Current Sense Transformers Rated for up to 40A

Wurth Electronics Midcom announced the release of additional current sense transformers to the MID-SNS family. These low-profile EE13/7/4 transformers have a sensed current capability up to 40A.

Expected applications include; industrial switch mode power supplies, precise current measurement, feedback control, circuit protection and monitoring, and high-reliability equipment.

"These surface mount transformers are designed to operate between 50kHz to 500kHz and sense up to 40A of current. The turns ratios offered are 1:50, 1:100, 1:150 and 1:200 with inductances ranging from 1.4mH to 22.4mH," explained Swaroop Vaidyanath, Product Manager at Wurth Electronics Midcom.

"Compared to current sense resistors, these parts have much lower power dissipation and provide galvanic isolation," Vaidyanath added.

These 40A MID-SNS transformers are built on a compact platform with a footprint of 14.48mm x 20.2mm and low profile height of 10.5mm. These parts have low primary dc resistance and meet 1500Vrms dielectric between the primary and secondary windings. These transformers have an operating temperature of -40°C to 125°C and are RoHS and REACH compliant.


  • Different turns ratio options
  • Low profile height of 10.5mm
  • Low primary DCR
  • 50kHz to 500kHz operation
  • Sensed current up to 40A
  • Surface mount
  • Functional insulation
  • Isolation voltage: 1500Vac at 2 seconds
  • Lead free and RoHS compliant
  • Operating temp: -40°C to 125°C
Wurth Electronics Midcom
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