Current Sensors

A current sensor is a device that detects and converts current to an easily measurable output voltage, which is proportional to the current through the measured path. There are a wide variety of sensors, and each sensor is suitable for a specific current range and environmental condition. Among these sensors, a current sensing resistor is the most commonly used. It can be considered a current-to-voltage converter, where inserting a resistor into the current path, the current is converted to voltage in a linear way. The technology used by the current sensor is important because different sensors can have different characteristics for a variety of applications.


Current sensors are based on either open or closed loop hall effect technology. A closed-loop sensor has a coil that is actively driven to produce a magnetic field that opposes the field produced by the current being sensed. The hall sensor is used as a null-detecting device, and the output signal is proportional to the current being driven into the coil, which is proportional to the current being measured.


In an open loop current sensor, the magnetic flux created by the primary current is concentrated in a magnetic circuit and measured using a hall device. The output from the hall device is the signal conditioned to provide an exact (instantaneous) representation of the primary current.


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Videos

AMR Position and Current Sensing in Motor Control Applications

Circular Vertical Hall Sensor IC Technology Overview

ACS780 & ACS781 High Current Density Fully Integrated Current Sensor Ics

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ACS712ELCTR-20A-T
ACS712ELCTR-20A-T - Linear Current Sensor, Hall Effect, +/- 20A, SOIC-8

1329624

Linear Current Sensor, Hall Effect, +/- 20A, SOIC-8

ALLEGRO MICROSYSTEMS

SENSOR, CURRENT, 20A, SOIC8; Quiescent Current:10mA; Bandwidth:80kHz; Sensor Case Style:SOIC; No. of Pins:8Pins; Supply Voltage Min:4.5V; Supply Voltage Max:5.5V; Operating Temperature Min:-40°C; Operating Temperature Max:85°C; Product Range:-; MSL:MSL 2

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ACS712ELCTR-05B-T
ACS712ELCTR-05B-T - Linear Current Sensor, Hall Effect, +/- 5A, SOIC-8

1329623

Linear Current Sensor, Hall Effect, +/- 5A, SOIC-8

ALLEGRO MICROSYSTEMS

IC, SENSOR, CURRENT, 5A, SOIC8; Quiescent Current:10mA; Bandwidth:80kHz; Sensor Case Style:SOIC; No. of Pins:8Pins; Supply Voltage Min:4.5V; Supply Voltage Max:5.5V; Operating Temperature Min:-40°C; Operating Temperature Max:85°C; Product Range:-; RoHS P

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EMC1701-2-AIZL-TR
EMC1701-2-AIZL-TR - Current Sensor, High Side, 950 µA, MSOP, 10 Pins, 3 V, 24 V

2361959

Current Sensor, High Side, 950 µA, MSOP, 10 Pins, 3 V, 24 V

MICROCHIP

CURRENT SENSOR, HIGH SIDE, MSOP-10; Quiescent Current:950µA; Bandwidth:-; Sensor Case Style:MSOP; No. of Pins:10Pins; Supply Voltage Min:3V; Supply Voltage Max:24V; Operating Temperature Min:-40°C; Operating Temperature Max:85°C; Product Range:-; RoHS Ph

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ACS711KLCTR-12AB-T
ACS711KLCTR-12AB-T - Current Sensor, Overcurrent Fault, 4 mA, 100 kHz, SOIC, 8 Pins, 3 V, 5.5 V

2057423

Current Sensor, Overcurrent Fault, 4 mA, 100 kHz, SOIC, 8 Pins, 3 V, 5.5 V

ALLEGRO MICROSYSTEMS

CURRENT SENSOR, 12.5A, 3.3V, 8SOIC; Quiescent Current:4mA; Bandwidth:100kHz; Sensor Case Style:SOIC; No. of Pins:8Pins; Supply Voltage Min:3V; Supply Voltage Max:5.5V; Operating Temperature Min:-40°C; Operating Temperature Max:125°C; Product Range:-; RoH

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    CSLW6B200M
    CSLW6B200M - Current Sensor, CSLW Series, Open Loop-200mA to 200mA, Sink, Source Output, 4.5 Vdc to 10.5 Vdc

    2396419

    Current Sensor, CSLW Series, Open Loop-200mA to 200mA, Sink, Source Output, 4.5 Vdc to 10.5 Vdc

    HONEYWELL

    CURRENT SENSOR, +/-0.2A, 4.5V-10.5V; Sensor Output:Sink / Source; Supply Voltage DC Min:4.5V; Supply Voltage DC Max:10.5VDC; Current Measuring Range DC:-200mA to 200mA; Current Measuring Range AC:-200mA to 200mA; Response Time:3µs; Accuracy %:-; Product

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    ACS758LCB-050B-PFF-T
    ACS758LCB-050B-PFF-T - Current Sensor, Current Conductor, 10 mA, 120 kHz, PFF, 5 Pins, 3 V, 5.5 V

    1791392

    Current Sensor, Current Conductor, 10 mA, 120 kHz, PFF, 5 Pins, 3 V, 5.5 V

    ALLEGRO MICROSYSTEMS

    IC, CURRENT SENSOR, 50A, 3CB; Quiescent Current:10mA; Bandwidth:120kHz; Sensor Case Style:PFF; No. of Pins:5Pins; Supply Voltage Min:3V; Supply Voltage Max:5.5V; Operating Temperature Min:-40°C; Operating Temperature Max:150°C; Product Range:ACS758 Famil

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    ACS758LCB-100B-PFF-T
    ACS758LCB-100B-PFF-T - Current Sensor, Current Conductor, 10 mA, 120 kHz, PFF, 5 Pins, 3 V, 5.5 V

    1791393

    Current Sensor, Current Conductor, 10 mA, 120 kHz, PFF, 5 Pins, 3 V, 5.5 V

    ALLEGRO MICROSYSTEMS

    IC, CURRENT SENSOR, 100A, 3CB; Quiescent Current:10mA; Bandwidth:120kHz; Sensor Case Style:PFF; No. of Pins:5Pins; Supply Voltage Min:3V; Supply Voltage Max:5.5V; Operating Temperature Min:-40°C; Operating Temperature Max:150°C; Product Range:ACS758 Fami

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    XTR116UA .
    XTR116UA . - Current Sensor, Loop Transmitter, 200 µA, 380 kHz, SOIC, 8 Pins, 7.5 V, 36 V

    1097504

    Current Sensor, Loop Transmitter, 200 µA, 380 kHz, SOIC, 8 Pins, 7.5 V, 36 V

    TEXAS INSTRUMENTS

    TRANSMITTER 420MA, SMD, SOIC8, 116; Quiescent Current:200µA; Bandwidth:380kHz; Sensor Case Style:SOIC; No. of Pins:8Pins; Supply Voltage Min:7.5V; Supply Voltage Max:36V; Operating Temperature Min:-55°C; Operating Temperature Max:125°C; Product Range:-;

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    IR25750LTRPBF
    IR25750LTRPBF - Current Sensor, SOT, 5 Pins, -5 V, 20.8 V

    2580756

    Current Sensor, SOT, 5 Pins, -5 V, 20.8 V

    INFINEON

    CURRENT SENSOR IC, SOT-23-5; Quiescent Current:-; Bandwidth:-; Sensor Case Style:SOT; No. of Pins:5Pins; Supply Voltage Min:-5V; Supply Voltage Max:20.8V; Operating Temperature Min:-40°C; Operating Temperature Max:125°C; Product Range:µHVIC Series; RoHS

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