UB3C-25RF8 Equivalent & Substitute Parts

Part Overview

The UB3C-25RF8 is a 25 Ohm ±1% 3W axial wirewound resistor manufactured by Riedon. This through-hole component is designed for current sense applications and features flame proof, moisture resistant, pulse withstanding, and safety certifications. The part is currently active in production with 684 units in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required for design flexibility, supply chain continuity, or inventory optimization.

Substiute Parts

UB3C-25RF8

RiedonIn Stock: 771UB3C-25RF8 Datasheet

Current PartRFQ

RS02B25R00FE70

Vishay DaleIn Stock: 4695RS02B25R00FE70 Datasheet

MFR RecommendedRFQ

WW3FT25R0

Stackpole Electronics IncIn Stock: 7468WW3FT25R0 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UB3C-25RF8 are qualified based on the following criteria:

• Resistance value: 25 Ohms
• Tolerance: ±1%
• Power rating: 3W
• Composition: Wirewound
• Package: Axial through-hole
• Temperature coefficient: ±20ppm/°C
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected

The identified substitutes maintain electrical equivalence across all critical parameters. Physical dimensions may vary within the axial package category, but all parts are compatible with standard through-hole PCB layouts. All substitute parts are active products with confirmed inventory availability.

Parameter Comparison

Engineering Selection Recommendations

All three parts meet the core electrical requirements for 25 Ohm ±1% 3W wirewound axial resistor applications. Selection between the UB3C-25RF8 and its substitutes should be based on:

• Inventory availability and lead time requirements
• Physical space constraints on the PCB, noting that RS02B25R00FE70 and WW3FT25R0 have larger physical dimensions (0.187" Dia x 0.560" L) compared to the UB3C-25RF8 (0.157" Dia x 0.350" L)
• Operating temperature range requirements: WW3FT25R0 supports extended upper temperature to 350°C, while UB3C-25RF8 and RS02B25R00FE70 are rated to 250°C
• All parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for current applications

Frequently Asked Questions (FAQ)

Q: Can RS02B25R00FE70 or WW3FT25R0 be used as direct replacements for UB3C-25RF8?

A: Yes, both parts are electrically equivalent with matching resistance, tolerance, power rating, and temperature coefficient. However, physical dimensions differ. The substitute parts are larger (0.187" Dia x 0.560" L versus 0.157" Dia x 0.350" L), which may affect PCB layout compatibility depending on available space.

Q: What are the key differences between the three parts?

A: The primary differences are physical dimensions and maximum operating temperature. WW3FT25R0 offers the highest temperature rating at 350°C. RS02B25R00FE70 has the lowest minimum operating temperature at -65°C. All three maintain identical electrical specifications for resistance, tolerance, power rating, and temperature coefficient.

Q: Are all three parts compliant with current regulatory standards?

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

Q: Does packaging format affect substitution?

A: The main part is supplied in Tape & Reel (TR) format, while both substitutes are supplied in Cut Tape (CT) format. This affects handling and assembly processes but does not impact electrical or mechanical compatibility in the final application.

Q: Which substitute should I choose for high-temperature applications?

A: WW3FT25R0 is rated to 350°C maximum operating temperature, making it suitable for applications requiring extended temperature performance beyond the 250°C rating of UB3C-25RF8 and RS02B25R00FE70.