UB5C-39RF8 Equivalent & Substitute Parts

Part Overview

The UB5C-39RF8 is a 39 Ohm, 1% tolerance, 5W axial wirewound resistor manufactured by Riedon. This through-hole 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 1039 units in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same resistance value, tolerance, power rating, and package type.

Substiute Parts

UB5C-39RF8

RiedonIn Stock: 1111UB5C-39RF8 Datasheet

Current PartRFQ

45F39RE

OhmiteIn Stock: 121145F39RE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The 45F39RE from Ohmite qualifies as a direct substitute for the UB5C-39RF8 based on the following critical parameters:

• Resistance value: 39 Ohms (identical)
• Tolerance: ±1% (identical)
• Power rating: 5W (identical)
• Composition: Wirewound (identical)
• Package: Axial (identical)
• Temperature coefficient: ±20ppm/°C (identical)
• Termination count: 2 (identical)

Both parts maintain the same electrical performance characteristics and physical form factor required for through-hole axial mounting applications.

Parameter Comparison

Engineering Selection Recommendations

The 45F39RE is electrically equivalent to the UB5C-39RF8 across all critical performance parameters. Both parts are active products with RoHS compliance and unlimited moisture sensitivity ratings. The primary consideration for selection is physical dimensions: the Ohmite 45F39RE is larger (0.343" diameter × 0.937" length versus 0.250" diameter × 0.500" length), which may affect board layout and thermal management in space-constrained applications. The Ohmite part offers a wider operating temperature range (-55°C to 275°C versus -55°C to 250°C), providing additional thermal margin in high-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can the 45F39RE replace the UB5C-39RF8 in all applications?

A: The 45F39RE is electrically equivalent and maintains identical resistance, tolerance, power rating, and temperature coefficient specifications. Physical dimensions differ; verify that the larger package size (0.343" Dia × 0.937" L) accommodates your board layout and thermal requirements.

Q: What are the key differences between these parts?

A: The primary differences are physical dimensions and maximum operating temperature. The Ohmite 45F39RE is physically larger and rated to 275°C versus 250°C for the Riedon UB5C-39RF8. Electrical performance is identical.

Q: Are both parts RoHS compliant?

A: Yes. The UB5C-39RF8 is ROHS3 Compliant, and the 45F39RE is RoHS Compliant. Both meet regulatory requirements for lead-free manufacturing.

Q: What is the moisture sensitivity rating for these parts?

A: Both parts carry MSL 1 (Unlimited), indicating no moisture sensitivity concerns for storage and handling.

Q: How do the packaging options differ?

A: The UB5C-39RF8 is supplied in Tape & Reel (TR) packaging, while the 45F39RE is supplied in Bulk packaging. Select based on your procurement and assembly requirements.