UB3C-50RF8 Equivalent & Substitute Parts

Part Overview

The UB3C-50RF8 is a 50 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 currently active in production with 793 pieces in stock. Substitute parts are necessary to address supply chain flexibility, alternative packaging formats, or inventory availability across different manufacturers while maintaining equivalent electrical and mechanical performance.

Substiute Parts

UB3C-50RF8

RiedonIn Stock: 831UB3C-50RF8 Datasheet

Current PartRFQ

RS02B50R00FE70

Vishay DaleIn Stock: 3721RS02B50R00FE70 Datasheet

MFR RecommendedRFQ

WW3FT50R0

Stackpole Electronics IncIn Stock: 4523WW3FT50R0 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UB3C-50RF8 are qualified based on the following critical parameters that determine functional equivalence:

Electrical Parameters (Must Match):

• Resistance value: 50 Ohms
• Tolerance: ±1%
• Power rating: 3W
• Temperature coefficient: ±20ppm/°C
• Composition: Wirewound

Mechanical Parameters (Must Match):

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

Compliance Parameters (Must Match):

• RoHS3 Compliant status
• REACH Unaffected status

The substitute parts RS02B50R00FE70 (Vishay Dale) and WW3FT50R0 (Stackpole Electronics Inc) meet all critical electrical and mechanical requirements. Physical dimensions vary within acceptable tolerances for axial through-hole mounting. Both substitutes maintain equivalent performance characteristics for current sensing applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts—UB3C-50RF8, RS02B50R00FE70, and WW3FT50R0—are active production components with full RoHS3 and REACH compliance. Selection between these equivalents should be based on:

Supply Chain Availability: The UB3C-50RF8 has 793 units in stock. The RS02B50R00FE70 (Vishay Dale) offers 3674 units, and the WW3FT50R0 (Stackpole) provides 4460 units, allowing flexibility in procurement strategy.

Operating Temperature Envelope: The WW3FT50R0 extends the upper operating temperature to 350°C compared to 250°C for both the UB3C-50RF8 and RS02B50R00FE70. The RS02B50R00FE70 extends the lower operating temperature to -65°C compared to -55°C for the other two parts. Design requirements should determine if these extended ranges are necessary.

Physical Dimensions: The UB3C-50RF8 features a more compact axial package (0.157" Dia x 0.350" L) compared to the larger form factors of both substitute parts (0.187" Dia x 0.560" L). PCB layout constraints may influence selection.

Packaging Format: The UB3C-50RF8 is supplied in Tape & Reel format, while both substitutes are supplied in Cut Tape format. Manufacturing and assembly processes should determine the preferred packaging configuration.

Frequently Asked Questions (FAQ)

Q: Can RS02B50R00FE70 or WW3FT50R0 be used as direct replacements for UB3C-50RF8 in existing designs?

A: Yes, both parts are electrically and mechanically equivalent for current sensing applications. All three components share identical resistance (50 Ohms), tolerance (±1%), power rating (3W), temperature coefficient (±20ppm/°C), and axial through-hole configuration. Physical dimensions differ, but both substitutes are compatible with standard through-hole PCB layouts.

Q: What are the key differences between the substitute parts?

A: RS02B50R00FE70 (Vishay Dale) and WW3FT50R0 (Stackpole) are electrically identical to the UB3C-50RF8. The primary differences are operating temperature ranges (RS02B50R00FE70 extends to -65°C; WW3FT50R0 extends to 350°C), physical dimensions, and packaging format (Cut Tape vs. Tape & Reel).

Q: Are there any compliance or certification differences between these parts?

A: No. All three parts are ROHS3 Compliant and REACH Unaffected, meeting identical regulatory requirements for electronic component applications.

Q: Does the physical size difference affect circuit performance?

A: Physical dimensions do not affect electrical performance. Size differences may impact PCB layout and thermal dissipation characteristics. The more compact UB3C-50RF8 may be preferred for space-constrained designs, while the larger substitute parts may offer improved thermal characteristics in high-power applications.

Q: Which part should be selected for new designs?

A: Selection should be based on supply chain availability, operating temperature requirements, PCB layout constraints, and preferred packaging format. All three parts deliver equivalent electrical performance for 50 Ohm ±1% 3W current sensing applications.