KT11B1JM Equivalent & Substitute Parts

Part Overview

The KT11B1JM is a tactile switch manufactured by C&K, classified as SPST-NO (Single Pole Single Throw - Normally Open) with a contact rating of 1VA at 50V. This surface mount component features top actuation, sealed design with IP57 ingress protection, and is rated for 100,000 mechanical cycles. The KT11B1JM is currently listed as obsolete, making identification of equivalent substitute parts essential for ongoing design support and procurement.

Substiute Parts

KT11B1JM

C&KIn Stock: 999KT11B1JM Datasheet

Current PartRFQ

KT11B1JM34LFS

C&KIn Stock: 3334KT11B1JM34LFS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KT11B1JM is determined by the following critical parameters that must remain consistent:

• Circuit configuration (SPST-NO)
• Switch function (Off-Mom momentary operation)
• Mounting type (Surface Mount)
• Actuator orientation (Top Actuated)
• Physical dimensions (6.38mm x 6.22mm outline, 3.64mm actuator height)
• Termination style (J Lead)
• Ingress protection rating (IP57)
• Operating temperature range (-40°C ~ 90°C)
• Mechanical life rating (100,000 cycles)
• Actuator material (Rubber)
• Moisture sensitivity level (MSL 1)

The KT11B1JM34LFS qualifies as a direct substitute based on matching all critical mechanical and functional parameters. The primary difference is the contact rating voltage specification (32VAC/DC versus 50VAC/DC), which represents a downrating that is acceptable in applications where the lower voltage specification is sufficient. The substitute part is currently in active production status with improved RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The KT11B1JM34LFS is the qualified substitute for the obsolete KT11B1JM. Selection of this substitute is supported by the following factors:

The substitute part maintains identical mechanical compatibility, including surface mount footprint, actuator height, and physical outline dimensions. All functional parameters remain consistent: SPST-NO circuit configuration, momentary switch operation, sealed IP57 design, and 100,000-cycle mechanical life rating.

The KT11B1JM34LFS offers improved product lifecycle status as an active production part, ensuring long-term availability and supply chain stability. The substitute part achieves ROHS3 compliance, whereas the original KT11B1JM is RoHS non-compliant, providing regulatory advantage for new designs and manufacturing environments with RoHS requirements.

The contact rating voltage is specified at 32VAC/DC for the substitute versus 50VAC/DC for the original part. This represents a voltage downrating and is suitable for applications where the circuit operating voltage does not exceed 32V. Applications requiring the full 50V contact rating capability must evaluate alternative solutions outside this substitute relationship.

Both parts maintain identical operating temperature range (-40°C to 90°C), moisture sensitivity level (MSL 1), and REACH/ECCN compliance status.

Frequently Asked Questions (FAQ)

Q: Can the KT11B1JM34LFS be used as a direct replacement for the KT11B1JM in all applications?

A: The KT11B1JM34LFS is mechanically and functionally compatible with the KT11B1JM for surface mount applications requiring SPST-NO momentary switch operation. The primary consideration is the contact rating voltage: the substitute is rated for 32VAC/DC versus the original 50VAC/DC. Substitution is valid only when the circuit operating voltage does not exceed 32V.

Q: What are the key mechanical compatibility factors?

A: Both parts share identical physical dimensions (6.38mm x 6.22mm outline), actuator height (3.64mm), J Lead termination style, and top actuated orientation. PCB footprint and assembly process compatibility are maintained.

Q: How does the product status difference affect procurement?

A: The KT11B1JM is obsolete and no longer manufactured, creating supply chain risk. The KT11B1JM34LFS is in active production status, ensuring availability and long-term support. Transition to the active substitute part is recommended for new designs and ongoing production.

Q: What is the significance of the RoHS compliance difference?

A: The KT11B1JM is RoHS non-compliant, while the KT11B1JM34LFS achieves ROHS3 compliance. For manufacturing environments or markets with RoHS requirements, the substitute part provides regulatory compliance without design modification.

Q: Are the packaging options different between these parts?

A: The KT11B1JM packaging is listed as standard. The KT11B1JM34LFS is available in Cut Tape (CT) and Digi-Reel® packaging options, providing flexibility for different procurement and assembly workflows.

Q: What is the operating force specification for the substitute part?

A: The KT11B1JM34LFS specifies an operating force of 300gf. The original KT11B1JM does not provide an operating force specification in the available data.