The document describes the features and characteristics of the DVTR series of high reliability DC-DC converters. These converters can operate over the full military (-55 °C to +125 °C) temperature range without power derating. The DVTR series features a unique radiation immune magnetic feedback circuit. Operating at a nominal fixed frequency of 500 kHz, these regulated, isolated units utilize undervoltage lockout circuitry to eliminate slow start-up problems. The converters are designed and manufactured in a facility qualified to ISO9001 and certified to MIL-PRF-38534 and MIL-STD-883. The product may incorporate one or more of the following U.S. patents: 5,784,266 5,790,389 5,963,438 5,999,433 6,005,780 6,084,792 6,118,673.