Description

The 1N5408 is a popular 3A general-purpose silicon rectifier diode. It is widely used in power supplies, inverters, and battery chargers to convert AC to DC and features high current capability, a low forward voltage drop, and high surge tolerance. [1, 2, 3, 4] Key Specifications • Maximum Repetitive Reverse Voltage (V_{RRM}): 1000 V • Average Forward Current (I_{F(AV)}): 3 A • Peak Forward Surge Current (I_{FSM}): 200 A (8.3 ms single half-sine-wave) • Forward Voltage Drop (V_F): 1.0 V to 1.2 V (at 3 A) • Reverse Current (I_R): 5 μA at 25°C (up to 500 μA at 150°C) • Operating & Storage Temperature: -55°C to +150°C • Package Type: DO-201AD (or DO-27) [1, 2, 5, 6] Common Applications • Half-wave and full-wave rectification circuits • Polarity protection / reverse-current prevention • Free-wheeling / flyback diodes in inductive loads • General power management and high-current AC/DC conversion [4, 7, 8] Equivalents & Alternatives • Direct Equivalents: 1N5404, 1N5406, 1N5407 (lower voltage variants) • Substitutes: FR307, HER308, P300M, UF5408 [2, 6, 9, 10]