KT11P3SM Equivalent & Substitute Parts

Part Overview

The KT11P3SM 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, gull wing termination, and sealed construction with IP57 ingress protection. The part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and procurement planning.

Substiute Parts

KT11P3SM

C&KIn Stock: 1080KT11P3SM Datasheet

Current PartRFQ

KT11P3SM34LFS

C&KIn Stock: 7084KT11P3SM34LFS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KT11P3SM is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: Must remain SPST-NO
• Switch Function: Must remain Off-Mom (Momentary)
• Mounting Type: Must remain Surface Mount
• Actuator Orientation: Must remain Top Actuated
• Termination Style: Must remain Gull Wing
• Outline Dimensions: Must match 6.38mm x 6.22mm
• Actuator Height: Must match 4.12mm
• Ingress Protection: Must maintain IP57 rating
• Operating Temperature Range: Must maintain -40°C ~ 90°C
• Mechanical Life: Must maintain 100,000 Cycles minimum
• Actuator Material: Must remain Polyamide (PA), Nylon

The substitute part KT11P3SM34LFS belongs to the same KT series and maintains mechanical and environmental compatibility. The primary difference is the contact rating voltage specification (32VAC/DC versus 50VAC/DC), which represents a downrating of the electrical specification while preserving all mechanical and environmental characteristics.

Parameter Comparison

Engineering Selection Recommendations

The KT11P3SM34LFS serves as the active production equivalent for the obsolete KT11P3SM. Selection between these parts should be based on the following criteria:

For KT11P3SM (Obsolete): Retain only for existing inventory management or legacy system support where the 50VAC/DC contact rating is specifically required and cannot be downrated.

For KT11P3SM34LFS (Active): This is the recommended selection for new designs and procurement. The part maintains full mechanical and environmental compatibility while offering:

• Active product status with ongoing manufacturer support
• ROHS3 compliance versus non-compliant status of the main part
• Higher inventory availability (6980 Pcs versus 1069 Pcs)
• Tape & Reel packaging suitable for automated assembly

The electrical downrating from 50VAC/DC to 32VAC/DC must be evaluated against circuit requirements. If the application operates at voltages exceeding 32VAC/DC, the substitute is not suitable.

Frequently Asked Questions (FAQ)

Q: Can KT11P3SM34LFS be used as a direct replacement for KT11P3SM?

A: Yes, provided the circuit voltage does not exceed 32VAC/DC. All mechanical, environmental, and functional parameters are equivalent. The contact rating voltage is the only specification difference.

Q: What is the significance of the voltage downrating from 50V to 32V?

A: The contact rating defines the maximum voltage and current the switch contacts can safely handle. A 32VAC/DC rating is suitable for applications operating at or below this voltage. If your circuit requires 50VAC/DC operation, the substitute is not compatible.

Q: Why is KT11P3SM listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The KT11P3SM34LFS represents the active production alternative within the same KT series.

Q: Are there packaging differences between these parts?

A: Yes. The KT11P3SM packaging is listed as unspecified (-), while KT11P3SM34LFS is supplied in Tape & Reel (TR) format, which is standard for automated surface mount assembly.

Q: What is the difference in RoHS compliance?

A: KT11P3SM is RoHS non-compliant, while KT11P3SM34LFS is ROHS3 compliant. For applications subject to RoHS regulations, the substitute is the appropriate choice.

Q: Are the mechanical dimensions identical?

A: Yes. Both parts share identical outline dimensions (6.38mm x 6.22mm), actuator height (4.12mm), and all other mechanical specifications, ensuring PCB layout compatibility.

Q: What is the operating force of KT11P3SM34LFS?

A: The operating force is specified as 300gf for the substitute part. This parameter was not provided for the main part.