Magnetic Sensors - Linear, Compass (ICs)

Image	Part Number	Description / PDF	Quantity	Rfq
	A1322LUA-T Allegro MicroSystems	SENSOR HALL EFFECT ANALOG 3SIP	0
	A1392SEHLX-T Allegro MicroSystems	SENSOR HALL ANALOG 6MLP/DFN	0
	A1322LLHLT-T Allegro MicroSystems	SENSOR HALL EFFECT ANALOG SOT23W	0
	A1374LKB Allegro MicroSystems	SENSOR HALL EFFECT ANALOG 3SIP	0
	A1301ELHLT-T Allegro MicroSystems	SENSOR HALL EFFECT ANALOG SOT23W	0
	A1321EUA-T Allegro MicroSystems	SENSOR HALL EFFECT ANALOG 3SIP	0
	ZMY20TA Zetex Semiconductors (Diodes Inc.)	SENSOR MR ANALOG SOT23-3	0
	A1302KUA-T Allegro MicroSystems	SENSOR HALL EFFECT ANALOG 3SIP	0
	MLX90395KLW-BBA-000-SP Melexis	SENSOR MAGNETOMETER 3DXYZ 16QFN	0
	MLX90242ESE-GDA-000-RE Melexis	SENSOR HALL ANALOG TSOT23-3	0
	A1302KLHLT-T Allegro MicroSystems	SENSOR HALL EFFECT ANALOG SOT23W	0
	A1382LLHLT-T Allegro MicroSystems	SENSOR HALL EFFECT ANALOG SOT23W	0
	SS491B Honeywell Sensing and Productivity Solutions	SENSOR HALL EFFECT ANALOG TO92-3	0
	TLE4998C8XUMA1 IR (Infineon Technologies)	SENSOR HALL OPEN DRAIN/PWM TDSO8	0
	HMC5983-T Honeywell Aerospace	SENSOR MR I2C/SPI 16LPCC	0
	MX8681RTR Wickmann / Littelfuse	SENSOR HALL EFFECT SPI 8DFN	0
	HMC1002 Honeywell Aerospace	SENSOR MR WHEAT BRDG 20SOIC	0
	A1302KLHLX-T Allegro MicroSystems	SENSOR HALL EFFECT ANALOG SOT23W	0
	A1382ELHLX-T Allegro MicroSystems	SENSOR HALL EFFECT ANALOG SOT23W	0
	A1362LKTTN-T Allegro MicroSystems	SENSOR HALL EFFECT ANALOG 4SIP	0

Magnetic Sensors - Linear, Compass (ICs)

1. Overview

Magnetic sensors - linear compass ICs are semiconductor devices that detect magnetic fields and convert them into electrical signals. These integrated circuits provide precise measurement of magnetic field direction and strength in linear axes, enabling 2D/3D orientation detection. Their importance spans multiple industries due to their ability to provide contactless position sensing, navigation capabilities, and magnetic field monitoring in compact form factors.

2. Main Types & Functional Classification

Type	Functional Features	Application Examples
Hall Effect Sensors	Voltage output proportional to magnetic field strength, simple design	Current sensing, proximity detection
Anisotropic Magnetoresistance (AMR) Sensors	High sensitivity (0.1 accuracy), low power consumption	Electronic compasses, navigation systems
Giant Magnetoresistance (GMR) Sensors	Ultra-high sensitivity (nanotesla range), wide bandwidth	Biomedical devices, industrial position control
Tunneling Magnetoresistance (TMR) Sensors	Lowest power consumption, excellent thermal stability	IoT devices, automotive safety systems

3. Structure & Composition

Typical construction includes: - Sensing element (Hall plate/AMR film/TMR junction) - Signal conditioning circuitry (amplifiers, ADCs) - Temperature compensation modules - Digital interface (I2C/SPI) Packaged in LGA/QFN formats (2-8mm sizes) with magnetic shielding layers. Advanced versions integrate sensor fusion algorithms for 3-axis measurement.

4. Key Technical Specifications

Parameter	Description & Importance
Sensitivity (mV/Gauss)	Determines minimum detectable field strength
Resolution ( T/LSB)	Affects angle measurement precision (critical for navigation)
Operating Temperature (-40 to +125 C)	Defines environmental suitability
Power Consumption ( A/mA)	Crucial for battery-powered devices
Interface Type	I2C/SPI for digital output, analog for raw signals

5. Application Fields

Main industries include: - Consumer Electronics: Smartphone compasses, AR/VR headsets - Automotive: EPS systems, vehicle detection - Industrial: Robotics, CNC machine tool positioning - Aerospace: Drone stabilization systems - Medical: Surgical tool tracking

6. Leading Manufacturers & Products

Manufacturer	Product Series	Key Specifications
STMicroelectronics	LIS3MDL	50 Gauss range, 0.08 T/LSB, I2C/SPI
Honeywell	HMC5883L	80 Hz bandwidth, 2-4 Gauss accuracy
NXP Semiconductors	MFX7755	3D sensing, 0.1 heading accuracy
TDK-InvenSense	ICM-20948	9-axis MEMS+mag, 0.15 mA operating current

7. Selection Guidelines

Key consideration factors: - Required measurement axis (2D vs 3D) - Environmental conditions (temperature, vibration) - Power budget constraints - Required accuracy vs cost trade-offs - Interface compatibility with host system - Calibration requirements (hard/soft iron compensation)

8. Industry Trends

Current development directions: - Integration with MEMS IMUs for sensor fusion - AI-based self-calibration algorithms - Sub-10 A ultra-low power consumption - Increased radiation hardness for space applications - Development of 4D magnetic field-time sensors