View mmsf5n03z datasheet:

MOTOROLA Order this document SEMICONDUCTOR TECHNICAL DATA by MMSF5N03Z/D Advance Information MMSF5N03Z Medium Power Surface Mount Products Motorola Preferred Device TMOS Single N-Channel with Monolithic Zener ESD SINGLE TMOS Protected Gate POWER MOSFET EZFETs? are an advanced series of power MOSFETs which utilize 5.0 AMPERES Motorola’s High Cell Density TMOS process and contain monolithic 30 VOLTS back–to–back zener diodes. These zener diodes provide protection RDS(on) = 0.030 OHM against ESD and unexpected transients. These miniature surface ? mount MOSFETs feature ultra low RDS(on) amd true logic level performance. They are capable of withstanding high energy in the avalanche and commutation modes and the drain–to–source diode has a very low reverse recovery time