AS1Fx Standard Avalanche Surface-Mount Rectifiers Vishay AS1Fx Standard Avalanche Surface-Mount Rectifiers are ideal for general purpose rectification of power supplies, inverters, converters, and freewheeling diodes. This includes the consumer, automotive, and telecommunication industries. They feature a low profile package, making them ideal for automated placement. The rectifiers have a low forward voltage drop and a low reverse current. They meet MSL level 1, per J-STD-020 with an LF maximum peak of 260°C.