UB5C-120RF8 Equivalent & Substitute Parts

Part Overview

The UB5C-120RF8 is a 120 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 1120 units in stock. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits alternative sourcing while maintaining electrical and mechanical compatibility.

Substiute Parts

UB5C-120RF8

RiedonIn Stock: 1132UB5C-120RF8 Datasheet

Current PartRFQ

45F120E

OhmiteIn Stock: 225945F120E Datasheet

MFR RecommendedRFQ

RS005120R0FE73

Vishay DaleIn Stock: 1474RS005120R0FE73 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UB5C-120RF8 is determined by strict equivalence across the following parameters: resistance value (120 Ohms), tolerance (±1%), power rating (5W), composition (wirewound), and package type (axial). All substitute parts must maintain these core electrical specifications and physical form factor to ensure direct compatibility in circuit applications.

The identified substitute parts—45F120E (Ohmite) and RS005120R0FE73 (Vishay Dale)—meet all mandatory substitution criteria. Both parts are wirewound axial resistors with 120 Ohm resistance, ±1% tolerance, and 5W power rating. Temperature coefficient specifications are identical at ±20ppm/°C. All parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment.

Physical dimensions vary slightly among the three parts due to different manufacturing designs, but all conform to standard axial package geometry suitable for through-hole PCB mounting. These dimensional differences do not affect electrical performance or circuit board layout compatibility for typical applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts—UB5C-120RF8, 45F120E, and RS005120R0FE73—are electrically and mechanically equivalent for 120 Ohm, 5W axial wirewound resistor applications. Selection among these parts is based on availability, packaging requirements, and supply chain considerations rather than performance differentiation.

The UB5C-120RF8 (Riedon) offers the most compact physical form factor at 6.40mm diameter and 12.70mm length, making it suitable for space-constrained layouts. This part is supplied in Tape & Reel format with 1120 units currently in stock.

The 45F120E (Ohmite, Ohmicone® 40 series) is available in bulk packaging with 2194 units in stock, providing higher inventory availability. This part has larger physical dimensions (8.70mm diameter x 23.80mm length) and does not specify an operating temperature range.

The RS005120R0FE73 (Vishay Dale, RS series) is supplied in Cut Tape format with 1419 units in stock. This part features an extended lower operating temperature limit of -65°C compared to the UB5C-120RF8 at -55°C, and includes moisture-resistant characteristics. Physical dimensions are intermediate at 7.92mm diameter x 22.23mm length.

All parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory requirements are met across all substitution options.

Frequently Asked Questions (FAQ)

Q: Can the 45F120E directly replace the UB5C-120RF8 in existing designs?

A: Yes. Both parts are 120 Ohm, ±1%, 5W wirewound axial resistors with identical temperature coefficients (±20ppm/°C) and equivalent electrical performance. Physical dimensions differ, but both conform to standard axial package geometry suitable for through-hole mounting. Packaging format differs (bulk vs. tape & reel), which may affect assembly processes but not circuit functionality.

Q: What are the dimensional differences among the three parts?

A: The UB5C-120RF8 measures 6.40mm diameter x 12.70mm length. The 45F120E measures 8.70mm diameter x 23.80mm length. The RS005120R0FE73 measures 7.92mm diameter x 22.23mm length. These variations reflect different manufacturing designs but do not affect electrical equivalence. PCB layout must accommodate the specific physical dimensions of the selected part.

Q: Are all three parts RoHS and REACH compliant?

A: Yes. All three parts—UB5C-120RF8, 45F120E, and RS005120R0FE73—are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component sourcing.

Q: Does the RS005120R0FE73 offer any performance advantages over the other parts?

A: The RS005120R0FE73 extends the lower operating temperature limit to -65°C compared to the UB5C-120RF8 at -55°C, providing broader temperature range coverage. This part also includes moisture-resistant characteristics. Electrical performance remains equivalent across all three parts for standard applications within the specified temperature ranges.

Q: What packaging formats are available for each part?

A: The UB5C-120RF8 is supplied in Tape & Reel (TR) format. The 45F120E is supplied in bulk packaging. The RS005120R0FE73 is supplied in Cut Tape (CT) format. Packaging selection depends on assembly equipment compatibility and procurement requirements.