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Compact Integrated Sensor Allegro CT427-HSN820MR with XtremeSense TMR Technology and Fault Detection

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Compact Integrated Sensor Allegro CT427-HSN820MR with XtremeSense TMR Technology and Fault Detection

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Standby Current : 6mA

working temperature : -40℃~+125℃

Current Range : ±20A

Voltage - Supply : 3.3V

Band Width : 1MHz

Response Time (tr) : 300ns

Sensitivity : 50mV/A

Bidirectional Current Detection : Support

Description : ±20A 50mV/A SOIC-8 Current Sensors RoHS

Mfr. Part # : CT427-HSN820MR

Model Number : CT427-HSN820MR

Package : SOIC-8

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Product Overview

The CT427 is a high-bandwidth, ultra-low noise integrated contact current sensor utilizing Allegro's XtremeSense TMR technology for high-accuracy current measurements. It supports eight current ranges, with the integrated current carrying conductor (CCC) handling up to 65 A and providing a linear analog output voltage. The device boasts a total output error of less than 1.0% full-scale (FS), a 300 ns output response time, and immunity to common mode fields. Integrated overcurrent detection (OCD) circuitry alerts the microcontroller via an active low fault (FLT) pin. The CT427 is offered in an industry-standard, green, RoHS-compliant 8-lead SOIC package.

Product Attributes

  • Brand: Allegro MicroSystems
  • Technology: XtremeSense TMR
  • Certifications: UL/IEC 62368-1, UL1577, AEC-Q100 Grade 1
  • Package: 8-lead SOIC
  • Compliance: Green, RoHS compliant

Technical Specifications

Model/Specification Value Unit
Product Name CT427
Max Current Carrying Conductor (ICCC_MAX) 65 A
Total Output Error (ETOT) 1.0 % FS
Output Response Time (tRESPONSE) 300 ns
Current Consumption (ICC) 6.0 mA
Bandwidth (fBW) 1.0 MHz
Supply Voltage (VCC) 3.0 - 3.6 V
Rated Isolation Voltage (VISO) 3.5 kVRMS
Working Voltage for Basic Isolation (VWVBI) 560 VRMS
Working Voltage for Reinforced Isolation (VWBRI) 280 VRMS
Noise (eN) @ 100 kHz 9.5 - 19.0 mARMS
Common Mode Field Rejection Ratio (CMFRR) -54 dB
Package Dimensions 4.89 mm 6.00 mm 1.62 mm
Operating Temperature Range -40 to 125 C
Current Ranges Supported 0 to 20 A, 20 A, 0 to 30 A, 30 A, 0 to 50 A, 50 A, 0 to 65 A, 65 A
Part Number Example (20A Unipolar) CT427-HSN820DR
Part Number Example (20A Bipolar) CT427-HSN820MR
Part Number Example (30A Unipolar) CT427-HSN830DR
Part Number Example (30A Bipolar) CT427-HSN830MR
Part Number Example (50A Unipolar) CT427-HSN850DR
Part Number Example (50A Bipolar) CT427-HSN850MR
Part Number Example (65A Unipolar) CT427-HSN865DR
Part Number Example (65A Bipolar) CT427-HSN865MR
Applications Solar/power inverters, UPS, SMPS, and telecom power supplies, Motor control, Power utility meter, Overcurrent fault protection
Overcurrent Detection (OCD) Threshold (Unipolar) 1.1 x IRANGE(MAX) (Rising), 0.9 x IRANGE(MAX) (Falling) A
Overcurrent Detection (OCD) Threshold (Bipolar) 1.1 x IRANGE(MAX) (Rising), 0.9 x IRANGE(MAX) (Falling) A
Undervoltage Lockout (UVLO) Threshold 2.45 (Falling) / 2.50 (Rising) V
Power-On Time (tON) 100 - 200 s
Rise Time (tRISE) 200 ns
Propagation Delay (tDELAY) 250 ns
FLT Response Time (tFLT#) 250 ns

2504291722_ALLEGRO-CT427-HSN820MR_C22442737.pdf


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