Littelfuse 59040-3-T-02-F Magnetic Reed Switch Equivalent & Substitute Parts

Part Overview

The Littelfuse 59040-3-T-02-F is a magnetic reed switch sensor with SPDT (Single Pole Double Throw) output configuration and wire lead termination. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Reed switches of this type are electromagnetic sensors that respond to magnetic field presence, commonly used in proximity detection, position sensing, and security applications. The obsolete status necessitates evaluation of available substitute components that maintain functional and mechanical compatibility.

Substiute Parts

59040-3-T-02-F

Littelfuse Inc.In Stock: 118259040-3-T-02-F Datasheet

Current PartRFQ

59040-3-T-02-A

Littelfuse Inc.In Stock: 157859040-3-T-02-A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 59040-3-T-02-F is determined by the following critical parameters:

• Output Configuration: SPDT topology must be maintained for circuit compatibility
• Actuator Type: Magnetic actuation is required
• Termination Style: Wire lead connections must be preserved
• Must Operate Distance: 18.40mm activation threshold must be matched
• Series Compatibility: Parts within the Littelfuse 59040 series maintain design consistency
• Regulatory Compliance: RoHS3 compliance and MSL rating must be equivalent or superior

The substitute part 59040-3-T-02-A shares all critical functional parameters with the main part while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

The 59040-3-T-02-A is a direct functional equivalent to the 59040-3-T-02-F. Both components are manufactured by Littelfuse Inc. within the same product series and maintain identical electrical and mechanical specifications for the critical parameters governing substitution.

The primary distinction is product lifecycle status: the 59040-3-T-02-F is obsolete while the 59040-3-T-02-A maintains active production status. The substitute part provides superior long-term availability and supply chain reliability. Both components meet ROHS3 compliance requirements and carry equivalent moisture sensitivity ratings.

The substitute part includes documented operating temperature range (-40°C ~ 105°C) and REACH compliance status, providing additional regulatory clarity for applications requiring environmental certification documentation.

Frequently Asked Questions (FAQ)

Q: Can the 59040-3-T-02-A directly replace the 59040-3-T-02-F in existing designs?

A: Yes. Both components share identical SPDT output configuration, 18.40mm magnetic actuation distance, wire lead termination, and series designation. No circuit modifications are required.

Q: What is the difference between the packaging designations "Module, Wire Leads" and "Press Fit"?

A: The main part uses a module configuration with wire leads for direct connection. The substitute uses press fit termination, also with wire leads. Both support wire lead connectivity; the press fit designation indicates the internal mounting method within the component assembly.

Q: Are there any compliance differences between these parts?

A: Both components are ROHS3 compliant with MSL rating of 1 (Unlimited). The substitute part includes documented REACH compliance status (REACH Unaffected), providing additional regulatory documentation for supply chain requirements.

Q: Why is the main part listed as obsolete?

A: Product obsolescence typically results from manufacturer lifecycle decisions. The substitute part 59040-3-T-02-A remains in active production, ensuring continued availability and support.

Q: What parameters must remain constant when selecting a substitute reed switch?

A: Output configuration (SPDT), actuator type (magnet), termination style (wire leads), and must operate distance (18.40mm) are the critical parameters determining substitution eligibility. Series alignment (59040) ensures design consistency within the Littelfuse product family.