PSR-28445-E-2 Equivalent & Substitute Parts

Part Overview

The PSR-28445-E-2 is a PTC resettable fuse manufactured by Littelfuse Inc. This component is classified as obsolete, requiring identification of suitable substitute parts for ongoing applications. The PSR series provides overcurrent protection through polymeric PTC (Positive Temperature Coefficient) technology, automatically resetting after fault conditions are cleared. Obsolete status necessitates sourcing of functionally equivalent active alternatives to maintain supply chain continuity.

Substiute Parts

PSR-28445-E-2

Littelfuse Inc.In Stock: 865PSR-28445-E-2 Datasheet

Current PartRFQ

1210L400SLWR

Littelfuse Inc.In Stock: 419331210L400SLWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete PSR-28445-E-2 is based on the following criteria derived from provided parameters:

Manufacturer Consistency: Both the main part and substitute are manufactured by Littelfuse Inc., ensuring design philosophy and quality standards alignment.

Regulatory Compliance: The substitute part maintains RoHS3 compliance and EAR99 ECCN classification, matching the regulatory framework of the original component.

Tariff Classification: Both parts share identical HTSUS code 8533.40.8070, confirming classification within the same product category.

Product Status: The substitute part 1210L400SLWR carries Active status, providing long-term availability and supply security.

Series Designation: The substitute belongs to the POLY-FUSE® LoRho series, representing current-generation polymeric PTC technology from Littelfuse.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 1210L400SLWR

The 1210L400SLWR is the designated substitute for PSR-28445-E-2 based on the following engineering factors:

Regulatory Alignment: Both components maintain compliance with RoHS directives and EAR99 export classification, ensuring regulatory continuity in applications subject to these requirements.

Manufacturer Continuity: Selection of a Littelfuse Inc. substitute preserves design consistency and quality assurance protocols established for the original component.

Active Product Status: The substitute part carries Active status with 41,900 units in stock, providing immediate availability and long-term supply assurance compared to the obsolete original.

Certification Standards: The substitute holds cURus and TUV approvals, meeting recognized safety and performance standards for polymeric PTC resettable fuses.

Moisture Handling: MSL rating of 1 (Unlimited) indicates no moisture sensitivity constraints during storage and handling, simplifying logistics and inventory management.

Frequently Asked Questions (FAQ)

Q: Why is the PSR-28445-E-2 no longer available?

A: The PSR-28445-E-2 carries Obsolete product status, indicating Littelfuse Inc. has discontinued manufacturing. The 1210L400SLWR represents the current-generation equivalent within the POLY-FUSE® product line.

Q: What are the key electrical parameters for substitution compatibility?

A: The substitute part specifies 6V maximum voltage and 4A hold current (Ih). These parameters define the protective characteristics of the resettable fuse. Applications must operate within these electrical limits for proper function.

Q: Does the substitute part fit the same physical footprint?

A: The 1210L400SLWR uses 1210 (3225 Metric) surface mount package with concave profile. Physical dimensions are 3.22mm length × 2.58mm width × 1.00mm maximum thickness. PCB layout compatibility requires verification against original design specifications.

Q: Are there any compliance differences between the original and substitute?

A: The original part specifies RoHS Compliant status, while the substitute specifies ROHS3 Compliant status. ROHS3 represents an updated compliance framework and is fully backward compatible. Both parts share identical HTSUS and ECCN classifications.

Q: What is the operating temperature range for the substitute?

A: The 1210L400SLWR operates across -40°C to 85°C, covering standard industrial and commercial temperature ranges.

Q: How does the trip current specification affect circuit protection?

A: The substitute specifies 8A trip current (It) with 5-second time to trip. This defines the fault detection threshold and response time. Applications requiring different trip characteristics require evaluation of alternative part numbers.

Q: Is the substitute part suitable for tape and reel packaging?

A: Yes, the 1210L400SLWR is supplied in Tape & Reel (TR) packaging format, standard for surface mount component automation and assembly processes.