AHA50AFB-75R Equivalent & Substitute Parts

Part Overview

The AHA50AFB-75R is a 75 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 917 units in stock. Equivalent and substitute parts are identified to provide design flexibility, supply chain alternatives, and performance optimization options for applications where the original specification can be met by alternative manufacturers.

Key Parameters

Parameter	Value
Resistance	75 Ohms
Tolerance	±1%
Power Rating	50W
Composition	Wirewound
Mounting Feature	Flanges
Lead Style	Solder Lugs
Package Type	Axial, Box
Operating Temperature Range	-55°C ~ 250°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AHA50AFB-75R are qualified based on the following electrical and mechanical parameters:

Resistance Value: 75 Ohms (exact match required)
Tolerance: ±1% (exact match required)
Power Rating: 50W (exact match required)
Composition: Wirewound (exact match required)
Mounting Configuration: Flanged chassis mount with solder lugs (exact match required)
Package Type: Axial, Box (exact match required)
Operating Temperature Range: Minimum -55°C to 250°C (substitute must meet or exceed this range)
RoHS Compliance: ROHS3 Compliant (required for regulatory compatibility)

The following parts meet all substitution criteria:

850F75RE (Ohmite, Metal-Mite®89 series)
TMC05075R00FE02 (Vishay Dale, TMC series)

Parameter Comparison

Parameter	AHA50AFB-75R (YAGEO)	850F75RE (Ohmite)	TMC05075R00FE02 (Vishay Dale)
Resistance	75 Ohms	75 Ohms	75 Ohms
Tolerance	±1%	±1%	±1%
Power Rating	50W	50W	50W
Temperature Coefficient	±200ppm/°C	±20ppm/°C	±20ppm/°C
Operating Temperature Range	-55°C ~ 250°C	-55°C ~ 275°C	-55°C ~ 250°C
Composition	Wirewound	Wirewound	Wirewound
Housing Type	Aluminum	Aluminum	Aluminum
Mounting Feature	Flanges	Flanges	Flanges
Lead Style	Solder Lugs	Solder Lugs	Solder Lugs
Package Type	Axial, Box	Axial, Box	Axial, Box
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Dimensions (L x W)	1.969" x 1.142" (50.00mm x 29.00mm)	1.938" x 1.156" (49.23mm x 29.36mm)	1.968" x 1.140" (49.99mm x 28.96mm)
Height - Seated (Max)	0.650" (16.50mm)	0.620" (15.75mm)	0.625" (15.87mm)

Engineering Selection Recommendations

All three parts—AHA50AFB-75R, 850F75RE, and TMC05075R00FE02—are active production components with ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for industrial and commercial applications.

The 850F75RE (Ohmite) and TMC05075R00FE02 (Vishay Dale) both feature improved temperature coefficients of ±20ppm/°C compared to the AHA50AFB-75R at ±200ppm/°C, resulting in superior thermal stability across the operating range. The 850F75RE extends the maximum operating temperature to 275°C, providing additional thermal margin. The TMC05075R00FE02 includes moisture-resistant features and maintains the 250°C upper temperature limit.

Physical dimensions are within 1% variation across all three parts, ensuring compatibility with standard chassis mount applications. Height differences range from 15.75mm to 16.50mm, which is negligible for most PCB and enclosure designs.

Selection should be based on supply chain availability, thermal performance requirements, and design margin preferences. All parts are functionally interchangeable for applications requiring 75 Ohms ±1% at 50W with flanged chassis mount configuration.

Frequently Asked Questions (FAQ)

Q: Can the 850F75RE or TMC05075R00FE02 be used as direct replacements for the AHA50AFB-75R?

A: Yes. Both substitute parts meet all electrical and mechanical specifications: 75 Ohms ±1%, 50W power rating, wirewound composition, flanged chassis mount with solder lugs, and ROHS3 compliance. Physical dimensions are within acceptable tolerance for standard mounting applications.

Q: What is the significance of the temperature coefficient difference between the AHA50AFB-75R and the substitute parts?

A: The AHA50AFB-75R has a temperature coefficient of ±200ppm/°C, while the 850F75RE and TMC05075R00FE02 are rated at ±20ppm/°C. This means the substitute parts exhibit 10 times better resistance stability across temperature variations, resulting in more predictable performance in thermal cycling environments.

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

A: Dimensional variations are minimal. The length ranges from 49.23mm to 50.00mm, width from 28.96mm to 29.36mm, and height from 15.75mm to 16.50mm. These differences are within standard mechanical tolerances for chassis mount applications and do not affect PCB layout or enclosure fit.

Q: Do all substitute parts have the same compliance certifications?

A: All three parts are ROHS3 compliant and REACH unaffected. The AHA50AFB-75R and TMC05075R00FE02 both specify REACH status as unaffected. The 850F75RE also maintains REACH unaffected status. All parts carry EAR99 ECCN classification and 8533.29.0000 HTSUS code.

Q: Which substitute part offers the best thermal performance?

A: The 850F75RE provides the highest operating temperature limit at 275°C and the lowest temperature coefficient at ±20ppm/°C. The TMC05075R00FE02 matches the temperature coefficient performance but maintains the 250°C upper limit of the original AHA50AFB-75R.

Q: Are inventory levels a consideration for part selection?

A: Current inventory shows 917 units of AHA50AFB-75R, 1034 units of 850F75RE, and 1163 units of TMC05075R00FE02 in stock. All parts are available in sufficient quantities for production applications.

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