The QCH28515T/RCH28515T series of DC-DC converters provides the ruggedness, reliability and features required to meet the advanced challenges of today's hi-rel market. This family of converters uses all surface-mounted hybrid components including magnetics, all ceramic capacitors and ultrasonic wirebonds to give long life in full temperature range and high acceleration environments. There is no power derating anywhere in the 55C to 125C operating range.