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

Part Overview

The Littelfuse 59040-3-S-02-F is a magnetic reed switch sensor with SPDT (Single Pole Double Throw) output configuration, designed for applications requiring contact switching via magnetic actuation. This component features wire lead termination and press-fit packaging, operating across an industrial temperature range of -40°C to 105°C.

The 59040-3-S-02-F is classified as obsolete. Identifying functionally equivalent substitute parts is essential for maintaining design continuity, ensuring supply chain reliability, and supporting long-term product serviceability.

Substiute Parts

59040-3-S-02-F

LittelfuseIn Stock: 98059040-3-S-02-F Datasheet

Current PartRFQ

59040-3-S-02-A

Littelfuse Inc.In Stock: 107059040-3-S-02-A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 59040-3-S-02-F is determined by strict equivalence across the following critical parameters:

• Reed Switch Type: SPDT output configuration
• Actuator Mechanism: Magnetic actuation
• Termination Interface: Wire leads
• Actuation Distance: 21.00 mm must-operate specification
• Operating Temperature Range: -40°C to 105°C
• Package Configuration: Press-fit form factor
• Regulatory Compliance: ROHS3 compliance requirement

The substitute part 59040-3-S-02-A matches all specified parameters and belongs to the same 59040 series, confirming functional and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The 59040-3-S-02-A is the direct substitute for the obsolete 59040-3-S-02-F. Both components are manufactured by Littelfuse within the same 59040 series and maintain identical electrical and mechanical specifications across all critical parameters.

The 59040-3-S-02-A carries active product status, ensuring ongoing manufacturer support, availability, and compliance certification. The component maintains ROHS3 compliance and is unaffected by REACH regulations, confirming suitability for current regulatory environments.

Current inventory of the 59040-3-S-02-A is 1052 pieces in new original condition, providing supply security for design transitions and production requirements.

Frequently Asked Questions (FAQ)

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

A: Yes. Both components are functionally and mechanically equivalent across all specified parameters, including SPDT output, 21.00 mm actuation distance, wire lead termination, press-fit packaging, and operating temperature range. No design modification is required.

Q: What is the difference between the -F and -A suffix designations?

A: The suffix indicates packaging configuration. The -F variant uses standard packaging, while the -A variant uses box packaging. This distinction does not affect electrical or mechanical performance.

Q: Are there any compliance or certification differences between these parts?

A: Both components maintain identical ROHS3 compliance and MSL rating. The 59040-3-S-02-A additionally confirms REACH unaffected status, providing enhanced regulatory documentation.

Q: Why is the 59040-3-S-02-F classified as obsolete?

A: Obsolescence reflects manufacturer discontinuation of this specific packaging variant. The functionally equivalent 59040-3-S-02-A remains in active production and is the recommended replacement.

Q: What parameters must remain constant for substitution eligibility?

A: SPDT output type, magnetic actuation, wire lead termination, 21.00 mm must-operate distance, -40°C to 105°C operating range, press-fit package form, and ROHS3 compliance are non-negotiable substitution criteria.