Ohmite 45FR25 Equivalent & Substitute Parts

Part Overview

The Ohmite 45FR25 is a 250 mOhms ±1% 5W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is classified as Active product status. Substitute parts are identified when original stock becomes unavailable, when packaging requirements differ, or when compliance certifications need to be verified for specific applications.

Substiute Parts

45FR25

OhmiteIn Stock: 77145FR25 Datasheet

Current PartRFQ

45FR25E

OhmiteIn Stock: 122445FR25E Datasheet

DirectRFQ

45FR25E

OhmiteIn Stock: 122445FR25E Datasheet

DirectRFQ

ALSR05R2500FE12

Vishay DaleIn Stock: 1203ALSR05R2500FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 45FR25 are qualified based on the following electrical and mechanical parameters:

• Resistance value: 250 mOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 5W (exact match required)
• Composition: Wirewound (exact match required)
• Package: Axial (exact match required)
• Number of terminations: 2 (exact match required)

The identified substitutes maintain these core specifications. Variations in packaging format (Bulk vs. standard), RoHS compliance status, and physical dimensions within acceptable tolerances do not affect functional equivalence for this resistor category.

Parameter Comparison

Engineering Selection Recommendations

45FR25E (Ohmite): Direct manufacturer equivalent with identical electrical specifications and physical dimensions. Differs in packaging format (Bulk) and RoHS compliance status (RoHS Compliant). Select when RoHS compliance is required or when bulk packaging meets procurement requirements.

ALSR05R2500FE12 (Vishay Dale): Cross-manufacturer substitute with identical electrical specifications. Physical dimensions are slightly smaller (0.312" Dia x 0.875" L vs. 0.343" Dia x 0.937" L). Includes moisture-resistant construction and extended operating temperature range (-65°C ~ 250°C). RoHS3 compliant. Select when space constraints permit smaller dimensions, moisture resistance is beneficial, or extended temperature operation is required.

Frequently Asked Questions (FAQ)

Q: Can 45FR25E be used as a direct replacement for 45FR25? A: Yes. Both parts share identical electrical specifications (250 mOhms, ±1%, 5W) and physical dimensions. The primary difference is RoHS compliance status and packaging format.

Q: What are the physical dimension differences between 45FR25 and ALSR05R2500FE12? A: The ALSR05R2500FE12 is slightly smaller: 0.312" Dia x 0.875" L compared to 0.343" Dia x 0.937" L for the 45FR25. This difference may affect board layout and mounting considerations.

Q: Does ALSR05R2500FE12 have the same temperature coefficient as 45FR25? A: The temperature coefficient for ALSR05R2500FE12 is not specified in the provided data. The 45FR25 specifies ±90ppm/°C. Verify temperature stability requirements before selection.

Q: Are all three parts suitable for the same circuit applications? A: All three parts meet the core electrical requirements (250 mOhms, ±1%, 5W, wirewound, axial). Selection depends on RoHS compliance needs, physical space constraints, and operating temperature range requirements.

Q: What is the difference between standard packaging and Bulk packaging? A: Packaging format affects order quantity and delivery method. Bulk packaging typically accommodates larger order quantities. Electrical and mechanical specifications remain identical.