MEC Switches 3FTH945 Tactile Switch SPST-NO Equivalent & Substitute Parts

Part Overview

The MEC Switches 3FTH945 is a tactile switch with SPST-NO (Single Pole Single Throw - Normally Open) circuit configuration, rated for 0.05A at 24VDC. This illuminated switch features a top-actuated plunger design with yellow LED illumination and is housed in a sealed, through-hole package meeting IP67 ingress protection standards. The 3FTH945 is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications.

Substiute Parts

3FTH945

MEC SwitchesIn Stock: 10093FTH945 Datasheet

Current PartRFQ

3FTH946

MEC SwitchesIn Stock: 29233FTH946 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The 3FTH946 qualifies as a direct substitute for the 3FTH945 based on the following critical parameters:

• Circuit Configuration: Both parts maintain SPST-NO circuit topology
• Contact Rating: Identical 0.05A @ 24VDC electrical specification
• Mechanical Interface: Matching plunger actuator type, through-hole mounting, 10.40mm actuator height, and 10.10mm x 10.10mm outline dimensions
• Actuator Characteristics: Identical 300gf operating force and 1.00mm switch travel
• Environmental Protection: Both rated IP67 for sealed, dust-tight, waterproof operation
• Temperature Range: Identical -40°C ~ 160°C operating window
• Material Composition: Both use PBT actuator material
• Mechanical Durability: Both rated for 10,000,000 cycles
• Compliance: Both ROHS3 compliant with MSL 1 rating

The primary distinction is product status: the 3FTH945 is obsolete while the 3FTH946 is active, with the 3FTH946 available in bulk packaging and higher inventory levels.

Parameter Comparison

Engineering Selection Recommendations

The 3FTH946 is the direct active equivalent for the obsolete 3FTH945. Both parts share identical electrical and mechanical specifications within the Multimec® 3 series, ensuring functional interchangeability in SPST-NO tactile switch applications rated for 0.05A at 24VDC.

The 3FTH946 maintains full ROHS3 compliance and carries REACH Unaffected status, supporting regulatory requirements for new designs and production continuity. The minor variance in illumination voltage (2.0 VDC versus 2.3 VDC nominal) falls within acceptable LED operating tolerances and does not affect circuit compatibility.

For applications requiring the 3FTH945, transition to the 3FTH946 is recommended due to active product status, superior inventory availability, and identical performance characteristics across all critical parameters.

Frequently Asked Questions (FAQ)

Q: Can the 3FTH946 directly replace the 3FTH945 in existing designs?

A: Yes. Both parts are mechanically and electrically identical across all specified parameters, including circuit configuration, contact rating, actuator geometry, mounting interface, and environmental protection rating. PCB layout and component footprints require no modification.

Q: What is the significance of the illumination voltage difference (2.3 VDC vs. 2.0 VDC)?

A: Both values represent nominal LED operating voltages within standard LED specifications. The 0.3 VDC variance is within typical LED tolerance ranges and does not affect circuit functionality or compatibility in applications designed for either specification.

Q: Why is the 3FTH945 classified as obsolete?

A: Product obsolescence reflects manufacturer lifecycle decisions. The 3FTH946 serves as the active production equivalent, offering identical functionality with ongoing supply chain support.

Q: Are there packaging differences between these parts?

A: The 3FTH945 is supplied in standard packaging, while the 3FTH946 is available in bulk packaging. Both use identical PC pin termination and through-hole mounting interfaces. Packaging format does not affect electrical or mechanical performance.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the 3FTH945 and 3FTH946 are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. The 3FTH946 additionally carries REACH Unaffected status, supporting regulatory requirements for new production.

Q: What mechanical life expectancy should be anticipated?

A: Both parts are rated for 10,000,000 mechanical cycles at the specified 300gf operating force and 1.00mm switch travel, ensuring equivalent durability and reliability across the product lifecycle.