INA219AIDCNR-Q1 - 26V 12-bit I2C Power Monitor | Texas Instruments
MPN: INA219AIDCNR-Q1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.95 | $1.95 |
| 10 | $1.75 | $17.50 |
| 100 | $1.48 | $148.00 |
| 500 | $1.25 | $625.00 |
| 1,000 | $1.05 | $1,050.00 |
Drop-in alternatives for INA219AIDCNR-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:
INA219BIDCNR
β Drop-Inπ Reference alternative (not in catalog)
INA219AIDCNT
β Drop-Inπ Reference alternative (not in catalog)
INA219AIDCNR-Q1 Maximum Ratings & Electrical Characteristics
| Function | High-side current shunt and power monitor with I2C |
| Bus Voltage Range | 0 V to 26 V |
| Supply Voltage Range | 3 V to 5.5 V |
| ADC Resolution | 12-bit |
| Shunt Full-Scale Input | +/-320 mV |
| Input Offset (A grade, max) | 100 uV |
| Input Offset Drift (typ) | 0.1 uV/C |
| Supply Current (max) | 1 mA |
| Interface | I2C / SMBus compatible, 16 registers |
| I2C Address | 0x40 to 0x45 (A0, A1 pins) |
| Operating Temperature | -40C to +125C |
| Qualification | AEC-Q100 (automotive) |
| Package | SOT-23-8 (DCN) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
INA219AIDCNR-Q1 Pin Configuration
| Pin 1 | A1 β I2C address select pin 1 (connect to GND, VS+, SDA, or SCL) |
| Pin 2 | A0 β I2C address select pin 0 (connect to GND, VS+, SDA, or SCL) |
| Pin 3 | GND β Ground reference |
| Pin 4 | VS β Power supply, 3 V to 5.5 V |
| Pin 5 | SDA β I2C data input/output |
| Pin 6 | SCL β I2C clock input |
| Pin 7 | IN- β Shunt voltage negative input, connects to load side of shunt |
| Pin 8 | IN+ β Shunt voltage positive input, connects to supply side of shunt |
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
INA219AIDCNR-Q1 is suitable for 6 applications: Automotive Battery Current Monitoring, Server and Telecom Power Rail Telemetry, Solar Charge Controller, Embedded IoT Energy Monitoring, Motor Drive DC Bus Supervision, USB-C and Portable Charger Telemetry.
Automotive Battery Current Monitoring
The INA219AIDCNR-Q1 is AEC-Q100 qualified and monitors bi-directional charge/discharge current on 12 V automotive battery buses up to 26 V common-mode. Placed across a low-ohm shunt in the battery feed, its 12-bit ADC and programmable averaging resolve microamp-level sleep-mode loads while the 0.1 uV/C drift keeps accuracy stable across the full -40C to +125C automotive range. The I2C output feeds a body-controller MCU directly without external analog circuitry.
Recommended
Server and Telecom Power Rail Telemetry
In servers and telecom shelves, the INA219 monitors each power rail's current, voltage, and computed power over I2C, enabling power budgeting and thermal management firmware. Its 1 mA maximum supply current adds negligible overhead, and the programmable 0x40-0x45 I2C addresses allow up to four monitors per bus for multi-rail supervision. The 0-26 V range covers 3.3 V, 5 V, and 12 V distribution buses with a single device and shunt.
Recommended
Solar Charge Controller
Solar charge controllers need both panel-side and battery-side current measurement; the INA219's bi-directional shunt input captures charging and reverse currents with one device per channel. The 26 V bus limit suits 12 V lead-acid and 4S lithium systems, while the 320 mV shunt range permits efficient low-value shunts that minimize power loss. Readings over I2C let the MCU implement MPPT and state-of-charge algorithms from direct watts data.
Recommended
Embedded IoT Energy Monitoring
Battery-powered IoT nodes use the INA219AIDCNR-Q1 to report load current and consumption profile back to the gateway over its I2C bus. The 1 mA supply current can be gated with the built-in power-down register setting, and the 10 uV finest-range resolution captures deep-sleep microamp loads that elude coarse analog monitors. Compact SOT-23-8 mounting keeps the sensing circuitry within the node's PCB area budget.
Recommended
Motor Drive DC Bus Supervision
In brushed and BLDC motor drives, the INA219 supervises the DC bus current feeding the gate-driver stage, detecting overload and stall conditions digitally without a dedicated comparator. The 26 V common-mode tolerance covers 12 V and 24 V drives, and the programmable conversion time plus averaging filter rejects PWM-induced ripple, giving the MCU a stable current reading at programmable sample rates suitable for closed-loop current limiting.
Recommended
USB-C and Portable Charger Telemetry
Portable charging accessories use the INA219 to monitor input and output current, computing delivered power in watts directly via the calibration register for on-screen readouts and charge protocol decisions. The 3 V to 5.5 V supply aligns with single-cell lithium or USB 5 V rails, and the 26 V bus range allows it to also monitor upstream adapters or solar inputs in hybrid portable designs. Small footprint supports space-constrained dongles.
Recommended
Recommended Products Summary
Engineering reference data for INA219AIDCNR-Q1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA219BIDCNR | INA219AIDCNT | INA226AIDGSR-Q1 | AD8418WBRZ-RL |
|---|---|---|---|---|---|
| Package | SOT-23-8 (DCN) | SOT-23-8 (DCN) - same | SOT-23-8 (DCN) - same | MSOP-10 (DGS) - different | MSOP-8 - different |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Bus Voltage Range | 0 V to 26 V | 0 V to 26 V | 0 V to 26 V | 0 V to 36 V | Up to 70 V common-mode (analog out) |
| ADC Resolution | 12-bit | 12-bit | 12-bit | 16-bit | Analog output (no ADC) |
| Input Offset (max) | 100 uV | 50 uV | 100 uV | 10 uV | 100 uV |
| Interface | I2C/SMBus digital | I2C/SMBus digital | I2C/SMBus digital | I2C digital + alert | Analog output |
| Automotive Grade | Yes (AEC-Q100) | No | No | Yes (AEC-Q100) | Yes (automotive variant) |
| Supply Current (max) | 1 mA | 1 mA | 1 mA | 300 uA | 2.3 mA |
Key Differentiators
- AEC-Q100 qualified automotive grade (vs INA219BIDCNR)
- Integrated power computation in watts (vs AD8418WBRZ-RL)
- Lower cost and simpler footprint (vs INA226AIDGSR-Q1)
Design Notes
Route the IN+ and IN- shunt sense traces as a Kelvin pair directly to the shunt resistor terminals. Never share current-carrying copper with the sense traces, as even 1 mOhm of trace resistance introduces error with high load currents. Keep the SOT-23-8 sense pins close to the shunt and place a 0.1 uF bypass capacitor on VS within 2 mm of pin 4 per TI datasheet SBOS448 layout guidelines.
Size the shunt resistor so maximum load current produces 50 mV to 100 mV drop: large enough to use the 80 mV or 160 mV shunt range divisions (best resolution), small enough to limit dissipation and bus droop. For a 5 A load, a 15 mOhm shunt gives 75 mV full-scale and 0.375 W dissipation. Recompute the calibration register value whenever the shunt changes.
The 26 V bus limit is a hard absolute maximum - protect against load-dump transients in automotive 12 V systems with a series resistor and clamp on the shunt common-mode path. Also note that bus voltage measurement range on the INA219 is 0-26 V at the IN- node; do not exceed it even though many automotive rails nominally sit at 13.8 V.
Compliance Information
-Q1 suffix indicates AEC-Q100 qualification per TI product page. RoHS/lead-free status per TI standard green product lines.
