UB3C-39RF8 Equivalent & Substitute Parts

Part Overview

The UB3C-39RF8 is a 39 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 currently active in production with 817 units in stock. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and compliance certifications align with the original component requirements.

Substiute Parts

UB3C-39RF8

RiedonIn Stock: 919UB3C-39RF8 Datasheet

Current PartRFQ

43F39RE

OhmiteIn Stock: 77443F39RE Datasheet

MFR RecommendedRFQ

RS02B39R00FE70

Vishay DaleIn Stock: 2322RS02B39R00FE70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UB3C-39RF8 are qualified based on the following criteria:

Electrical equivalence: Resistance value of 39 Ohms with ±1% tolerance and 3W power rating Composition: Wirewound construction Package compatibility: Axial through-hole form factor with 2 terminations Temperature stability: Temperature coefficient of ±20ppm/°C Operating temperature range: Minimum -55°C lower bound and 250°C upper bound Regulatory compliance: RoHS3 compliance and REACH unaffected status

The substitute parts 43F39RE and RS02B39R00FE70 meet all electrical and mechanical criteria. Physical dimensions vary within acceptable tolerances for axial resistor form factors. Both substitutes maintain the same functional performance for current sensing applications.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain full electrical and mechanical compatibility with the UB3C-39RF8. Selection between substitutes depends on specific application requirements and supply chain considerations.

The 43F39RE (Ohmite) extends the upper operating temperature to 275°C, providing additional thermal margin beyond the original specification. This part carries RoHS compliance certification. The 43F39RE is available in bulk packaging.

The RS02B39R00FE70 (Vishay Dale) extends the lower operating temperature to -65°C, providing enhanced cold-temperature performance. This part maintains ROHS3 compliance and REACH unaffected status, matching the original certification profile. The RS02B39R00FE70 is available in cut tape packaging with the highest inventory level at 2296 units.

All three parts are active products with current manufacturing status and equivalent regulatory standing for industrial applications.

Frequently Asked Questions (FAQ)

Q: Can the 43F39RE replace the UB3C-39RF8 in all applications? A: Yes. Both parts share identical electrical specifications (39 Ohms ±1%, 3W, ±20ppm/°C) and axial wirewound construction. The 43F39RE operates to 275°C versus 250°C for the original, providing additional thermal capability. Physical dimensions differ slightly but remain compatible with standard axial resistor footprints.

Q: What is the difference between the RS02B39R00FE70 and the original UB3C-39RF8? A: The RS02B39R00FE70 maintains identical electrical performance and operating temperature upper limit (250°C). It extends the lower operating temperature to -65°C compared to -55°C for the original. Both are ROHS3 compliant and REACH unaffected. The RS02B39R00FE70 features moisture-resistant construction and is supplied in cut tape packaging.

Q: Are there packaging differences between these parts? A: Yes. The UB3C-39RF8 is supplied in tape and reel packaging. The 43F39RE is supplied in bulk packaging. The RS02B39R00FE70 is supplied in cut tape packaging. All three maintain the same axial through-hole form factor and are compatible with standard PCB assembly processes.

Q: Do all three parts meet the same compliance standards? A: The UB3C-39RF8 and RS02B39R00FE70 are both ROHS3 compliant and REACH unaffected. The 43F39RE is RoHS compliant with vendor-undefined REACH status. For applications requiring specific regulatory certifications, verify compliance requirements against the 43F39RE documentation.

Q: Which substitute offers the best inventory availability? A: The RS02B39R00FE70 has the highest inventory at 2296 units in stock, followed by the UB3C-39RF8 at 817 units, and the 43F39RE at 762 units.