Convection cooling eliminates fan maintenance and audible noise

TDK-Lambdavisit website


TDK Corporation is introducing the TDK-Lambda CUS250LD series of low-profile, AC-DC power supplies. These single-output supplies provide 250W of output power with convection cooling; requiring no fans, this design eliminates the need for fan maintenance, and reduces acoustic noise and vibrations. In addition, they feature a low profile of only 30mm and a compact footprint of 198 × 101.6mm, making them suitable for applications in light industrial, LED signage, communications, broadcast, point-of-sale, IT, and test & measurement equipment.

The supplies operate from a universal input of 85-264V AC, 47-63Hz, with PFC, enabling them to be used anywhere in the world. Moreover, they can operate from a 120-370V DC input. These units have an input-to-output withstand voltage of 3kV AC. The CUS250LD series is available with nominal output voltages of 3.3V, 4.2V, 5V, 12V, or 24V DC, all of which have a +/-10 per cent user adjustment range.

These power supplies have a convection cooled operating temperature range from -25degC to +70degC with derating above +40degC. The power-saving efficiency is up to 90 per cent. Other standard features include overvoltage and overcurrent protection plus a green LED indicator that is lit when the supply is on.

TDK’s CUS250LD series features global ITE and general purpose safety agency certifications according to UL/CSA/EN60950-1. CE marked in accordance with the LV Directive and RoHS Directive, the power supplies conform to EN55022-B and FCC Class B for conducted and radiated EMI and include a 3-year warranty.

For more information about the TDK-Lambda CUS250LD power supplies, please visit the TDK-Lambda website at

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