UAL25-25RF8 Equivalent & Substitute Parts

Part Overview

The UAL25-25RF8 is a 25 Ohms ±1% 25W wirewound chassis mount resistor manufactured by Riedon. 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 supply circuits, load banks, and measurement systems where reliable current measurement and thermal stability are critical. Substitute parts are necessary to address supply chain continuity, inventory availability, or specific packaging requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

UAL25-25RF8

RiedonIn Stock: 687UAL25-25RF8 Datasheet

Current PartRFQ

825F25RE

OhmiteIn Stock: 1158825F25RE Datasheet

DirectRFQ

RH02525R00FE02

Vishay DaleIn Stock: 1014RH02525R00FE02 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the UAL25-25RF8 is determined by strict equivalence across the following critical parameters:

• Resistance value: 25 Ohms
• Tolerance: ±1%
• Power dissipation: 25W
• Composition: Wirewound
• Temperature coefficient: ±20ppm/°C
• Housing material: Aluminum
• Mounting configuration: Flanges with solder lugs
• Package format: Axial, Box

The two substitute parts listed—825F25RE (Ohmite) and RH02525R00FE02 (Vishay Dale)—meet all core electrical specifications and mechanical mounting requirements. Dimensional variations within manufacturing tolerances do not affect functional interchangeability in standard chassis mount applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts—UAL25-25RF8, 825F25RE, and RH02525R00FE02—are Active status components with ROHS3 compliance and REACH unaffected certification, meeting current regulatory requirements for industrial and commercial applications.

The UAL25-25RF8 and 825F25RE both support the full operating temperature range of -55°C to 275°C. The RH02525R00FE02 operates to 250°C maximum, which is suitable for most standard applications but should be verified if the design requires operation above 250°C.

Dimensional differences are minor and within typical manufacturing tolerances for chassis mount resistors. All parts feature identical electrical characteristics and mounting interfaces, ensuring direct mechanical and electrical substitution in standard PCB and chassis applications.

Frequently Asked Questions (FAQ)

Q: Can the 825F25RE (Ohmite) directly replace the UAL25-25RF8 (Riedon)?

A: Yes. Both parts share identical electrical specifications (25 Ohms, ±1%, 25W, ±20ppm/°C) and mechanical mounting features (aluminum housing, flanges, solder lugs). Dimensional variations are within acceptable tolerances for chassis mount applications.

Q: What is the key difference between the RH02525R00FE02 and the other two parts?

A: The RH02525R00FE02 has a maximum operating temperature of 250°C, compared to 275°C for the UAL25-25RF8 and 825F25RE. All other electrical and mechanical parameters are equivalent. Selection depends on the application's thermal requirements.

Q: Are there packaging differences between these parts?

A: The UAL25-25RF8 and RH02525R00FE02 are supplied in Bulk packaging, while the 825F25RE is supplied in Tray packaging. This affects handling and storage but does not impact electrical or mechanical performance.

Q: Do all substitute parts meet current compliance standards?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for industrial and commercial electronics.

Q: What are the dimensional tolerances for these chassis mount resistors?

A: Length ranges from 1.062" to 1.063", width from 1.079" to 1.094", and height from 0.556" to 0.575". These variations are within standard manufacturing tolerances and do not affect mounting or thermal performance in typical applications.