PTS645TH43 LFS Equivalent & Substitute Parts

Part Overview

The PTS645TH43 LFS 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 top actuation with a 4.30mm actuator height and is designed for applications requiring momentary switching functionality. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support and component sourcing.

Substiute Parts

PTS645TH43 LFS

C&KIn Stock: 883PTS645TH43 LFS Datasheet

Current PartRFQ

MJTP1144

APEM Inc.In Stock: 866MJTP1144 Datasheet

SimilarRFQ

MJTP1144A

APEM Inc.In Stock: 1137MJTP1144A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PTS645TH43 LFS are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Circuit configuration: SPST-NO
• Contact rating: 0.05A @ 12VDC
• Switch function: Off-Mom (Momentary)
• Mounting type: Through Hole
• Actuator orientation: Top Actuated
• Termination style: PC Pin
• Mechanical life: 100,000 Cycles minimum
• RoHS3 compliance

Allowable Variations:

• Actuator height: ±0.70mm tolerance
• Outline dimensions: ±0.10mm tolerance
• Operating force: ±40gf tolerance
• Operating temperature range: May be narrower than original
• Actuator material: Alternative thermoplastic materials acceptable

The substitute parts MJTP1144 and MJTP1144A from APEM Inc. meet all critical electrical parameters and mechanical life requirements. Both parts maintain SPST-NO circuit configuration, 0.05A @ 12VDC contact rating, through-hole mounting, and PC pin termination. These parts are currently in active production status, ensuring long-term availability.

Parameter Comparison

Engineering Selection Recommendations

MJTP1144 Selection Criteria: This substitute is suitable for applications where the original PTS645TH43 LFS actuator height of 4.30mm is required. The MJTP1144 maintains identical actuator height while providing equivalent electrical performance. The operating force of 160gf is lower than the original 200gf specification. The operating temperature range of -20°C to 70°C is narrower than the original -40°C to 85°C range. This part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating.

MJTP1144A Selection Criteria: This substitute features a taller actuator height of 5.00mm, suitable for applications requiring increased vertical clearance or accessibility. Like the MJTP1144, it maintains SPST-NO circuit configuration and 0.05A @ 12VDC contact rating. The operating force and temperature range are identical to the MJTP1144. This part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating.

Compliance Considerations: Both substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the original component. Both are classified under ECCN EAR99 and HTSUS 8536.50.9031, consistent with the main part.

Frequently Asked Questions (FAQ)

Q: Can MJTP1144 and MJTP1144A be used interchangeably with PTS645TH43 LFS?

A: Both APEM parts are electrically equivalent to the PTS645TH43 LFS, sharing identical SPST-NO circuit configuration, 0.05A @ 12VDC contact rating, and momentary switch function. The primary difference is actuator height: MJTP1144 matches the original 4.30mm height, while MJTP1144A provides 5.00mm height. Selection depends on PCB layout and actuator clearance requirements.

Q: What are the key differences between MJTP1144 and MJTP1144A?

A: The primary difference is actuator height. MJTP1144 features 4.30mm height matching the original PTS645TH43 LFS, while MJTP1144A features 5.00mm height. Both parts share identical electrical specifications, operating force (160gf), operating temperature range (-20°C to 70°C), and mechanical life (100,000 cycles).

Q: Are there any temperature range limitations when substituting?

A: The substitute parts operate within -20°C to 70°C, which is narrower than the original PTS645TH43 LFS range of -40°C to 85°C. Applications requiring operation below -20°C or above 70°C should not use these substitutes.

Q: How do the operating forces compare?

A: The PTS645TH43 LFS specifies 200gf operating force, while both MJTP1144 and MJTP1144A specify 160gf. This 40gf difference may affect tactile feedback and actuation feel in applications sensitive to switch force characteristics.

Q: Are the outline dimensions compatible with the original PCB layout?

A: The PTS645TH43 LFS has 6.00mm x 6.00mm outline dimensions, while both APEM substitutes have 6.10mm x 6.10mm dimensions. This 0.10mm increase in each dimension should be verified against PCB footprint tolerances and adjacent component spacing.

Q: What is the current availability status of these substitute parts?

A: MJTP1144 and MJTP1144A are both in active production status, ensuring ongoing availability. The original PTS645TH43 LFS is obsolete, making these active substitutes the recommended sourcing option for new designs and ongoing production.