Schottky barrier diode for low-voltage, fast-switching signal paths
The STMicroelectronics BAR42FILM is a Schottky barrier diode rated for 30 V DC reverse voltage and 100 mA average rectified current, housed in a surface-mount SOT-23-3 package. It is designed for low-voltage, high-speed switching applications where forward voltage drop and reverse recovery time matter — the datasheet lists a maximum forward voltage of 1 V at 100 mA forward current and a reverse recovery time of 5 ns. Junction capacitance is only 7 pF at 1 V reverse bias and 1 MHz, which keeps signal integrity intact in RF detector and clamping circuits. The part is active in production and ROHS3 compliant, so it fits current BOMs without a lifecycle concern.
What the forward voltage and recovery time mean for your circuit
At 100 mA forward current the BAR42FILM drops no more than 1 V — a Schottky's advantage over a standard pn-junction diode in low-voltage rails. The 5 ns reverse recovery time means it can follow fast-switching edges without excessive stored-charge tail, which is what you want in a freewheeling clamp across an inductive load or in a high-frequency rectifier stage. The 500 nA maximum reverse leakage at 30 V reverse bias is low enough to avoid loading sensitive nodes in battery-powered or high-impedance circuits.
Package and mounting — SOT-23-3 footprint
The BAR42FILM ships in a standard SOT-23-3 surface-mount package (also referenced as TO-236-3 or SC-59). The small footprint suits dense PCB layouts, and the part is available in Tape & Reel or Cut Tape options for both automated pick-and-place and prototype assembly. No special thermal management is needed at 100 mA average current.