PTS635SL43 LFS Equivalent & Substitute Parts

Part Overview

The PTS635SL43 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 switch features a rectangular button actuator with 4.30mm height and is designed for momentary operation. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support and component sourcing.

Key Parameters

Parameter	Value
Manufacturer Part Number	PTS635SL43 LFS
Manufacturer	C&K
Circuit Configuration	SPST-NO
Contact Rating	0.05A @ 12VDC
Mounting Type	Through Hole
Actuator Height (PCB)	4.30mm
Outline Dimensions	6.00mm x 4.60mm
Operating Force	130gf
Operating Temperature Range	-40°C ~ 60°C
Mechanical Life	20,000 Cycles
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the PTS635SL43 LFS is determined by the following critical parameters:

Circuit Configuration: Must be SPST-NO
Contact Rating Voltage: 12VDC operation (or higher voltage rating with 12VDC compatibility)
Contact Current Rating: 0.05A minimum
Mounting Type: Through Hole
Actuator Height: 4.30mm
Outline Dimensions: 6.00mm x 4.60mm
Termination Style: PC Pin
RoHS Compliance: ROHS3 Compliant

All substitute parts listed meet these core electrical and mechanical compatibility criteria. Variations in operating force, mechanical life, temperature range, and actuator material do not prevent functional substitution when the above parameters align.

Parameter Comparison

Parameter	PTS635SL43 LFS (C&K)	EVQ-PE504K (Panasonic)	1825966-1 (TE Connectivity)	TL1107AF130WQ (E-Switch)	MJTP1243 (APEM)
Circuit Configuration	SPST-NO	SPST-NO	SPST-NO	SPST-NO	SPST-NO
Contact Rating	0.05A @ 12VDC	0.05A @ 12VDC	0.05A @ 24VDC	0.05A @ 12VDC	0.05A @ 12VDC
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Actuator Height (PCB)	4.30mm	4.30mm	4.30mm	4.30mm	4.30mm
Outline Dimensions	6.00mm x 4.60mm	6.00mm x 4.60mm	6.00mm x 4.60mm	6.00mm x 4.60mm	6.00mm x 4.60mm
Operating Force	130gf	160gf	130gf	130gf	180gf
Operating Temperature Range	-40°C ~ 60°C	-30°C ~ 85°C	-35°C ~ 85°C	-20°C ~ 70°C	-20°C ~ 70°C
Mechanical Life	20,000 Cycles	50,000 Cycles	100,000 Cycles	40,000 Cycles	50,000 Cycles
Termination Style	PC Pin	PC Pin	PC Pin	PC Pin	PC Pin
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and REACH unaffected status, providing long-term availability and regulatory compliance advantages over the obsolete PTS635SL43 LFS.

EVQ-PE504K (Panasonic Electronic Components): Direct electrical equivalent at 0.05A @ 12VDC with identical mechanical dimensions and actuator height. Extended operating temperature range (-30°C ~ 85°C) and improved mechanical life (50,000 cycles) provide enhanced performance margins.

1825966-1 (TE Connectivity ALCOSWITCH Switches): Rated for 0.05A @ 24VDC, providing higher voltage margin while maintaining 12VDC compatibility. Superior mechanical life specification (100,000 cycles) and extended temperature range (-35°C ~ 85°C) support demanding applications.

TL1107AF130WQ (E-Switch): Exact electrical match at 0.05A @ 12VDC with identical operating force (130gf). Mechanical life of 40,000 cycles and operating temperature range of -20°C ~ 70°C provide adequate performance for standard applications.

MJTP1243 (APEM Inc.): Electrical equivalent at 0.05A @ 12VDC with higher operating force (180gf) and mechanical life (50,000 cycles). Operating temperature range of -20°C ~ 70°C is suitable for standard industrial environments.

Frequently Asked Questions (FAQ)

Q: Can the 1825966-1 (24VDC rated) be used in a 12VDC circuit? A: Yes. The 1825966-1 is rated for 0.05A @ 24VDC, which means it can safely operate at lower voltages including 12VDC. The higher voltage rating provides additional safety margin.

Q: What is the primary difference between these substitute parts? A: All substitutes share identical circuit configuration (SPST-NO), mounting type (through hole), and mechanical dimensions (6.00mm x 4.60mm outline, 4.30mm actuator height). Differences exist in operating force (130gf to 180gf), mechanical life (40,000 to 100,000 cycles), and temperature operating ranges.

Q: Are all substitutes pin-compatible with the original PTS635SL43 LFS? A: Yes. All substitute parts use PC Pin termination style with identical outline dimensions and actuator height, ensuring direct PCB footprint compatibility.

Q: Which substitute offers the longest mechanical life? A: The 1825966-1 (TE Connectivity) provides the highest mechanical life specification at 100,000 cycles, compared to 20,000 cycles for the original part.

Q: Do all substitutes meet RoHS compliance requirements? A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Q: What is the difference in operating force between substitutes? A: Operating force ranges from 130gf (PTS635SL43 LFS, 1825966-1, TL1107AF130WQ) to 180gf (MJTP1243). The EVQ-PE504K operates at 160gf. These variations may affect tactile feedback characteristics but do not prevent functional substitution.

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