August 13, 2024 Electrifying  News  From  NVE In This Issue Ultraminiature TMR Magnetometers Application Corner Quick Links Sensor Selector Guide Isolator Cross Reference Online Store Contact Us Twitter YouTube New on YouTube Tuning a harp with TMR Smart Magnetometer Music Box World’s Fastest Isolators—Newly Upgraded to 7 kV Isolation TMR over-trace current sensor eval boards Current sensor breakout boards GMR sensor breakout boards Expanded Line of TMR Magnetometers Recent and Upcoming Papers on NVE Magnetometers “Commercial Chip-based Tunneling Magnetoresistance Sensor for Green-synthesized Magnetic Nanoparticles Assay” (an ALT025-10E TMR sensor detects magnetic nanoparticles in a biosensor system.) Journal Pre-proof, Sensors International, July 28, 2024. Try the ALT025 breakout board » “Exploring Biomagnetism for Inclusive Vital Sign Monitoring: Modeling and Implementation.” (an AA004 sensor is used to detect heartrate and respiration in a smartwatch.) To be presented at the International Conference on Mobile Computing and Networking, Oct. 2024. Try the AA004 breakout board » More Independent Papers About NVE Sensors » Ultraminiature TMR Magnetometers   NVE has expanded its industry-leading line of ALT-Series Tunneling Magnetoresistance (TMR) analog magnetometers with the new ALT002-14E.     NVE’s DFN4 sensors fit on the head of a pin. Ultraminiature The new version is the second TMR magnetometer in our unique 1.1 x 1.1 mm DFN4 package. High Sensitivity for Low-Field Applications Designed for low-field applications, the ALT002-14E has a remarkable sensitivity of 200 mV/V/mT providing a typical output of 250 millivolts at 0.25 mT with a five-volt supply and no amplification. Simple Interface These ultraminiature sensors have just four connections, two for the output and two for power. The output can be connected directly to ADC or microcontroller analog inputs, or simple amplifiers if necessary.   Best-in-Class Specifications   • High sensitivity (up to 500 mV/V/mT)   • Large signals (200 mV/V typical full-scale)   • Flexible 0 to 10 V supply (no minimum)   • 20 kiloohm device resistance for low power   • High linearity (0.2% typ.)   • Ultra-low output temperature coefficient (±0.1%/°C)   • Up to 300 kHz bandwidth   • –40 to 125 °C operating range   • 2.5 x 2.5 mm DFN6 and     1.1 x 1.1 mm DFN4 packages Applications   • Proximity sensing   • Wearables   • Motion, speed, and position control   • Noncontact current sensing   • Ferromagnetic material detection   • Geomagnetic navigation   • Mechatronics and robotics Breakout Boards The 0.8 x 0.4 inch (21 x 10 mm) ALT-Series breakout boards have pre-soldered sensors, standard 0.1" (2.54 mm) headers, and 1 mm pitch card-edge connectors. Seven Versions There are now seven ALT-Series TMR magnetometer versions, including two in the 1.1 x 1.1 mm package:      Part No.    (click for more information)  Breakout Board   Sensitivity  (mV/V/mT) Linear  Range  (mT)  Package  [NEW!] ALT002-14E ALT002-14E-EVB01 200 0 to 0.25 1.1 x 1.1 mm ALT026-10E ALT026-10E-EVB01 4.5 0 to 20 2.5 x 2.5 mm ALT025-10E ALT025-10E-EVB01 8 0 to 10 ALT025-14E ALT025-14E-EVB01 22.5 1.1 x 1.1 mm [NEW!] ALT024-10E ALT024-10E-EVB01 120 0 to 2 2.5 x 2.5 mm ALT023-10E ALT023-10E-EVB01 200 0 to 1 ALT021-10E ALT021-10E-EVB01 500 0 to 0.25   Wide Sensing Range The expanded ALT-Series covers a wide range of magnetic fields: Demonstration Video This video shows a new ALT002 magnetometer detecting string vibration of a lap harp:   In Stock All ALT-Series part types are in stock for immediate delivery.     Download the ALT-Series Datasheet »   Differential Amplifier for ALT-Series Sensors   The circuit below uses a single-supply op amp. The NCV2001 op amp has a wide bandwidth and can run on as low as a 0.8-volt supply, allowing operation on a 1.5-volt battery:     A nanopower op amp such as an MCP6441 can be used for low-power applications. In addition to low power, the MCP6441 has a low gain-bandwidth product, which could eliminate the need for low-pass filtering in some applications.