UG4A to UG4D ultrafast efficient plastic rectifier with reverse voltage of 50 to 200 volts and forward current of 4.0 amperes. It features a flammability classification of 94V-0 and is ideally suited for use in very high frequency switching power supplies, inverters, and as free wheeling diodes. The rectifier has an ultrafast recovery time for high efficiency and soft recovery characteristics. It also has excellent high temperature switching and a glass passivated junction. The rectifier is capable of high temperature soldering and has a maximum weight of 0.045 ounce (1.2 grams).