I have designed printed circuit board for a project that requires a (logic-level) MOSFet controlled directly by an AVR micro at 5 volts feeding a step-up transformer. The boards have already been completed. I had originally used a MOSFet I stole off a reference board and tried to source it from a Chinese factory. This was my mistake as I can not source this MOSFet any more. I've been trying to find a drop in replacement from Mouser. I think I may have found one but I want to be sure.
Update: Looking through some stuff, I'm feeling comfortable with the second replacement part I posted (The BUK9880) I also read in the data sheet the minimum and maximum gate voltages were between 1 to 2 volts. So I chose to change the voltage divider values to 10K ohm for R15 and 5.1K ohm for R16. I have yet to do any testing on the board, I just got it soldered up. Can anyone confirm if running this without a Piezo element attached would release the magic smoke from the MOSFET or the coil? and if so, why and also how can I put a dummy load on it to test?
This is the original part PA110BDA Datasheet PDF
This is the new part that I think might work NCV8403BDTRKG Datasheet PDF
EDIT: I've been made aware that the replacement I originally choose may not be able to handle to switching frequency needed. I looked again and this is the closest thing I could find in the required package type. BUK9880-55A Datasheet
This is the way the board is designed; (NOTE: R17 is actually a 330uH inductor, I used the wrong component in the schematic.)
The circuit uses a PWM signal from the AVR to drive an ultra sonic transducer at around 113khz with a supply voltage of no more then 5 volts. current draw is negligible at less the 600ma but I'm sticking to the reference design used for the driver with similar MOSFet values.