SWT4-J1WTR Equivalent & Substitute Parts

Part Overview

The SWT4-J1WTR is a tactile switch manufactured by TT Electronics/BI, configured as a SPST-NO (Single Pole Single Throw - Normally Open) momentary contact switch rated for 0.05A at 12VDC. This surface mount component features a flush top actuator with 0.55mm height and is designed for applications requiring low-force tactile feedback with 160gf operating force.

The SWT4-J1WTR carries an Obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production or repair requirements for systems utilizing this switch.

Substiute Parts

SWT4-J1WTR

TT Electronics/BIIn Stock: 905SWT4-J1WTR Datasheet

Current PartRFQ

KSC121JLFS

C&KIn Stock: 6411KSC121JLFS Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The KSC121JLFS from C&K qualifies as a functional substitute based on the following critical parameters:

Matching Electrical Characteristics:

• SPST-NO circuit configuration
• 0.05A contact rating (KSC121JLFS rated to 32VDC, exceeding the 12VDC requirement)
• Momentary contact switch function (Off-Mom)
• J Lead termination style

Matching Mechanical Characteristics:

• Surface mount mounting type
• Top actuated orientation
• Non-illuminated design
• Similar operating force (180gf vs. 160gf)

Substitution Basis: The KSC121JLFS maintains electrical compatibility through equivalent contact rating and circuit topology. The higher voltage rating (32VDC) provides margin above the original 12VDC specification. Physical compatibility is established through identical mounting type, actuator orientation, and termination style. The KSC121JLFS is Active product status with ROHS3 compliance, providing long-term availability and regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

Availability and Compliance: The KSC121JLFS is the recommended substitute due to Active product status and ROHS3 compliance. The original SWT4-J1WTR, classified as Obsolete, presents long-term supply chain risk. The substitute ensures regulatory alignment with current environmental standards.

Physical Integration Considerations: The KSC121JLFS presents dimensional differences that require PCB layout evaluation. The actuator height increases from 0.55mm to 2.50mm, and the footprint expands from 4.60mm to 6.20mm. These changes necessitate verification of mechanical clearance within the enclosure and PCB routing compatibility.

Electrical Performance: The substitute's 32VDC rating exceeds the original 12VDC specification, providing operational margin. The contact rating of 0.05A remains equivalent. Operating temperature range expansion (-40°C to 85°C versus -20°C to 70°C) supports broader environmental applications.

Mechanical Characteristics: The KSC121JLFS operating force of 180gf versus the original 160gf represents a 12.5% increase. Switch travel increases from 0.20mm to 0.30mm. These differences affect tactile feedback and actuation response characteristics. The substitute's mechanical life rating of 200,000 cycles is lower than the original 500,000 cycles.

Environmental Protection: The KSC121JLFS provides IP67 ingress protection, offering dust and moisture sealing not specified in the original part. This enhancement may benefit applications requiring environmental robustness.

Frequently Asked Questions (FAQ)

Q: Can the KSC121JLFS directly replace the SWT4-J1WTR without PCB modification?

A: Direct replacement without PCB modification is not possible. The KSC121JLFS has a larger footprint (6.20mm x 6.20mm versus 4.60mm x 4.60mm) and significantly greater actuator height (2.50mm versus 0.55mm). PCB layout redesign and mechanical clearance verification are required.

Q: What are the critical electrical compatibility factors?

A: Both parts share SPST-NO circuit configuration and 0.05A contact rating. The KSC121JLFS operates at 32VDC, which exceeds the original 12VDC requirement. Electrical compatibility is established through these matching parameters.

Q: How do the mechanical characteristics differ?

A: The KSC121JLFS requires 180gf operating force compared to 160gf for the original part. Switch travel increases from 0.20mm to 0.30mm. Mechanical life is rated at 200,000 cycles versus 500,000 cycles for the SWT4-J1WTR. These differences affect tactile response and long-term durability expectations.

Q: What packaging format is the substitute available in?

A: The KSC121JLFS is supplied in Cut Tape (CT) packaging, suitable for automated assembly processes.

Q: Does the substitute provide environmental protection advantages?

A: Yes. The KSC121JLFS carries IP67 ingress protection rating, providing dust-tight and waterproof sealing. The original SWT4-J1WTR does not specify ingress protection. This enhancement supports applications requiring environmental robustness.

Q: What is the product status difference between these parts?

A: The SWT4-J1WTR is Obsolete, indicating discontinued manufacturing and limited availability. The KSC121JLFS is Active, ensuring ongoing production and long-term supply chain stability.