PTS635SH43LFS Equivalent & Substitute Parts

Part Overview

The PTS635SH43LFS 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 a rectangular button actuator with top actuation and is designed for applications requiring momentary switching functionality. The product is currently obsolete, making identification of equivalent and substitute parts essential for design continuity and component sourcing in legacy system maintenance and new designs requiring compatible alternatives.

Substiute Parts

PTS635SH43LFS

C&KIn Stock: 1177PTS635SH43LFS Datasheet

Current PartRFQ

EVQ-PE504K

Panasonic Electronic ComponentsIn Stock: 11197EVQ-PE504K Datasheet

SimilarRFQ

MJTP1250

APEM Inc.In Stock: 5977MJTP1250 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PTS635SH43LFS is determined by the following critical parameters:

• Circuit Configuration: Must be SPST-NO to maintain identical electrical switching behavior
• Contact Rating: Must support 0.05A @ 12VDC minimum to ensure safe operation within specified electrical limits
• Switch Function: Must be Off-Mom (momentary) to preserve application functionality
• Mounting Type: Must be Through Hole to ensure PCB compatibility without redesign
• Termination Style: Must be PC Pin to maintain soldering compatibility
• Actuator Orientation: Must be Top Actuated for consistent user interface and mechanical accessibility
• RoHS Compliance: Must meet ROHS3 Compliant status for regulatory alignment

The substitute parts EVQ-PE504K and MJTP1250 satisfy all mandatory substitution criteria. Variations in actuator height, outline dimensions, operating force, temperature range, and mechanical life represent acceptable engineering tolerances within the allowed parameter set for this product category.

Parameter Comparison

Engineering Selection Recommendations

Both EVQ-PE504K and MJTP1250 are qualified substitutes for the obsolete PTS635SH43LFS based on electrical equivalence and regulatory compliance.

EVQ-PE504K (Panasonic Electronic Components): This substitute maintains identical actuator height (4.30mm) and contact rating specifications. The extended operating temperature range (-30°C ~ 85°C) and doubled mechanical life (50,000 cycles) provide enhanced performance margins. Product status is Active, ensuring long-term availability and supply chain stability. ROHS3 compliance is confirmed.

MJTP1250 (APEM Inc.): This substitute provides equivalent electrical performance with a slightly elevated actuator height (5.00mm) and comparable operating force (180gf). The extended operating temperature range (-20°C ~ 70°C) and doubled mechanical life (50,000 cycles) offer improved durability. Product status is Active with confirmed ROHS3 compliance and documented tactile feedback feature.

Selection between these substitutes depends on specific mechanical envelope constraints and thermal operating requirements of the target application. Both parts maintain full electrical and regulatory compatibility with the original PTS635SH43LFS specification.

Frequently Asked Questions (FAQ)

Q: Can EVQ-PE504K or MJTP1250 be used as direct replacements for PTS635SH43LFS without PCB modification?

A: Both substitutes are through-hole mounted with PC pin termination, matching the original part. However, outline dimension variations (6.10mm x 3.70mm original versus 6.00mm x 4.60mm substitutes) and actuator height differences (4.30mm original, 5.00mm for MJTP1250) may require minor PCB layout verification. EVQ-PE504K maintains identical actuator height, simplifying integration.

Q: What is the significance of the operating force difference between the original and substitute parts?

A: Operating force (200gf original, 160gf for EVQ-PE504K, 180gf for MJTP1250) determines the tactile feedback and activation pressure required. Variations within this range are acceptable for standard momentary switch applications. Application-specific requirements should be evaluated if precise actuation force is critical.

Q: Why do the substitute parts have extended mechanical life specifications?

A: EVQ-PE504K and MJTP1250 both specify 50,000 cycles compared to the original 20,000 cycles. This represents improved component durability and does not affect substitution compatibility. Extended mechanical life provides additional design margin for high-cycle applications.

Q: Are there temperature range limitations when substituting these parts?

A: The original PTS635SH43LFS operates from -40°C to 60°C. EVQ-PE504K extends this to -30°C ~ 85°C, and MJTP1250 to -20°C ~ 70°C. For applications requiring the full -40°C lower temperature limit, EVQ-PE504K is the preferred substitute. For standard industrial temperature ranges, both substitutes are suitable.

Q: What packaging considerations apply to these substitutes?

A: All three parts are supplied in bulk packaging and are through-hole mounted components. No special handling or packaging modifications are required for substitution. Inventory availability differs: PTS635SH43LFS (1,144 pcs), EVQ-PE504K (11,121 pcs), MJTP1250 (5,923 pcs).