Traco Power announced the release of its TFI series of surge filters designed to clamp momentary overvoltage transients up to 385 V dc (20 ms) to protect dc-dc converters from being damaged. Input transients defined by EN 50155 (up to 154 V dc) are covered by the wide input range of dedicated railway converters. This level of protection is specifically required in railway applications where high-voltage transients are expected; they can also be used for 72-, 96-, and 110-V dc battery systems.
The series consists of three wattage models: the TFI 20 (20 W in a DIP-24 package), TFI 150 (150 W in a 1.6 x 2-in. footprint), and TFI 300 (300 W in a 1.6 x 2-in. footprint). Each TFI filter operates over a 43- to 160-V dc range and is fully encapsulated within a plastic package for MIL-STD-810 thermal shock and vibration protection, says the company.
Features include an operating temperature range of -40 to +95°C and a minimum 36-V dc brownout. During normal operation, the output voltage follows the input voltage (Vout = Vin – 2 V dc typ.) up to the point of 168 V dc, where the voltage is actively clamped. All models are RIA 12 and NFF 01-510 compliant for surge susceptibility protection and are supported by Traco Power's three-year product warranty.
Products are in stock and available through the Traco Power global distribution network with manufacturing lead times of 12 to 14 weeks. Go here for specifications, drawings, and safety documentation.