Power Dense Wide Input Half-Brick 300W EN50155 Rail DC-DC Converters
Rail power networks experience large transients and multiple voltage sources, which can result in multiple BOM PSU options for a single product. With wide 4:1 input voltage ranges – available in 9-36V, 18-75V and 40-160V – the HAE300W simplifies rail power design by accommodating a broad variety of supply conditions. This versatility allows engineers to consolidate PSU options, reduce BOM complexity and lower costs.
The standard half-brick DOSA products come fully featured with remote on/off control (both positive and negative logic), 10% trim up, 20% trim down and enclosed metal casing for improved thermal and radiated performance. The range accommodates 7 single output voltages between 5 & 54V, with efficiencies up to an impressive 92.5%.

The HAE300W range is suitable for the most robust installations. Conforming to:
- EN50155 and IEC/EN/UL 62368-1: Railway applications & electrical safety
- EN45545-2: Thermal safety
- EN61373 / MIL-STD-810F: Thermal shock and vibration
- EMC compliance: EN50121-3-2 Class A (standalone) and Class B with additional components.
These tough units will operate in extreme thermal conditions from as low as –40°C, up to +105°C with a number of heatsink options or through hole plate mounting. Combined with a 3-year warranty, the HAE300W series is the ideal solution for compact rail designs.
As usual, 3D models are available to download from our website, to streamline mechanical integration. Engineering samples are available for evaluation. Please get in touch with your Fidus Account Manager or call us on 01183 420730.