PTS645TM50LFS Equivalent & Substitute Parts

Part Overview

The PTS645TM50LFS 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 component features top actuation, through-hole mounting, and a 6.00mm x 6.00mm outline with a 5.00mm actuator height. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

PTS645TM50LFS

C&KIn Stock: 1177PTS645TM50LFS 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

Substitute parts for the PTS645TM50LFS are qualified based on the following critical parameters that must align with the original component:

Mandatory Matching Parameters:

• Circuit configuration: SPST-NO
• Contact rating: 0.05A @ 12VDC
• Switch function: Off-Mom (Momentary)
• Mounting type: Through Hole
• Termination style: PC Pin
• Actuator orientation: Top Actuated

Allowable Variation Parameters:

• Actuator height off PCB: ±1.00mm tolerance acceptable for mechanical fit
• Outline dimensions: ±0.20mm tolerance acceptable for PCB footprint compatibility
• Operating force: ±40gf tolerance acceptable for user interface consistency
• Operating temperature range: Substitute range must encompass or equal the original range
• Actuator material: Thermoplastic acceptable as equivalent to Polyamide (PA66)

The substitute parts listed below meet these criteria and are sourced from APEM Inc., maintaining electrical equivalence and mechanical compatibility with the original PTS645TM50LFS design.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Closest Mechanical Fit):

MJTP1232A and MJTP1144 are the preferred substitutes for the PTS645TM50LFS. MJTP1232A maintains identical outline dimensions (6.00mm x 6.00mm) and actuator height (5.00mm), with matching operating force (160gf). MJTP1144 provides similar mechanical characteristics with a 4.30mm actuator height and 6.10mm x 6.10mm outline, representing minimal deviation from the original footprint.

Both parts are manufactured by APEM Inc., carry Active product status, and maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring long-term availability and regulatory alignment.

Secondary Substitutes (Acceptable with Design Review):

MJTP1109, MJTP1109A, and MJTP1109B are electrically equivalent but feature larger outline dimensions (7.20mm x 7.20mm) and variable actuator heights (5.00mm, 9.00mm, and 13.00mm respectively). These parts are suitable for applications where PCB layout permits increased footprint or where specific actuator height requirements differ from the original design. Operating force increases to 200gf in these variants.

Temperature Range Consideration:

All substitute parts operate within -20°C to 70°C, which is narrower than the original PTS645TM50LFS range of -40°C to 85°C. Applications requiring operation below -20°C or above 70°C must conduct thermal validation before substitution.

Frequently Asked Questions (FAQ)

Q: Can MJTP1232A directly replace PTS645TM50LFS without PCB modification?

A: Yes. MJTP1232A matches the critical parameters: identical outline (6.00mm x 6.00mm), actuator height (5.00mm), operating force (160gf), and electrical specifications (SPST-NO, 0.05A @ 12VDC). No PCB footprint changes are required.

Q: What is the difference between MJTP1109, MJTP1109A, and MJTP1109B?

A: These parts are electrically identical but differ in actuator height. MJTP1109 provides 5.00mm height (matching the original), MJTP1109A provides 9.00mm, and MJTP1109B provides 13.00mm. Selection depends on mechanical clearance and user interface requirements. All three feature increased operating force (200gf) compared to the original (160gf).

Q: Why do substitute parts have a narrower operating temperature range?

A: The original PTS645TM50LFS operates from -40°C to 85°C, while APEM substitutes operate from -20°C to 70°C. Applications requiring the full original temperature range must validate substitute performance or source alternative components with extended temperature specifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (MJTP1144, MJTP1109A, MJTP1109, MJTP1232A, MJTP1109B) are ROHS3 compliant with MSL 1 (Unlimited), matching the regulatory status of the original PTS645TM50LFS.

Q: What is the impact of increased operating force in MJTP1109 variants?

A: MJTP1109, MJTP1109A, and MJTP1109B require 200gf operating force compared to 160gf in the original and MJTP1232A/MJTP1144. This 40gf increase may affect user interface feel and should be evaluated in applications where tactile feedback consistency is critical.

Q: Can MJTP1144 be used if PCB space is limited?

A: MJTP1144 has a slightly larger outline (6.10mm x 6.10mm) compared to the original (6.00mm x 6.00mm), representing a 0.10mm increase per side. This minimal difference is typically acceptable within standard PCB design tolerances but should be verified against specific layout constraints.