45F7R5E Equivalent & Substitute Parts

Part Overview

The 45F7R5E is a 7.5 Ohms ±1% 5W through-hole resistor manufactured by Ohmite, part of the Ohmicone® 40 series. This axial wirewound resistor is designed for applications requiring precision resistance with high power dissipation capability. The part is currently active in production with 942 units in stock. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits alternative sourcing from qualified manufacturers meeting identical electrical and mechanical specifications.

Substiute Parts

45F7R5E

OhmiteIn Stock: 95845F7R5E Datasheet

Current PartRFQ

RS0057R500FE73

Vishay DaleIn Stock: 3479RS0057R500FE73 Datasheet

SimilarRFQ

UB5C-7R5F1

RiedonIn Stock: 1541UB5C-7R5F1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 45F7R5E are qualified based on the following critical parameters:

• Resistance value: 7.5 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 5W (exact match required)
• Temperature coefficient: ±50ppm/°C (exact match required)
• Package configuration: Axial wirewound (exact match required)
• Number of terminations: 2 (exact match required)
• RoHS compliance status (equivalent or higher compliance level acceptable)

The identified substitute parts RS0057R500FE73 (Vishay Dale) and UB5C-7R5F1 (Riedon) meet all core electrical and mechanical parameters. Variations in physical dimensions, operating temperature range limits, and packaging format (cut tape vs. bulk) do not affect functional substitution when circuit requirements are met.

Parameter Comparison

Engineering Selection Recommendations

All three parts meet the core electrical requirements for 7.5 Ohms ±1% 5W axial wirewound resistor applications. Selection between the main part and substitutes is determined by availability, packaging requirements, and compliance certifications:

• 45F7R5E (Ohmite): Primary choice when available. Supports the widest operating temperature range (-55°C to 275°C). RoHS Compliant. Supplied in box packaging.

• RS0057R500FE73 (Vishay Dale): Qualified substitute with ROHS3 compliance. Includes moisture-resistant feature. Operating temperature range -65°C to 250°C. Available in cut tape packaging. Highest inventory availability (3437 units).

• UB5C-7R5F1 (Riedon): Qualified substitute with ROHS3 compliance. Includes current sense, flame proof, moisture resistant, pulse withstanding, and safety features. Operating temperature range -55°C to 250°C. Compact physical dimensions (0.250" Dia x 0.500" L). Available in bulk packaging.

Physical dimension variations exist among the three parts. Verify PCB layout compatibility when substituting, particularly with the UB5C-7R5F1 due to its smaller form factor.

Frequently Asked Questions (FAQ)

Q: Can RS0057R500FE73 replace 45F7R5E in all applications?

A: Yes, for applications operating within -65°C to 250°C. The 45F7R5E supports higher temperatures (up to 275°C). Verify your circuit's maximum operating temperature requirement before substitution.

Q: What is the primary difference between UB5C-7R5F1 and the other two parts?

A: The UB5C-7R5F1 has a significantly smaller physical footprint (0.250" Dia x 0.500" L versus 0.343" Dia x 0.937" L for 45F7R5E). It includes additional features: current sense capability, flame proof construction, pulse withstanding, and safety certification. Verify PCB layout compatibility before selection.

Q: Are all three parts RoHS compliant?

A: Yes. The 45F7R5E is RoHS Compliant. Both RS0057R500FE73 and UB5C-7R5F1 are ROHS3 Compliant, representing a higher compliance standard.

Q: Does packaging format affect electrical performance?

A: No. Box, cut tape, and bulk packaging formats do not affect electrical characteristics. Selection is based on procurement workflow and inventory management requirements.

Q: Can I use UB5C-7R5F1 in a space-constrained design?

A: The UB5C-7R5F1 offers the smallest dimensions among the three parts. However, verify that the reduced size does not conflict with your PCB layout, thermal management requirements, or lead spacing specifications.

Q: What is the temperature coefficient significance?

A: All three parts share ±50ppm/°C temperature coefficient, ensuring consistent resistance stability across temperature variations. This parameter is identical across all substitutes.