Equivalent & Substitute Parts for Ohmite 45FR50

Part Overview

The Ohmite 45FR50 is a 500 mOhms ±1% 5W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is classified as Active product status. Substitute parts are identified when original stock availability is limited, when alternative packaging formats are required, or when enhanced compliance certifications are needed for specific applications.

Substiute Parts

45FR50

OhmiteIn Stock: 79745FR50 Datasheet

Current PartRFQ

45FR50E

OhmiteIn Stock: 133345FR50E Datasheet

DirectRFQ

ALSR05R5000FE12

Vishay DaleIn Stock: 3144ALSR05R5000FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 45FR50 are qualified based on the following critical parameters:

• Resistance value: 500 mOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 5W (exact match required)
• Composition: Wirewound (exact match required)
• Package: Axial through-hole (exact match required)
• Temperature coefficient: ±90ppm/°C (exact match required)
• Termination count: 2 (exact match required)

All identified substitutes meet these electrical and mechanical specifications. Physical dimensions may vary within acceptable tolerances for axial component mounting.

Parameter Comparison

Engineering Selection Recommendations

45FR50E (Ohmite): Direct equivalent from the same manufacturer with identical electrical specifications and physical dimensions. Offers ROHS3 compliance, addressing regulatory requirements where the original 45FR50 does not. Suitable for applications requiring RoHS certification.

ALSR05R5000FE12 (Vishay Dale): Cross-manufacturer substitute meeting all core electrical parameters. Provides ROHS3 compliance and moisture-resistant construction. Physical dimensions are slightly smaller (0.312" Dia x 0.875" L versus 0.343" Dia x 0.937" L). Specifies operating temperature range of -65°C ~ 250°C. Suitable for applications requiring enhanced environmental protection and extended temperature operation.

Frequently Asked Questions (FAQ)

Q: Can 45FR50E be used as a direct replacement for 45FR50?

A: Yes. Both parts share identical electrical specifications (500 mOhms ±1%, 5W, ±90ppm/°C) and physical dimensions (0.343" Dia x 0.937" L). The primary difference is RoHS compliance status. 45FR50E is ROHS3 compliant while 45FR50 is not.

Q: What are the physical dimension differences between substitutes?

A: The 45FR50 and 45FR50E are identical at 0.343" Dia x 0.937" L (8.70mm x 23.80mm). The ALSR05R5000FE12 is slightly smaller at 0.312" Dia x 0.875" L (7.92mm x 22.23mm). Verify PCB layout clearances before substitution.

Q: Does ALSR05R5000FE12 offer additional benefits?

A: ALSR05R5000FE12 includes moisture-resistant construction and specifies an operating temperature range of -65°C ~ 250°C. These features may be advantageous in humid or temperature-extreme environments, though all three parts meet the core 500 mOhms ±1% 5W specification.

Q: Are all substitutes suitable for the same circuit applications?

A: All three parts meet identical electrical specifications for resistance, tolerance, power rating, and temperature coefficient. Substitution compatibility depends on physical space constraints and regulatory compliance requirements specific to your application.

Q: What is the difference between packaging formats?

A: The 45FR50 is listed with unspecified packaging, while 45FR50E and ALSR05R5000FE12 are supplied in Bulk packaging. Verify minimum order quantities and delivery requirements with your supplier.