INA226
16-Bit I2C Current, Voltage, and Power MonitorThe INA226 is a 16-bit i2c current, voltage, and power monitor from Texas Instruments. View the full INA226 datasheet below including key specifications, pinout, electrical characteristics, absolute maximum ratings.
Official INA226 datasheet (PDF) — the source this page was extracted from.
INA226 Key Specifications
| Parameter | Value |
|---|---|
| Interface | I2C/SMBus-compatible |
| ADC Resolution | 16 bits |
| Supply Voltage | 2.7V to 5.5V |
| Package Dimensions | 3.00mm × 4.90mm |
| Programmable Addresses | 16 |
| Supply Current (Typical) | 330μA |
| Bus Voltage Sensing Range | 0V to 36V |
| Shunt Voltage Input Range | -81.9175mV to 81.92mV |
| Shunt Offset Voltage (Max) | 10μV |
| Operating Temperature Range | -40°C to 125°C |
| Bus Voltage Gain Error (Max) | 0.1% |
| Shunt Voltage Gain Error (Max) | 0.1% |
INA226 Overview
Part: Texas Instruments INA226
Type: Current Shunt and Power Monitor
Description: The INA226 is a 36V, 16-bit, ultra-precise current shunt and power monitor with an I2C/SMBus-compatible interface, featuring 0.1% maximum gain error and 10μV maximum offset.
Operating Conditions:
- Supply voltage: 2.7V to 5.5V
- Operating temperature: -40 to 125 °C
- Bus voltage sensing range: 0V to 36V
- Programmable addresses: Up to 16
Absolute Maximum Ratings:
- Max supply voltage: 6 V
- Max junction/storage temperature: 150 °C
Key Specs:
- Shunt voltage input range: -81.9175 mV to 81.92 mV
- Bus voltage input range: 0 V to 36 V
- Shunt offset voltage, RTI: ±10 μV (maximum)
- Shunt voltage gain error: 0.1% (maximum)
- Bus voltage gain error: 0.1% (maximum)
- ADC native resolution: 16 Bits (Shunt voltage)
- Quiescent current: 330 μA (typical)
- Quiescent current, power-down: 0.5 μA (typical)
Features:
- Senses bus voltages from 0V to 36V
- High-side or low-side sensing
- Reports current, voltage, and power
- High accuracy: Gain error: 0.1% (maximum), Offset: 10μV (maximum)
- Configurable averaging options
- 16 programmable addresses
- Operates from 2.7V to 5.5V power supply
- 10-pin DGS (VSSOP) package
Applications:
- Rack servers
- Wireless infrastructure
- High performance computing
- Power management
- Battery cell monitors and balancers
- Power Supplies
- Test Equipment
Package:
- VSSOP (10) (3.00mm × 4.90mm)
INA226 Features
- Senses bus voltages from 0V to 36V
- High-side or low-side sensing
- Reports current, voltage, and power
- High accuracy:
- -Gain error: 0.1% (maximum)
- -Offset: 10μV (maximum)
- Configurable averaging options
- 16 programmable addresses
- Operates from 2.7V to 5.5V power supply
- 10-pin DGS (VSSOP) package
INA226 Applications
INA226 Pin Configuration
INA226 Pinout
Package: DGS 10-Pin VSSOP
| Pin Number | Pin Name | Type | Description |
|---|---|---|---|
| 1 | A1 | Digital input | Address pin. Connect to GND, SCL, SDA, or VS. Table 6-2 shows pin settings and corresponding addresses. |
| 2 | A0 | Digital input | Address pin. Connect to GND, SCL, SDA, or VS. Table 6-2 shows pin settings and corresponding addresses. |
| 3 | Alert | Digital output | Multi-functional alert, open-drain output. |
| 4 | SDA | Digital I/O | Serial bus data line, open-drain input/output. |
| 5 | SCL | Digital input | Serial bus clock line, open-drain input. |
| 6 | VS | Analog | Power supply, 2.7 V to 5.5 V. |
| 7 | GND | Analog | Ground. |
| 8 | VBUS | Analog input | Bus voltage input. |
| 9 | IN- | Analog input | Connect to load side of shunt resistor. |
| 10 | IN+ | Analog input | Connect to supply side of shunt resistor. |
Notes
- A0 and A1 are address configuration pins; their connection determines the I²C slave address (see Table 6-2 in datasheet).
- Alert, SDA, and SCL are open-drain outputs/inputs; external pull-up resistors are typically required.
- IN+ and IN- connect across a shunt resistor to measure current; VBUS measures the bus voltage independently.
- VS supply range: 2.7 V to 5.5 V.
INA226 Electrical Characteristics
TA = 25°C, VVS = 3.3 V, VIN+ = 12 V, V SENSE = (V IN+ - V IN-) = 0 mV and VVBUS = 12 V, unless otherwise noted
| PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|
| INPUT | ||||||
| Shunt voltage input range | -81.9175 | 81.92 | mV | |||
| Bus voltage input range (1) | 0 | 36 | V | |||
| CMRR | Common-mode rejection | 0 V ≤ V IN+ ≤ 36 V | 126 | 140 | dB | |
| V OS | Shunt offset voltage, RTI (2) | ±2.5 | ±10 | μV | ||
| Shunt offset voltage, RTI (2) vs temperature | -40°C ≤ T A ≤ 125°C | 0.02 | 0.1 | μV/°C | ||
| PSRR | Shunt offset voltage, RTI (2) vs Power supply | 2.7 V ≤ VS ≤ 5.5 V | ±2.5 | μV/V | ||
| V OS | Bus offset voltage, RTI (2) | ±1.25 | ±7.5 | mV | ||
| Bus offset voltage, RTI (2) vs temperature | -40°C ≤ T A ≤ 125°C | 10 | 40 | μV/°C | ||
| PSRR | Bus offset voltage, RTI (2) vs power supply | ±0.5 | mV/V | |||
| I B | Input bias current (I IN+ , I IN- pins) VBUS input impedance | 0.1 830 | nA kΩ | |||
| Input leakage (3) | (IN+ pin) + (IN- pin), Power-down mode | 0.1 | 0.5 | μA | ||
| DC ACCURACY | DC ACCURACY ADC native resolution | Shunt voltage | 16 2.5 | Bits μV | ||
| 1 LSB step size Shunt voltage gain error | Bus voltage | 1.25 0.02% | 0.1% | mV | ||
| Shunt voltage gain error vs temperature Bus voltage gain error | -40°C ≤ T A ≤ 125°C | 10 0.02% | 50 0.1% | ppm/°C | ||
| Bus voltage gain error vs temperature Differential nonlinearity | -40°C ≤ T A ≤ 125°C CT bit = 000 CT bit = 001 | 10 ±0.1 140 204 | 50 154 224 | ppm/°C LSB | ||
| CT bit = 010 CT bit = 011 | 332 588 | 365 646 | μs | |||
| t CT | ADC conversion time | CT bit = 100 CT bit = 101 | 1.1 2.116 | 1.21 2.328 | ||
| CT bit = 110 CT bit = 111 | 4.156 8.244 | 4.572 9.068 | ms | |||
| SMBus | ||||||
| SMBus timeout (4) | 28 | 35 | ms | |||
| DIGITAL INPUT/OUTPUT | DIGITAL INPUT/OUTPUT Input capacitance | 3 | pF | |||
| Leakage input current | 0 V ≤ V SCL ≤ V VS , 0 V ≤ V SDA ≤ V VS , 0 V ≤ V Alert ≤ V VS , 0 V ≤ V A0 ≤ V VS , 0 V ≤ V A1 ≤ V VS | 0.1 | 1 | μA | ||
| V IH | High-level input voltage | 0.7×V VS | 6 | V | ||
| V IL | Low-level input voltage | -0.5 | 0.3×V VS | V | ||
| V OL | Low-level output voltage, SDA, Alert Hysteresis | I OL = 3 mA | 0 | 500 | 0.4 | V mV |
| POWER SUPPLY | POWER SUPPLY | |||||
| Operating supply range | 2.7 | 5.5 | V | |||
| I Q | Quiescent current | 330 | 420 | μA | ||
| Quiescent current, power-down (shutdown) mode | 0.5 | 2 | μA |
| T A = 25°C, V VS = 3.3 V, V IN+ = 12 V, V SENSE = (V IN+ - V IN- ) = 0 mV and V VBUS = 12 V, unless otherwise noted | T A = 25°C, V VS = 3.3 V, V IN+ = 12 V, V SENSE = (V IN+ - V IN- ) = 0 mV and V VBUS = 12 V, unless otherwise noted | T A = 25°C, V VS = 3.3 V, V IN+ = 12 V, V SENSE = (V IN+ - V IN- ) = 0 mV and V VBUS = 12 V, unless otherwise noted | T A = 25°C, V VS = 3.3 V, V IN+ = 12 V, V SENSE = (V IN+ - V IN- ) = 0 mV and V VBUS = 12 V, unless otherwise noted | T A = 25°C, V VS = 3.3 V, V IN+ = 12 V, V SENSE = (V IN+ - V IN- ) = 0 mV and V VBUS = 12 V, unless otherwise noted | T A = 25°C, V VS = 3.3 V, V IN+ = 12 V, V SENSE = (V IN+ - V IN- ) = 0 mV and V VBUS = 12 V, unless otherwise noted |
|---|---|---|---|---|---|
| PARAMETER | PARAMETER | TEST CONDITIONS | MIN | TYP | UNIT |
| V POR | Power-on reset threshold | 2 | V |
INA226 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| V VS | Supply voltage | 6 | V | |
| Analog Inputs, IN+, IN- | Differential (V IN+ - V IN- ) (2) | -40 | 40 | V |
| Analog Inputs, IN+, IN- | Common-Mode (V IN+ + V IN- ) / 2 | -0.3 | 40 | V |
| V VBUS | -0.3 | 40 | V | |
| V SDA | GND - 0.3 | 6 | V | |
| V SCL | GND - 0.3 | V VS + 0.3 | V | |
| I IN | Input current into any pin | 5 | mA | |
| I OUT | Open-drain digital output current | 10 | mA | |
| T J | Junction temperature | 150 | °C | |
| T stg | Storage temperature range | -65 | 150 | °C |
INA226 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
| MIN | NOM | MAX | UNIT | ||
|---|---|---|---|---|---|
| V CM | Common-mode input voltage | 12 | V | ||
| V VS | Operating supply voltage | 3.3 | V | ||
| T A | Operating free-air temperature | -40 | 125 | °C |
INA226 Thermal Information
| THERMAL METRIC (1) | INA226 DGS (VSSOP) 10 PINS | UNIT | |
|---|---|---|---|
| R θJA | Junction-to-ambient thermal resistance | 144.6 | °C/W |
| R θJC(top) | Junction-to-case (top) thermal resistance | 53.3 | °C/W |
| R θJB | Junction-to-board thermal resistance | 80.4 | °C/W |
| Ψ JT | Junction-to-top characterization parameter | 3.5 | °C/W |
| Y JB | Junction-to-board characterization parameter | 78.9 | °C/W |
| R θJC(bot) | Junction-to-case (bottom) thermal resistance | N/A | °C/W |
INA226 Typical Application
The INA226 is a current shunt and power monitor with an I2C ™ compatible interface. The device monitors both a shunt voltage drop and bus supply voltage. Programmable calibration value, conversion times, and averaging, combined with an internal multiplier, enable direct readouts of current in amperes and power in watts.
INA226 Package Information
| PART NUMBER | PACKAGE (1) | PACKAGE SIZE (2) |
|---|---|---|
| INA226 | VSSOP (10) | 3.00mm × 4.90mm |
- (1) For all available packages, see the orderable addendum at the end of the data sheet.
- (2) The package size (length × width) is a nominal value and includes pins, where applicable.
Supply Voltage
(2.7V to 5.5V)
High-Side or Low-Side Sensing Application
High-Side or Low-Side Sensing Application
More part numbers on this datasheet
Their pages show this same datasheet. Some are linked through their part family rather than checked part by part, so confirm the exact part in the ordering information.
Other Interface ICs
- TCA6424ARGJR – Texas Instruments, I2C and SMBus I/O Expander
- BQ25895 – Texas Instruments, I2C Controlled Single Cell 5-A Fast Charger with MaxChargeTM for High Input Voltage and Adjustable Voltage 3.1-A Boost Operation
- CH340N – WCH, USB to Serial Bridge IC
- ADM3053BRWZ – Analog Devices, Signal and Power Isolated CAN Transceiver
- ADM3053BRWZ-REEL7 – Analog Devices, Signal and Power Isolated CAN Transceiver
- BQ25895RTWR.A – Texas Instruments, I2C Controlled Single Cell 5-A Fast Charger with MaxChargeTM for High Input Voltage and Adjustable Voltage 3.1-A Boost Operation
- CH334 – WCH, 4-Port USB 2.0 Hub Controller
- CH334P – WCH, 4-Port USB 2.0 Hub Controller
All Interface ICs datasheetsAll Texas Instruments datasheets (2,442)
Data on this page is extracted from publicly available manufacturer datasheets using automated tools including AI. It may contain errors or omissions. Always verify specifications against the official manufacturer datasheet before making design or purchasing decisions. See our Terms of Service. Rights holders can submit a takedown request.
The INA226 on the blog
Ask your AI agent about the INA226
Connect SheetsData to Claude, Cursor, Codex or any MCP client and your agent reads this datasheet for you: pinout, limits, register maps and design checks, with the numbers taken from the PDF.
claude mcp add --transport http sheetsdata https://mcp.sheetsdata.com/mcp
Then ask: "Can the INA226 run from my 12 V rail? Check it against the datasheet limits."
Create a free account $2 of usage every month, no card needed.