KST241J Equivalent & Substitute Parts

Part Overview

The KST241J 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 with a 5.00mm actuator height and is designed for applications requiring momentary switching functionality. The KST241J is currently listed as obsolete, making identification of compatible substitute parts essential for ongoing production and maintenance applications.

Substiute Parts

KST241J

C&KIn Stock: 819KST241J Datasheet

Current PartRFQ

KST241JLFS

C&KIn Stock: 8765KST241JLFS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KST241J is determined by strict equivalence across the following critical parameters:

• Circuit configuration (SPST-NO)
• Contact rating (0.05A @ 32VDC)
• Mounting type (Surface Mount)
• Actuator height (5.00mm)
• Outline dimensions (6.20mm x 6.20mm)
• Operating force (350gf)
• Switch travel (1.30mm)
• Operating temperature range (-40°C ~ 85°C)
• Mechanical life (100,000 Cycles)
• Termination style (J Lead)

The KST241JLFS meets all these criteria and is classified as a direct substitute. The primary distinction between these parts is packaging format and product status, with the substitute offering active availability and improved compliance status.

Parameter Comparison

Engineering Selection Recommendations

The KST241JLFS is the direct functional equivalent to the obsolete KST241J. Both parts share identical electrical and mechanical specifications, ensuring pin-compatible and functionally equivalent operation in existing circuit designs.

Selection between these parts should be based on the following factors:

Product Availability: The KST241J is obsolete with limited remaining inventory (709 pcs). The KST241JLFS is active with significantly higher availability (8661 pcs), making it the preferred choice for new designs and ongoing production.

Regulatory Compliance: The KST241JLFS meets ROHS3 compliance requirements, whereas the KST241J is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, the KST241JLFS is the mandated selection.

Packaging Considerations: The KST241J is supplied in bulk packaging, while the KST241JLFS is supplied in Tape & Reel format. Tape & Reel packaging is standard for automated assembly processes and reduces handling and contamination risks.

Frequently Asked Questions (FAQ)

Q: Can KST241JLFS be used as a direct replacement for KST241J in existing designs?

A: Yes. The KST241JLFS is electrically and mechanically equivalent to the KST241J. All electrical parameters, mechanical dimensions, and performance characteristics are identical. Direct substitution is possible without circuit modification.

Q: What are the key differences between KST241J and KST241JLFS?

A: The primary differences are product status (obsolete vs. active), packaging format (bulk vs. Tape & Reel), and RoHS compliance status (non-compliant vs. ROHS3 compliant). Electrical and mechanical specifications are identical.

Q: Does the Tape & Reel packaging of KST241JLFS affect compatibility?

A: No. Tape & Reel packaging is a supply format only and does not affect component functionality or performance. The physical component remains identical. Tape & Reel format is standard for automated pick-and-place assembly.

Q: Are there any temperature or environmental limitations when substituting KST241JLFS for KST241J?

A: No. Both parts operate across the identical temperature range (-40°C ~ 85°C) and share the same ingress protection rating (IP40) and moisture sensitivity level (MSL 1). Environmental performance is equivalent.

Q: What is the impact of RoHS compliance differences?

A: The KST241JLFS meets ROHS3 compliance, while the KST241J does not. For applications or markets requiring RoHS compliance, the KST241JLFS is the required selection. For legacy systems without RoHS requirements, both parts are functionally equivalent.

Q: Is the mechanical life specification identical between both parts?

A: Yes. Both the KST241J and KST241JLFS are rated for 100,000 mechanical cycles with identical operating force (350gf) and switch travel (1.30mm).