UB5C-40RF8 Equivalent & Substitute Parts

Part Overview

The UB5C-40RF8 is a 40 Ohm, 1% tolerance, 5W axial wirewound resistor manufactured by Riedon. This component is designed for through-hole applications requiring current sensing functionality with enhanced reliability features including flame proof, moisture resistant, and pulse withstanding characteristics. The part is currently in active production status with 1075 units available in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the allowed parameter range for this resistor category.

Substiute Parts

UB5C-40RF8

RiedonIn Stock: 1150UB5C-40RF8 Datasheet

Current PartRFQ

45F40RE

OhmiteIn Stock: 121145F40RE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UB5C-40RF8 is determined by strict equivalence across the following critical parameters:

• Resistance value: 40 Ohms
• Tolerance: ±1%
• Power rating: 5W
• Composition: Wirewound
• Package configuration: Axial through-hole
• Temperature coefficient: ±20ppm/°C
• Moisture sensitivity level: 1 (Unlimited)

The substitute part 45F40RE from Ohmite meets all electrical specifications and mechanical compatibility requirements. Both parts maintain identical resistance, tolerance, power rating, composition, and temperature coefficient characteristics. The axial package configuration ensures mechanical interchangeability in standard through-hole PCB layouts. Compliance certifications (RoHS and REACH status) are equivalent or superior, confirming regulatory compatibility.

Parameter Comparison

Engineering Selection Recommendations

The 45F40RE from Ohmite is a direct electrical and mechanical equivalent to the UB5C-40RF8. Both parts are active production components with confirmed inventory availability. The substitute part maintains full compliance with RoHS regulations and shares identical ECCN classification (EAR99), confirming regulatory equivalence for procurement and deployment.

Physical dimensions differ between the two parts: the UB5C-40RF8 measures 0.250" diameter × 0.500" length (6.40mm × 12.70mm), while the 45F40RE measures 0.343" diameter × 0.937" length (8.70mm × 23.80mm). This dimensional variance requires verification of available PCB layout space and component clearance in the target application before substitution.

Frequently Asked Questions (FAQ)

Q: Can the 45F40RE replace the UB5C-40RF8 in all applications?

A: The 45F40RE is electrically equivalent and maintains identical resistance, tolerance, power rating, and temperature coefficient specifications. However, the larger physical dimensions (0.343" diameter × 0.937" length versus 0.250" diameter × 0.500" length) require confirmation that PCB layout space and component clearance accommodate the substitute part.

Q: Are there differences in reliability features between these parts?

A: The UB5C-40RF8 specifies additional features including current sense, flame proof, moisture resistant, and pulse withstanding characteristics. The 45F40RE datasheet does not list these enhanced features. Applications requiring these specific reliability attributes should confirm feature availability with the manufacturer before substitution.

Q: What is the impact of packaging differences?

A: The UB5C-40RF8 is supplied in Tape & Reel (TR) packaging, while the 45F40RE is supplied in Bulk packaging. This affects procurement logistics and component handling but does not impact electrical or mechanical performance in the final assembly.

Q: Are both parts compliant with current regulatory standards?

A: Both parts are RoHS compliant and share EAR99 ECCN classification. The UB5C-40RF8 is ROHS3 compliant, while the 45F40RE is RoHS compliant. Both maintain Moisture Sensitivity Level 1 (Unlimited), confirming equivalent environmental and regulatory compatibility.