INA3221-Q1 - 3-Ch 26V I2C Power Monitor AEC-Q100 | TI
MPN: INA3221-Q1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.15 | $3.15 |
| 10 | $2.83 | $28.30 |
| 100 | $2.4 | $240.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.85 | $1,850.00 |
Drop-in alternatives for INA3221-Q1 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
INA3221AIRGVR
β Drop-Inπ Reference alternative (not in catalog)
INA3221AQRGVR
β Drop-Inπ Reference alternative (not in catalog)
INA3221AIRGVT
β Drop-Inπ Reference alternative (not in catalog)
INA3221-Q1 Maximum Ratings & Electrical Characteristics
| Channels | 3 (independent) |
| Bus Voltage Range | 0 V to 26 V |
| Resolution | 13-bit |
| Interface | I2C / SMBUS-compatible |
| Supply Voltage | 2.7 V to 5.5 V |
| Supply Current | 350 uA (typ) |
| Offset Voltage (max) | +/- 80 uV |
| Gain Error (max) | 0.25% |
| I2C Addresses | 4 selectable (A0/A1 pins) |
| Conversion Time | Programmable |
| Averaging Modes | Programmable |
| Alert Outputs | Warning and Critical (programmable overcurrent/undervoltage) |
| Operating Temperature | -40C to +125C |
| Qualification | AEC-Q100 |
| Package | VQFN-16 (4x4 mm) |
| Mounting Type | Surface Mount |
INA3221-Q1 Pin Configuration
| Pin 1 | A0 β I2C address select pin |
| Pin 2 | SCL β I2C/SMBUS clock |
| Pin 3 | SDA β I2C/SMBUS data |
| Pin 4 | A1 β I2C address select pin |
| Pin 5 | TC β Timing control |
| Pin 6 | CRITICAL β Critical alert output |
| Pin 7 | ALERT β Warning alert output |
| Pin 9 | VBUS1 β Channel 1 bus voltage input |
| Pin 11 | IN1- β Channel 1 shunt negative |
| Pin 12 | IN1+ β Channel 1 shunt positive |
| Pin 13 | VBUS2 β Channel 2 bus voltage input |
| Pin 14 | GND β Ground |
| Pin 15 | VS β Power supply, 2.7V to 5.5V |
| Pin 16 | VBUS3 β Channel 3 bus voltage input |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. 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 Multi-Rail Monitoring, Server Power-Supply Telemetry, Telecom Power Diagnostics, Industrial Automation Power Diagnostics, Battery-Powered Portable Devices, Solar and Energy-Harvesting Systems.
Automotive Multi-Rail Monitoring
The INA3221-Q1 is AEC-Q100 qualified for -40C to +125C and senses bus voltages up to 26V, covering 12V automotive rails with headroom. Its three independent channels let one IC monitor battery, ignition-switched, and post-regulator rails simultaneously over a single I2C bus. The programmable critical-alert pin provides autonomous overcurrent flagging without MCU polling, valuable in body-control modules where fast fault response protects wiring harnesses and loads.
Recommended
Server Power-Supply Telemetry
Data-center servers require continuous tracking of CPU, memory, and peripheral rail power for energy optimization. The INA3221-Q1 monitors three rails with one 350uA device, reporting 13-bit shunt and bus readings over I2C at programmable conversion rates. Averaging modes reduce noise for stable power readings, while the warning alert flags gradual overcurrent trends, enabling predictive load management and thermal-aware workload scheduling.
Recommended
Telecom Power Diagnostics
Telecom equipment running from -48V-derived or 12V/24V intermediate buses benefits from the INA3221-Q1's 26V bus input rating and three-channel architecture. Each channel watches a card or module supply, and programmable conversion times let designers trade update rate for resolution. SMBUS compatibility ensures integration with standard telecom management buses, and alert outputs allow local fault latching for maintenance diagnostics.
Recommended
Industrial Automation Power Diagnostics
In factory automation, PLC I/O cards and motor-drive auxiliaries use multiple low-voltage rails whose health determines uptime. The INA3221-Q1 tracks three such rails with +/-80uV maximum offset accuracy, detecting small shunt signals indicative of early-stage faults. The zero-drift architecture maintains this accuracy across the full industrial temperature range, and alert outputs can trigger PLC-safe shutdown sequences without software latency.
Recommended
Battery-Powered Portable Devices
The INA3221-Q1's 350uA typical supply current and 2.7V-5.5V supply range suit battery-powered systems monitoring charge, system, and peripheral rails simultaneously. Its three channels cover battery input, charger output, and system load in one IC, simplifying coulomb-estimation firmware. Averaging modes let designers reduce noise while keeping average current consumption low, extending battery life in IoT gateways and test instruments.
Recommended
Solar and Energy-Harvesting Systems
Solar chargers and energy-harvesting nodes need to measure panel, battery, and load currents concurrently. The INA3221-Q1's three high-side channels measure panel current, battery charge current, and load current with 13-bit resolution over a 0V-26V bus range that covers common 12V panels. Programmable alerts flag overcurrent or undervoltage conditions, protecting the battery and enabling maximum-power-point tracking firmware decisions.
Recommended
Recommended Products Summary
Engineering reference data for INA3221-Q1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA3221AIRGVR | INA3221AQRGVR | INA3221AIRGVT |
|---|---|---|---|---|
| Package | VQFN-16 (4x4) | VQFN-16 (4x4) - same | VQFN-16 (4x4) - same | VQFN-16 (4x4) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Channels | 3 | 3 | 3 | 3 |
| AEC-Q100 | Qualified | Not qualified | Not qualified | Not qualified |
| Bus Voltage Range | 0 V to 26 V | 0 V to 26 V | 0 V to 26 V | 0 V to 26 V |
| Resolution | 13-bit | 13-bit | 13-bit | 13-bit |
| Offset Voltage (max) | +/- 80 uV | +/- 80 uV | +/- 80 uV | +/- 80 uV |
| Operating Temperature | -40C to +125C | -40C to +125C | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Automotive AEC-Q100 qualification (vs INA3221AIRGVR)
- Three channels in one IC (vs INA219BIDR)
- 26V bus input rating (vs INA219BIDR)
Design Notes
Use Kelvin connections at the shunt resistors: route the IN+ and IN- traces directly to the shunt pads, not to shared current-carrying copper. PCB trace resistance in series with the sense lines adds directly to the measurement error; even 10 milliohms can dominate when using low-value shunts such as 10 milliohms. Follow the TI datasheet layout guideline of symmetric, short sense traces.
Never exceed the 26V bus voltage limit on VBUS1/2/3; automotive load-dump transients can exceed this and damage the inputs. Add series resistance and TVS protection on lines exposed to transients. Also configure the A0/A1 address pins deliberately - floating address pins cause intermittent bus conflicts in multi-device I2C systems.
The device operates from 2.7V to 5.5V and draws only 350uA typical, so a simple ferrite-bead-and-capacitor filter from the 3.3V rail suffices. Use programmable averaging to reduce conversion noise on long, high-impedance shunt connections; averaging 128 samples substantially lowers effective noise at the cost of update rate.
Keep I2C bus rise times within SMBUS specification; on long backplane runs add bus buffers. The CRITICAL pin can directly gate hot-swap or load-switch enables for autonomous hardware fault response - route it as a short, low-capacitance trace to the switch enable for fastest response.
Compliance Information
AEC-Q100 qualified per TI product page. RoHS/lead-free status per TI standard green packaging; verify on TI.com quality pages.
