PTS645TL43-2 LFS Equivalent & Substitute Parts

Part Overview

The PTS645TL43-2 LFS is an active SPST-NO tactile switch manufactured by C&K, designed for through-hole mounting applications requiring momentary contact operation at 0.05A and 12VDC. This component is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1) and rated for 100,000 mechanical cycles. Substitute parts are identified based on matching circuit topology, mounting configuration, contact rating, and mechanical compatibility within the specified parameter envelope.

Substiute Parts

PTS645TL43-2 LFS

C&KIn Stock: 2739PTS645TL43-2 LFS Datasheet

Current PartRFQ

1825955-2

TE Connectivity ALCOSWITCH SwitchesIn Stock: 260621825955-2 Datasheet

SimilarRFQ

TLE1105F160Q

E-SwitchIn Stock: 3942TLE1105F160Q Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PTS645TL43-2 LFS are qualified based on the following criteria:

Primary Compatibility Parameters:

• Circuit topology: SPST-NO momentary contact
• Contact rating: 0.05A maximum current capacity
• Mounting configuration: Through-hole with PC pin termination
• Physical footprint: 6.00mm x 6.00mm outline
• Actuator height: 4.30mm vertical clearance
• Mechanical durability: 100,000 cycle minimum life

Allowable Variations:

• Voltage rating: Substitute parts may exceed the 12VDC specification (backward compatible at lower voltages)
• Operating force: Variations within tactile switch standard range (130gf–160gf) are acceptable for equivalent functionality
• Operating temperature: Substitute parts must maintain minimum -20°C lower bound; upper bound of 70°C or higher is acceptable
• Actuator material: Polyamide (PA66) or Polybutylene Terephthalate (PBT) are functionally equivalent
• Switch travel: Variations up to 0.25mm are within tactile switch tolerance

Parameter Comparison

Engineering Selection Recommendations

1825955-2 (TE Connectivity ALCOSWITCH Switches)

This substitute is qualified for applications where voltage headroom is required. The 24VDC contact rating provides margin above the 12VDC specification of the primary part. Physical and electrical compatibility is confirmed through matching outline dimensions, actuator height, PC pin termination, and 100,000-cycle mechanical life. Operating temperature range (-35°C ~ 85°C) covers the primary application envelope. ROHS3 compliance and MSL 1 rating match the original specification. The 160gf operating force represents a 23% increase over the primary part; this variation is within standard tactile switch tolerance and does not affect functional compatibility in momentary contact circuits.

TLE1105F160Q (E-Switch)

This substitute provides direct voltage compatibility at 12VDC, matching the primary part specification. Mechanical and physical parameters align identically: 6.00mm x 6.00mm outline, 4.30mm actuator height, PC pin termination, and 100,000-cycle life. ROHS3 compliance and MSL 1 rating are maintained. The operating temperature range (-20°C ~ 70°C) is narrower than the primary part; this substitute is suitable for applications within the -20°C to 70°C envelope. The 160gf operating force and 0.25mm switch travel fall within acceptable tactile switch parameter variation.

Both substitutes maintain active product status and full regulatory compliance. Selection between substitutes depends on application-specific requirements: voltage margin preference, temperature range requirements, and operating force tolerance.

Frequently Asked Questions (FAQ)

Q: Can 1825955-2 be used in a 12VDC circuit designed for PTS645TL43-2 LFS?

A: Yes. The 1825955-2 is rated for 0.05A @ 24VDC, which exceeds the 12VDC requirement. Contact rating is backward compatible; a component rated for higher voltage operates safely at lower voltages within its current capacity specification.

Q: What is the difference in operating force between the primary part and substitutes?

A: PTS645TL43-2 LFS requires 130gf actuation force. Both substitutes (1825955-2 and TLE1105F160Q) require 160gf. This 30gf difference is within standard tactile switch tolerance and does not affect circuit functionality in momentary contact applications. User perception of button feel may vary slightly.

Q: Are all three parts pin-compatible?

A: Yes. All three parts share identical through-hole PC pin termination, 6.00mm x 6.00mm outline dimensions, and 4.30mm actuator height. Direct PCB footprint compatibility is confirmed.

Q: Which substitute should be selected for extended temperature operation?

A: For applications requiring operation below -20°C, the 1825955-2 (rated -35°C ~ 85°C) is preferred over TLE1105F160Q (rated -20°C ~ 70°C). The primary part PTS645TL43-2 LFS supports the widest range (-40°C ~ 85°C).

Q: Do all parts meet the same regulatory compliance standards?

A: Yes. PTS645TL43-2 LFS, 1825955-2, and TLE1105F160Q are all ROHS3 compliant with MSL 1 (unlimited moisture sensitivity) rating. REACH status is unaffected for all three parts.

Q: What is the significance of switch travel variation (0.10mm vs. 0.25mm)?

A: Switch travel represents the distance the actuator moves before electrical contact is established. Variations of 0.10mm to 0.25mm are within tactile switch design tolerance. Both values produce equivalent momentary contact closure in standard applications.