UAL50-75RF8 Equivalent & Substitute Parts

Part Overview

The UAL50-75RF8 is a 75 Ohms ±1% 50W wirewound chassis mount resistor manufactured by Riedon in the UAL series. This component is designed for current sensing applications requiring high power dissipation and precision tolerance in industrial and electronic equipment. The part is Active status and widely used in power management circuits, load banks, and measurement systems. Substitute parts are identified to provide design flexibility, supply chain alternatives, and inventory optimization while maintaining electrical and mechanical compatibility.

Substiute Parts

UAL50-75RF8

RiedonIn Stock: 910UAL50-75RF8 Datasheet

Current PartRFQ

850F75RE

OhmiteIn Stock: 1052850F75RE Datasheet

DirectRFQ

TMC05075R00FE02

Vishay DaleIn Stock: 1267TMC05075R00FE02 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UAL50-75RF8 are qualified based on the following critical parameters that determine functional and mechanical interchangeability:

• Resistance value: 75 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 50W (exact match required)
• Composition: Wirewound (exact match required)
• Temperature coefficient: ±20ppm/°C (exact match required)
• Housing type: Aluminum (exact match required)
• Mounting feature: Flanges (exact match required)
• Lead style: Solder Lugs (exact match required)
• Package type: Axial, Box (exact match required)
• RoHS compliance: ROHS3 Compliant (regulatory requirement)

The identified substitutes meet all critical electrical specifications and mechanical form factors. Dimensional variations within manufacturing tolerances and operating temperature range differences do not affect circuit performance in standard applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts—UAL50-75RF8 (Riedon), 850F75RE (Ohmite), and TMC05075R00FE02 (Vishay Dale)—are Active status products with ROHS3 compliance and REACH Unaffected or Vendor Undefined status. Selection between these parts is based on availability, supply chain requirements, and application-specific operating temperature constraints.

The UAL50-75RF8 supports the full operating temperature range of -55°C to 275°C. The TMC05075R00FE02 operates to 250°C maximum, which is suitable for most industrial applications but does not extend to the upper temperature limit of the primary part. The 850F75RE maintains the full -55°C to 275°C range.

Dimensional tolerances across all three parts are within typical manufacturing specifications for chassis mount resistors. PCB layout and thermal management considerations should account for minor dimensional variations.

Frequently Asked Questions (FAQ)

Q: Can the 850F75RE (Ohmite) directly replace the UAL50-75RF8 (Riedon)?

A: Yes. Both parts share identical electrical specifications (75 Ohms ±1%, 50W, ±20ppm/°C) and mechanical form factors (aluminum housing, flanged mounting, solder lugs). Dimensional differences are within manufacturing tolerances for this product category.

Q: What is the operating temperature difference between substitutes?

A: The UAL50-75RF8 and 850F75RE both operate from -55°C to 275°C. The TMC05075R00FE02 operates from -55°C to 250°C. For applications requiring operation above 250°C, the UAL50-75RF8 or 850F75RE must be used.

Q: Are all substitutes RoHS compliant?

A: Yes. All three parts are ROHS3 Compliant, meeting current regulatory requirements for electronic components in regulated markets.

Q: Do dimensional variations affect PCB layout?

A: Dimensional variations are minimal (within 0.03" / 0.76mm across length and width). Standard PCB footprints for 50W wirewound chassis mount resistors accommodate all three parts without modification.

Q: What is the difference between the Riedon UAL series and Ohmite Metal-Mite®89 series?

A: Both are wirewound chassis mount resistor series with identical electrical performance for this 75 Ohm 50W specification. Series designation reflects manufacturer product line organization and does not affect electrical or mechanical compatibility.

Q: Can the TMC05075R00FE02 be used in high-temperature applications above 250°C?

A: No. The TMC05075R00FE02 maximum operating temperature is 250°C. Applications requiring sustained operation above 250°C require the UAL50-75RF8 or 850F75RE.