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A3144EUA
LMDS18B20 is a popular one‑wire digital temperature sensor from Maxim. It only needs one data line to complete communication with microcontroller, greatly saving IO resource. Multiple DS18B20 sensors can be mounted on the same bus, each chip has unique 64‑bit ROM address for individual access.
Temperature resolution can be configured from 9‑bit to 12‑bit; 12‑bit mode gives 0.0625 °C step value. It supports two power supply modes: external 3.0V‑5.5V power supply or parasitic power supply powered by data bus without extra power wire.
Package is TO‑92 through‑hole, easy for breadboard experiment. Operating temperature range: ‑55 °C ~ +125 °C. Built‑in user‑configurable upper and lower temperature alarm trigger registers.
Typical applications include industrial equipment temperature monitoring, greenhouse temperature collection, water tempA3144EUA is widely‑used unipolar Hall‑effect switch sensor. It integrates Hall element, voltage regulator, amplifier and Schmitt trigger inside the chip. Only triggered by S‑pole magnetic field; output pulls low when magnetic flux exceeds operating point, returns high when magnetic field weakens. Open‑collector output requires external pull‑up resistor for normal operation.
Wide supply voltage from 3.8V to 40V, supports industrial‑grade temperature range ‑40℃ to +125℃. Features reverse‑voltage protection and temperature compensation circuit, enhances stability under complex working conditions. Typical operating current is 6mA, sink output current up to 40mAxonstorage....
Pin definition: Pin1 VCC, Pin2 GND, Pin3 Output. Non‑contact magnetic detection avoids mechanical wear compared with mechanical switches.
Common applications include brushless motor commutation, rotational speed measurement, gear counting, position detection, proximity switch, home appliance control and Arduino development. Add 0.1μF decoupling capacitor between VCC and GND for anti‑interference performance.
1. Unipolar Non‑Contact Hall‑Effect Magnetic Switch A3144EUA is a unipolar hall‑effect switch IC from Allegro MicroSystems. It only responds to S‑pole magnetic field, integrates hall sensing element, amplifier and Schmitt trigger circuit inside single chip. Adopts open‑collector output, external pull‑up resistor required. Realizes contact‑less magnetic trigger detection, eliminates mechanical contact wear, long service life for repetitive switching tasks。
2. Built‑in Schmitt Trigger & Anti‑interference Performance Internal Schmitt trigger provides hysteresis characteristic, effectively suppresses signal jitter and environmental noise interference, guarantees stable switching output. Fast response speed, supports high‑frequency magnetic signal acquisition, suitable for high‑speed rotation and pulse counting scenarios。
3. Wide Operating Voltage & Reverse‑voltage Protection Supply voltage range 3.8V‑24V DC, compatible with 5V,12V,24V common industrial power supply systems. Integrated reverse‑power protection circuit, avoids chip damage caused by power‑supply reverse connection. Max sink output current up to 50mA, can directly drive LED, small‑signal relay and logic‑level circuit。
4. High‑grade Wide Temperature Adaptability Operating temperature covers ‑40℃ ~ +150℃, adapts to high‑temperature industrial and partial automotive working environments. TO‑92 3‑pin through‑hole plastic package, simple pin assignment, convenient for manual soldering and PCB through‑hole assembly, compact footprint for space‑limited equipment design。
5. Universal Magnetic‑sensing Component Classic mass‑produced hall‑switch device, widely used for new‑product design, prototype development, BOM matching and legacy‑equipment repair replacement. RoHS compliant, sufficient global stock for industrial control, consumer electronics and educational projects。
Item | Specifications |
|---|---|
Part Number | A3144EUA |
Product Series | Unipolar Hall‑Effect Switch Sensor IC |
Manufacturer | Allegro MicroSystems |
Sensing Type | Unipolar, Triggered by S‑pole magnetic field |
Output Type | Open‑Collector Output, external pull‑up resistor required |
Magnetic Operating Point | Typical 60 Gauss |
Internal Circuit | Hall generator, Amplifier, Schmitt Trigger |
Package | TO‑92 3‑Lead Through‑Hole |
Pin Definition | Pin1:VCC; Pin2:GND; Pin3:Output |
Supply Voltage | 3.8V ~ 24V DC |
Max Sink Current | 50mA |
Protection Feature | Reverse‑voltage input protection |
Operating Temperature | ‑40℃ ~ +150℃ |
Mounting Style | Through Hole |
Compliance | RoHS Compliant |
Core Advantages | Non‑contact magnetic detection, built‑in hysteresis anti‑jitter, reverse‑voltage protection, wide voltage & wide temperature range, large sink‑current capability, compact TO‑92 through‑hole package |
Application Grade | Rotational Speed Detection, BLDC Motor Commutation, Non‑contact Limit Switch, Magnetic Proximity Trigger, Industrial Automation, Automotive Auxiliary Sensing, Educational Development Platforms, BOM Replacement & Equipment Refurbishment |
1. Rotational Speed & Pulse Counting Detection Cooperate with permanent magnet for motor tachometer signal collection, rotary pulse counting, odometer and flow‑meter pulse acquisition for automation equipment。
2. BLDC Motor Commutation Control Used for brushless DC motor rotor position feedback, provides phase‑change trigger signal for small‑size BLDC fan and motor drive system。
3. Non‑contact Position & Limit Switch Magnetic proximity sensing, limit position trigger for mechanical equipment, replace traditional mechanical micro‑switch to reduce wear failure risk。
4. Industrial & Automotive Auxiliary Sensing Magnetic trigger signal acquisition for automation machinery, door‑state detection, safety alarm trigger and vehicle auxiliary sensing module。
5. Prototype Development & Equipment Repair Replacement Common hall‑sensor component for Arduino / STM32 experimental projects, standard replacement IC for legacy magnetic‑detection equipment maintenance, convenient for BOM material matching。
