UB3C-75RF8 Equivalent & Substitute Parts

Part Overview

The UB3C-75RF8 is a 75 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 characteristics. The part is Active in product status with 672 units in current inventory stock. Equivalent and substitute parts are identified when component availability changes, supply chain disruptions occur, or design flexibility is required while maintaining electrical and mechanical compatibility.

Substiute Parts

UB3C-75RF8

RiedonIn Stock: 724UB3C-75RF8 Datasheet

Current PartRFQ

43F75RE

OhmiteIn Stock: 79643F75RE Datasheet

MFR RecommendedRFQ

RS02B75R00FE70

Vishay DaleIn Stock: 1815RS02B75R00FE70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UB3C-75RF8 is determined by strict alignment of the following electrical and mechanical parameters:

• Resistance value: 75 Ohms
• Tolerance: ±1%
• Power rating: 3W
• Composition: Wirewound
• Package configuration: Axial through-hole
• Temperature coefficient: ±20ppm/°C
• Number of terminations: 2

All identified substitute parts meet these core requirements. Physical dimensions may vary within the axial package category. Operating temperature ranges and feature sets may differ; however, minimum operating temperature and maximum temperature specifications must not be lower than the application requirements. RoHS and REACH compliance status are provided for regulatory assessment.

Parameter Comparison

Engineering Selection Recommendations

All three parts are Active in product status and meet the core electrical specifications of 75 Ohms ±1% at 3W with wirewound axial configuration.

The 43F75RE (Ohmite) provides an extended upper operating temperature limit of 275°C compared to the UB3C-75RF8 at 250°C. This part is RoHS Compliant and carries MSL 1 rating. Physical dimensions are larger (0.220" diameter x 0.594" length).

The RS02B75R00FE70 (Vishay Dale) extends the lower operating temperature to -65°C and maintains the 250°C upper limit. This part is ROHS3 Compliant and REACH Unaffected. Physical dimensions are intermediate (0.187" diameter x 0.560" length). MSL status is Not Applicable.

Selection between substitutes depends on PCB layout constraints, thermal environment requirements, and regulatory compliance documentation needs. All parts satisfy the core electrical and mechanical substitution criteria.

Frequently Asked Questions (FAQ)

Q: Can the 43F75RE replace the UB3C-75RF8 in all applications?

A: The 43F75RE meets all core electrical parameters (75 Ohms ±1%, 3W, wirewound, axial). Physical dimensions differ; verify PCB layout clearance. The extended temperature range to 275°C provides additional thermal margin. RoHS compliance status differs; confirm regulatory requirements.

Q: What is the primary difference between the RS02B75R00FE70 and the UB3C-75RF8?

A: Both parts share identical electrical specifications. The RS02B75R00FE70 extends the lower operating temperature to -65°C. Physical dimensions are slightly larger. MSL classification differs. REACH status is explicitly Unaffected versus the main part.

Q: Are physical dimension differences critical for substitution?

A: Physical dimensions must be evaluated against PCB layout constraints, mounting clearances, and thermal dissipation requirements. Larger packages may require design verification. Smaller packages may offer space advantages but must not compromise thermal performance.

Q: Do all substitute parts carry the same feature set as the UB3C-75RF8?

A: The UB3C-75RF8 specifies Current Sense, Flame Proof, Moisture Resistant, Pulse Withstanding, and Safety features. The 43F75RE does not list specific features. The RS02B75R00FE70 specifies Moisture Resistant. Feature alignment should be confirmed against application requirements.

Q: Which part has the best regulatory compliance profile?

A: The UB3C-75RF8 and RS02B75R00FE70 are both ROHS3 Compliant and REACH Unaffected. The 43F75RE is RoHS Compliant with Vendor Undefined REACH status. Regulatory requirements vary by application and market; confirm compliance documentation with your quality and compliance team.