1N4938 is a small signal diode produced by Fairchild Semiconductor Corporation. The maximum reverse voltage of this diode is 200 V, the average rectified forward current is 500 mA, the non-repetitive peak forward surge current is 1.0 A or 4.0 A, the storage temperature range is -65 to +200°C, the operating junction temperature is 175°C, the maximum power dissipation is 500 mW, the junction to ambient thermal resistance is 300°C/W, the breakdown voltage is 200 V, the forward voltage is 1.0 V, the reverse leakage is 100 nA or 100 µA, the total capacitance is 5 pF, and the reverse recovery time is 50 ns.