AHA50AFB-2R Wirewound Chassis Mount Resistor – Equivalent & Substitute Parts

Part Overview

The AHA50AFB-2R is a 2 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 current limiting, load balancing, and thermal management in high-power circuits. Substitute parts are necessary when the primary manufacturer part becomes unavailable, when inventory constraints require alternative sourcing, or when design flexibility permits equivalent components from qualified manufacturers.

Substiute Parts

AHA50AFB-2R

YAGEOIn Stock: 1086AHA50AFB-2R Datasheet

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850F2R0E

OhmiteIn Stock: 1248850F2R0E Datasheet

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KAL50FB2R00

Stackpole Electronics IncIn Stock: 1291KAL50FB2R00 Datasheet

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RH0502R000FE02

Vishay DaleIn Stock: 1204RH0502R000FE02 Datasheet

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TMC0502R000FE02

Vishay DaleIn Stock: 1119TMC0502R000FE02 Datasheet

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UAL50-2RF8

RiedonIn Stock: 861UAL50-2RF8 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AHA50AFB-2R is determined by strict equivalence across the following parameters: resistance value (2 Ohms), tolerance (±1%), power rating (50W), composition (wirewound), mounting feature (flanges), lead style (solder lugs), housing material (aluminum), and compliance certifications (ROHS3, REACH Unaffected, EAR99). All identified substitute parts meet these core electrical and mechanical requirements. Temperature coefficient variations and maximum operating temperature differences do not disqualify substitution when the operating environment remains within the specified range of the selected alternative.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are Active product status and ROHS3 compliant. The 850F2R0E (Ohmite Metal-Mite®89) and KAL50FB2R00 (Stackpole Electronics Inc) offer extended maximum operating temperature to 275°C compared to the AHA50AFB-2R specification of 250°C, providing thermal margin in high-temperature applications. The RH0502R000FE02 and TMC0502R000FE02 (both Vishay Dale) maintain the 250°C maximum operating temperature matching the primary part. The UAL50-2RF8 (Riedon) matches the physical dimensions and temperature range of the AHA50AFB-2R while offering enhanced features including current sense capability and pulse withstanding characteristics. All parts maintain REACH Unaffected status and EAR99 export classification. Selection should be based on application-specific thermal requirements, available inventory, and any design-specific feature requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute the AHA50AFB-2R with any of the listed parts without circuit redesign?

A: Yes. All substitute parts share identical electrical specifications: 2 Ohms resistance, ±1% tolerance, and 50W power rating. Physical dimensions vary within ±1%, which is acceptable for chassis mount applications with flanged mounting. Verify that your PCB layout accommodates the specific height and width of the selected substitute.

Q: What is the significance of temperature coefficient differences?

A: The AHA50AFB-2R specifies ±200ppm/°C, while most substitutes specify ±50ppm/°C. Lower temperature coefficient indicates better resistance stability across temperature variations. This difference is relevant only in precision applications requiring tight resistance tolerance maintenance over wide temperature ranges.

Q: Are all parts suitable for my operating temperature range?

A: The AHA50AFB-2R operates from -55°C to 250°C. The 850F2R0E, KAL50FB2R00, and UAL50-2RF8 extend to 275°C maximum. If your application operates below 250°C, all parts are suitable. If your application requires operation above 250°C, select only 850F2R0E, KAL50FB2R00, or UAL50-2RF8.

Q: Do physical dimension differences affect compatibility?

A: All parts use flanged solder lug mounting with dimensions within ±1% of the primary part. Height variations range from 15.75mm to 16.50mm. Verify clearance in your mechanical assembly, particularly if space constraints exist above or below the component.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant certification and REACH Unaffected status, matching the primary AHA50AFB-2R compliance profile.

Q: Which substitute offers the best thermal performance?

A: The 850F2R0E (Ohmite) and KAL50FB2R00 (Stackpole) both offer ±50ppm/°C temperature coefficient and 275°C maximum operating temperature, providing superior thermal stability compared to the primary part.