Littelfuse 59021-1-S-04-F Magnetic Reed Switch Equivalent & Substitute Parts

Part Overview

The Littelfuse 59021-1-S-04-F is a magnetic reed switch sensor with SPST-NO (Single Pole Single Throw - Normally Open) output configuration, designed for applications requiring contact closure through magnetic actuation. This component features wire lead termination and operates across an industrial temperature range of -40°C to 105°C.

The 59021-1-S-04-F has reached obsolete product status. Identifying qualified substitute components ensures design continuity and maintains supply chain reliability for applications currently utilizing this magnetic sensor.

Substiute Parts

59021-1-S-04-F

Littelfuse Inc.In Stock: 104659021-1-S-04-F Datasheet

Current PartRFQ

59021-1-S-02-F

Littelfuse Inc.In Stock: 111959021-1-S-02-F Datasheet

MFR RecommendedRFQ

59021-1-S-05-A

Littelfuse Inc.In Stock: 68559021-1-S-05-A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the 59021-1-S-04-F are qualified based on the following critical parameters that determine functional equivalence:

• Reed Switch Type: SPST-NO output configuration
• Actuator Mechanism: Magnetic actuation
• Termination Interface: Wire leads
• Magnetic Sensitivity: 6.00mm must-operate distance
• Temperature Capability: -40°C to 105°C operating range
• Environmental Compliance: ROHS3 compliance and MSL rating
• Manufacturer Continuity: Littelfuse Inc. series 59021

Both substitute parts maintain identical electrical and mechanical specifications across these parameters, ensuring direct functional replacement within the original application circuit.

Parameter Comparison

Engineering Selection Recommendations

The 59021-1-S-04-F has transitioned to obsolete status. Both substitute parts—59021-1-S-02-F and 59021-1-S-05-A—maintain active product status with Littelfuse Inc., ensuring ongoing availability and manufacturer support.

59021-1-S-02-F is the manufacturer-recommended primary substitute. This part carries identical electrical and mechanical specifications with active product status and ROHS3 compliance. Packaging is specified as Box format with confirmed inventory availability.

59021-1-S-05-A serves as an alternative substitute, also maintaining active product status and full specification equivalence. This option provides additional supply chain flexibility.

Both substitutes satisfy all compliance requirements including ROHS3 certification and MSL rating. Selection between the two substitutes may be determined by packaging requirements, inventory availability, or procurement lead times.

Frequently Asked Questions (FAQ)

Q: Are the substitute parts electrically identical to the 59021-1-S-04-F?

A: Yes. Both substitute parts maintain identical SPST-NO output configuration, 6.00mm magnetic actuation distance, and -40°C to 105°C operating temperature range. Electrical performance is equivalent for direct circuit replacement.

Q: What is the primary difference between the two substitute options?

A: The 59021-1-S-02-F specifies Box packaging, while the 59021-1-S-05-A packaging designation is not specified in the available data. Both parts are functionally equivalent. Selection should be based on packaging requirements and inventory availability.

Q: Are both substitutes RoHS compliant?

A: Yes. Both 59021-1-S-02-F and 59021-1-S-05-A carry ROHS3 compliance certification, matching the original part's environmental standards.

Q: Can these substitutes be used in existing designs without modification?

A: Yes. The substitute parts maintain identical wire lead termination, probe package configuration, and magnetic sensitivity specifications. No circuit or mechanical redesign is required.

Q: Why is the original part obsolete?

A: Product obsolescence is determined by manufacturer lifecycle decisions. Active substitute parts from the same series ensure continued functionality and design support.