The BU323Z is a planar, monolithic, highvoltage power Darlington with a builtin active zener clamping circuit. This device is specifically designed for unclamped, inductive applications such as Electronic Ignition, Switching Regulators and Motor Control, and exhibit the following main features: Integrated HighVoltage Active Clamp Tight Clamping Voltage Window (350 V to 450 V) Guaranteed Over the 40C to +125C Temperature Range Clamping Energy Capability 100% Tested in a Live Ignition Circuit