UB5C-390RF8 Equivalent & Substitute Parts

Part Overview

The UB5C-390RF8 is a 390 Ohms ±1% 5W through-hole resistor in axial package manufactured by Riedon. This wirewound resistor is designed for current sense applications and features flame proof, moisture resistant, and pulse withstanding characteristics. The part is currently active in production with 873 pieces in stock. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers.

Substiute Parts

UB5C-390RF8

RiedonIn Stock: 969UB5C-390RF8 Datasheet

Current PartRFQ

45F390E

OhmiteIn Stock: 72145F390E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The 45F390E from Ohmite qualifies as a substitute for the UB5C-390RF8 based on the following critical parameters:

• Identical resistance value: 390 Ohms
• Matching tolerance: ±1%
• Equivalent power rating: 5W
• Same composition: Wirewound
• Identical package configuration: Axial
• Matching temperature coefficient: ±20ppm/°C
• Equivalent regulatory compliance: ROHS3 Compliant
• Same HTSUS classification: 8533.21.0080

Both parts meet the electrical and mechanical requirements for direct substitution in applications requiring a 390 Ohm 5W axial wirewound resistor.

Parameter Comparison

Engineering Selection Recommendations

Both the UB5C-390RF8 and 45F390E are active production parts with ROHS3 compliance and EAR99 export classification. Selection between these parts should be based on:

• Physical space constraints: The UB5C-390RF8 has a smaller diameter (6.40mm) and shorter length (12.70mm) compared to the 45F390E (8.70mm diameter, 23.80mm length). Applications with limited board space may require the Riedon part.
• Packaging requirements: The UB5C-390RF8 is supplied in Tape & Reel format, while the 45F390E is supplied in Bulk packaging. Procurement volume and assembly automation requirements should guide this selection.
• Feature set: The UB5C-390RF8 includes documented current sense, flame proof, moisture resistant, and pulse withstanding features. The 45F390E specifications do not document these features.

Frequently Asked Questions (FAQ)

Q: Can the 45F390E directly replace the UB5C-390RF8 in all applications?

A: Both parts meet the core electrical specifications (390 Ohms ±1%, 5W, ±20ppm/°C). However, physical dimensions differ. The 45F390E is larger in both diameter and length. Verify that board layout and component spacing accommodate the larger Ohmite part before substitution.

Q: What is the difference in packaging between these parts?

A: The UB5C-390RF8 is supplied in Tape & Reel (TR) format, suitable for automated assembly. The 45F390E is supplied in Bulk packaging. Select based on your assembly process and volume requirements.

Q: Are both parts RoHS compliant?

A: Yes, both the UB5C-390RF8 and 45F390E are ROHS3 Compliant and meet the same HTSUS classification (8533.21.0080).

Q: Does the 45F390E have the same safety features as the UB5C-390RF8?

A: The UB5C-390RF8 is documented as flame proof, moisture resistant, and pulse withstanding. The 45F390E specifications do not document these features. Confirm feature requirements for your application before substitution.

Q: What is the temperature coefficient specification for both parts?

A: Both parts have a temperature coefficient of ±20ppm/°C and operate across the same temperature range considerations. The UB5C-390RF8 specifies -55°C ~ 250°C operating temperature.