibility.

The KSC421J 70SH LFS provides superior electrical performance with a contact rating of 0.05A @ 32VDC compared to the original 0.05A @ 12VDC specification, supporting higher voltage applications without derating. Enhanced ingress protection (IP67 versus IP40) provides superior environmental sealing for dust and moisture exposure. Extended mechanical life (300,000 cycles versus 200,000 cycles) improves component longevity in high-cycle applications.

The substitute maintains full regulatory compliance with RoHS3 certification and MSL 1 rating, ensuring compatibility with modern manufacturing and environmental standards. Active product status ensures ongoing availability and supply chain continuity.

Minor dimensional variations exist: outline dimensions decrease from 6.30mm x 6.30mm to 6.20mm x 6.20mm, while actuator height increases from 5.00mm to 5.20mm. Switch travel reduces from 1.30mm to 0.50mm, and operating force increases from 160gf to 170gf. These variations remain within typical PCB layout tolerances for surface mount tactile switches and do not preclude direct substitution in standard applications.

Frequently Asked Questions (FAQ)

Q: Can the KSC421J 70SH LFS directly replace the KSH411J 50 LFS on existing PCBs?

A: Yes. Both components use identical mounting type (Surface Mount), J Lead termination, and top actuated orientation. Outline dimensions are comparable (6.30mm x 6.30mm versus 6.20mm x 6.20mm), and actuator height variation (5.00mm versus 5.20mm) falls within standard PCB clearance tolerances for tactile switch applications.

Q: What is the voltage rating difference between these parts?

A: The KSH411J 50 LFS is rated 0.05A @ 12VDC, while the KSC421J 70SH LFS is rated 0.05A @ 32VDC. The substitute supports higher voltage applications. For circuits designed for 12VDC operation, the substitute operates with additional voltage margin and improved reliability.

Q: How do the mechanical specifications differ?

A: The KSC421J 70SH LFS features reduced switch travel (0.50mm versus 1.30mm), increased operating force (170gf versus 160gf), and extended mechanical life (300,000 cycles versus 200,000 cycles). These characteristics result in a more responsive switch with improved durability for high-cycle applications.

Q: What is the significance of the IP67 ingress protection rating on the substitute?

A: The KSC421J 70SH LFS provides IP67 protection (dust tight, waterproof) compared to IP40 on the original part. This enhanced sealing protects against moisture and particulate ingress, making the substitute suitable for applications requiring environmental resistance beyond the original specification.

Q: Are there packaging differences between these parts?

A: The KSH411J 50 LFS is supplied in standard packaging, while the KSC421J 70SH LFS is supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for high-volume surface mount assembly and does not affect component functionality or PCB compatibility.

Q: Why is the original part obsolete?

A: The KSH411J 50 LFS is classified as obsolete, indicating discontinued manufacturing. The KSC421J 70SH LFS, with active product status, represents the current C&K offering for equivalent SPST-NO tactile switch applications and ensures long-term supply chain availability.