ROHM Introduces BM14270MUV‑LB: Industry’s Smallest Contactless Current Sensor with Ultra‑Low Power Loss

ROHM has announced the launch of its BM14270MUV‑LB, the world’s smallest contactless current sensor. By delivering zero power loss and no heat generation in an ultra‑compact footprint, it’s a perfect fit for industrial equipment and consumer devices that rely on current‑based monitoring—such as battery‑powered drones, solar‑inverters, and high‑power data‑center servers.

As global energy‑efficiency standards tighten, the need for precise, low‑loss current measurement in high‑power applications has surged. Traditional Hall‑effect sensors consume significant current and offer limited sensitivity, which forces designers to draw power through the sensing element itself. Until now, no product combined high reliability, minimal loss, and a compact form factor.

The BM14270MUV‑LB leverages a high‑sensitivity, low‑current magneto‑impedance (MI) element from Aichi Steel, coupled with ROHM’s leading semiconductor and sensor‑control expertise. The result is a truly contactless sensor that requires no current draw to measure. With an input current of just 0.07 mA—over 100 × lower than conventional solutions—and an active area of 3.5 mm², the module is the industry’s smallest. A built‑in magnetic‑field‑cancellation feature protects against external noise, eliminating the need for bulky shielding. The integrated A/D converter outputs digital data, lightening the load on microcontrollers and simplifying current‑monitoring integration.

These capabilities enable reliable, low‑power current sensing across a broad spectrum of applications, from lightweight, battery‑powered gadgets to high‑power industrial machinery.