UB3C-18RF1 Equivalent & Substitute Parts

Part Overview

The UB3C-18RF1 is an 18 Ohm ±1% 3W 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 Active status and ROHS3 compliant, making it suitable for modern electronic assemblies requiring reliable precision resistors in high-power applications.

Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the core parameters: resistance value, tolerance, power rating, composition type, and axial package format.

Substiute Parts

UB3C-18RF1

RiedonIn Stock: 1099UB3C-18RF1 Datasheet

Current PartRFQ

43F18RE

OhmiteIn Stock: 215743F18RE Datasheet

MFR RecommendedRFQ

RS02B18R00FE70

Vishay DaleIn Stock: 1677RS02B18R00FE70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Equivalent and substitute parts for the UB3C-18RF1 are qualified based on the following criteria:

• Resistance Value: Exact match at 18 Ohms
• Tolerance: ±1% precision grade
• Power Rating: 3W minimum
• Composition: Wirewound construction
• Package: Axial through-hole format
• Temperature Coefficient: ±20ppm/°C
• Compliance: ROHS3 compliant

The identified substitutes maintain these core electrical and mechanical parameters, ensuring functional equivalence in circuit applications. Physical dimensions may vary within acceptable assembly tolerances for axial components.

Parameter Comparison

Engineering Selection Recommendations

All three parts meet the core electrical requirements for 18 Ohm ±1% 3W wirewound axial resistor applications. Selection should be based on:

Compliance & Certification: All parts are ROHS3 compliant and carry EAR99 ECCN classification. The RS02B18R00FE70 includes REACH Unaffected status.

Product Status: All parts maintain Active status, ensuring continued availability and manufacturing support.

Physical Fit: The UB3C-18RF1 features the smallest physical footprint (4.00mm diameter × 8.90mm length). The 43F18RE and RS02B18R00FE70 are larger, which may impact PCB layout considerations. Verify board space constraints before selection.

Feature Set: The UB3C-18RF1 includes current sense, flame-proof, moisture-resistant, and pulse-withstanding features. The RS02B18R00FE70 specifies moisture resistance. The 43F18RE does not list additional features beyond standard wirewound construction.

Temperature Range: The RS02B18R00FE70 extends to -65°C minimum operating temperature, compared to -55°C for the UB3C-18RF1. The 43F18RE does not specify operating temperature limits.

Frequently Asked Questions (FAQ)

Q: Can the 43F18RE directly replace the UB3C-18RF1?

A: The 43F18RE matches all core electrical parameters (18 Ohms, ±1%, 3W, wirewound, axial). However, it is physically larger (5.60mm diameter × 15.10mm length versus 4.00mm × 8.90mm) and does not specify operating temperature range or additional protective features. Verify PCB layout compatibility and application temperature requirements before substitution.

Q: What is the difference between the RS02B18R00FE70 and UB3C-18RF1?

A: Both parts are electrically equivalent with identical resistance, tolerance, power rating, and temperature coefficient. The RS02B18R00FE70 offers a wider minimum operating temperature (-65°C versus -55°C) and explicitly specifies moisture resistance. Physical dimensions differ slightly (4.75mm diameter × 14.22mm length). Packaging differs: UB3C-18RF1 is supplied in Bulk; RS02B18R00FE70 is supplied in Cut Tape (CT).

Q: Are all substitutes suitable for current sensing applications?

A: The UB3C-18RF1 is specifically designated for current sensing with additional flame-proof and pulse-withstanding features. The 43F18RE and RS02B18R00FE70 are standard wirewound resistors without explicit current sensing designation. Verify application requirements and circuit protection needs before selecting alternatives.

Q: Do physical dimension differences affect circuit performance?

A: Physical dimensions do not affect electrical performance. However, larger components may impact PCB layout, thermal dissipation characteristics, and mechanical stress on solder joints. Verify board space and thermal management requirements for your specific application.

Q: Which substitute offers the best environmental protection?

A: The UB3C-18RF1 combines flame-proof, moisture-resistant, and pulse-withstanding features. The RS02B18R00FE70 specifies moisture resistance. The 43F18RE does not list environmental protection features. Select based on your application's environmental exposure and safety requirements.