AHA50AFB-2R5 Equivalent & Substitute Parts

Part Overview

The AHA50AFB-2R5 is a 2.5 Ohms ±1% 50W wirewound chassis mount resistor manufactured by YAGEO. This component is classified as Active product status and is designed for applications requiring precision power dissipation with stable thermal performance across industrial temperature ranges. Substitute parts are identified to provide alternative sourcing options when the primary part becomes unavailable or when design requirements necessitate components with enhanced specifications or different manufacturer certifications.

Substiute Parts

AHA50AFB-2R5

YAGEOIn Stock: 784AHA50AFB-2R5 Datasheet

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TMC0502R500FE02

Vishay DaleIn Stock: 1681TMC0502R500FE02 Datasheet

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UAL50-2R5F8

RiedonIn Stock: 1258UAL50-2R5F8 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AHA50AFB-2R5 are qualified based on the following electrical and mechanical parameters:

• Resistance value: 2.5 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 50W (exact match required)
• Composition: Wirewound (exact match required)
• Mounting feature: Flanges (exact match required)
• Lead style: Solder Lugs (exact match required)
• Package type: Axial, Box (exact match required)
• Operating temperature range: Minimum -55°C, minimum upper limit of 250°C
• RoHS compliance: ROHS3 Compliant (exact match required)

The identified substitutes TMC0502R500FE02 (Vishay Dale) and UAL50-2R5F8 (Riedon) meet all mandatory electrical and mechanical criteria. Variations in temperature coefficient, additional features, and dimensional tolerances are secondary parameters that do not disqualify substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

All three components meet the mandatory electrical and mechanical specifications for direct substitution. Selection between the AHA50AFB-2R5, TMC0502R500FE02, and UAL50-2R5F8 should be based on the following factors:

AHA50AFB-2R5 (YAGEO): Primary choice when REACH Unaffected status is required and standard temperature coefficient performance is acceptable. Suitable for general industrial applications within the -55°C to 250°C range.

TMC0502R500FE02 (Vishay Dale): Appropriate when improved temperature coefficient stability (±50ppm/°C versus ±200ppm/°C) is beneficial for precision applications. Moisture resistant feature provides enhanced environmental protection. REACH status is vendor-defined and should be confirmed with the manufacturer for regulatory compliance requirements.

UAL50-2R5F8 (Riedon): Optimal selection when extended operating temperature range (-55°C to 275°C) is required. Additional certifications including current sense capability, flame proof rating, pulse withstanding, and safety features make this component suitable for demanding industrial and safety-critical applications. REACH Unaffected status is confirmed.

Frequently Asked Questions (FAQ)

Q: Can TMC0502R500FE02 be used as a direct replacement for AHA50AFB-2R5?

A: Yes. Both components share identical resistance (2.5 Ohms), tolerance (±1%), power rating (50W), composition (wirewound), mounting features (flanges), lead style (solder lugs), package type (axial, box), and RoHS3 compliance. The TMC0502R500FE02 features improved temperature coefficient (±50ppm/°C) and moisture resistance, making it functionally compatible for direct substitution.

Q: What is the difference in temperature coefficient between these parts?

A: The AHA50AFB-2R5 has a temperature coefficient of ±200ppm/°C, while both TMC0502R500FE02 and UAL50-2R5F8 have ±50ppm/°C. Lower temperature coefficient values indicate better resistance stability across temperature variations, beneficial for precision applications.

Q: Which substitute part supports the highest operating temperature?

A: The UAL50-2R5F8 supports an operating temperature range of -55°C to 275°C, compared to -55°C to 250°C for both the AHA50AFB-2R5 and TMC0502R500FE02. This 25°C extended upper limit may be critical for high-temperature industrial environments.

Q: Are all three parts RoHS3 compliant?

A: Yes, all three components are ROHS3 Compliant. However, REACH status differs: AHA50AFB-2R5 and UAL50-2R5F8 are REACH Unaffected, while TMC0502R500FE02 has Vendor Undefined REACH status. Confirm REACH compliance with Vishay Dale if regulatory requirements mandate REACH Unaffected status.

Q: Do dimensional differences affect mechanical compatibility?

A: All three components are housed in aluminum with flanged mounting and solder lugs. Dimensional variations (length, width, height) are within manufacturing tolerances and do not affect mechanical compatibility in standard chassis mount applications. Verify mounting hole spacing and clearance in your specific application.

Q: What additional features does UAL50-2R5F8 provide?

A: The UAL50-2R5F8 includes current sense capability, flame proof rating, pulse withstanding, and safety certifications. These features make it suitable for applications requiring enhanced safety performance and transient protection beyond standard resistor specifications.