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Linear Hall Effect Sensor IC - KTH31XX Series
2026.07.10
3 次
KTH31XX KTH3101 KTH3102 KTH3103 KTH3105 Sensor IC
KTH31XX






Linear Hall Effect Sensor IC - KTH31XX Series

（KTH3101/KTH3102/KTH3103/KTH3105/KTH3110/KTH3113）



Product Introduction

01



Why Choose Linear Hall Sensors – Core Positioning of KTH31XX

KTH31XX (KTH3101/KTH3102/KTH3103/KTH3105/KTH3110/KTH3113) is a proportional linear Hall effect magnetic sensor IC. It linearly converts magnetic field strength into analog voltage output and can identify both North and South magnetic poles. Featuring non-contact measurement with zero mechanical wear, it serves as an ideal replacement for traditional mechanical detection components, and meets full-range magnetic field acquisition requirements including current sensing, displacement detection, vibration monitoring, weight measurement and rotational speed measurement.


Output Characteristic Curve


Precise quiescent midpoint voltage of VDD/2 output with no magnetic field applied:

  • When the South pole approaches the chip: Output > VDD/2

  • When the North pole approaches the chip: Output < VDD/2

A single chip is able to distinguish magnetic polarities and magnetic field intensity, greatly simplifying post-stage circuit design.


02


Six Core Powerful Advantages with Clear Parameters at a Glance


✅ 1. Wide Voltage & Low Power Consumption, Compatible with Various Power Supply SystemsOperating voltage ranges from 3.0V to 5.5V, compatible with mainstream 3.3V and 5V hardware platforms.Quiescent current consumption: only 4.5mA under 3.3V supply and merely 5.4mA under 5V supply, delivering low heat generation during long-term operation.
✅ 2. 30kHz High-Speed Bandwidth, Zero Latency for High-Speed Dynamic DetectionBoasting a response bandwidth up to 30kHz, it ensures no signal loss in applications such as rotary encoders, high-speed motor commutation and high-frequency vibration acquisition, with far superior dynamic response compared to ordinary linear Hall sensors.
✅ 3. Rail-to-Rail Low-Noise Analog Output for Clean, Easy Signal AcquisitionLinear output range: 0.25V ~ VDD-0.25V for maximized dynamic range.It integrates a low-noise amplifier circuit. Combined with RC filtering, output noise can be further suppressed to improve ADC sampling accuracy. Standard RC filter solutions are officially provided for direct implementation to reduce noise and match bandwidth requirements.
✅ 4. Six Standard Sensitivity Grades Covering Weak and Strong Magnetic Field ScenariosTwo sets of standardized sensitivity parameters for 3.3V and 5V supplies fully cover weak to strong magnetic field environments, enabling flexible model selection without extra matching magnetic steel.


✅ 5. Industrial-Grade Wide-Temperature Stability with Reliable Linearity Across Full Temperature RangeOperating temperature range: -40℃ ~ 125℃. The sensitivity temperature drift is only 0.1%/℃ under high and low temperature conditions, and the linear error is controlled within ±1.5%. It maintains long-term stable performance without drift for outdoor equipment, industrial electronic control systems and motors operating in high-temperature environments.
✅ 6. Three Package Options Compatible with SMD and Through-Hole Production LinesThe entire series adopts unified 3-pin definitions differing only by package type with fully interchangeable pin functions for direct replacement:

  • SOT23 (SS3): Miniature surface-mount package, 3000 pieces per reel. Ideal for consumer electronics and compact PCB layout designs.

  • DFN1616 (DN16): Ultra-small surface-mount package specially designed for portable devices and miniature sensor modules.

  • TO-92S (TO3): Through-hole package, 1000 pieces per bag, featuring convenient soldering for industrial control and wiring harness products.

Unified pin assignment: Pin 1-VDD Power Supply / Pin 2-OUT Analog Output / Pin 3-GND Ground. Shared schematic design cuts PCB revision costs.







03


Typical Application Scenarios Covering Full-Sector Demands


Output Characteristics (TA=-40℃~125℃, VDD=3.0V~5.5V)

Industrial Automation

Closed-loop motor control, position detection for brushless motorsRotary encoders, rotational speed measurementProximity switches, displacement & angle measurementVibration sensing, weight and pressure signal acquisition

New Energy & Current Detection

Busbar current sampling, battery balancing current monitoring, charging pile current acquisition

Consumer Electronics & Smart Home


Liquid level sensors, knob angle detection, magnetic triggers for joysticks, miniature motor positioning

Instruments & Meters

Magnetic force measurement, micro-deformation detection, portable magnetic testing equipment



04


Key Electrical & Magnetic Performance Highlights (For Engineers' Primary Reference)


  1. Accurate Quiescent Midpoint Voltage: Outputs 1.65V with zero magnetic field at 3.3V supply and 2.5V at 5V supply. Temperature drift is controlled within ±1% VDD, eliminating the need for zero-point calibration circuits.
  2. Maximum Magnetic Field Range: Up to ±1400Gs at 3.3V and ±1500Gs at 5V, free from saturation distortion under strong magnetic fields.
  3. ESD Protection: HBM 5kV rating delivers robust anti-static performance during mass production soldering and on-site application.
  4. Fast Power-Up Response: Typical stabilization time of 20μs after power-on, with no signal delay at startup.
  5. RoHS Compliant: Meets global environmental standards for electronics, hassle-free for export equipment.


05


Ultra-Simplified Typical Application Circuit, Ready for Direct Use


The IC only has 3 pins with minimal peripheral circuitry: VDD connects to power supply, GND to ground, and OUT outputs analog voltage directly.
If noise reduction is required, add an RC filter network at the output terminal. Three sets of mature RC parameter combinations are officially provided to balance noise and bandwidth without repeated debugging.



06


Ordering & Selection Guide for Fast Model Matching


KTH31XX - Package Abbreviation


XX = Sensitivity Grade;
Package Codes:SS3 = SOT23DN16 = DFN1616TO3 = TO-92S
Example: KTH3110-SS3 = High sensitivity of 6.6mV/Gs, SOT23 SMD package
Quick Selection Recommendations:Long detection distance / Large magnetic steel→ KTH3101/02 (Low sensitivity, wide measuring range)
General displacement measurement & motor control→ KTH3103/05 (Balanced cost performance)
Precise detection for tiny stroke & weak magnetic fields→ KTH3110/13 (High sensitivity, narrow measuring range & high precision)
SOT23 for mass SMD production;DFN1616 for mini sensor modules;TO-92S for through-hole industrial control applications
The KTH31XX series linear Hall effect sensors integrate five core strengths: high precision, wide operating temperature range, fast response speed, multiple package options and various sensitivity grades. They serve as an all-in-one solution for magnetic field detection demands across consumer electronics, industrial control, new energy and instrumentation sectors.Free samples are available for testing, with stable lead time for bulk orders. Customized technical support and application scheme design are also provided.
Feel free to contact us via message if you need datasheets, sample application or technical consultation!



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