Coilcraft Introduces New SMT Current Sense Transformers

Mar24_CoilcraftCoilcraft has launched its new CST2010 series of current sense transformers. The devices detect switching current up to 40 amps over a frequency range of 50 to 500 kHz while also isolating circuits electrically, resulting in up to 10X lower power dissipation than current sense resistors. This makes them well suited for switched-mode power supply applications, including feedback control, overload detection and load drop/shut down detection.

The compact, surface mount CST2010 series has a 14.55 by 19.91 mm footprint with a maximum height of 10.50 mm. Coilcraft offers 11 turns ratios (primary-to-secondary) within the series ranging from 1:20 to 1:200. The CST2010 series also offers 500 Vrms isolation between windings and very low primary DC resistance (0.00036 Ohms). It features RoHS compliant tin-silver, over tin, over nickel, over phos bronze terminations and has an ambient temperature rating of -40°C to 125°C.

As with all Coilcraft parts, free evaluation samples are available online at