UB3C-40RF8 Equivalent & Substitute Parts

Part Overview

The UB3C-40RF8 is a 40 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, pulse withstanding, and safety certifications. The part is currently active in production with 874 units in stock. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers.

Substiute Parts

UB3C-40RF8

RiedonIn Stock: 955UB3C-40RF8 Datasheet

Current PartRFQ

43F40RE

OhmiteIn Stock: 568643F40RE Datasheet

MFR RecommendedRFQ

RS02B40R00FE70

Vishay DaleIn Stock: 3356RS02B40R00FE70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UB3C-40RF8 is determined by the following criteria:

Resistance value and tolerance must match exactly: 40 Ohms ±1%

Power rating must be equal or greater: 3W minimum

Composition must be wirewound to maintain electrical characteristics

Package type must be axial for mechanical compatibility with PCB layouts

Temperature coefficient must be ±20ppm/°C or better

Operating temperature range must encompass or exceed -55°C ~ 250°C

RoHS3 compliance and REACH unaffected status must be maintained

Both identified substitute parts meet these criteria and are qualified for direct replacement in applications requiring the UB3C-40RF8.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain full electrical equivalence to the UB3C-40RF8 across all critical parameters: resistance, tolerance, power rating, temperature coefficient, and composition. All three parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

The RS02B40R00FE70 (Vishay Dale) provides an extended lower operating temperature limit of -65°C compared to the UB3C-40RF8 specification of -55°C, offering broader thermal coverage. The 43F40RE (Ohmite) maintains the specified temperature coefficient and power rating but does not document an operating temperature range.

Physical dimensions vary across the three parts. The UB3C-40RF8 has the smallest footprint at 4.00mm diameter. The RS02B40R00FE70 measures 4.75mm diameter, and the 43F40RE measures 5.60mm diameter. PCB layout constraints may influence selection based on available board space.

Frequently Asked Questions (FAQ)

Q: Can the 43F40RE or RS02B40R00FE70 be used as direct replacements for the UB3C-40RF8?

A: Yes. Both parts meet the electrical specifications of 40 Ohms ±1% at 3W with ±20ppm/°C temperature coefficient and wirewound axial construction. All three parts are ROHS3 compliant and REACH unaffected.

Q: What are the physical dimension differences between these parts?

A: The UB3C-40RF8 measures 4.00mm diameter x 8.90mm length. The RS02B40R00FE70 measures 4.75mm diameter x 14.22mm length. The 43F40RE measures 5.60mm diameter x 15.10mm length. Larger physical dimensions may affect PCB layout compatibility.

Q: Are there operating temperature range differences?

A: The UB3C-40RF8 operates from -55°C to 250°C. The RS02B40R00FE70 extends the lower limit to -65°C. The 43F40RE does not specify an operating temperature range in available documentation.

Q: Do all parts meet the same regulatory standards?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting current environmental and safety regulations.

Q: What packaging formats are available?

A: The UB3C-40RF8 is supplied in Tape & Reel format. The 43F40RE is supplied in Bulk packaging. The RS02B40R00FE70 is supplied in Cut Tape format. Packaging selection depends on assembly process requirements.