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A3400 will definitely not work at 5A (P = I^2 * r = 25 * 0.052 = 1.3W). It is not a power MOSFET. The original question is about how to turn on a MOSFET from a 3v3 Arduino, and I suggested that the A3400 can indeed be turn fully on at 3V.
You don't need any special smd tools. Just buy a fine solder tip and with a bit of practice you can easily solder smd parts using a regular soldering iron.
