AHA50AFB-40R Equivalent & Substitute Parts

Part Overview

The AHA50AFB-40R is a 40 Ohms ±1% 50W wirewound chassis mount resistor manufactured by YAGEO in the AHA series. This component is designed for high-power applications requiring precision resistance with stable thermal characteristics. The part is currently active in production with full RoHS3 compliance and REACH unaffected status. Equivalent and substitute parts are identified for applications requiring alternative sourcing, inventory management, or specific performance characteristics within the defined electrical and mechanical parameters.

Key Parameters

Parameter	Value
Resistance	40 Ohms
Tolerance	±1%
Power Rating	50W
Composition	Wirewound
Mounting Feature	Flanges
Lead Style	Solder Lugs
Operating Temperature Range	-55°C ~ 250°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AHA50AFB-40R are qualified based on matching the following critical parameters: 40 Ohms resistance value, ±1% tolerance, 50W power rating, wirewound composition, aluminum housing with flanged mounting, and solder lug termination. All substitute parts maintain RoHS3 compliance and REACH unaffected status. Operating temperature range and temperature coefficient variations are noted but do not disqualify substitution within the specified electrical and mechanical envelope. The four identified substitutes—850F40RE (Ohmite), RH05040R00FE02 (Vishay Dale), TMC05040R00FE02 (Vishay Dale), and UAL50-40RF8 (Riedon)—meet these core substitution criteria.

Parameter Comparison

Parameter	AHA50AFB-40R (YAGEO)	850F40RE (Ohmite)	RH05040R00FE02 (Vishay Dale)	TMC05040R00FE02 (Vishay Dale)	UAL50-40RF8 (Riedon)
Resistance	40 Ohms	40 Ohms	40 Ohms	40 Ohms	40 Ohms
Tolerance	±1%	±1%	±1%	±1%	±1%
Power Rating	50W	50W	50W	50W	50W
Composition	Wirewound	Wirewound	Wirewound	Wirewound	Wirewound
Temperature Coefficient	±200ppm/°C	±20ppm/°C	±20ppm/°C	±20ppm/°C	±20ppm/°C
Operating Temperature	-55°C ~ 250°C	-55°C ~ 275°C	-55°C ~ 250°C	-55°C ~ 250°C	-55°C ~ 275°C
Housing Type	Aluminum	Aluminum	Aluminum	Aluminum	Aluminum
Mounting Feature	Flanges	Flanges	Flanges	Flanges	Flanges
Lead Style	Solder Lugs	Solder Lugs	Solder Lugs	Solder Lugs	Solder Lugs
Size / Dimension	1.969" L x 1.142" W (50.00mm x 29.00mm)	1.938" L x 1.156" W (49.23mm x 29.36mm)	1.968" L x 1.140" W (49.99mm x 28.96mm)	1.968" L x 1.140" W (49.99mm x 28.96mm)	1.969" L x 1.142" W (50.00mm x 29.00mm)
Height - Seated (Max)	0.650" (16.50mm)	0.620" (15.75mm)	0.625" (15.87mm)	0.625" (15.87mm)	0.630" (16.00mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All four substitute parts maintain active product status and full compliance with RoHS3 and REACH requirements, matching the AHA50AFB-40R baseline. The 850F40RE (Ohmite Metal-Mite®89 series) and UAL50-40RF8 (Riedon UAL series) offer extended operating temperature ranges to 275°C compared to the 250°C maximum of the primary part and Vishay Dale alternatives. The RH05040R00FE02 and TMC05040R00FE02 (both Vishay Dale RH and TMC series) include moisture-resistant features and maintain dimensional compatibility within tolerance. All substitutes feature improved temperature coefficients (±20ppm/°C) relative to the AHA50AFB-40R (±200ppm/°C), providing enhanced stability across the operating temperature range. Dimensional variations are minimal across all parts, with height differences not exceeding 0.030" (0.75mm), ensuring compatibility with standard chassis mount applications.

Frequently Asked Questions (FAQ)

Q: What electrical parameters must match for substitution of the AHA50AFB-40R?

A: The resistance value (40 Ohms), tolerance (±1%), and power rating (50W) are the primary electrical parameters that must match exactly. All qualified substitutes maintain these specifications.

Q: Are there dimensional differences between the AHA50AFB-40R and its substitutes?

A: Minor dimensional variations exist. The AHA50AFB-40R measures 1.969" L x 1.142" W with a maximum seated height of 0.650". The 850F40RE is slightly smaller at 1.938" L x 1.156" W with 0.620" height. The Vishay Dale parts (RH05040R00FE02 and TMC05040R00FE02) measure 1.968" L x 1.140" W with 0.625" height. The UAL50-40RF8 matches the original at 1.969" L x 1.142" W with 0.630" height. These variations are within typical chassis mount application tolerances.

Q: Do all substitutes maintain the same operating temperature range?

A: The AHA50AFB-40R operates from -55°C to 250°C. The 850F40RE and UAL50-40RF8 extend to 275°C. The Vishay Dale parts (RH05040R00FE02 and TMC05040R00FE02) match the original at -55°C to 250°C. Selection should be based on application temperature requirements.

Q: What is the significance of temperature coefficient differences?

A: The AHA50AFB-40R has a temperature coefficient of ±200ppm/°C, while all substitutes feature ±20ppm/°C. Lower temperature coefficients indicate greater resistance stability across temperature variations, providing improved performance in temperature-sensitive applications.

Q: Are all substitutes RoHS3 and REACH compliant?

A: Yes. All four substitute parts—850F40RE, RH05040R00FE02, TMC05040R00FE02, and UAL50-40RF8—are RoHS3 compliant and REACH unaffected, matching the compliance status of the AHA50AFB-40R.

Q: What additional features do some substitutes offer?

A: The RH05040R00FE02 and TMC05040R00FE02 include moisture-resistant features. The UAL50-40RF8 includes current sense, flame proof, pulse withstanding, and safety features. These additional features do not affect basic substitution compatibility but may provide benefits in specific application environments.

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