Littelfuse 59021-1-T-02-A Magnetic Reed Switch Equivalent & Substitute Parts

Part Overview

The Littelfuse 59021-1-T-02-A is a magnetic reed switch with SPST-NO (Single Pole Single Throw - Normally Open) output configuration, designed for applications requiring contact closure via magnetic actuation. This component features wire lead termination and operates across an industrial temperature range of -40°C to 105°C.

The 59021-1-T-02-A is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

59021-1-T-02-A

LittelfuseIn Stock: 71359021-1-T-02-A Datasheet

Current PartRFQ

59010-1-T-02-A

Littelfuse Inc.In Stock: 104059010-1-T-02-A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 59021-1-T-02-A is determined by the following critical parameters:

• Output Type: Must be SPST-NO to maintain electrical compatibility with existing circuit designs
• Actuator Material: Must be Magnet to preserve the magnetic actuation principle
• Termination Style: Must be Wire Leads to ensure mechanical and electrical connection compatibility
• Must Operate Distance: Must be 4.50mm to maintain consistent actuation sensitivity
• Package / Case: Must be Probe to fit existing mechanical assemblies
• RoHS Compliance: Must maintain ROHS3 Compliant status for regulatory alignment

The substitute part 59021-1-T-02-A → 59010-1-T-02-A qualifies as a direct substitute based on matching all critical parameters. The primary distinction is the operating temperature range and product status, which are addressed in the engineering selection recommendations below.

Parameter Comparison

Engineering Selection Recommendations

The 59010-1-T-02-A is a qualified substitute for the obsolete 59021-1-T-02-A based on functional equivalence across all critical electrical and mechanical parameters. Both components share identical output configuration (SPST-NO), actuation method (magnetic), termination style (wire leads), and actuation distance (4.50mm).

The 59010-1-T-02-A carries Active product status, ensuring ongoing manufacturer support, availability, and compliance maintenance. Both parts maintain ROHS3 Compliant certification, satisfying regulatory requirements for new designs and replacements.

The operating temperature range difference (-40°C to 85°C for the substitute versus -40°C to 105°C for the original) must be evaluated against the specific application thermal requirements. If the application operates exclusively within the -40°C to 85°C envelope, the 59010-1-T-02-A provides full functional equivalence. Applications requiring operation above 85°C require thermal performance verification against design specifications.

Frequently Asked Questions (FAQ)

Q: Can the 59010-1-T-02-A directly replace the 59021-1-T-02-A in existing assemblies?

A: Yes, the 59010-1-T-02-A is mechanically and electrically compatible. Both components feature identical probe packaging, wire lead termination, 4.50mm actuation distance, and SPST-NO output. No circuit modifications are required for substitution.

Q: What is the primary difference between these two parts?

A: The 59010-1-T-02-A has a reduced operating temperature range (-40°C to 85°C) compared to the 59021-1-T-02-A (-40°C to 105°C). Additionally, the 59010-1-T-02-A maintains Active product status, whereas the 59021-1-T-02-A is Obsolete.

Q: Is the 59010-1-T-02-A suitable for high-temperature applications?

A: The 59010-1-T-02-A is rated for operation up to 85°C. Applications requiring sustained operation above this temperature require evaluation against specific thermal design requirements. Consult application-specific thermal analysis to confirm suitability.

Q: Are both parts RoHS compliant?

A: Yes, both the 59021-1-T-02-A and 59010-1-T-02-A are ROHS3 Compliant, meeting regulatory requirements for hazardous substance restrictions.

Q: What does the probe package designation mean?

A: The probe package indicates wire lead termination suitable for direct insertion into circuit assemblies or connection to external wiring harnesses. Both parts use identical probe packaging, ensuring mechanical compatibility.