In
This Issue
• Sub-Microtesla
Magnetic Sensing
• Tariffs
• In the News
• NVE's Strong Growth
• Sensors Converge
Sub-Microtesla Magnetic Sensing
NVE's ALT-Series
Tunneling Magnetoresistance (TMR) analog magnetic sensors provide industry-leading
sensitivity. They are also easy amplified for sub-microtesla sensing.
High Sensitivity
The ALT021 has a remarkable sensitivity of 500 mV/V/mT with no amplification,
making it the most sensitive magnetic field sensor of its type. Two popular, easy
ways to get even higher sensitivity are op-amp amplifiers and microprocessors
with preamps.
Op-Amp Amplifier
Expensive instrumentation amplifiers generally aren't necessary. Here's a reference
design for a 5x amplifier with a low-cost op-amp:
The output is centered at half the supply with no field. Large resistors prevent
sensor loading, and optional filter capacitors can be used to limit high-frequency
noise.
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You can buy a demo
board with the sensor and amplifier circuitry from our website
or build it yourself. The board provides a 2.5 V/V/mT single-ended linear
output, and can be powered by a 0.9 to seven-volt supply or battery.
Microprocessors with Preamps
Low-cost microprocessors like the ATmega32U4 in an Arduino MICRO can also be used
to amplify ALT-Series sensors (email us
for the code). For example in the video demonstration below, we set the microprocessor’s
internal preamp to 40x. With just the 10-bit ADC, the resolution is a remarkable
0.1 microtesla. And that isn’t just noise, since 0.1 microtesla is the sensor’s
detectivity spec.
This video demonstrates both of these methods of sub-microtesla magnetic sensing:
Download
the Datasheet »
Good News on Tariffs
 Good
news: Unlike those ominous warnings you’ve seen from other companies, NVE
anticipates no impact on part availability from tariffs. Our unique self-sufficiency,
featuring an in-house spintronics fab, internal backend testing, and minimal reliance
on imported raw materials, ensures a stable supply.
With substantial inventories of popular parts, most orders ship directly from
stock. Visit our Online Store to check
stock and place your order. Buy our award-winning sensors and isolators directly
from us with no minimum order or handling fees. Expect shipment within one business
day and flat-rate shipping.
In the News
 NVE's
new ALT521-10E ultrasensitive
rotation sensor and ALT002-14E
ultrasensitive magnetic sensor are highlighted in a full-page article in the May/June
edition of Magnetics Magazine. Both TMR sensors are the most sensitive
devices of their type.
Read
the Article »
NVE's Strong Growth
 NVE
reported sales increased 44% sequentially in the most recent quarter, ended March 31,
2025.
Thanks to all of our customers--especially new customers--for making this growth
possible!
Sensors Converge
 See
our industry-leading line of magnetic switches, and current, angle, and position
sensors at Sensors
Converge, June 24 to 26 in Santa Clara, Calif. |
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