KT11P4SM Equivalent & Substitute Parts

Part Overview

The KT11P4SM is a tactile switch manufactured by C&K, featuring SPST-NO (Single Pole Single Throw - Normally Open) circuit configuration with 1VA contact rating at 50V. This surface mount component is designed for applications requiring sealed, waterproof switching with IP57 ingress protection. The part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing production and maintenance applications.

Substiute Parts

KT11P4SM

C&KIn Stock: 1143KT11P4SM Datasheet

Current PartRFQ

KT11P4SM34LFS

C&KIn Stock: 4064KT11P4SM34LFS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KT11P4SM is determined by the following critical parameters that must remain consistent:

• Circuit Configuration: SPST-NO topology must be maintained
• Switch Function: Off-Mom (momentary) operation required
• Mounting Type: Surface mount with gull wing termination
• Physical Dimensions: Actuator height of 6.96mm and outline of 6.38mm x 6.22mm
• Actuator Orientation: Top actuated configuration
• Ingress Protection: IP57 sealed, waterproof rating
• Operating Temperature: -40°C ~ 90°C range
• Mechanical Life: 100,000 cycles minimum
• Actuator Material: Polyamide (PA), Nylon construction

The substitute part KT11P4SM34LFS shares the same base product number (KT11P4) and maintains all critical mechanical and functional parameters. The primary difference is the contact rating voltage specification (32V versus 50V), which represents a downrating of the electrical specification while preserving all other functional characteristics.

Parameter Comparison

Engineering Selection Recommendations

The KT11P4SM34LFS serves as a direct functional substitute for the obsolete KT11P4SM. Selection of this substitute is supported by the following engineering considerations:

Product Status: The KT11P4SM34LFS maintains active product status with C&K, ensuring continued availability and supply chain reliability compared to the obsolete KT11P4SM.

Regulatory Compliance: The KT11P4SM34LFS achieves ROHS3 compliance, whereas the original part is RoHS non-compliant. This upgrade in compliance status aligns with current regulatory requirements for electronic components in most markets.

Electrical Specification: The substitute part operates at a reduced voltage rating of 32V compared to the original 50V specification. This downrating is acceptable for applications operating at or below 32V. Applications requiring the full 50V rating cannot use this substitute.

Mechanical and Functional Equivalence: All mechanical parameters, including actuator height, dimensions, termination style, and ingress protection rating, remain identical between the two parts, ensuring direct PCB compatibility and functional interchangeability within voltage constraints.

Packaging Availability: The KT11P4SM34LFS is available in standard Tape & Reel packaging, facilitating automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can KT11P4SM34LFS be used as a direct replacement for KT11P4SM in all applications?

A: The KT11P4SM34LFS is mechanically and functionally equivalent to the KT11P4SM. However, the voltage rating is reduced from 50V to 32V. Substitution is valid only for applications operating at 32V or below. Applications requiring 50V operation cannot use this substitute.

Q: What are the key compatibility factors for substituting these parts?

A: The critical compatibility factors are: SPST-NO circuit configuration, momentary switch function, surface mount gull wing termination, 6.96mm actuator height, 6.38mm x 6.22mm outline dimensions, IP57 ingress protection, and -40°C to 90°C operating temperature range. Both parts meet these requirements.

Q: Does the packaging format affect electrical or mechanical performance?

A: No. The packaging format (Tape & Reel for the substitute) is a supply and handling consideration only. It does not affect the electrical characteristics or mechanical performance of the component itself.

Q: Why is the original KT11P4SM listed as obsolete?

A: The KT11P4SM is obsolete according to C&K's product status. The KT11P4SM34LFS represents the active product line continuation within the KT series, offering improved regulatory compliance while maintaining functional equivalence.

Q: Are there any environmental or compliance differences between these parts?

A: Yes. The KT11P4SM34LFS is ROHS3 compliant, whereas the KT11P4SM is RoHS non-compliant. Both parts are REACH unaffected and classified as EAR99 for export control purposes. The improved compliance status of the substitute makes it preferable for new designs and applications subject to RoHS regulations.

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

A: The KT11P4SM34LFS specifies an operating force of 300gf. This parameter was not provided for the original KT11P4SM in the available documentation.