UB3C-33RF8 Equivalent & Substitute Parts

Part Overview

The UB3C-33RF8 is a 33 Ohm ±1% 3W axial wirewound resistor manufactured by Riedon. This component is designed for through-hole applications requiring current sensing with enhanced reliability features including flame proof, moisture resistant, pulse withstanding, and safety certifications. The part is currently in active production status with 769 units available in inventory. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers.

Substiute Parts

UB3C-33RF8

RiedonIn Stock: 861UB3C-33RF8 Datasheet

Current PartRFQ

WW3FT33R0

Stackpole Electronics IncIn Stock: 5865WW3FT33R0 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UB3C-33RF8 is permissible when the following parameters are maintained or exceeded:

Resistance value must be 33 Ohms with tolerance of ±1% or better. Power rating must be 3W or greater. Composition must be wirewound to maintain thermal and electrical stability characteristics. Package must be axial configuration to ensure mechanical fit in through-hole PCB layouts. Temperature coefficient must be ±20ppm/°C or better. Operating temperature range must encompass the application requirements. RoHS3 compliance and REACH unaffected status must be maintained. Moisture sensitivity level must be compatible with assembly and storage conditions.

The WW3FT33R0 manufactured by Stackpole Electronics Inc meets all substitution criteria with identical electrical specifications and enhanced operating temperature capability.

Parameter Comparison

Engineering Selection Recommendations

The WW3FT33R0 is electrically and functionally equivalent to the UB3C-33RF8 for applications requiring 33 Ohm ±1% 3W axial wirewound resistors. Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial applications.

The WW3FT33R0 provides extended operating temperature capability to 350°C compared to the UB3C-33RF8 maximum of 250°C, offering additional thermal margin for high-temperature environments.

Physical dimension differences must be evaluated for PCB layout compatibility. The WW3FT33R0 has larger diameter (0.187" vs 0.157") and length (0.560" vs 0.350"), requiring verification of available board space and component clearances.

Packaging format differs between the original part (Tape & Reel) and substitute (Cut Tape), which may impact assembly line integration and inventory management procedures.

Frequently Asked Questions (FAQ)

Q: Can WW3FT33R0 be used as a direct replacement for UB3C-33RF8?

A: Electrical substitution is valid when resistance, tolerance, power rating, and temperature coefficient specifications are identical. Physical dimensions and packaging format must be verified for mechanical compatibility with the specific PCB layout and assembly process.

Q: What are the critical parameters for substitution?

A: Resistance value (33 Ohms), tolerance (±1%), power rating (3W), composition (wirewound), and axial package type are the primary substitution criteria. Operating temperature range and regulatory compliance (RoHS3, REACH) must also be maintained.

Q: Does the larger physical size of WW3FT33R0 affect electrical performance?

A: Physical dimensions do not alter electrical characteristics. Size differences impact only PCB layout compatibility and mechanical fit within the assembly.

Q: Are there packaging considerations when switching from Tape & Reel to Cut Tape?

A: Yes. Tape & Reel packaging is optimized for automated assembly lines, while Cut Tape is suitable for manual or semi-automated processes. Assembly equipment compatibility must be confirmed before implementation.

Q: Is the extended temperature range of WW3FT33R0 beneficial?

A: The WW3FT33R0 operating range of -55°C to 350°C exceeds the UB3C-33RF8 range of -55°C to 250°C. This provides additional thermal margin for applications approaching the upper temperature limit of the original specification.