AHA50AFB-250R Equivalent & Substitute Parts

Part Overview

The AHA50AFB-250R is a 250 Ohms ±1% 50W wirewound chassis mount resistor manufactured by YAGEO. This component is classified as Active product status and is designed for applications requiring high-power dissipation with precision resistance values in a flanged aluminum housing configuration. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits cross-manufacturer sourcing while maintaining electrical and mechanical compatibility.

Substiute Parts

AHA50AFB-250R

YAGEOIn Stock: 880AHA50AFB-250R Datasheet

Current PartRFQ

RH050250R0FE02

Vishay DaleIn Stock: 1251RH050250R0FE02 Datasheet

UpgradeRFQ

TMC050250R0FE02

Vishay DaleIn Stock: 810TMC050250R0FE02 Datasheet

UpgradeRFQ

UAL50-250RF8

RiedonIn Stock: 1253UAL50-250RF8 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AHA50AFB-250R are qualified based on the following critical parameters that must match or exceed the main part specifications:

• Resistance value: 250 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)
• Housing type: Aluminum (exact match required)
• Operating temperature range: Minimum -55°C to 250°C (substitute must support this range or higher)
• RoHS compliance: ROHS3 Compliant (exact match required)

All three substitute parts meet these criteria and are therefore electrically and mechanically interchangeable with the AHA50AFB-250R in applications where the specified parameters are required.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are Active product status components with ROHS3 compliance, meeting regulatory requirements equivalent to the AHA50AFB-250R. Selection among these alternatives should be based on the following factors:

RH050250R0FE02 and TMC050250R0FE02 (Vishay Dale) offer improved temperature coefficient performance at ±20ppm/°C compared to the AHA50AFB-250R at ±200ppm/°C, resulting in superior resistance stability across the operating temperature range. Both Vishay Dale parts feature moisture-resistant construction. The RH050250R0FE02 carries confirmed REACH Unaffected status, while TMC050250R0FE02 lists REACH status as Vendor Undefined.

UAL50-250RF8 (Riedon) maintains the same temperature coefficient specification as the Vishay Dale alternatives at ±20ppm/°C and extends the maximum operating temperature to 275°C, providing additional thermal margin. This part includes current sense, flame proof, pulse withstanding, and safety features. Dimensional compatibility is closest to the original AHA50AFB-250R, with identical length and width specifications.

All parts maintain identical electrical specifications (250 Ohms, ±1%, 50W) and mechanical mounting configurations (flanged aluminum housing with solder lugs). Dimensional variations in height are minimal and do not affect standard chassis mounting applications.

Frequently Asked Questions (FAQ)

Q: Can RH050250R0FE02 be used as a direct replacement for AHA50AFB-250R?

A: Yes. Both parts share identical electrical specifications (250 Ohms ±1% 50W wirewound), mounting configuration (flanged aluminum housing with solder lugs), and compliance certifications (ROHS3). Dimensional differences are negligible (height variation of 0.025" maximum). The RH050250R0FE02 offers superior temperature coefficient performance.

Q: What is the difference between TMC050250R0FE02 and RH050250R0FE02?

A: Both are Vishay Dale 250 Ohms ±1% 50W wirewound chassis mount resistors with identical electrical and mechanical specifications. The primary difference is REACH compliance status: RH050250R0FE02 is confirmed REACH Unaffected, while TMC050250R0FE02 lists REACH status as Vendor Undefined. Electrical performance and physical dimensions are equivalent.

Q: Why does UAL50-250RF8 have a higher maximum operating temperature?

A: The UAL50-250RF8 is rated to -55°C ~ 275°C, extending 25°C above the AHA50AFB-250R specification of -55°C ~ 250°C. This reflects the design characteristics of the Riedon component and provides additional thermal operating margin in high-temperature applications.

Q: Are there dimensional compatibility concerns when substituting these parts?

A: Dimensional variations are minimal. The RH050250R0FE02 and TMC050250R0FE02 are slightly shorter (0.625" vs. 0.650" seated height) and marginally narrower. The UAL50-250RF8 matches the original AHA50AFB-250R dimensions precisely. Standard chassis mounting applications accommodate these minor variations without modification.

Q: Which substitute part offers the best temperature stability?

A: RH050250R0FE02, TMC050250R0FE02, and UAL50-250RF8 all provide ±20ppm/°C temperature coefficient, compared to the AHA50AFB-250R at ±200ppm/°C. This represents a tenfold improvement in resistance stability across temperature variations, making any of these three substitutes superior for precision applications requiring minimal resistance drift.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts are ROHS3 Compliant and carry EAR99 ECCN classification. RH050250R0FE02 and UAL50-250RF8 are REACH Unaffected. TMC050250R0FE02 lists REACH status as Vendor Undefined. All parts are classified as Active product status.