PTS635SL43SMTR LFS Equivalent & Substitute Parts

Part Overview

The PTS635SL43SMTR 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 surface mount component features a rectangular button actuator with top actuation, gull wing termination, and a 6.00mm × 4.60mm outline. The product is currently obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Active alternatives from established manufacturers provide functional equivalence while maintaining compliance with RoHS3 and REACH standards.

Substiute Parts

PTS635SL43SMTR LFS

C&KIn Stock: 1166PTS635SL43SMTR LFS Datasheet

Current PartRFQ

FSMSM

TE Connectivity ALCOSWITCH SwitchesIn Stock: 14120FSMSM Datasheet

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MJTP1106S

APEM Inc.In Stock: 962MJTP1106S Datasheet

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MJTP1106SATR

APEM Inc.In Stock: 7395MJTP1106SATR Datasheet

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MJTP1106STR

APEM Inc.In Stock: 7231MJTP1106STR Datasheet

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TL3302AF130QG

E-SwitchIn Stock: 4675TL3302AF130QG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration: SPST-NO
• Switch function: Off-Mom (Momentary)
• Contact rating voltage: 12VDC (primary group) or 24VDC (secondary group with voltage derating consideration)
• Mounting type: Surface Mount
• Actuator orientation: Top Actuated
• Termination style: Gull Wing
• Outline dimensions: 6.00mm × 4.60mm

Substitute Parts Identified:

Group 1 - Direct 12VDC Equivalents (Preferred):

• MJTP1106S (APEM Inc., Bulk packaging)
• MJTP1106STR (APEM Inc., Tape & Reel)
• MJTP1106SATR (APEM Inc., Tape & Reel)
• TL3302AF130QG (E-Switch, Tape & Reel)

Group 2 - Voltage-Rated Alternative:

• FSMSM (TE Connectivity ALCOSWITCH Switches, 24VDC rated)

All substitute parts maintain SPST-NO circuit configuration, surface mount construction, top actuation, gull wing termination, and identical outline dimensions. Variations in operating force, actuator height, mechanical life, and temperature range are secondary parameters that do not preclude substitution but require application-level verification.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (12VDC Direct Equivalents):

MJTP1106S, MJTP1106STR, and MJTP1106SATR from APEM Inc. are functionally equivalent to the PTS635SL43SMTR LFS. All three maintain identical contact ratings at 12VDC, circuit configuration, mounting type, actuator orientation, termination style, and outline dimensions. These parts are currently active in production and carry full RoHS3 compliance and REACH unaffected status. The primary distinction among these three is packaging format: MJTP1106S is supplied in bulk, while MJTP1106STR and MJTP1106SATR are supplied in Tape & Reel format. Selection between these variants depends on assembly process requirements and inventory management practices.

TL3302AF130QG from E-Switch provides an alternative 12VDC equivalent with identical contact rating, circuit configuration, and outline dimensions. This part is supplied in Tape & Reel format and maintains full RoHS3 compliance and REACH unaffected status. Operating force matches the original specification at 130gf.

Secondary Substitute (24VDC Rated):

FSMSM from TE Connectivity ALCOSWITCH Switches operates at 24VDC, representing a voltage-rated alternative. This part maintains SPST-NO circuit configuration, surface mount construction, top actuation, gull wing termination, and identical outline dimensions. The 24VDC rating provides margin in higher-voltage applications but requires verification that the application circuit operates at or below 24VDC. This part is supplied in bulk packaging and carries full RoHS3 compliance and REACH unaffected status.

Compliance Verification:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original component. Moisture sensitivity levels are consistent across primary substitutes (MSL 1 - Unlimited), supporting identical handling and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can MJTP1106SATR be used as a direct replacement for PTS635SL43SMTR LFS?

A: MJTP1106SATR is functionally equivalent in circuit configuration, contact rating, mounting type, actuator orientation, termination style, and outline dimensions. The actuator height differs at 5.00mm versus 4.30mm on the original part. This variation requires verification that the application's mechanical envelope accommodates the increased height. All electrical parameters and compliance certifications are equivalent.

Q: What is the difference between MJTP1106S, MJTP1106STR, and MJTP1106SATR?

A: These three APEM Inc. parts are electrically and mechanically identical except for packaging and actuator height. MJTP1106S is supplied in bulk packaging. MJTP1106STR and MJTP1106SATR are supplied in Tape & Reel format. MJTP1106STR maintains the 4.30mm actuator height matching the original specification, while MJTP1106SATR features a 5.00mm actuator height. Selection depends on assembly process requirements and mechanical envelope constraints.

Q: Why is FSMSM rated at 24VDC instead of 12VDC?

A: FSMSM is manufactured by TE Connectivity ALCOSWITCH Switches with a 24VDC contact rating. This part maintains the same 0.05A current rating and SPST-NO circuit configuration as the original 12VDC part. The higher voltage rating does not preclude use in 12VDC applications, as the part will operate safely at lower voltages. Application verification is required to confirm circuit voltage compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed—MJTP1106S, MJTP1106STR, MJTP1106SATR, TL3302AF130QG, and FSMSM—carry ROHS3 compliance certification. All are also REACH unaffected, ensuring regulatory alignment with the obsolete PTS635SL43SMTR LFS.

Q: What packaging options are available for substitutes?

A: MJTP1106S is supplied in bulk packaging. MJTP1106STR, MJTP1106SATR, and TL3302AF130QG are supplied in Tape & Reel format. FSMSM is supplied in bulk packaging. Selection depends on assembly process requirements and production volume considerations.

Q: How do mechanical life ratings compare?

A: The original PTS635SL43SMTR LFS specifies 20,000 mechanical cycles. MJTP1106S, MJTP1106STR, and MJTP1106SATR provide 100,000 cycles, representing a five-fold improvement. TL3302AF130QG provides 40,000 cycles. FSMSM matches the original specification at 20,000 cycles. Higher mechanical life ratings provide extended component durability in high-cycle applications.

Q: Can TL3302AF130QG be used as a direct replacement?

A: Yes. TL3302AF130QG maintains identical contact rating at 12VDC, SPST-NO circuit configuration, surface mount construction, rectangular button actuator, top actuation, gull wing termination, and 6.00mm × 4.60mm outline dimensions. Operating force matches at 130gf. This part is supplied in Tape & Reel format and carries full RoHS3 compliance and REACH unaffected status.