AHA50AFB-20R Equivalent & Substitute Parts

Part Overview

The AHA50AFB-20R is a 20 Ohms ±1% 50W wirewound chassis mount resistor manufactured by YAGEO. This active product is designed for high-power applications requiring precision resistance with aluminum housing and flanged mounting. Equivalent and substitute parts are necessary to address supply chain flexibility, inventory availability, and application-specific performance requirements across multiple manufacturers.

Key Parameters

Parameter	Value
Resistance	20 Ohms
Tolerance	±1%
Power Rating	50W
Composition	Wirewound
Coating/Housing Type	Aluminum
Mounting Feature	Flanges
Lead Style	Solder Lugs
Package/Case	Axial, Box
Operating Temperature Range	-55°C ~ 250°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AHA50AFB-20R is determined by strict equivalence across the following parameters: resistance value (20 Ohms), tolerance (±1%), power rating (50W), composition (wirewound), housing type (aluminum), mounting feature (flanges), lead style (solder lugs), and package configuration (axial, box). All substitute parts listed meet these core electrical and mechanical requirements. Variations in temperature coefficient, maximum operating temperature, and additional features do not disqualify substitution but represent performance differentiators for specific application contexts.

Parameter Comparison

Parameter	AHA50AFB-20R (YAGEO)	KAL50FB20R0 (Stackpole)	RH05020R00FE02 (Vishay Dale)	TMC05020R00FE02 (Vishay Dale)	UAL50-20RF8 (Riedon)
Resistance	20 Ohms	20 Ohms	20 Ohms	20 Ohms	20 Ohms
Tolerance	±1%	±1%	±1%	±1%	±1%
Power (Watts)	50W	50W	50W	50W	50W
Composition	Wirewound	Wirewound	Wirewound	Wirewound	Wirewound
Temperature Coefficient	±200ppm/°C	±30ppm/°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
Coating/Housing Type	Aluminum	Aluminum	Aluminum	Aluminum	Aluminum
Mounting Feature	Flanges	Flanges	Flanges	Flanges	Flanges
Size/Dimension	1.969" L x 1.142" W (50.00mm x 29.00mm)	1.968" L x 1.140" W (49.99mm x 28.96mm)	1.968" L x 1.140" W (49.99mm x 28.96mm)	1.968" 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)	0.641" (16.28mm)	0.625" (15.87mm)	0.625" (15.87mm)	0.630" (16.00mm)
Lead Style	Solder Lugs	Solder Lugs	Solder Lugs	Solder Lugs	Solder Lugs
Package/Case	Axial, Box	Axial, Box	Axial, Box	Axial, Box	Axial, Box
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts—KAL50FB20R0, RH05020R00FE02, TMC05020R00FE02, and UAL50-20RF8—are active products with ROHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the AHA50AFB-20R. Selection among these substitutes should be based on supply chain availability, inventory levels, and application-specific thermal performance requirements. The KAL50FB20R0 and UAL50-20RF8 offer extended operating temperature ranges to 275°C compared to the AHA50AFB-20R and Vishay Dale variants at 250°C. The RH05020R00FE02 and TMC05020R00FE02 provide superior temperature coefficient stability at ±20ppm/°C. Dimensional variations are minimal across all parts, with height differences not exceeding 0.025" (0.63mm), ensuring mechanical compatibility in standard chassis mount applications.

Frequently Asked Questions (FAQ)

Q: Can KAL50FB20R0 directly replace AHA50AFB-20R in all applications? A: Yes. Both parts meet identical electrical specifications (20 Ohms ±1%, 50W wirewound) and mechanical requirements (aluminum housing, flanged mounting, solder lugs). The KAL50FB20R0 offers improved temperature coefficient (±30ppm/°C vs. ±200ppm/°C) and extended operating temperature to 275°C, making it suitable for higher-temperature environments.

Q: What are the dimensional compatibility considerations? A: All substitute parts maintain nearly identical footprints within 0.001" (0.025mm) for length and width. Height variations range from 0.625" to 0.650" (15.87mm to 16.50mm). These minor differences do not affect standard chassis mount applications with flanged mounting.

Q: Are there differences in moisture resistance between substitutes? A: KAL50FB20R0, RH05020R00FE02, and TMC05020R00FE02 are specified as moisture resistant. AHA50AFB-20R and UAL50-20RF8 carry MSL rating 1 (unlimited). All parts are suitable for standard industrial environments.

Q: Which substitute offers the best temperature stability? A: RH05020R00FE02 and TMC05020R00FE02 provide the lowest temperature coefficient at ±20ppm/°C. KAL50FB20R0 offers ±30ppm/°C. These represent superior stability compared to AHA50AFB-20R at ±200ppm/°C for precision applications.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the AHA50AFB-20R regulatory status.

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