Hi Paul,

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Look for their datasheets.

AOD472 is rated at 50A with an RDSon of 0,0095 Ohm

BUZ72A is rated at 11A with an RDSon of 0,25 Ohm

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What this tells you is, the BUZ72A is only able to handle about 1/5^th of the total current. It also has a much higher internal resistance when turned on (RDSon),

meaning it will heat up a lot more for the same amount of current.

No idea what those MOSFET’s are handling, but you’re looking at a possible “cloud of smoke” for each BUZ.

Only advantage I see on those BUZ is their higher voltage handling. Which partially explains the downside with current.

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AOD472 is rated at 25V. Use this parameter to look for a good replacement in that package you want. Generally speaking, the lower the voltage rating,

the higher the current handling. RDSon varies wildly from device to device (along with price…), a lower RDSon (internal resistance when on), means

lower heat generation, and smaller heatsinks.

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Can’t remember any of the top of my head, supplier websites usually have a search tool with filters, where these parameters are selectable.

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Nuno T.

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