KT11P3SA2M33 Equivalent & Substitute Parts

Part Overview

The KT11P3SA2M33 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 component features side actuation, surface mount right-angle mounting, 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

KT11P3SA2M33

C&KIn Stock: 1079KT11P3SA2M33 Datasheet

Current PartRFQ

KT11P3SA2M35LFG

C&KIn Stock: 1387KT11P3SA2M35LFG Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KT11P3SA2M33 is determined by the following critical parameters:

• Circuit Configuration: Must be SPST-NO
• Switch Function: Must be Off-Mom (Momentary)
• Mounting Type: Must be Surface Mount, Right Angle
• Actuator Orientation: Must be Side Actuated
• Termination Style: Must be Gull Wing
• Outline Dimensions: Must be 7.77mm x 6.41mm
• Operating Force: Must be 300gf
• Ingress Protection: Must be IP57
• Operating Temperature Range: Must be -40°C ~ 90°C
• Mechanical Life: Must be 100,000 Cycles

The substitute part KT11P3SA2M35LFG meets all mechanical and functional requirements. The primary difference is the contact rating voltage specification (32VAC/DC versus 50VAC/DC) and product status (Active versus Obsolete). The lower voltage rating of the substitute part represents a constraint for applications requiring the full 50V specification.

Parameter Comparison

Engineering Selection Recommendations

The KT11P3SA2M35LFG is the designated substitute for the obsolete KT11P3SA2M33. Selection of this substitute is supported by the following factors:

• Product Status: The substitute part maintains Active status, ensuring continued availability and manufacturing support from C&K.
• Compliance: The KT11P3SA2M35LFG achieves ROHS3 compliance, whereas the original part is RoHS non-compliant. This addresses regulatory requirements for new designs and procurement cycles.
• Mechanical Compatibility: All mechanical parameters, including mounting type, actuator orientation, dimensions, operating force, and ingress protection, are identical between the two parts.
• Functional Equivalence: Both parts share identical circuit configuration (SPST-NO), switch function (Off-Mom), and mechanical life specifications (100,000 cycles).

The primary design consideration is the voltage rating differential. Applications operating at voltages exceeding 32VAC/DC require evaluation of circuit topology and load characteristics to determine compatibility with the substitute part's lower voltage specification.

Frequently Asked Questions (FAQ)

Q: Can KT11P3SA2M35LFG be used as a direct replacement for KT11P3SA2M33?

A: The KT11P3SA2M35LFG is mechanically and functionally equivalent to the KT11P3SA2M33 across all parameters except voltage rating. Direct substitution is valid for applications operating at 32VAC/DC or below. Applications requiring the full 50VAC/DC specification of the original part require circuit evaluation.

Q: What is the primary difference between these two parts?

A: The contact rating voltage specification differs: KT11P3SA2M33 is rated at 1VA @ 50VAC/DC, while KT11P3SA2M35LFG is rated at 1VA @ 32VAC/DC. Additionally, the substitute part is Active status with ROHS3 compliance, whereas the original is Obsolete and RoHS non-compliant.

Q: Are the physical dimensions identical?

A: Yes. Both parts share identical outline dimensions of 7.77mm x 6.41mm, identical mounting configuration (Surface Mount, Right Angle), and identical actuator specifications (Side Actuated, 300gf operating force).

Q: What packaging options are available for the substitute part?

A: The KT11P3SA2M35LFG is supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes.

Q: Are there any compliance differences between the two parts?

A: Yes. The KT11P3SA2M33 is RoHS non-compliant, while the KT11P3SA2M35LFG achieves ROHS3 compliance. Both parts maintain REACH Unaffected status and EAR99 ECCN classification.

Q: What is the mechanical life expectancy for both parts?

A: Both the KT11P3SA2M33 and KT11P3SA2M35LFG are rated for 100,000 mechanical cycles, providing equivalent durability for momentary switch applications.