KSH421J 50 LFS Equivalent & Substitute Parts

Part Overview

The KSH421J 50 LFS is a tactile switch manufactured by C&K, featuring SPST-NO (Single Pole Single Throw - Normally Open) circuit configuration with a contact rating of 0.05A at 12VDC. This surface mount component is designed for off-momentary switch function applications with a square button actuator and top actuation orientation.

The KSH421J 50 LFS is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

KSH421J 50 LFS

C&KIn Stock: 874KSH421J 50 LFS Datasheet

Current PartRFQ

ADTSJW67NVTR

APEM Inc.In Stock: 1010ADTSJW67NVTR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KSH421J 50 LFS is determined by the following critical parameters:

• Circuit configuration (SPST-NO)
• Switch function (Off-Mom)
• Contact rating (0.05A @ 12VDC)
• Mounting type (Surface Mount)
• Actuator orientation (Top Actuated)
• Termination style (J Lead)
• Outline dimensions (6.30mm x 6.30mm nominal)
• Moisture sensitivity level (MSL 1)

The ADTSJW67NVTR from APEM Inc. satisfies these core substitution criteria. Both components share identical circuit configuration, switch function, contact rating, mounting type, and termination style. Outline dimensions are within acceptable tolerance (6.30mm x 6.20mm versus 6.30mm x 6.30mm). Both components maintain MSL 1 classification and are compliant with RoHS and REACH requirements.

Parameter Comparison

Engineering Selection Recommendations

The ADTSJW67NVTR is an active product from APEM Inc. and serves as a functional substitute for the obsolete KSH421J 50 LFS. Both components maintain identical electrical specifications (SPST-NO circuit, 0.05A @ 12VDC contact rating) and share compatible mechanical interfaces (surface mount, J lead termination, top actuated configuration).

The ADTSJW67NVTR carries ROHS3 compliance, representing current regulatory alignment. Both components are classified as MSL 1 and REACH Unaffected, ensuring compliance with moisture and chemical restriction requirements.

Differences in operating temperature range (-25°C ~ 70°C for ADTSJW67NVTR versus -40°C ~ 90°C for KSH421J 50 LFS), operating force (180gf versus 200gf), and switch travel (0.45mm versus 1.30mm) must be evaluated against specific application requirements. The ADTSJW67NVTR features a washable design characteristic not specified for the original component.

Frequently Asked Questions (FAQ)

Q: Can the ADTSJW67NVTR directly replace the KSH421J 50 LFS in existing designs?

A: The ADTSJW67NVTR shares the same circuit configuration (SPST-NO), contact rating (0.05A @ 12VDC), mounting type (surface mount), and termination style (J lead). Outline dimensions are within acceptable tolerance. However, differences in operating temperature range, operating force, and switch travel must be evaluated against application-specific requirements before implementation.

Q: What are the key differences between these two components?

A: The primary differences are: operating temperature range (ADTSJW67NVTR: -25°C ~ 70°C; KSH421J 50 LFS: -40°C ~ 90°C), operating force (ADTSJW67NVTR: 180gf; KSH421J 50 LFS: 200gf), switch travel (ADTSJW67NVTR: 0.45mm; KSH421J 50 LFS: 1.30mm), and actuator material (ADTSJW67NVTR: polyamide/nylon; KSH421J 50 LFS: rubber). The ADTSJW67NVTR is an active product while the KSH421J 50 LFS is obsolete.

Q: Are both components RoHS compliant?

A: Yes. The KSH421J 50 LFS is RoHS Compliant. The ADTSJW67NVTR is ROHS3 Compliant, representing current regulatory standards.

Q: What is the packaging format for these components?

A: Both the KSH421J 50 LFS and ADTSJW67NVTR are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes.

Q: Are there any moisture sensitivity considerations?

A: Both components are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.