UB5C-4RF8 Equivalent & Substitute Parts

Part Overview

The UB5C-4RF8 is a 4 Ohm, ±1% tolerance, 5W axial wirewound resistor manufactured by Riedon. This component is designed for current sensing applications and features flame proof, moisture resistant, and pulse withstanding characteristics. The part is currently in active production status with 1007 units in stock. Substitute parts are necessary to address supply chain flexibility, alternative sourcing options, and inventory management across multiple manufacturers while maintaining identical electrical and mechanical specifications.

Substiute Parts

UB5C-4RF8

RiedonIn Stock: 1114UB5C-4RF8 Datasheet

Current PartRFQ

45F4R0E

OhmiteIn Stock: 163145F4R0E Datasheet

MFR RecommendedRFQ

ALSR054R000FE12

Vishay DaleIn Stock: 1276ALSR054R000FE12 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UB5C-4RF8 is determined by strict equivalence across the following critical parameters:

• Resistance value: 4 Ohms
• Tolerance: ±1%
• Power rating: 5W
• Composition: Wirewound
• Package configuration: Axial through-hole
• Temperature coefficient: ±50ppm/°C
• Termination count: 2
• Moisture Sensitivity Level: 1 (Unlimited)

Both identified substitute parts meet these core electrical and mechanical requirements. Physical dimensions may vary within acceptable limits for axial package types, as long as the component functions within the specified electrical parameters and maintains compatibility with standard through-hole PCB layouts.

Parameter Comparison

Engineering Selection Recommendations

All three parts meet the core electrical specifications for 4 Ohm, ±1%, 5W axial wirewound resistor applications. Selection between the UB5C-4RF8, 45F4R0E, and ALSR054R000FE12 should be based on the following factors:

The UB5C-4RF8 (Riedon) provides the smallest physical footprint at 6.40mm diameter and includes documented current sensing features with flame proof and pulse withstanding characteristics. This part is ROHS3 compliant with a defined operating temperature range of -55°C to 250°C.

The 45F4R0E (Ohmite) offers the largest inventory availability at 1522 units and maintains RoHS compliance. Physical dimensions are larger at 8.70mm diameter. Operating temperature range is not specified in available documentation.

The ALSR054R000FE12 (Vishay Dale) provides an extended lower operating temperature limit of -65°C and includes moisture resistant features. This part is ROHS3 compliant with intermediate physical dimensions at 7.92mm diameter.

For applications requiring the smallest component size or current sensing functionality, the UB5C-4RF8 is the primary choice. For applications requiring extended low-temperature operation below -55°C, the ALSR054R000FE12 is suitable. The 45F4R0E serves as an alternative when supply constraints affect primary options.

Frequently Asked Questions (FAQ)

Q: Can the 45F4R0E be used as a direct replacement for the UB5C-4RF8?

A: Yes. Both parts share identical electrical specifications: 4 Ohms, ±1% tolerance, 5W power rating, wirewound composition, and ±50ppm/°C temperature coefficient. Physical dimensions differ, with the 45F4R0E being larger. Verify PCB layout clearance before substitution.

Q: What is the difference in physical size between these three parts?

A: The UB5C-4RF8 measures 6.40mm diameter x 12.70mm length. The ALSR054R000FE12 measures 7.92mm diameter x 22.23mm length. The 45F4R0E measures 8.70mm diameter x 23.80mm length. Larger dimensions may affect PCB routing and component spacing.

Q: Are all three parts RoHS compliant?

A: The UB5C-4RF8 and ALSR054R000FE12 are ROHS3 compliant. The 45F4R0E is RoHS compliant. Both compliance levels are acceptable for most applications; verify specific project requirements if ROHS3 certification is mandatory.

Q: Which substitute part has the widest operating temperature range?

A: The ALSR054R000FE12 specifies -65°C to 250°C, extending 10°C lower than the UB5C-4RF8 at -55°C to 250°C. The 45F4R0E does not provide an operating temperature range specification.

Q: Can these parts be used interchangeably in current sensing applications?

A: The UB5C-4RF8 is specifically documented for current sensing with flame proof and pulse withstanding features. The 45F4R0E and ALSR054R000FE12 are general-purpose wirewound resistors. While electrically equivalent, verify that application-specific requirements for current sensing performance are met by substitute parts.

Q: What is the moisture sensitivity level for all three parts?

A: All three parts have Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.