Magnetics Business & Technology - March/April 2025 - 7

FEATURE ARTICLE
sures the magnetic field generated by the current and outputs a
voltage proportional to that magnetic field. Some magnetic current
sensors are placed close to a current- carrying wire while others
integrate a conductor path inside the component for ease of implementation.
A
magnetic current sensor can provide significant advantages over
sense resistors and current transformers in automotive power systems.
Compared to a sense resistor, the magnetic current sensor
offers a smaller size, lower power dissipation, and higher bandwidth
with integrated isolation. Advantages of magnetic current
sensors over current transformers are smaller size, DC measurement,
and minimal external components.
New ICs from Allegro
In January, Allego launched two new current sensor ICs that leverage
its sensing technology. Depicted on page 6, the ACS37030MY
and the ACS37220MZ provide low internal conductor resistance,
high operating bandwidth and reliable performance across a wide
range of automotive, industrial and consumer applications.
" We're excited to introduce our latest current sensor ICs, as Allegro
continues to push the boundaries of sensor IC technology, "
said Ram Sathappan, Vice President of Global Marketing and Applications.
" Our newest sensors establish new standards for precision
and reliability, empowering customers to overcome design
and efficiency standards, while also demonstrating how our technology
is driving a smarter, more efficient future. "
They are designed for precise current sensing in a compact and
durable package. Featuring a widebody design, the ACS37030MY
and ACS37220MZ deliver higher isolation in a 40% smaller footprint
compared to the existing 16-pin packages on the market. The
innovative new designs also incorporate lower resistance, which
helps to reduce power dissipation.
The ACS37030MY is a fully integrated current sensor IC with fast
response time for protection of wide bandgap GaN devices. It
uses a combination of Hall-effect and inductive coil signal paths to
sense current over a wide frequency range. The innovative package
offering enables a product which is both 5x faster than existing
solutions but also 40% smaller.
The ACS37220MZ fully-integrated, Hall-effect current sensor features
a 150 kHz bandwidth and fault pin. This device is designed
for value-line current sensing applications as a successor to the
popular ACS724/5 family of products. The new package of the ACS37220MZ
offers a 40% smaller solution size and lower resistance
for lower power dissipation.
Additionally, Allegro has recently expanded its portfolio with new
XtremeSense TMR sensors that use tunnel magnetoresistance
technology to provide the high magnetic sensitivity, low power consumption
and small size by comparison to other magnetic technologies
such as Hall effect, anistropic magnetoresistance (AMR) and
giant magnetoresistance (GMR). Accelerating various applications
from renewable energy systems, xEV and connected consumer
devices, the TMR technology enables current and position sensors
to achieve industry-leading performance figures and cost levels,
says Allegro.
A thin-film magneto-resistive device called a Magnetic Tunnel
Junction is central to the technology. In its simplest form, the MTJ
consists of two electric-conducting magnetic layers on either side
of a thin but highly robust insulating layer. One magnetic layer has
a fixed magnetic moment direction, while the other can change
freely to follow the direction of the local magnetic field.
New current sensors from Multidimension Technology
TMR7616-C series from MDT
MultiDimension Technology, a leading manufacturer of magnetic
sensors specializing in TMR technology, has recently added several
current sensors to its extensive portfolio. As previously reported
in Magnetics Magazine, the TMR7616-C series current sensor
IC provides TMR performance in a compact SOPW16 form factor.
It is highly sensitive, featuring a sophisticated design built upon
electromagnetic induction principles. Its high signal-to-noise ratio
ensures precise current measurements.
Another recent development from MDT is its TMR7303 high-bandwidth
board-mounted current sensors that are designed to meet
the growing market demand for high-frequency current detection in
silicon-carbide (SiC) / gallium-nitride (GaN) power electronics devices
in application systems including photovoltaic inverters, switching
power supplies, DC motor drives, and variable frequency drives.
www.MagneticsMag.com
Continued on page 8...
March/April 2025 * Magnetics Business & Technology 7
http://www.MagneticsMag.com
Magnetics Business & Technology - March/April 2025

Table of Contents for the Digital Edition of Magnetics Business & Technology - March/April 2025
