UAL50-2RF8 Equivalent & Substitute Parts

Part Overview

The UAL50-2RF8 is a 2 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, flame proof construction, and pulse withstanding capability. The part maintains Active product status with 837 units in current inventory. Substitute parts are identified when equivalent electrical specifications, mechanical dimensions, and compliance certifications align with the original component requirements.

Substiute Parts

UAL50-2RF8

RiedonIn Stock: 861UAL50-2RF8 Datasheet

Current PartRFQ

850F2R0E

OhmiteIn Stock: 1248850F2R0E Datasheet

DirectRFQ

KAL50FB2R00

Stackpole Electronics IncIn Stock: 1291KAL50FB2R00 Datasheet

DirectRFQ

RH0502R000FE02

Vishay DaleIn Stock: 1204RH0502R000FE02 Datasheet

DirectRFQ

TMC0502R000FE02

Vishay DaleIn Stock: 1119TMC0502R000FE02 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UAL50-2RF8 are qualified based on the following criteria:

Electrical Parameters: Resistance value of 2 Ohms, tolerance of ±1%, and power rating of 50W must be identical across all substitutes.

Thermal Characteristics: Temperature coefficient of ±50ppm/°C and operating temperature range compatibility are required. The UAL50-2RF8 operates from -55°C to 275°C; substitutes operating within -55°C to 250°C are acceptable for most applications within this overlap range.

Mechanical Compatibility: Chassis mount configuration with flanged mounting, solder lug termination, and aluminum housing are mandatory. Physical dimensions must accommodate standard mounting footprints within tolerance.

Compliance & Certifications: All substitutes must maintain ROHS3 compliance and EAR99 ECCN classification. REACH status must be either REACH Unaffected or Vendor Undefined.

Composition & Construction: Wirewound construction is required for all substitutes to maintain equivalent electrical performance and thermal characteristics.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts meet the core electrical and mechanical requirements for direct replacement of the UAL50-2RF8. Selection between substitutes should be based on the following factors:

Temperature Range Consideration: The UAL50-2RF8 and 850F2R0E (Ohmite Metal-Mite®89) both support the full -55°C to 275°C operating range. The RH0502R000FE02 and TMC0502R000FE02 (both Vishay Dale) are limited to -55°C to 250°C. Applications requiring operation above 250°C must use either the original UAL50-2RF8 or the 850F2R0E substitute.

Compliance Status: All substitutes maintain ROHS3 compliance and EAR99 ECCN classification. The TMC0502R000FE02 carries Vendor Undefined REACH status, while all other parts are REACH Unaffected. For applications with strict REACH compliance requirements, the 850F2R0E, KAL50FB2R00, or RH0502R000FE02 are preferred.

Availability: All substitutes maintain higher inventory levels than the original part, with KAL50FB2R00 (Stackpole) offering the highest stock at 1198 units.

Dimensional Compatibility: Physical dimensions across all parts are within 0.03 inches (0.76mm) for length and width, and within 0.02 inches (0.51mm) for height, ensuring mechanical interchangeability in standard mounting applications.

Frequently Asked Questions (FAQ)

Q: Can the 850F2R0E replace the UAL50-2RF8 in all applications?

A: Yes. The 850F2R0E matches all electrical specifications and supports the full -55°C to 275°C operating temperature range of the original part. Physical dimensions are within standard tolerance for chassis mount flanged resistors.

Q: What is the difference between the Vishay Dale RH0502R000FE02 and TMC0502R000FE02?

A: Both parts are electrically and mechanically identical with matching resistance, tolerance, power rating, and temperature coefficient. The primary difference is REACH compliance status: RH0502R000FE02 is REACH Unaffected, while TMC0502R000FE02 is Vendor Undefined. For applications requiring confirmed REACH compliance, the RH0502R000FE02 is preferred.

Q: Are there temperature limitations when substituting the UAL50-2RF8?

A: The Vishay Dale parts (RH0502R000FE02 and TMC0502R000FE02) operate to 250°C maximum, compared to 275°C for the original UAL50-2RF8 and Ohmite 850F2R0E. Applications requiring sustained operation above 250°C must use either the original part or the Ohmite substitute.

Q: Do all substitutes have identical physical dimensions?

A: Dimensions are functionally equivalent within standard manufacturing tolerance. Length varies from 1.938" to 1.969", width from 1.140" to 1.156", and height from 0.620" to 0.641". These variations are within acceptable limits for standard chassis mount applications with flanged mounting.

Q: Which substitute offers the best inventory availability?

A: The KAL50FB2R00 (Stackpole Electronics Inc) provides the highest current stock at 1198 units, followed by RH0502R000FE02 at 1190 units and 850F2R0E at 1149 units.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All four substitute parts maintain ROHS3 compliance, matching the original UAL50-2RF8 specification.