INA3221 26V, triple channel, 13-bit, i2c output current/voltage monitor w/alerts |

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26V, triple channel, 13-bit, i2c output current/voltage monitor w/alerts



The INA3221 is a three-channel, high-side current and bus voltage monitor with an I2C- and SMBUS-compatible interface. The INA3221 monitors both shunt voltage drops and bus supply voltages, in addition to having programmable conversion times and averaging modes for these signals. The INA3221 offers both critical and warning alerts to detect multiple programmable out-of-range conditions for each channel.

The INA3221 senses current on buses that can vary from 0 V to 26 V. The device is powered from a single 2.7-V to 5.5-V supply, and draws 350 µA (typ) of supply current. The INA3221 is specified over the operating temperature range of –40°C to +125°C. The I2C- and SMBUS-compatible interface features four programmable addresses.


  • Senses Bus Voltages From 0 V to 26 V
  • Reports Shunt and Bus Voltage
  • High Accuracy:
    • Offset Voltage: ±80 µV (max)
    • Gain Error: 0.25% (max)
  • Configurable Averaging Options
  • Four Programmable Addresses
  • Programmable Alert and Warning Outputs
  • Power-Supply Operation: 2.7 V to 5.5 V

INA3221 Error Analysis

0.001m ≤ 
 mOhm ≤ 100m
0.0001 ≤ 
A ≤ 100 
2.7 ≤ 
V ≤ 36
0 ≤ 
V ≤ 36
-40 ≤ 
C ≤ 125


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Part number Order Common mode voltage (Max) (V) Common mode voltage (Min) (V) Input offset (+/-) (Max) (uV) Input offset drift (+/-) (Typ) (uV/C) Gain (V/V) Gain error (%) Gain error drift (+/-) (Max) (ppm/°C) CMRR (Min) (dB) Bandwidth (kHz) Supply voltage (Max) (V) Supply voltage (Min) (V) Iq (Max) (mA) Digital interface Features Resolution (Bits) Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
INA3221 Order now 26     0     80     0.1     1     0.25     50     110     3.5     5.5     2.7     0.35     I2C
Alert Function
Low-side Capable    
13     Catalog     -40 to 125     VQFN | 16     16VQFN: 16 mm2: 4 x 4 (VQFN | 16)