UB5C-2RF8 Equivalent & Substitute Parts

Part Overview

The UB5C-2RF8 is a 2 Ohm, ±1% tolerance, 5W axial wirewound resistor manufactured by Riedon in the UB series. This component is designed for through-hole applications requiring current sensing functionality with enhanced reliability features including flame proof, moisture resistant, pulse withstanding, and safety certifications. The part is currently in active production status with 941 pieces available in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required due to supply constraints, design flexibility, or application-specific packaging preferences.

Substiute Parts

UB5C-2RF8

RiedonIn Stock: 966UB5C-2RF8 Datasheet

Current PartRFQ

45F2R0E

OhmiteIn Stock: 208245F2R0E Datasheet

MFR RecommendedRFQ

ALSR052R000FE12

Vishay DaleIn Stock: 1407ALSR052R000FE12 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UB5C-2RF8 are qualified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Core Electrical Parameters (Must Match):

• Resistance value: 2 Ohms
• Tolerance: ±1%
• Power rating: 5W
• Composition: Wirewound
• Temperature coefficient: ±50ppm/°C

Mechanical Parameters (Must Match):

• Package type: Axial
• Number of terminations: 2
• Through-hole configuration

Compliance Parameters (Must Match or Exceed):

• RoHS3 compliance
• Operating temperature range compatibility

The identified substitute parts meet all core electrical and mechanical requirements. Variations in physical dimensions and packaging format (Bulk vs. Tape & Reel) do not affect electrical performance or circuit board integration for standard through-hole applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts meet the core electrical specifications for 2 Ohm, ±1%, 5W axial wirewound resistor applications. Selection between the UB5C-2RF8, 45F2R0E, and ALSR052R000FE12 should be based on the following factors:

UB5C-2RF8 (Riedon): Primary choice with specified operating temperature range of -55°C ~ 250°C, current sense functionality, and enhanced reliability features (flame proof, pulse withstanding, safety). ROHS3 compliant with defined moisture sensitivity level.

45F2R0E (Ohmite Ohmicone® 40 series): Functionally equivalent with matching electrical parameters. Operating temperature range not specified in available data. ROHS3 compliant. Suitable for applications where operating temperature specifications are not critical.

ALSR052R000FE12 (Vishay Dale ALSR series): Extended lower operating temperature limit of -65°C provides additional margin for cold environment applications. ROHS3 compliant with moisture resistant features. REACH status listed as vendor undefined, requiring clarification for regulated supply chain applications.

Physical dimension variations exist among the three parts. PCB layout and thermal management considerations may influence selection if space constraints are present.

Frequently Asked Questions (FAQ)

Q: Can the 45F2R0E directly replace the UB5C-2RF8 in all applications?

A: The 45F2R0E meets all core electrical specifications (2 Ohms, ±1%, 5W, ±50ppm/°C). However, the operating temperature range is not specified for the 45F2R0E. If your application operates within the UB5C-2RF8 range of -55°C ~ 250°C, substitution is electrically valid. Physical dimensions differ (0.343" Dia x 0.937" L vs. 0.250" Dia x 0.500" L), requiring PCB layout verification.

Q: What are the physical dimension differences, and do they matter?

A: The UB5C-2RF8 is the smallest (6.40mm x 12.70mm), the 45F2R0E is the largest (8.70mm x 23.80mm), and the ALSR052R000FE12 is intermediate (7.92mm x 22.23mm). For standard through-hole PCB designs with adequate spacing, these differences are typically accommodated. Verify PCB layout clearances and thermal dissipation paths if space is constrained.

Q: Are all three parts RoHS3 compliant?

A: Yes, all three parts are ROHS3 compliant. The UB5C-2RF8 and 45F2R0E have confirmed REACH Unaffected status. The ALSR052R000FE12 lists REACH status as vendor undefined; clarification from the supplier is recommended for regulated supply chain applications.

Q: Which substitute part is best for low-temperature applications?

A: The ALSR052R000FE12 specifies an operating temperature range of -65°C ~ 250°C, providing a 10°C lower minimum temperature limit compared to the UB5C-2RF8 (-55°C ~ 250°C). For applications requiring operation below -55°C, the ALSR052R000FE12 is the appropriate selection.

Q: Does packaging format (Tape & Reel vs. Bulk) affect electrical performance?

A: No. Packaging format affects only handling, storage, and assembly processes. The UB5C-2RF8 is supplied in Tape & Reel format, while the 45F2R0E and ALSR052R000FE12 are supplied in Bulk format. Electrical performance and circuit functionality are identical regardless of packaging.