Specifications
| Type | Description |
|---|---|
| Part Number | INA3221 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Component Type | Power_IC |
| Package / Case | RGV, VQFN-16, 4.00 mm × 4.00 mm |
| Bus Voltage Sense Range | 0 V to 26 V; Normal operation |
| Number of Channels | 3; High-side current and bus voltage monitoring |
| Interface | I2C- and SMBus-compatible; Digital output interface |
| Programmable Addresses | 4; A0 pin configurable to GND, SCL, SDA, or VS |
| Operating Supply Voltage | 2.7 V to 5.5 V; Recommended operating condition |
| Operating Temperature | -40 °C to 125 °C; Recommended operating condition, TA |
| Shunt Voltage Input Range | -163.84 mV to 163.8 mV; TA=25°C, VS=3.3V, VIN+=12V, VSHUNT=0mV, VBUS=12V unless otherwise noted |
| Bus Voltage Input Range | 0 V to 26 V; TA=25°C, VS=3.3V unless otherwise noted |
| Common-Mode Rejection | 110 dB min, 120 dB typ; VIN+ = 0 V to 26 V |
| Shunt Offset Voltage | ±40 µV typ, ±80 µV max; Referred-to-input |
| Shunt Offset Voltage Drift | 0.1 µV/°C typ, 0.5 µV/°C max; TA = -40°C to 125°C |
| Shunt Offset PSRR | 15 µV/V typ; VS = 2.7 V to 5.5 V |
| Bus Offset Voltage | ±8 mV typ, ±16 mV max; Referred-to-input |
| Bus Offset Voltage Drift | 80 µV/°C typ; TA = -40°C to 125°C |
| Bus Offset PSRR | 0.5 mV/V typ; vs power supply |
| IN+ Input Bias Current | 10 µA typ; At IN+ |
| IN- Input Bias Current | 10 µA || 670 kΩ typ; At IN- |
| Input Leakage Current | 0.1 µA typ, 0.5 µA max; (IN+ pin) + (IN- pin), power-down mode |
| ADC Native Resolution | 13 bits; DC accuracy |
| Shunt Voltage LSB Step Size | 40 µV; 1 LSB step size |
| Bus Voltage LSB Step Size | 8 mV; 1 LSB step size |
| Shunt Voltage Gain Error | 0.1% typ, 0.25% max; TA=25°C unless otherwise noted |
| Shunt Voltage Gain Error Drift | 10 ppm/°C typ, 50 ppm/°C max; TA = -40°C to 125°C |
| Bus Voltage Gain Error | 0.1% typ, 0.25% max; TA=25°C unless otherwise noted |
| Bus Voltage Gain Error Drift | 10 ppm/°C typ, 50 ppm/°C max; TA = -40°C to 125°C |
| Differential Nonlinearity | ±0.1 LSB typ; DNL |
| ADC Conversion Time, CT bit 000 | 140 µs typ, 154 µs max |
| ADC Conversion Time, CT bit 001 | 204 µs typ, 224 µs max |
| ADC Conversion Time, CT bit 010 | 332 µs typ, 365 µs max |
| ADC Conversion Time, CT bit 011 | 588 µs typ, 646 µs max |
| ADC Conversion Time, CT bit 100 | 1.1 ms typ, 1.21 ms max |
| ADC Conversion Time, CT bit 101 | 2.116 ms typ, 2.328 ms max |
| ADC Conversion Time, CT bit 110 | 4.156 ms typ, 4.572 ms max |
| ADC Conversion Time, CT bit 111 | 8.244 ms typ, 9.068 ms max |
| SMBus Timeout | 28 ms min, 35 ms typ; Interface reset when SCL is low for more than 28 ms |
| Digital Input Capacitance | 3 pF typ; CI |
| Digital Input Leakage Current | 0.1 µA typ, 1 µA max; 0 V ≤ VIN ≤ VS |
| High-Level Input Voltage | 0.7 × VS min, 6 V max; VIH |
| Low-Level Input Voltage | -0.5 V min, 0.3 × VS max; VIL |
| Low-Level Output Voltage, SDA/Critical/Warning/PV | 0 V min, 0.4 V max; VS > 2.7 V, IOL = 3 mA |
| Low-Level Output Voltage, TC | 0 V min, 0.4 V max; VS > 2.7 V, IOL = 1.2 mA |
| Hysteresis Voltage | 500 mV typ; Digital input/output |
| Quiescent Current | 350 µA typ, 450 µA max; Normal operation |
| Power-Down Current | 0.5 µA typ, 2 µA max; Power-down mode |
| Power-On Reset Threshold | 2 V typ; Power supply |
| Absolute Maximum Supply Voltage | 6 V max; VS absolute maximum rating |
| Absolute Maximum Differential Input Voltage | -26 V to 26 V; (VIN+) - (VIN-); input pins must remain within -0.3 V to 26 V |
| Absolute Maximum Analog Input Common-Mode Voltage | -0.3 V to 26 V; (VIN+) + (VIN-) / 2 |
| Absolute Maximum VPU Voltage | 26 V max; VPU pin |
| HBM ESD Rating | ±2500 V; Human-body model per ANSI/ESDA/JEDEC JS-001 |
| CDM ESD Rating | ±1000 V; Charged-device model per JEDEC JESD22-C101 |
| Datasheet Status | request_only |
Product Overview
The INA3221 is a Texas Instruments triple-channel current voltage monitor in the Signal_Chain category. It is intended for high-side current and bus voltage monitoring across three channels, with a normal bus voltage sense range of 0 V to 26 V and a shunt voltage input range of -163.84 mV to 163.8 mV.
Digital communication is provided through an I2C- and SMBus-compatible interface. The A0 pin supports four programmable address options by connection to GND, SCL, SDA, or VS, supporting address selection in systems with multiple monitored rails.
The device operates from a 2.7 V to 5.5 V supply over a -40 °C to 125 °C recommended ambient temperature range. It uses a 13-bit native ADC with 40 µV shunt-voltage LSB step size and 8 mV bus-voltage LSB step size. The RGV VQFN-16 package measures 4.00 mm × 4.00 mm for compact assembly.
Key Features
- Three high-side current and bus voltage monitoring channels
- 0 V to 26 V bus voltage sense range
- I2C- and SMBus-compatible digital output interface
- Four A0-configurable programmable address options
- 2.7 V to 5.5 V recommended supply range
- -40 °C to 125 °C recommended operating temperature
- 13-bit native ADC for DC accuracy
- 40 µV shunt and 8 mV bus LSB step sizes
- 350 µA typical quiescent current in normal operation
- 0.5 µA typical current in power-down mode
Typical Applications
- Three-rail current monitoring
- High-side bus voltage monitoring
- I2C power telemetry systems
- SMBus monitored power rails
- Multi-address monitor networks
- Low-current power-down designs
- Wide-temperature signal-chain systems
Procurement Notes
When requesting a quote for INA3221, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What does the INA3221 monitor across its channels?
The INA3221 monitors high-side current and bus voltage across three channels. Its bus voltage sense range is 0 V to 26 V, and its shunt voltage input range is -163.84 mV to 163.8 mV under the stated datasheet conditions.
Which digital interface does the INA3221 use?
The INA3221 provides an I2C- and SMBus-compatible digital output interface. It also supports four programmable addresses through the A0 pin, which can be configured to GND, SCL, SDA, or VS.
What supply and temperature ranges are specified for INA3221 operation?
The recommended operating supply voltage is 2.7 V to 5.5 V. The recommended operating ambient temperature range is -40 °C to 125 °C, according to the extracted datasheet operating conditions.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.