PTS645TK50LFS Equivalent & Substitute Parts

Part Overview

The PTS645TK50LFS is a tactile switch manufactured by C&K, classified as SPST-NO (Single Pole Single Throw - Normally Open) with a contact rating of 0.05A at 12VDC. This through-hole mounted component features a 6.00mm x 6.00mm outline with a 5.00mm actuator height and grounding pin functionality. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support and component sourcing.

Substiute Parts

PTS645TK50LFS

C&KIn Stock: 760PTS645TK50LFS Datasheet

Current PartRFQ

MJTP1109

APEM Inc.In Stock: 1027MJTP1109 Datasheet

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MJTP1109A

APEM Inc.In Stock: 876MJTP1109A Datasheet

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MJTP1109B

APEM Inc.In Stock: 943MJTP1109B Datasheet

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MJTP1144

APEM Inc.In Stock: 866MJTP1144 Datasheet

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MJTP1232A

APEM Inc.In Stock: 825MJTP1232A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PTS645TK50LFS is determined by the following critical parameters:

Primary Matching Criteria:

• Circuit configuration: SPST-NO
• Contact rating: 0.05A @ 12VDC
• Mounting type: Through Hole
• Termination style: PC Pin
• Actuator orientation: Top Actuated

Secondary Compatibility Factors:

• Outline dimensions (6.00mm x 6.00mm preferred for PCB layout compatibility)
• Actuator height (5.00mm nominal for mechanical clearance)
• Operating force range (160gf to 260gf acceptable within application tolerance)
• Mechanical life: 100,000 Cycles minimum
• RoHS3 compliance and MSL Level 1

The substitute parts listed below meet the primary matching criteria. Variations in outline dimensions, actuator height, and operating force represent design trade-offs that may require PCB layout or mechanical assembly verification.

Parameter Comparison

Engineering Selection Recommendations

Best-Match Substitutes (Minimal Design Changes):

MJTP1232A and MJTP1109 are the closest functional equivalents to the PTS645TK50LFS. Both maintain the 6.00mm x 6.00mm outline (MJTP1232A) or 5.00mm actuator height (MJTP1109), minimizing PCB layout modifications. Both are active products with ROHS3 compliance and 100,000-cycle mechanical life ratings.

Consideration for Temperature Range:

The PTS645TK50LFS operates across -40°C to 85°C, while all APEM Inc. substitutes operate within -20°C to 70°C. Applications requiring the extended lower temperature range (-40°C) must evaluate whether the narrower operating window is acceptable for the intended use case.

Consideration for Operating Force:

The PTS645TK50LFS specifies 260gf operating force, while MJTP1144 and MJTP1232A specify 160gf, and MJTP1109, MJTP1109A, and MJTP1109B specify 200gf. Lower operating force values may affect tactile feedback characteristics and user perception of switch actuation.

Consideration for Outline and Height Variations:

MJTP1144 (6.10mm x 6.10mm, 4.30mm height) and MJTP1109A (7.20mm x 7.20mm, 9.00mm height) and MJTP1109B (7.20mm x 7.20mm, 13.00mm height) introduce dimensional variations requiring mechanical clearance verification on the target PCB assembly.

All substitute parts are active products from APEM Inc., ensuring long-term availability and supply chain stability compared to the obsolete PTS645TK50LFS.

Frequently Asked Questions (FAQ)

Q: Can MJTP1109 directly replace PTS645TK50LFS without PCB modifications?

A: MJTP1109 maintains the same 5.00mm actuator height and SPST-NO circuit configuration as the PTS645TK50LFS. However, the outline dimension increases from 6.00mm x 6.00mm to 7.20mm x 7.20mm, requiring verification of available PCB footprint space. The operating force decreases from 260gf to 200gf, which may affect tactile feedback.

Q: What is the impact of the 160gf operating force in MJTP1144 and MJTP1232A?

A: Operating force directly affects the tactile feedback and actuation effort experienced by the user. The reduction from 260gf to 160gf results in a lighter, more responsive switch. Applications sensitive to actuation force characteristics must evaluate whether this change is acceptable for the intended user interface.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (MJTP1144, MJTP1109, MJTP1109A, MJTP1109B, MJTP1232A) are ROHS3 compliant with MSL Level 1 (Unlimited moisture sensitivity), matching the compliance profile of the PTS645TK50LFS.

Q: Which substitute offers the closest dimensional match?

A: MJTP1232A provides the closest dimensional match with identical 6.00mm x 6.00mm outline and 5.00mm actuator height. This minimizes PCB layout modifications and mechanical assembly changes.

Q: How does the operating temperature range affect substitution?

A: The PTS645TK50LFS operates from -40°C to 85°C, while all APEM Inc. substitutes operate from -20°C to 70°C. Applications requiring operation below -20°C or above 70°C cannot use these substitutes without additional thermal management or alternative component selection.

Q: What is the mechanical life expectancy of the substitute parts?

A: All substitute parts maintain the 100,000-cycle mechanical life rating of the PTS645TK50LFS, ensuring equivalent durability for standard industrial and consumer applications.