UB3C-20RF8 Equivalent & Substitute Parts

Part Overview

The UB3C-20RF8 is a 20 Ohm ±1% 3W 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 Active status and ROHS3 compliant. Substitute parts are necessary to address supply chain flexibility, packaging preferences, or inventory availability while maintaining electrical and mechanical compatibility.

Substiute Parts

UB3C-20RF8

RiedonIn Stock: 766UB3C-20RF8 Datasheet

Current PartRFQ

RS02B20R00FE70

Vishay DaleIn Stock: 2176RS02B20R00FE70 Datasheet

MFR RecommendedRFQ

WW3FT20R0

Stackpole Electronics IncIn Stock: 2969WW3FT20R0 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UB3C-20RF8 is determined by strict equivalence across the following critical parameters:

• Resistance value: 20 Ohms
• Tolerance: ±1%
• Power rating: 3W
• Composition: Wirewound
• Package: Axial through-hole
• Temperature coefficient: ±20ppm/°C
• RoHS compliance: ROHS3 Compliant
• Number of terminations: 2

The two qualified substitute parts (RS02B20R00FE70 and WW3FT20R0) meet all electrical specifications and mechanical compatibility requirements. Variations in physical dimensions, operating temperature range extensions, and packaging format (Cut Tape vs. Tape & Reel) do not affect functional substitutability for this application category.

Parameter Comparison

Engineering Selection Recommendations

All three parts—UB3C-20RF8, RS02B20R00FE70, and WW3FT20R0—are Active status components with ROHS3 compliance and REACH unaffected status, making them suitable for equivalent substitution in applications requiring 20 Ohm 3W axial wirewound resistors.

Selection between these parts may be based on:

• Packaging format availability: UB3C-20RF8 is supplied in Tape & Reel; RS02B20R00FE70 and WW3FT20R0 are supplied in Cut Tape
• Operating temperature range requirements: WW3FT20R0 extends to 350°C; RS02B20R00FE70 extends to -65°C minimum
• Physical dimensions: RS02B20R00FE70 and WW3FT20R0 share identical dimensions (0.187" Dia x 0.560" L); UB3C-20RF8 differs (0.157" Dia x 0.350" L)
• Inventory availability and lead time considerations

Frequently Asked Questions (FAQ)

Q: Can RS02B20R00FE70 directly replace UB3C-20RF8 in my circuit?

A: Yes. Both parts meet identical electrical specifications (20 Ohms ±1%, 3W, ±20ppm/°C, ROHS3 compliant). Physical dimension differences do not affect electrical performance. Verify PCB layout accommodates the larger axial body (0.187" Dia x 0.560" L vs. 0.157" Dia x 0.350" L).

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Tape & Reel (TR) packaging is used for automated assembly processes. Cut Tape (CT) packaging is used for manual or semi-automated assembly. Both contain identical components; packaging format selection depends on assembly method and volume requirements.

Q: Are there any temperature range limitations when substituting WW3FT20R0?

A: WW3FT20R0 operates from -55°C to 350°C, which exceeds the original UB3C-20RF8 range (-55°C to 250°C). This extended range does not create compatibility issues; it provides additional operational margin for high-temperature applications.

Q: Do all substitute parts have the same moisture resistance rating?

A: UB3C-20RF8 specifies moisture resistant as a feature. RS02B20R00FE70 and WW3FT20R0 also specify moisture resistant. All three parts are suitable for moisture-sensitive environments.

Q: Can I use these parts interchangeably in production?

A: Yes, provided your PCB layout accommodates the physical dimensions of the selected substitute. Verify lead spacing and body diameter clearances before implementation. All parts share identical electrical characteristics and compliance certifications.