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Allegro MicroSystems CT4022/32 Isolated, 500 kHz TMR Current Sensor
High-accuracy TMR current sensing with ultra-low noise and robust isolation in compact SOIC packages
The Allegro MicroSystems CT4022 and CT4032 TMR current sensors deliver high precision current measurement with industry-leading noise performance. Featuring a 500 kHz bandwidth and just 1 mΩ primary conductor resistance, these sensors minimize power loss while supporting high inrush currents. Their differential TMR architecture actively rejects common-mode stray magnetic fields to ensure reliable, accurate readings even in electrically noisy environments.
Both versions are available in compact, RoHS-compliant SOIC packages. The CT4022 comes in a standard SOIC-8 format with reinforced isolation up to 280 VRMS, while the CT4032 in SOICW-16 supports reinforced isolation up to 565 VRMS for more demanding industrial and high-power systems. With automotive-grade qualification options and low-profile footprints, these sensors are ideal for space-constrained and safety-critical designs.
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Tunneling Magnetoresistance Technology
Allegro MicroSystems' XtremeSense™ TMR technology (Tunnel Magnetoresistance) delivers the highest magnetic sensitivity, lowest power consumption, and smallest size compared to other magnetic technologies such as Hall, AMR, and GMR. This advanced technology enables current and position sensors to achieve industry-leading performance while reducing cost, supporting applications ranging from renewable energy systems and electric vehicles to connected consumer devices.
Evaluation Boards
Allegro MicroSystems provides evaluation boards to simplify testing and integration of current sensors in lab environments.
ACSEVB-LC8-LZ6 Designed for use with LC, OL, or LZ package Allegro Hall-based or TMR-based current sensors in 6-pin or 8-pin SOIC packages.
| ACSEVB-MA16-LA16 Designed for MA, LA, or SW package Allegro Hall-based or TMR-based current sensors in 16-pin SOIC-W packages. This board provides a practical method for testing sensor performance and verifying system integration.
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