UB5C-33RF8 Equivalent & Substitute Parts

Part Overview

The UB5C-33RF8 is a 33 Ohm, 1% tolerance, 5W 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, and pulse withstanding characteristics. The part is currently in active production status with 929 units available in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required due to supply constraints, design flexibility, or inventory optimization.

Substiute Parts

UB5C-33RF8

RiedonIn Stock: 965UB5C-33RF8 Datasheet

Current PartRFQ

45F33RE

OhmiteIn Stock: 185945F33RE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UB5C-33RF8 is determined by strict equivalence across the following critical parameters:

• Resistance value: 33 Ohms
• Tolerance: ±1%
• Power rating: 5W
• Composition: Wirewound
• Package: Axial through-hole
• Temperature coefficient: ±20ppm/°C
• Moisture sensitivity level: 1 (Unlimited)

The substitute part 45F33RE meets all mandatory electrical specifications. Physical dimensions may vary within acceptable limits for axial packages, as long as the component maintains mechanical compatibility with standard through-hole PCB layouts. Both parts maintain equivalent environmental compliance and reliability characteristics suitable for current sensing applications.

Parameter Comparison

Engineering Selection Recommendations

Both the UB5C-33RF8 and 45F33RE are active production components with equivalent electrical performance for 33 Ohm, 1% tolerance, 5W axial wirewound resistor applications. The UB5C-33RF8 features a more compact physical profile (6.40mm x 12.70mm) compared to the 45F33RE (8.70mm x 23.80mm), which may be relevant for space-constrained PCB layouts. The 45F33RE offers an extended upper operating temperature limit of 275°C versus 250°C for the UB5C-33RF8. Both components maintain full RoHS compliance and unlimited moisture sensitivity rating. Selection between these parts should be based on available inventory, PCB layout constraints, and specific thermal operating requirements.

Frequently Asked Questions (FAQ)

Q: Can the 45F33RE replace the UB5C-33RF8 in existing designs?

A: Yes. Both components share identical electrical specifications: 33 Ohms, ±1% tolerance, 5W power rating, ±20ppm/°C temperature coefficient, and axial through-hole package type. The primary consideration is physical dimension compatibility with the PCB layout, as the 45F33RE is larger (8.70mm x 23.80mm versus 6.40mm x 12.70mm).

Q: Are there any compliance differences between these parts?

A: Both parts are RoHS compliant and carry EAR99 ECCN classification. The UB5C-33RF8 is ROHS3 compliant, while the 45F33RE is RoHS compliant. Both maintain MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the temperature operating range difference?

A: The UB5C-33RF8 operates from -55°C to 250°C, while the 45F33RE extends to 275°C maximum. For applications requiring operation above 250°C, the 45F33RE is the appropriate selection.

Q: Are these parts suitable for current sensing applications?

A: The UB5C-33RF8 is specifically designed with current sensing functionality and includes flame proof, moisture resistant, and pulse withstanding features. The 45F33RE provides equivalent electrical performance for current sensing applications, though specific application-level features should be verified against circuit requirements.

Q: What packaging formats are available?

A: The UB5C-33RF8 is supplied in Tape & Reel (TR) packaging. The 45F33RE is supplied in Bulk packaging. Both are through-hole axial components suitable for standard PCB assembly processes.