A1123LLHLX-T

Series:	Automotive, AEC-Q100
Packaging:	Tape & Reel (TR)
Part Status:	Active
Function:	Unipolar Switch
Technology:	Hall Effect
Polarization:	South Pole
Sensing Range:	35.5mT Trip, 15mT Release
Test Condition:	-40°C ~ 85°C
Voltage - Supply:	3 V ~ 24 V
Current - Supply (Max):	4mA
Current - Output (Max):	25mA
Output Type:	Open Drain
Features:	--
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	SOT-23W
Supplier Device Package:	SOT-23W

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Magnetic Sensors - Switches (Solid State)

A1123LLHLX-T is a magnetic solid-state switch belonging to a wide range of magnetic sensor products. It is widely used in automotive, white goods, consumer products, medical, and industrial control applications. A single device provides low-cost protection against power surges, electrical noise interference, and power loss.

Application Field

The A1123LLHLX-T offers a programmable Hall effect switch with a variety of options in terms of sensitivity, size, power supply voltage, AC/DC switching, and adjustable response characteristics. This user-friendly device can switch loads, control systems, and sense the presence of a magnetic field. Applications of this switch include motor control, magnetic sensing, position sensing, speed sensing, and drive motor current sensing. In automotive applications, the A1123LLHLX-T can be used for airbag deployment, seatbelt retraction, fuel control, door locks, and differential speed sensors. In industrial and residential applications, the switch can be used in home appliance motor controllers, heating or cooling controllers, lighting controls, CB radios, and air conditioning systems.

Working Principle

The A1123LLHLX-T works on the principles of Hall effect. When a current passes through a conductor placed perpendicular to a magnetic field, a voltage difference will be generated perpendicular to both the current and magnetic field due to the Lorentz force. This is known as the Hall effect. The A1123LLHLX-T uses an integrated Hall effect switch that is sensitive to a predetermined strength of magnetic field. The strength of the magnetic field varies as a function of the distance between the switch and the magnet. When the magnetic field is strong enough to reach the switching threshold, the switch outputs a high signal and will otherwise remain in a low.

Features

The A1123LLHLX-T offers a wide range of features designed to enhance its practical use in various applications. It has an adjustable sensitivity over a range of one hundred to two thousand gauss, a low-power consumption, a wide operating temperature range of -40°C to +125°C, and a 10K dielectric strength for maximum protection. The device is also provided with a latching option which ensures a maintained contact until the magnet moves away further than the latching distance. It also offers a variety of output options, including digital on/off and Isolated Digital Output, as well as an adjustable pulse width modulation, a feature which controls the output frequency and duration of the signal.

Conclusion

The A1123LLHLX-T is a powerful and reliable magnetic solid-state switch that is suitable for a wide variety of applications. It has a low-power consumption, strong dielectric strength, and an adjustable sensitivity over a wide range of magnetic field strengths. Adjustable pulse width modulation allows for control of the output frequency and duration of the signal, while the latching option ensures a maintained contact until the magnet moves away further than the latching distance.

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