INA3221-Q1 - Triple-Channel Current/Voltage Monitor | TI
MPN: INA3221-Q1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.85 | $1,850.00 |
Drop-in alternatives for INA3221-Q1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
INA3221AQRGVRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
INA3221
✅ Drop-In📋 Reference alternative (not in catalog)
INA237
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →INA226AIDGSR
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PAC1934
✅ Drop-In📋 Reference alternative (not in catalog)
INA3221-Q1 Maximum Ratings & Electrical Characteristics
| Number of Channels | 3 |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Bus Voltage Range | 0 V to 26 V |
| Supply Current (typ) | 350 µA |
| Resolution | 13-bit |
| Offset Voltage (max) | ±80 µV |
| Gain Error (max) | 0.25% |
| Interface | I2C and SMBUS |
| I2C Addresses | 4 programmable |
| Operating Temperature Range | -40°C to +125°C |
| Package | 16-VQFN (4x4) |
| Mounting Type | Surface Mount |
| AEC-Q100 Qualified | Yes |
| Alert Outputs | Programmable |
| Averaging Modes | Configurable |
INA3221-Q1 Pin Configuration
| Pin 1 | IN1+ — Positive shunt input for channel 1 |
| Pin 2 | IN1- — Negative shunt input for channel 1 |
| Pin 3 | IN2+ — Positive shunt input for channel 2 |
| Pin 4 | IN2- — Negative shunt input for channel 2 |
| Pin 5 | IN3+ — Positive shunt input for channel 3 |
| Pin 6 | IN3- — Negative shunt input for channel 3 |
| Pin 7 | GND — Ground |
| Pin 8 | A0 — Address pin 0 |
| Pin 9 | A1 — Address pin 1 |
| Pin 10 | ALERT — Alert output |
| Pin 11 | SDA — I2C data line |
| Pin 12 | SCL — I2C clock line |
| Pin 13 | VS — Power supply |
| Pin 14 | NC — No connect |
| Pin 15 | NC — No connect |
| Pin 16 | NC — No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
INA3221-Q1 is suitable for 6 applications: Automotive Battery Monitoring, Server Power Supply Monitoring, Industrial Automation, Telecom Power Monitoring, Portable Electronics, Test and Measurement.
Automotive Battery Monitoring
The INA3221-Q1 monitors three battery-related power rails in automotive systems, such as the main battery, auxiliary battery, and ECU supply. Its 26V bus voltage range covers 12V and 24V systems, and the AEC-Q100 qualification ensures reliability in harsh environments. The device provides accurate current and voltage data for battery health monitoring and load diagnostics, with programmable alerts for overcurrent conditions.
Recommended
Server Power Supply Monitoring
In server and data center applications, the INA3221-Q1 monitors power consumption of CPU, memory, and peripheral rails. Its three channels allow simultaneous monitoring of multiple rails, and the 13-bit resolution provides fine granularity for energy efficiency optimization. The I2C interface enables easy integration with management controllers, and the programmable alerts can trigger thermal or power capping actions.
Recommended
Industrial Automation
The INA3221-Q1 is used in industrial automation to monitor power rails of PLCs, motor drives, and sensors. Its wide bus voltage range (0-26V) accommodates various industrial supply levels, and the high accuracy (±80µV offset) ensures precise power measurement. The device's robust operating temperature range (-40°C to +125°C) makes it suitable for factory floor environments.
Recommended
Telecom Power Monitoring
In telecom base stations and networking equipment, the INA3221-Q1 monitors power rails for -48V systems and digital logic. Its three channels can monitor multiple supply voltages, and the programmable averaging modes help filter noise from switching regulators. The device's low supply current (350µA) is beneficial for power-sensitive telecom applications.
Recommended
Portable Electronics
The INA3221-Q1 can be used in portable devices to monitor battery discharge and charging currents. Its low supply current and small package (16-VQFN) are ideal for space-constrained designs. The device's 2.7V minimum supply voltage allows operation from a single Li-ion cell, and the I2C interface simplifies communication with application processors.
Recommended
Test and Measurement
The INA3221-Q1 is used in test equipment to monitor power consumption of multiple channels simultaneously. Its high accuracy and 13-bit resolution enable precise measurements for validation and characterization. The programmable alerts can be used to trigger data acquisition or safety shutdowns.
Recommended
Recommended Products Summary
Engineering reference data for INA3221-Q1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA3221AQRGVRQ1 | INA3221 | INA237 | INA226 | PAC1934 |
|---|---|---|---|---|---|---|
| Package | 16-VQFN (4x4) | 16-VQFN (4x4) | 16-VQFN (4x4) | 16-VQFN (4x4) | 16-VQFN (4x4) | 16-VQFN (4x4) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Microchip Technology |
| Number of Channels | 3 | 3 | 3 | 1 | 1 | 4 |
| Resolution | 13-bit | 13-bit | 13-bit | 16-bit | 16-bit | 16-bit |
| Bus Voltage Range | 0V to 26V | 0V to 26V | 0V to 26V | 0V to 85V | 0V to 36V | 0V to 32V |
| Supply Voltage Range | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V |
| AEC-Q100 Qualified | Yes | Yes | No | No | No | No |
| Alert Outputs | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Three-channel monitoring in a single package (vs INA237)
- Automotive qualification (AEC-Q100) (vs INA3221)
- Wide bus voltage range up to 26V (vs PAC1934)
Design Notes
For accurate current sensing, use Kelvin connections to the shunt resistor to minimize parasitic resistance. Place the shunt close to the INA3221-Q1 input pins and route the sense traces as a differential pair. Keep the traces short and wide to reduce inductance and resistance.
Decouple the VS pin with a 0.1µF ceramic capacitor placed as close as possible to the pin. A 10µF bulk capacitor may be needed if the supply is noisy. Ensure the supply voltage is within 2.7V to 5.5V and stable.
Avoid exceeding the bus voltage range of 26V. Also, ensure the I2C address pins are set correctly to avoid conflicts. The ALERT pin is open-drain and requires a pull-up resistor. Do not leave unused inputs floating; tie them to GND or VS as appropriate.
Compliance Information
AEC-Q100 qualified per TI product page. RoHS compliant.
