3. Traco 3W TDN 3WI Series Isolated DC-DC Converters. The Traco TDN 3WI series of isolated DC-DC converters is a range of 3 Watt regulated DC-DC converters. The TDN series are constructed within a compact DIP package measuring 13.2 x 9 x 10 mm, making the series suitable for use within applications where space is at a premium. Ultra-compact DIP package. I/O-isolation 1'500VDC. Fully regulated outputs. Operating temperature range -40°C to +70°C without derating. Short circuit protection. Remote on/off functionality.