he BAT54S in a SOT-23 package is a surface-mount dual series Schottky barrier diode array. It integrates two fast-switching, low-forward-voltage diodes connected in series within a standard 3-pin package, making it widely used for ESD/overvoltage rail clamping, high-speed switching, and signal steering. Key Specifications • Configuration. Dual Schottky diodes connected in series. • Package. SOT-23 (TO-236AB) 3-pin surface mount. • Maximum Reverse Voltage (\(V_{R}\) / \(V_{RRM}\)). 30 V. • Continuous Forward Current (\(I_{F}\)). 200 mA maximum (100 mA on select variants such as SMC Diode Solutions). • Forward Surge Current (\(I_{FSM}\)). 600 mA maximum (pulse width ≤ 1.0 s). • Forward Voltage Drop (\(V_{F}\)). 240 mV maximum at 0.1 mA, 320 mV at 1 mA, and 800 mV to 1.0 V maximum at 100 mA. • Reverse Recovery Time (\(t_{rr}\)). 5 ns maximum. • Diode Capacitance (\(C_{d}\)). 10 pF maximum at \(V_R = 1\text{ V}\). • Reverse Leakage Current (\(I_{R}\)). 2 µA maximum at \(V_R = 25\text{ V}\).