Small-signal Schottky in a DO-35 axial body
The BAT42 is a small-signal Schottky barrier diode rated for 30 V reverse voltage and 200 mA average rectified current, housed in a through-hole DO-35 (DO-204AH) axial-lead glass package. Its 5 ns reverse recovery time and 7 pF junction capacitance at 1 V reverse bias make it suited for fast-switching low-current applications such as polarity protection, clamping, and high-speed signal rectification in mixed-signal or RF bias circuits.
Forward drop, leakage, and the operating window
Reverse leakage is specified at 500 nA maximum at 25 V reverse bias — 83 % of the 30 V Vr(max) rating — confirming the barrier quality holds near the voltage ceiling; leakage doubles roughly every 10 °C above 25 °C junction, so a design running at 85 °C ambient should budget 4-8 µA leakage per diode.