Si8540 High-Side DC Current Sensor

Si8540 devices are non-isolated, unidirectional high voltage high-side current sense amplifiers for use in power management applications requiring current monitoring and current control loops, such as portable PCs, cellular infrastructure equipment, high-end routers, smart battery packs, and automotive applications. The Si8540 is an extremely cost-effective and flexible current sensor in a compact 5-pin SOT-23 package.

Our high-side DC current sensors measure the voltage drop across a sense resistor in the high voltage side of a line. Large values of current can be measured by using a small resistor value and keeping the series voltage drop low across the sense resistor. The Si8540 operates from a single supply +5 to +36 V and has a current output that can be converted to a ground referenced voltage with a resistor ROUT. The amplification factor of the current sense can be adjusted with a choice of external resistor ratios.

Compact package
5 pin SOT-23
Wide Supply Voltage
5 V to 36 V

Common Specs

  • +5 to +36 V supply operation
  • 0.2% full scale accuracy
  • 90 μA max supply current
  • 9 μA shutdown current
  • -40 to +85 ºC


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Part Number Package Type Vcm (V) Icc (max) Bidirectional

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