INA3221-Q1 - 3-Ch 26V I2C Power Monitor AEC-Q100 | TI
Teilenummer: INA3221-Q1 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $3.15 | $3,15 |
| 10 | $2.85 | $28,50 |
| 100 | $2.45 | $245,00 |
| 500 | $2.1 | $1.050,00 |
| 1.000 | $1.85 | $1.850,00 |
INA3221-Q1 Übersicht
A current and voltage monitor (also called a power monitor or current-sense ADC) measures the voltage across a shunt resistor to compute load current, and simultaneously measures the rail (bus) voltage, reporting both digitally over a serial bus. Within the power-management hierarchy, it sits alongside current-sense amplifiers and battery-management ICs, and is fundamental to rail diagnostics in automotive, server, and industrial systems.
Key features include three independent sensing channels, 13-bit conversion resolution, programmable conversion times and averaging modes, and programmable alert and warning outputs for overcurrent and undervoltage detection. The device operates from a single 2.7V to 5.5V supply, draws 350uA (typ) supply current, and offers four selectable I2C addresses for multi-device buses. Accuracy is high, with a maximum offset voltage of plus/minus 80uV and a maximum gain error of 0.25%.
Technically, the INA3221-Q1 uses a zero-drift architecture that minimizes offset and offset drift over temperature, preserving accuracy across the full -40C to +125C automotive operating range. Configurable averaging trades conversion speed against noise, and the alert and critical pins allow autonomous hardware fault response without CPU intervention.
Typical applications include automotive battery and multi-rail monitoring, server and telecom power-supply telemetry, and industrial automation power diagnostics. In servers it tracks CPU, memory, and peripheral rail power for energy optimization; in vehicles it supports body-control-module and infotainment rail diagnostics.
Design tip: use Kelvin connections at the shunt resistors, configure I2C address pins to avoid bus conflicts, and ensure bus voltages never exceed the 26V absolute limit. Pricing references are as of 2026-08-30.
Drop-in-Alternativen für INA3221-Q1 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
INA3221AIRGVT
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
INA3221AIRGVR
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
INA3221-Q1 Technische Daten
| Kanäle | 3 (independent high-side) |
| Bus Voltage Range | 0 V to 26 V |
| Auflösung | 13-bit |
| Schnittstelle | I2C / SMBUS compatible |
| Versorgungsspannung | 2.7 V to 5.5 V |
| Versorgungsstrom | 350 uA (typ) |
| Offset Voltage | Max +/-80 uV |
| Gain Error | Max 0.25% |
| Conversion Time | Programmable |
| Averaging Modes | Programmable |
| Alert Outputs | Warning and Critical (programmable overcurrent/undervoltage) |
| I2C Addresses | 4 selectable (A0/A1 pins) |
| Architecture | Zero-drift |
| Betriebstemperatur | -40C to +125C (AEC-Q100 Grade 1) |
| Gehäuse | 16-VQFN (RGV), 4x4 mm |
| Montageart | Surface Mount |
| Qualification | AEC-Q100 qualified |
| RoHS-Status | Compliant |
INA3221-Q1 Pin-Konfiguration
| Pin 1 | A0 — I2C address select pin 0 |
| Pin 2 | IN- — Differential input negative (channel sense) |
| Pin 3 | IN+ — Differential input positive (channel sense) |
| Pin 4 | VBUS — Bus voltage measurement input |
| Pin 5 | TC — Timing control |
| Pin 6 | CRIT — Critical alert output |
| Pin 7 | WARNING — Warning alert output |
| Pin 8 | SCL — I2C clock |
| Pin 9 | SDA — I2C data |
| Pin 10 | VS — Power supply, 2.7V to 5.5V |
| Pin 11 | GND — Ground |
| Pin 12 | PV — Power valid indicator |
| Pin 13 | A1 — I2C address select pin 1 |
| Pin 16 | PAD — Thermal pad, connect to GND |
| Pin - | Remaining pins — [DATA_NEEDED: full per-channel pin map for pins 4-5, 14-15 per RGV pinout] |
Typische Anwendungen
INA3221-Q1 ist geeignet für 6 Anwendungs: Automotive Multi-Rail Power Monitoring, Server and Datacenter Power Telemetry, Industrial Automation Power Diagnostics, Battery-Powered Portable Systems, Solar and Telecom Power Management, IoT and Smart-Home Energy Monitoring.
Automotive Multi-Rail Power Monitoring
The INA3221-Q1 fits automotive power-tree diagnostics because it is AEC-Q100 qualified for -40C to +125C and its 0-26V bus range covers 12V and 24V vehicle rails. One 16-VQFN package monitors three independent high-side rails with 13-bit resolution and +/-80uV max offset, reducing BOM count versus three single-channel monitors. Used in body-control modules and infotainment power trees, its warning and critical pins allow hardware-level fault flagging to the MCU without continuous polling; programmable averaging (conversion times configurable) trades update rate against noise for stable current readings on switched automotive loads.
Empfohlen
Server and Datacenter Power Telemetry
In servers, the INA3221-Q1 tracks CPU, memory, and peripheral rail current on three channels simultaneously, enabling per-rail power optimization and hotspot detection. Its 13-bit resolution plus programmable averaging yields stable power figures for energy-management software over the standard I2C/SMBUS interface used in server baseboards, and four selectable I2C addresses allow multiple devices on one management bus. The 350uA supply current adds negligible overhead, while the critical-alert pin supports autonomous shutdown sequencing on overcurrent events - valuable for redundant rail architectures where fast hardware response beats software polling latency.
Empfohlen
Industrial Automation Power Diagnostics
Industrial control cabinets contain many low- and medium-voltage rails (5V, 12V, 24V) whose health determines uptime. The INA3221-Q1 monitors three such high-side rails per device, its 26V bus ceiling directly covering 24V industrial supplies. Zero-drift architecture preserves +/-80uV offset accuracy over temperature, and programmable conversion times let engineers filter inrush transients from motor and actuator loads. Warning outputs feed PLC or MCU interrupts for predictive maintenance, detecting drift or overcurrent before failure, while SMBUS compatibility eases integration into existing fieldbus gateway designs.
Empfohlen
Battery-Powered Portable Systems
Multi-battery or multi-rail portable designs use the INA3221-Q1 to track charge and discharge current of battery packs and system rails with a single IC. The 350uA typical supply current (2.7-5.5V supply) minimizes telemetry overhead, and per-channel programmable averaging lets the host trade measurement speed against noise in low-power sleep states. On Raspberry Pi and Arduino platforms, mature open-source INA3221 libraries (Adafruit, ESPHome support) accelerate firmware development, while the critical pin enables hardware battery-fault cutoff independent of the application processor for improved safety.
Empfohlen
Solar and Telecom Power Management
Telecom rectifiers and solar MPPT systems monitor input, battery, and output currents concurrently - a natural three-channel fit for the INA3221-Q1. Its 26V bus range suits 12V/24V DC systems, and the dual warning/critical alert structure supports tiered responses: warning thresholds trigger derating or logging, while critical thresholds trigger hardware disconnects. Programmable conversion times allow capturing both fast transients (irradiance steps, load dumps) and slow averaged trends for state-of-charge estimation, all reported digitally over I2C to the system controller without extra ADC circuitry.
Empfohlen
IoT and Smart-Home Energy Monitoring
Smart hubs, gateways, and energy-monitoring nodes use the INA3221-Q1 to watch multiple load rails and report consumption to the cloud. Three channels in one 4x4 mm VQFN conserve board area, and the I2C interface connects directly to mainstream MCUs. ESPHome and Arduino INA3221 libraries make integration fast for edge developers. The device's 13-bit resolution resolves small standby currents for leakage analysis, while averaging modes smooth noisy switched-mode loads, enabling accurate kWh computation; alert pins provide local overcurrent protection for connected actuators.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für INA3221-Q1 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | INA3221AIRGVT | INA3221AIRGVR |
|---|---|---|---|
| Package | 16-VQFN (RGV) 4x4 mm | 16-VQFN (RGV) 4x4 mm - same | 16-VQFN (RGV) 4x4 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Channels | 3 | 3 | 3 |
| Bus Voltage Range | 0 V to 26 V | 0 V to 26 V | 0 V to 26 V |
| Resolution | 13-bit | 13-bit | 13-bit |
| AEC-Q100 Qualification | Yes (Grade 1, -40C to +125C) | No (industrial grade) | No (industrial grade) |
| Interface | I2C / SMBUS compatible | I2C / SMBUS compatible | I2C / SMBUS compatible |
| Alert Outputs | Warning + Critical | Warning + Critical | Warning + Critical |
| Relative Cost | Automotive-grade premium | Lower (standard grade) | Lower (standard grade) |
Wichtigste Unterscheidungsmerkmale
- Three independent channels in one IC (vs. INA237)
- AEC-Q100 Grade 1 automotive qualification (vs. INA3221AIRGVT)
- Dual-tier autonomous alerting (vs. INA219)
Designhinweise
Use Kelvin (4-wire) connections at each shunt resistor: route the IN+ and IN- sense traces directly to the shunt pads, not to shared current-carrying copper. Any milliohm of trace resistance in the sense path appears as a current-reading error; with a 10 mOhm shunt, 10 mOhm of stray trace resistance doubles the measured current error. Keep sense traces short and paired, and connect the exposed pad to a solid ground plane per TI datasheet layout guidelines.
Never exceed the 26V absolute maximum on any VBUS pin. On automotive or inductive loads, place a TVS diode and series resistance on VBUS sense lines to clamp load-dump transients that can far exceed the nominal 12V/24V rail. Power VS from a clean 2.7-5.5V rail with a 0.1uF local decoupling capacitor; on noisy rails, add 1uF bulk to prevent conversion glitches during I2C transactions.
Configure A0/A1 address pins deliberately - floating pins produce undefined addresses and bus conflicts when multiple INA3221-Q1 devices share one I2C segment. Also note that programmable conversion time and averaging settings trade update rate against noise: default fast conversions may look noisy on small shunts. For currents under 100 mA, increase averaging or use a larger shunt (within the +/-80uV offset budget) to preserve resolution.
The WARNING and CRIT pins are open-drain style alert outputs; use pull-up resistors to the host logic rail (not to the 26V bus) and consider masking during power-up transitions to prevent false interrupts. Route SCL/SDA away from fast-switching power-stage nodes; if the I2C bus crosses domains in industrial systems, use an isolated I2C buffer such as ISO7742 for robustness.
Compliance-Informationen
AEC-Q100 qualified per TI product page. RoHS compliance standard for active TI catalog parts; REACH and halogen-free status not stated in provided data.
