INA219AIDCNR - 26V 12-bit I2C Power Monitor | Texas Instruments
MPN: INA219AIDCNR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.96 | $1.96 |
| 10 | $1.45 | $14.50 |
| 25 | $1.32 | $33.00 |
| 100 | $1.08 | $108.00 |
| 500 | $0.92 | $460.00 |
| 1,000 | $0.78 | $780.00 |
Drop-in alternatives for INA219AIDCNR — 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:
INA219BIDCNR
✅ Drop-In📋 Reference alternative (not in catalog)
INA219AIDCNT
✅ Drop-In📋 Reference alternative (not in catalog)
INA219BIDCNT
✅ Drop-In📋 Reference alternative (not in catalog)
MAX9643
✅ Drop-In📋 Reference alternative (not in catalog)
INA219AIDCNR Maximum Ratings & Electrical Characteristics
| Common-mode voltage (max) | 26 V |
| Common-mode voltage (min) | 0 V |
| Input offset (±) (max) | 50 µV |
| Input offset drift (±) (max) | 0.5 µV/°C |
| Input offset drift (±) (typ) | 0.1 µV/°C |
| Voltage gain (V/V) | 0.125, 0.25, 0.5, 1 |
| Supply voltage (min) | 3 V |
| Supply voltage (max) | 5.5 V |
| Supply current (max) | 1 mA |
| ADC resolution | 12-bit |
| Interface | I2C/SMBus |
| Number of addresses | 16 |
| Operating temperature range | -40°C to 125°C |
| Package | SOT-23-8 (DCN) |
| Mounting type | Surface Mount |
| RoHS status | Compliant |
| MSL level | 2 (260°C, 1 year) |
INA219AIDCNR Pin Configuration
| Pin 1 | VCC — Power supply, 3 V to 5.5 V |
| Pin 2 | GND — Ground |
| Pin 3 | SDA — I2C data line |
| Pin 4 | SCL — I2C clock line |
| Pin 5 | A0 — Address select pin 0 |
| Pin 6 | A1 — Address select pin 1 |
| Pin 7 | IN+ — Positive shunt input |
| Pin 8 | IN- — Negative shunt input |
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 is suitable for 6 applications: Battery Charger Monitoring, Server Power Monitoring, Power Supply Current Sensing, Solar Panel Monitoring, Automotive Load Monitoring, IoT and Smart Home Energy Monitoring.
Battery Charger Monitoring
The INA219AIDCNR is ideal for battery charger applications, such as in smartphones and laptops, where it monitors charge and discharge currents bidirectionally. Its 12-bit ADC and programmable gain allow precise measurement of current from milliamps to amps. The I2C interface enables the host controller to read current, voltage, and power data for fuel gauging and charge control. With a common-mode range of 0-26 V, it can sense across the battery pack. The low 1 mA supply current minimizes power drain. Recommended companion parts include the BQ25601RTWR battery charger and the TPS63070RNMT DC-DC converter for efficient power delivery.
Recommended
Server Power Monitoring
In server and datacenter applications, the INA219AIDCNR monitors power consumption of individual rails, enabling real-time energy management and thermal throttling. Its high-side sensing capability and 26-V common-mode range make it suitable for 12-V and 24-V rails. The I2C interface allows multiple INA219s to be connected on a single bus with 16 addresses, enabling monitoring of many rails. The programmable conversion time and averaging filter reduce noise for stable readings. The alert pin can trigger an interrupt on overcurrent conditions. Recommended companion parts include the TPS74801DRCR LDO for clean supply and the LM5117MHX/NOPB buck controller for high-efficiency conversion.
Recommended
Power Supply Current Sensing
The INA219AIDCNR is used in bench power supplies and industrial power supplies to measure output current and power. Its bidirectional sensing allows it to monitor both sourcing and sinking currents, useful for four-quadrant supplies. The 12-bit resolution provides fine granularity for accurate load regulation. The I2C interface simplifies calibration and data logging. The device's low offset drift (±0.5 µV/°C) ensures accuracy over temperature. It can be placed in the high-side path without ground disturbance. Recommended companion parts include the LM3481MMX/NOPB boost controller and the TPS54302DDCR buck converter for various output stages.
Recommended
Solar Panel Monitoring
In solar power systems, the INA219AIDCNR monitors the current and power output of solar panels, enabling maximum power point tracking (MPPT) and system health monitoring. Its wide common-mode range (0-26 V) accommodates panel voltages up to 24 V. The bidirectional capability allows measurement of both charging and discharging in battery-based systems. The I2C interface provides digital readouts for microcontrollers. The low supply current is beneficial for energy harvesting systems. The device's accuracy helps optimize energy yield. Recommended companion parts include the BQ24610RGER solar charge controller and the TPS63070RNMT for voltage regulation.
Recommended
Automotive Load Monitoring
The INA219AIDCNR is used in automotive systems to monitor current in various loads such as lighting, motors, and infotainment. Its operating temperature range of -40°C to 125°C meets automotive requirements. The high-side sensing capability is suitable for 12-V and 24-V vehicle buses. The I2C interface allows integration with vehicle ECUs. The device's small SOT-23-8 package saves PCB space. The alert pin can signal overcurrent conditions for protection. While not AEC-Q100 qualified, it is suitable for non-safety critical applications. Recommended companion parts include the TPS7A1601DGNR LDO for stable supply and the TPS26600RHFR eFuse for protection.
Recommended
IoT and Smart Home Energy Monitoring
In IoT devices and smart home energy monitors, the INA219AIDCNR measures power consumption of appliances and devices, enabling energy management and automation. Its low supply current (1 mA) is ideal for battery-powered sensors. The I2C interface connects easily to microcontrollers like ESP32 or MSP430. The 12-bit resolution provides sufficient accuracy for energy monitoring. The device can be used in smart plugs to report real-time power usage. Its small package is suitable for compact designs. Recommended companion parts include the TPS62840DLCR ultra-low IQ buck converter and the TPS7A4700RGWR low-noise LDO for analog sections.
Recommended
Recommended Products Summary
Engineering reference data for INA219AIDCNR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA219BIDCNR | INA219AIDCNT | INA219BIDCNT | MAX9643 |
|---|---|---|---|---|---|
| Package | SOT-23-8 (DCN) | SOT-23-8 (DCN) | SOT-23-8 (DCN) | SOT-23-8 (DCN) | SOT-23-8 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Maxim Integrated |
| Input Offset (max) | ±50 µV | ±10 µV | ±50 µV | ±10 µV | [DATA_NEEDED] |
| ADC Resolution | 12-bit | 12-bit | 12-bit | 12-bit | N/A (analog output) |
| Interface | I2C/SMBus | I2C/SMBus | I2C/SMBus | I2C/SMBus | Analog |
| Common-mode Voltage Range | 0-26 V | 0-26 V | 0-26 V | 0-26 V | [DATA_NEEDED] |
| Supply Voltage Range | 3-5.5 V | 3-5.5 V | 3-5.5 V | 3-5.5 V | [DATA_NEEDED] |
| Supply Current (max) | 1 mA | 1 mA | 1 mA | 1 mA | [DATA_NEEDED] |
Key Differentiators
- Integrated 12-bit ADC and I2C interface (vs MAX9643)
- Bidirectional current sensing (vs AD8418)
- Programmable gain and calibration (vs INA214AIDCKR)
Design Notes
Place a 0.1 µF decoupling capacitor as close as possible to the VCC pin (pin 1) and GND (pin 2). For accurate current sensing, use a Kelvin connection for the shunt resistor to the IN+ and IN- pins to minimize trace resistance errors. Keep the shunt resistor close to the device and use wide traces for high-current paths.
Route the I2C lines (SDA, SCL) with appropriate pull-up resistors (typically 4.7 kΩ to VCC). Avoid routing I2C lines near high-noise switching nodes. The A0 and A1 pins should be tied to VCC or GND to set the I2C address; do not leave them floating. For multiple devices, assign unique addresses.
Ensure the shunt resistor value is chosen so that the full-scale shunt voltage does not exceed the selected gain range (e.g., ±40 mV for gain=1). The INA219 has a maximum shunt voltage of ±320 mV. Also, verify that the bus voltage does not exceed 26 V. Incorrect calibration register values will result in inaccurate current and power readings.
Compliance Information
RoHS compliant per PartGenie. Not AEC-Q100 qualified. MSL Level 2 (260°C, 1 year).
