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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Resources
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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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| Manufacturer Part No | Order Code | Manufacturer / Description | Availability | Price For | Price | Quantity | Quiescent Current | Current Sense Direction | Bandwidth | Accuracy | Measured Current | Sensor Case / Package | Sensor Case Style | No. of Pins | Supply Voltage Min | Supply Voltage Max | Isolation Voltage | Sensor IC Mounting | Operating Temperature Min | Operating Temperature Max | Product Range | Qualification | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ACS712ELCTR-20A-T
|
1329624 |
Linear Current Sensor, Hall Effect, +/- 20A, SOIC-8 ALLEGRO MICROSYSTEMS
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7,018 in stock + Check Stock & Lead Times 7,018 in stock for next day delivery (UK stock)
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1+ kr31.10 10+ kr25.52 25+ kr25.08 50+ kr24.52 100+ kr22.96 250+ kr22.29 500+ kr21.62 1000+ kr20.84 More Pricing... |
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10mA | Unidirectional, Bidirectional | 80kHz | 1.5% | 10mA | SOIC | SOIC | 8Pins | 4.5V | 5.5V | 2.1kVrms | Surface Mount | -40°C | 85°C | - | - | |
|
ACS712ELCTR-05B-T
|
1329623 |
Linear Current Sensor, Hall Effect, +/- 5A, SOIC-8 ALLEGRO MICROSYSTEMS
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3,417 in stock + Check Stock & Lead Times 3,417 in stock for next day delivery (UK stock)
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1+ kr31.76 10+ kr25.63 25+ kr25.08 50+ kr24.52 100+ kr23.63 250+ kr22.62 500+ kr21.62 1000+ kr20.95 More Pricing... |
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10mA | Unidirectional, Bidirectional | 80kHz | 1.5% | 10mA | SOIC | SOIC | 8Pins | 4.5V | 5.5V | 2.1kVrms | Surface Mount | -40°C | 85°C | - | - | |
EMC1701-2-AIZL-TR
|
2361959 |
Current Sensor, High Side, MSOP, 10 Pins MICROCHIP
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Available to supplier Lead Time + Check lead timesLead time 57 days |
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Non-Cancellable / Non Returnable
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2500+ kr9.30 |
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2500
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950µA | - | - | - | 950µA | MSOP | MSOP | 10Pins | 3V | 24V | - | - | -40°C | 85°C | - | - | |
|
ACS711KLCTR-12AB-T
|
2057423 |
Current Sensor, Overcurrent Fault, Bidirectional, ± 5%, SOIC, 8 Pins ALLEGRO MICROSYSTEMS
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1,021 in stock + Check Stock & Lead Times 1,021 in stock for next day delivery (UK stock)
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1+ kr21.92 10+ kr17.58 50+ kr16.81 100+ kr16.25 250+ kr15.58 500+ kr14.80 1000+ kr14.25 2500+ kr14.02 More Pricing... |
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4mA | Bidirectional | 100kHz | ± 5% | 4mA | SOIC | SOIC | 8Pins | 3V | 5.5V | - | Surface Mount | -40°C | 125°C | - | - | |
CSLW6B200M
|
2396419 |
Current Sensor, CSLW Series, Open Loop-200mA to 200mA, Sink, Source Output, 4.5 Vdc to 10.5 Vdc HONEYWELL
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No Longer Stocked |
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|
null | - | - | - | - | - | - | - | - | - | - | - | - | -25°C | 100°C | CSL Series | - | ||
ACS758LCB-050B-PFF-T
|
1791392 |
Current Sensor, Current Conductor, Bidirectional, - 1.2%, PFF, 5 Pins ALLEGRO MICROSYSTEMS
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2,523 in stock + Check Stock & Lead Times 2,523 in stock for next day delivery (UK stock)
More stock available week commencing 6/8/26 |
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|
1+ kr85.99 10+ kr74.61 25+ kr69.08 50+ kr66.98 100+ kr65.21 250+ kr63.89 More Pricing... |
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10mA | Bidirectional | 120kHz | - 1.2% | 10mA | PFF | PFF | 5Pins | 3V | 5.5V | 4.8kVrms | Through Hole | -40°C | 150°C | ACS758 Family | AEC-Q100 |