TRACO POWER now sells TFI Series surge filters designed to clamp momentary over-voltage transients up to 385 Vdc (20 msec) to protect dc/dc converters from being damaged.

Input transients defined by EN 50155 (up to 154 Vdc) 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 and can also be used for 72, 96 and 110 Vdc battery systems.

The series consists of three wattage models:

• The TFI 20 (20 Watt in a DIP-24 Package)
• TFI 150 (150 Watt in a 1.6 x 2.0-in. footprint)
• TFI 300 (300 Watt in a 1.6 x 2.0-in. footprint)

Each TFI filter operates over the 43-160 Vdc and is fully encapsulated within a plastic package for MIL-STD-810 Thermal Shock and Vibration protection. Features include an operating temperature range of -40 to +95° C and minimum 36 Vdc brownout. During normal operation, the output voltage follows the input voltage (Vout = Vin -2 Vdc typ.) up to the point of 168 Vdc … where the voltage is actively clamped.

All models are RIA 12 and NF F 01-510 compliant for surge susceptibility protection and are supported by TRACO POWER’s 3-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. For more information, visit www.tracopower.us/tfi.