PTS645TK43LFS Equivalent & Substitute Parts

Part Overview

The PTS645TK43LFS 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 switch features a 6.00mm x 6.00mm outline with a 4.30mm actuator height and is designed for off-momentary operation. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support and component sourcing.

Substiute Parts

PTS645TK43LFS

C&KIn Stock: 851PTS645TK43LFS 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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MJTP1232

APEM Inc.In Stock: 1075MJTP1232 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PTS645TK43LFS is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: Must be SPST-NO
• Contact Rating: Must be 0.05A @ 12VDC
• Switch Function: Must be Off-Mom
• Mounting Type: Must be Through Hole
• Termination Style: Must be PC Pin
• Mechanical Life: Must be 100,000 Cycles minimum
• RoHS Compliance: Must be ROHS3 Compliant

The substitute parts identified are all manufactured by APEM Inc. and maintain electrical equivalence with the original part. Mechanical variations exist in actuator height and outline dimensions, which must be evaluated against specific PCB layout and enclosure constraints in the target application.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain full electrical equivalence with the PTS645TK43LFS and are ROHS3 compliant with REACH unaffected status. The primary selection criteria are mechanical fit and operating environment compatibility.

For direct mechanical replacement with identical actuator height (4.30mm):

• MJTP1144: Outline 6.10mm x 6.10mm, operating force 160gf, temperature range -20°C ~ 70°C
• MJTP1232: Outline 6.00mm x 6.00mm, operating force 160gf, temperature range -20°C ~ 70°C

MJTP1232 provides the closest mechanical match with identical outline dimensions. MJTP1144 offers a minimal outline variance of 0.10mm per side.

For applications requiring extended temperature operation: The original PTS645TK43LFS operates to -40°C, while all APEM substitutes operate to -20°C minimum. Applications requiring operation below -20°C cannot use these substitutes.

For applications with PCB space constraints: MJTP1109, MJTP1109A, and MJTP1109B feature larger outline dimensions (7.20mm x 7.20mm) and are suitable only where PCB layout permits increased footprint. These variants offer selectable actuator heights of 5.00mm, 9.00mm, and 13.00mm respectively for varying enclosure clearance requirements.

All substitute parts are currently in active production status with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can MJTP1144 or MJTP1232 be used as direct drop-in replacements for PTS645TK43LFS?

A: Both parts maintain identical electrical specifications and actuator height of 4.30mm. MJTP1232 has identical outline dimensions (6.00mm x 6.00mm). MJTP1144 has a 0.10mm larger outline per side (6.10mm x 6.10mm). PCB footprint compatibility depends on design tolerances. Operating force differs: PTS645TK43LFS is 260gf while both APEM parts are 160gf, which may affect tactile feedback characteristics.

Q: Why do the APEM substitutes have a narrower operating temperature range?

A: The PTS645TK43LFS operates from -40°C to 85°C, while APEM substitutes operate from -20°C to 70°C. Applications requiring operation below -20°C or above 70°C cannot use these substitute parts. Design validation is required for applications operating at temperature extremes within the original specification.

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

A: These three parts are electrically and mechanically identical except for actuator height. MJTP1109 has 5.00mm height, MJTP1109A has 9.00mm height, and MJTP1109B has 13.00mm height. All share the same 7.20mm x 7.20mm outline and 200gf operating force. Selection depends on enclosure clearance requirements and desired actuator protrusion above the PCB.

Q: Are all substitute parts RoHS and REACH compliant?

A: All identified substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the original PTS645TK43LFS.

Q: What is the impact of different operating force values?

A: The original part requires 260gf activation force. MJTP1144 and MJTP1232 require 160gf, while MJTP1109 variants require 200gf. Lower activation force may result in unintended actuation in high-vibration environments. Higher activation force requires greater finger pressure for manual operation. Application-specific validation is required.

Q: Can I use MJTP1109 variants in applications with tight PCB space?

A: No. MJTP1109 variants have a 7.20mm x 7.20mm outline compared to the original 6.00mm x 6.00mm. These parts require additional PCB real estate and are suitable only where layout permits the larger footprint.