UB3C-390RF8 Equivalent & Substitute Parts

Part Overview

The UB3C-390RF8 is a 390 Ohms ±1% 3W 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, pulse withstanding, and safety certifications. The part is currently active in production and available in tape and reel packaging. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and compliance certifications align with the original component requirements.

Substiute Parts

UB3C-390RF8

RiedonIn Stock: 944UB3C-390RF8 Datasheet

Current PartRFQ

RS02B390R0FE70

Vishay DaleIn Stock: 2652RS02B390R0FE70 Datasheet

MFR RecommendedRFQ

WW3FT390R

Stackpole Electronics IncIn Stock: 2853WW3FT390R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UB3C-390RF8 are qualified based on the following critical parameters:

Resistance value of 390 Ohms with ±1% tolerance ensures electrical equivalence in circuit applications. Power rating of 3W maintains thermal performance requirements. Wirewound composition and axial package type ensure mechanical and thermal compatibility with the original design. Temperature coefficient of ±20ppm/°C and operating temperature range support equivalent performance across specified environmental conditions. RoHS3 compliance and REACH unaffected status confirm regulatory alignment. All substitute candidates must match these parameters to ensure direct functional replacement without circuit redesign.

Parameter Comparison

Engineering Selection Recommendations

Both RS02B390R0FE70 and WW3FT390R meet the core electrical and mechanical requirements for substitution with UB3C-390RF8. All three parts are active products with ROHS3 compliance and REACH unaffected status, confirming regulatory alignment for current applications.

RS02B390R0FE70 (Vishay Dale) operates across -65°C to 250°C, providing extended low-temperature performance compared to the original specification of -55°C to 250°C. This part is suitable for applications requiring enhanced cold-temperature reliability.

WW3FT390R (Stackpole Electronics Inc) operates across -55°C to 350°C, providing extended high-temperature performance beyond the original specification of -55°C to 250°C. This part is suitable for applications requiring enhanced thermal performance in elevated temperature environments.

Selection between substitutes depends on the specific operating temperature requirements of the application. When operating temperature range does not exceed -55°C to 250°C, either substitute provides equivalent performance. When extended temperature range is required, choose the substitute that matches the application's thermal envelope.

Frequently Asked Questions (FAQ)

Q: Can RS02B390R0FE70 replace UB3C-390RF8 in all applications?

A: RS02B390R0FE70 provides electrical and mechanical equivalence with UB3C-390RF8 across the common operating temperature range of -55°C to 250°C. The extended low-temperature capability of RS02B390R0FE70 (-65°C minimum) does not affect compatibility in applications operating within the original specification range.

Q: Can WW3FT390R replace UB3C-390RF8 in all applications?

A: WW3FT390R provides electrical and mechanical equivalence with UB3C-390RF8 across the common operating temperature range of -55°C to 250°C. The extended high-temperature capability of WW3FT390R (350°C maximum) does not affect compatibility in applications operating within the original specification range.

Q: Are there physical size differences between these parts?

A: UB3C-390RF8 has a diameter of 0.157" and length of 0.350" (4.00mm x 8.90mm). Both RS02B390R0FE70 and WW3FT390R have a diameter of 0.187" and length of 0.560" (4.75mm x 14.22mm). Physical size differences must be evaluated for PCB layout compatibility and mechanical clearance in the target application.

Q: Do all three parts have identical moisture resistance?

A: UB3C-390RF8 includes moisture resistant as a specified feature. RS02B390R0FE70 and WW3FT390R both specify moisture resistant composition. All three parts are suitable for applications requiring moisture protection.

Q: What packaging differences exist between these parts?

A: UB3C-390RF8 is supplied in tape and reel (TR) packaging. RS02B390R0FE70 and WW3FT390R are supplied in cut tape (CT) packaging. Packaging format affects handling and assembly processes but does not impact electrical or mechanical performance.