UF4007Ultrafast silicon rectifier

UF4007 is a two-terminal ultrafast silicon rectifier. Its glass-passivated PN junction passes forward current from anode to cathode and blocks reverse voltage within its limits. The band on the black axial body marks the cathode. This page follows Vishay’s 1000 V, 1 A DO-41 device. Unlike a general-purpose rectifier, it has a specified 75 ns maximum recovery time under the manufacturer’s test conditions. Switching frequency alone does not determine suitability: temperature, recovery current and circuit inductance matter too. An isolated 9 V RMS half-wave circuit demonstrates polarity and output shape at low voltage. Its fixed 0.7 V model is explanatory, not a guaranteed UF4007 drop. A slow bench circuit illustrates rectification; measuring nanosecond recovery requires appropriate high-bandwidth equipment.