UB5C-390RF1 Equivalent & Substitute Parts

Part Overview

The UB5C-390RF1 is a 390 Ohms ±1% 5W through-hole axial wirewound resistor manufactured by Riedon. This component is designed for current sensing applications and features flame-proof, moisture-resistant, and pulse-withstanding characteristics. The part is currently active in production with 1131 pieces in stock. Substitute parts may be required due to supply constraints, lead time considerations, or inventory availability across different distribution channels.

Substiute Parts

UB5C-390RF1

RiedonIn Stock: 1159UB5C-390RF1 Datasheet

Current PartRFQ

45F390E

OhmiteIn Stock: 72145F390E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UB5C-390RF1 is determined by the following critical parameters:

• Resistance value: 390 Ohms
• Tolerance: ±1%
• Power rating: 5W
• Composition: Wirewound
• Package: Axial
• Temperature coefficient: ±20ppm/°C
• RoHS compliance: ROHS3 Compliant

The substitute part 45F390E meets all core electrical and mechanical requirements. Both components share identical resistance, tolerance, power rating, composition, and package configuration. Both are ROHS3 compliant and operate within compatible temperature coefficient specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the UB5C-390RF1 and 45F390E are active production components with ROHS3 compliance and EAR99 export classification. Selection between these parts should be based on:

Physical dimensions: The UB5C-390RF1 is more compact (6.40mm x 12.70mm) compared to the 45F390E (8.70mm x 23.80mm). PCB layout constraints may dictate which component is suitable for your application.

Availability: The UB5C-390RF1 has 1131 pieces in stock, while the 45F390E has 620 pieces available. Supply chain requirements should inform part selection.

Manufacturer series: The UB5C-390RF1 belongs to the Riedon UB series, while the 45F390E is part of the Ohmite Ohmicone® 40 series. Both series are established wirewound resistor lines with equivalent electrical performance.

Frequently Asked Questions (FAQ)

Q: Can the 45F390E directly replace the UB5C-390RF1 in my circuit?

A: Yes, from an electrical standpoint. Both components have identical resistance (390 Ohms), tolerance (±1%), power rating (5W), and temperature coefficient (±20ppm/°C). However, physical dimensions differ. The 45F390E is larger and may require PCB layout modifications if space is constrained.

Q: What is the difference in physical size between these parts?

A: The UB5C-390RF1 measures 0.250" diameter x 0.500" length (6.40mm x 12.70mm). The 45F390E measures 0.343" diameter x 0.937" length (8.70mm x 23.80mm). The Ohmite part is approximately 37% larger in diameter and 87% longer.

Q: Are both parts RoHS compliant?

A: Yes. Both the UB5C-390RF1 and 45F390E are ROHS3 compliant and carry EAR99 export classification.

Q: What does the ±1% tolerance mean for these resistors?

A: The actual resistance value will be within ±1% of the nominal 390 Ohm specification. This means the measured resistance will fall between 385.9 Ohms and 394.1 Ohms.

Q: Can I use these parts in high-temperature applications?

A: The UB5C-390RF1 operates from -55°C to 250°C. Operating temperature range for the 45F390E was not provided in the specification data. Verify the 45F390E temperature range with the manufacturer before selecting it for extreme temperature applications.

Q: What is the significance of the ±20ppm/°C temperature coefficient?

A: This specification indicates how much the resistance value changes with temperature. A ±20ppm/°C coefficient means the resistance will change by approximately ±0.002% per degree Celsius change in operating temperature.