NVE Corporation Product Announcement

NVE Launches AHK991 High-Field TMR Magnetic Switch

EDEN PRAIRIE, Minn.—December 9, 2019—NVE Corporation today announced it is launching the unique AHK991-14E high-field, low voltage, low power, Tunneling Magnetoresistance (TMR) magnetic switch.

High Fields
The new sensors have a 350 millitesla (3500 oersted) typical operate point, which is high enough to detect MRI fields or strong, rare-earth magnets in close proximity that disrupt lower-field sensors. The sensors can withstand unlimited fields without being damaged or turning off.

The digital output turns on and off as field intensity varies. Unlike Hall effect or other sensors, the switch is sensitive to magnetic fields in any direction, so multiple sensors are not needed for orthogonal or unknown directions of applied fields.

Low Voltage
AHK991 sensors operate as low as 0.9 volts, so they can be powered by single-cell alkaline batteries.

Low Power
TMR technology provides ultralow power. Typical AHK991 quiescent supply current is just 2 microamps, even with no duty cycling. That's less than the self-discharge rate of some button cells, making the new sensors ideal for battery applications such as utility meters or portable instruments.

Configured as Switches
Outputs are configured as magnetic "switches," turning on when a magnetic field is applied and off when the field is removed. The magnetic operate point is extremely stable over supply voltage and temperature.

Continuous operation without duty cycling means the sensors can switch at 3000 Hz.

AHK991 Sensors fit on the head of a pin
AHK991 sensors come in ultraminiature 1.1 x 1.1 x 0.35 mm ULLGA-4 packages.

Key Specifications
  • 350 mT operate point
  • 0.9 to 1.8 V
  • 2 µA typical supply current
  • 3000 Hz switching speed
  • -40 to 85°C

Available Now
AHK921-14E sensors are are in stock for immediate delivery, and priced at $3.83 each in 1000-piece quantities.

Click here to download the AHK921 datasheet, or visit www.nve.com for more information.

Leaders in Practical Spintronics
NVE is a leader in the practical commercialization of spintronics, a nanotechnology that relies on electron spin rather than electron charge to acquire, store and transmit information. The company manufactures high-performance spintronic products including sensors and couplers that are used to acquire and transmit data.

Statements used in this announcement that relate to future plans, events, or performance are forward-looking statements that are subject to certain risks and uncertainties including, among others the risk factors listed from time to time in our filings with the SEC, including our Annual Report on Form 10-K and other reports filed with the SEC.