NVE GT Sensors are designed for detection of gear teeth and magnetic encoder wheels in industrial speed sensing. The sensors are used with back-biasing magnets to detect the position and motion of ferromagnetic gears and other ferrous teeth structures. The two most common sensing configurations are shown below.

ABT-Series TMR GT sensors use state-of-the-art Tunneling MagnetoResistance to detect the exact positions of gear teeth for rotary encoder applications. The high-linearity, low-noise sensor elements enable highly accurate rotation detection and resolution to thousandths of a degree. ABT-Series TMR GT sensors have dual-channel, phase-shifted analog outputs for fine sine/cosine interpolation or simple speed and direction detection.

ABL- and AKL-Series GMR GT sensors use high-sensitivity, low-hysteresis Giant MagnetoResistance to detect even the smallest gear teeth and to provide a 50% duty cycle output with wide airgap and temperature tolerances. GMR GT Sensors are available with analog or digital outputs. Dual-output versions are available with the second output phase shifted with respect to the first for quadrature to determine direction.

Unlike other magnetic sensing technologies, NVE's GMR sensors withstand extremely large magnetic fields.

MSOP8, TDFN SO8, and TDFN6 packages allow GT Sensors to fit in the tightest spaces. An evaluation kit (AG920) is available with a variety of sensors, magnets, and PCBs. Two demonstration boards (AG921, AG972) allow you to experiment with sensor-gear airgap and maximum rotation-sensing resolution.

ABT-Series TMR GT sensors have differential sensor elements that provide sinusoidal outputs. Four standard spacings are available for use with common fine and coarse pitches. Dual bridge outputs generate sine and cosine outputs to provide absolute position information:

ABT-Series TMR Gear-Tooth Sensors
Part Number	Single or Dual Bridge	Element Spacing (mm)	Package
ABT250-00E	Dual	0.25	MSOP8
ABT375-00E	Dual	0.375	MSOP8
ABT500-00E	Dual	0.5	MSOP8
ABT600-00E	Dual	0.6	MSOP8

ABTxxx Gear-Tooth Sensor Output

ABT-Series Datasheet

ABL and AKL-Series GMR GT sensors are versatile, wide air gap gear-tooth sensors.

ABL-Series analog sensors have differential sensor elements that provide sinusoidal outputs. Three standard spacings are available for use with fine and coarse pitches. Single- or double-bridge configurations are available. Double bridges generate sine and cosine outputs to provide direction information:

ABL-Series Analog Gear-Tooth Sensors
Part Number	Single or Dual Bridge	Element Spacing (mm)	Package
ABL004-00E	Single	1	MSOP8
ABL005-00E	Single	0.5	MSOP8
ABL006-00E	Single	0.3	MSOP8
ABL014-00E	Dual	1	MSOP8
ABL015-00E	Dual	0.5	MSOP8
ABL016-00E	Dual	0.3	MSOP8
ABL004-10E	Single	1	TDFN6
ABL005-10E	Single	0.5	TDFN6
ABL006-10E	Single	0.3	TDFN6
ABL014-10E	Dual	1	TDFN6
ABL015-10E	Dual	0.5	TDFN6
ABL016-10E	Dual	0.3	TDFN6

ABL00x Gear-Tooth Sensor Output

ABL01x Gear-Tooth Sensor Output

ABL/AKL-Series Datasheet

AKL-Series digital sensors are configured as two-wire devices, where the supply current indicates a passing tooth. Three AKL-Series parts are available: the AKL001-12 is designed for gear teeth or encoders with a pitch of 2.5 to 6 mm, the AKL002-12 for a pitch of 1 to 2.5 mm, and the AKL003-12 for a pitch of 0.6 to 1.5 mm:

AKL-Series Digital Gear-Tooth Sensors
Part Number	Single or Dual Bridge	Element Spacing (mm)	Package
AKL001-12E	Single	1	TDFN8
AKL002-12E	Single	0.5	TDFN8
AKL003-12E	Single	0.3	TDFN8

Digital Gear-Tooth Sensor Output

ABL/AKL-Series Datasheet