INA223 - 26V Programmable-Gain Current Sense & Power Monitor | TI
MPN: INA223 ✓ 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 | $1.82 | $1,820.00 |
INA223 Overview
A current sense amplifier is a specialized operational amplifier designed to measure current by amplifying the small voltage drop across a shunt resistor. The INA223 belongs to the family of current shunt monitors, which are essential in power management systems for monitoring load current, supply voltage, and power consumption. These devices are critical in applications such as battery management, power supply monitoring, and system protection, where accurate current sensing is required to optimize efficiency and prevent damage.
Key features of the INA223 include programmable gain via I²C, allowing the user to set the gain to 25, 50, 100, or 200 V/V, and programmable attenuation for the voltage channel. The device provides an analog output proportional to instantaneous power, which is the product of the shunt voltage and bus voltage. It also offers a high accuracy with a typical offset voltage of 50 µV and a gain error of 0.2%. The INA223 supports both high-side and low-side sensing, making it versatile for various topologies.
The INA223 uses a zero-drift architecture to minimize offset drift over temperature, ensuring accurate measurements across the -40°C to +105°C range. The analog multiplier is implemented with a precision circuit that maintains linearity over the full input range. The I²C interface allows for real-time configuration changes, such as adjusting gain or enabling/disabling the device, which is useful in dynamic power management scenarios.
Typical applications include server and telecom power monitoring, battery-powered devices, and industrial automation. In servers, the INA223 can monitor the power consumption of individual rails to optimize energy efficiency. In battery-powered devices, it provides accurate state-of-charge estimation by measuring current and voltage. The device's low supply current of 250 µA makes it suitable for always-on monitoring in power-sensitive applications.
When designing with the INA223, ensure that the shunt resistor is placed appropriately for high-side or low-side sensing, and that the common-mode voltage does not exceed 26 V. The I²C address is set via the A0 pin, allowing up to two devices on the same bus. Proper PCB layout with Kelvin connections to the shunt is recommended to minimize parasitic resistance and maintain accuracy.
Drop-in alternatives for INA223 — 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:
INA223AIDGSR
✅ Drop-In📋 Reference alternative (not in catalog)
INA223 Maximum Ratings & Electrical Characteristics
| Common-Mode Voltage Range | 0 V to 26 V |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Supply Current (Max) | 250 µA |
| Operating Temperature Range | -40°C to +105°C |
| Package | SON-10 (2.5x2.5 mm) |
| Gain Options (Programmable) | 25, 50, 100, 200 V/V |
| Output Type | Analog (instantaneous power) |
| Interface | I²C and SMBus compatible |
| Offset Voltage (Typ) | 50 µV |
| Gain Error (Typ) | 0.2% |
| Sensing Type | High-side and low-side |
| Number of Channels | 1 |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount |
INA223 Pin Configuration
| Pin 1 | VS — Power supply (2.7V to 5.5V) |
| Pin 2 | GND — Ground |
| Pin 3 | IN+ — Positive shunt input |
| Pin 4 | IN- — Negative shunt input |
| Pin 5 | OUT — Analog output (instantaneous power) |
| Pin 6 | A0 — I²C address select |
| Pin 7 | SCL — I²C clock |
| Pin 8 | SDA — I²C data |
| Pin 9 | VBUS — Bus voltage sense input |
| Pin 10 | NC — No connect |
Typical Applications
INA223 is suitable for 6 applications: Server Power Monitoring, Battery-Powered Devices, Industrial Automation, Telecom Power Supplies, Automotive Current Sensing, Solar Power Optimizers.
Server Power Monitoring
The INA223 monitors current, voltage, and power of server rails to optimize energy efficiency. Its 26V common-mode range covers 12V rails, and the analog power output allows fast feedback for dynamic voltage scaling. The I²C interface enables configuration of gain for different shunt values. With 250µA supply current, it adds minimal overhead to the power budget. The device's accuracy (50µV offset) ensures reliable power measurement for capacity planning and thermal management.
Recommended
Battery-Powered Devices
In battery-powered devices, the INA223 provides accurate current and power monitoring to estimate state-of-charge and detect faults. Its low 250µA supply current is ideal for always-on monitoring. The programmable gain allows optimization for different current ranges, from microamps to amps. The analog power output can be used to trigger low-battery warnings or shutdown circuits. The -40°C to +105°C range ensures operation in harsh environments.
Recommended
Industrial Automation
The INA223 is used in industrial automation to monitor motor currents and power consumption. Its 26V common-mode range handles 24V industrial supplies. The analog output can be fed directly into a PLC analog input for real-time monitoring. The I²C interface allows remote configuration and calibration. The device's accuracy and low drift ensure reliable operation in factory environments with temperature variations.
Recommended
Telecom Power Supplies
In telecom equipment, the INA223 monitors -48V rails (using high-side sensing) to ensure stable power delivery. Its 26V common-mode range is suitable for sensing across a shunt on the return path. The analog power output enables fast overcurrent protection. The I²C interface allows for gain adjustment to match different shunt values. The device's low supply current is beneficial in power-constrained telecom modules.
Recommended
Automotive Current Sensing
The INA223 can be used in automotive systems to monitor battery current, motor current, and load currents. Its 26V common-mode range covers 12V and 24V automotive systems. The device is specified over -40°C to +105°C, suitable for under-hood environments. The analog power output can be used for battery management algorithms. The I²C interface allows for configuration of gain and filtering.
Recommended
Solar Power Optimizers
In solar power systems, the INA223 monitors the current and power output of each panel to maximize energy harvest. Its 26V common-mode range covers typical panel voltages. The analog power output can be used for maximum power point tracking (MPPT) algorithms. The I²C interface allows for gain adjustment to match different panel currents. The device's low supply current is ideal for always-on monitoring in remote installations.
Recommended
Recommended Products Summary
Engineering reference data for INA223 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA223AIDGSR | INA226AIDGSR | INA219AIDCNR |
|---|---|---|---|---|
| Package | SON-10 (2.5x2.5 mm) | SON-10 (2.5x2.5 mm) - same | VSSOP-10 - different | SOT-23-8 - different |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Type | Analog (instantaneous power) | Analog (instantaneous power) | Digital (I²C) | Digital (I²C) |
| Common-Mode Voltage Range | 0 V to 26 V | 0 V to 26 V | 0 V to 36 V | 0 V to 26 V |
| Supply Current (Max) | 250 µA | 250 µA | 330 µA | 1 mA |
| Programmable Gain | 25, 50, 100, 200 V/V | 25, 50, 100, 200 V/V | 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096 | 1, 2, 4, 8, 16, 32, 64, 128 |
| Offset Voltage (Typ) | 50 µV | 50 µV | 10 µV | 50 µV |
| Operating Temperature Range | -40°C to +105°C | -40°C to +105°C | -40°C to +125°C | -40°C to +125°C |
Key Differentiators
- Analog instantaneous power output (vs INA226AIDGSR)
- Low supply current of 250 µA (vs INA219AIDCNR)
- SON-10 package with small footprint (vs INA226AIDGSR)
Design Notes
Use Kelvin connections to the shunt resistor to minimize parasitic resistance and ensure accurate current sensing. Place the shunt close to the INA223 input pins and route the sense traces as a differential pair. Avoid routing high-current traces near the sense lines to prevent noise coupling.
Bypass the VS pin with a 0.1 µF ceramic capacitor placed as close as possible to the pin. A 1 µF capacitor may be added for lower frequency noise. Ensure the supply voltage is within 2.7V to 5.5V and is clean, as noise on the supply can affect measurement accuracy.
Do not exceed the common-mode voltage range of 26V on the IN+ and IN- pins. Also, ensure the shunt resistor value is chosen so that the maximum shunt voltage does not exceed the input range of the device. The I²C address is set by the A0 pin; ensure it is tied to VS or GND to avoid address conflicts.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified.
