MJTP1144A Tactile Switch SPST-NO Equivalent & Substitute Parts

Part Overview

The MJTP1144A is an active SPST-NO (Single Pole Single Throw - Normally Open) tactile switch manufactured by APEM Inc. This through-hole mounted component operates at 0.05A @ 12VDC with top actuation and tactile feedback. The switch features a 5.00mm actuator height, 6.10mm x 6.10mm outline, and 160gf operating force with 100,000 cycle mechanical life rating.

Substitute parts are necessary when the primary part experiences extended lead times, inventory constraints, or when design flexibility permits accommodation of alternative actuator heights or operating force specifications within the same electrical and mechanical classification.

Substiute Parts

MJTP1144A

APEM Inc.In Stock: 1137MJTP1144A Datasheet

Current PartRFQ

PTS645TK70-2 LFS

C&KIn Stock: 10524PTS645TK70-2 LFS Datasheet

SimilarRFQ

PTS645TL43-2 LFS

C&KIn Stock: 2739PTS645TL43-2 LFS Datasheet

SimilarRFQ

PTS645TL50-2 LFS

C&KIn Stock: 4519PTS645TL50-2 LFS Datasheet

SimilarRFQ

PTS645TL95-2 LFS

C&KIn Stock: 25661PTS645TL95-2 LFS Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MJTP1144A is determined by strict adherence to the following electrical and mechanical parameters:

Mandatory Matching Parameters:

• Circuit configuration: SPST-NO
• Switch function: Off-Mom (Momentary)
• Contact rating: 0.05A @ 12VDC
• Mounting type: Through Hole
• Actuator orientation: Top Actuated
• Termination style: PC Pin
• Mechanical life: 100,000 Cycles
• RoHS compliance: ROHS3 Compliant
• Moisture sensitivity level: 1 (Unlimited)

Variable Parameters (Permitted Variance):

• Actuator height off PCB (vertical): 4.30mm to 9.50mm
• Outline dimensions: 6.00mm x 6.00mm to 6.10mm x 6.10mm
• Operating force: 130gf to 260gf
• Operating temperature range: -40°C ~ 85°C (extended from -20°C ~ 70°C)
• Actuator material: Thermoplastic or Polyamide (PA66), Nylon 6/6

All substitute parts listed are manufactured by C&K (PTS645 series) and maintain electrical equivalence with the MJTP1144A while offering alternative physical configurations.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance equivalent to the MJTP1144A. Selection among substitute options depends on specific design requirements regarding actuator height and operating force:

PTS645TL50-2 LFS provides the closest physical and electrical match to the MJTP1144A, with identical 5.00mm actuator height and equivalent through-hole mounting configuration. This part is recommended for direct replacement applications where PCB layout and actuator accessibility are critical design constraints.

PTS645TL43-2 LFS offers the lowest actuator height at 4.30mm with reduced operating force of 130gf, suitable for applications with limited vertical clearance or requiring lighter actuation force.

PTS645TL95-2 LFS provides maximum actuator height at 9.50mm with 130gf operating force, appropriate for applications requiring extended reach or enhanced tactile feedback accessibility.

PTS645TK70-2 LFS features the highest operating force at 260gf with 7.00mm actuator height, suitable for applications requiring increased actuation resistance or where accidental activation must be minimized.

All substitute parts are available in bulk packaging with inventory levels ranging from 2,698 to 25,602 units. Extended operating temperature range (-40°C ~ 85°C) on all C&K alternatives provides enhanced thermal performance compared to the MJTP1144A specification.

Frequently Asked Questions (FAQ)

Q: Can PTS645 series switches directly replace the MJTP1144A without PCB modification?

A: Electrical substitution is direct due to identical SPST-NO circuit configuration, 0.05A @ 12VDC contact rating, and PC Pin termination. Physical compatibility depends on actuator height variance. PTS645TL50-2 LFS matches the 5.00mm height exactly. Other variants require verification of available vertical clearance and actuator accessibility on the target PCB.

Q: What is the significance of the different operating force values among substitute parts?

A: Operating force (measured in grams-force) determines the tactile feedback and actuation pressure required. The MJTP1144A specifies 160gf. PTS645TL43-2 LFS, PTS645TL50-2 LFS, and PTS645TL95-2 LFS operate at 130gf (lighter actuation), while PTS645TK70-2 LFS requires 260gf (heavier actuation). Selection should align with user interface ergonomics and application requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The MJTP1144A and all four PTS645 series substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), ensuring equivalent environmental and regulatory compliance.

Q: What is the impact of outline dimension differences (6.10mm vs. 6.00mm)?

A: The MJTP1144A has a 6.10mm x 6.10mm outline, while all PTS645 substitutes measure 6.00mm x 6.00mm. This 0.10mm reduction per side is negligible for most PCB layouts. Verify footprint spacing and adjacent component clearance on the target board to confirm compatibility.

Q: Can the extended operating temperature range of PTS645 parts (-40°C ~ 85°C) be used in applications specified for -20°C ~ 70°C?

A: Yes. The PTS645 series extended temperature specification encompasses the MJTP1144A operating range and provides additional thermal margin. This represents an enhancement for applications subject to wider environmental temperature variation.

Q: What is the grounding pin feature on PTS645 parts?

A: The grounding pin is a mechanical feature present on C&K PTS645 series switches. This does not affect electrical equivalence for SPST-NO circuit applications but may require PCB footprint accommodation if not present in the original MJTP1144A design.