The difference is only in one letter, so easy to overlook, and although sometimes used as a substitute, IRLZ44N and IRFZ44N are fundamentally different. The IRLZ44N is a logic-level MOSFET transistor. This version uses a gate threshold voltage of 5V. In other words, triggering this MOSFET transistor requires little effort, and therefore no driver IC is needed for this purpose. The IRFZ44N is different. Instead, the MOSFET IC must work with a gate driver and microcontroller. In this way, the MOSFET transistor can be completely triggered. Otherwise, we get only partial turn-on time through the I/O pin when using a direct 5 V supply. And since there was a mention of microcontrollers, we are getting closer to efficient, functional operation here, for example, the indispensable Arduino Uno or the multifunctional Raspberry Pi.