The 18AH-04 part is a metal-oxide-semiconductor field-effect transistor (MOSFET) from Aeroflex. It is a small low-profile surface-mount device suitable for a wide variety of applications. The device features a drain breakdown voltage of 60 V, a continual drain current of 3 A, and an internal gate-source voltage of 18 V. Additionally, it offers a selection of package types, including SOT-23, SOT223, DPAK, and TO-220. The 18AH-04 offers a wide range of advantages, such as low power consumption, superior thermal performance, high reliability, and a low cut-off frequency (Ft) of 4 MHz.