INA226AIDGSR - 36V 16-Bit I2C Power Monitor | Texas Instruments
N.º de pieza: INA226AIDGSR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.28 | $2,28 |
| 10 | $2.05 | $20,50 |
| 100 | $1.72 | $172,00 |
| 500 | $1.45 | $725,00 |
| 1.000 | $1.21 | $1.210,00 |
INA226AIDGSR Descripción general
A current shunt monitor is an analog-front-end IC that measures the voltage drop across a low-value external sense resistor and, together with the bus voltage, computes current and power. Within the power-management hierarchy, the INA226 sits between the power stage and the host controller: it senses the rail, digitizes data with an on-chip delta-sigma ADC, and reports over an I2C/SMBus digital bus, replacing a discrete current-sense amplifier plus separate ADC.
Key features include the 36 V bus-voltage rating, 16-bit measurement resolution, programmable calibration, conversion times, and averaging, plus an integrated multiplier for direct amperes/watts readout. The I2C/SMBus-compatible interface supports up to 16 programmable addresses, and the alert pin can be programmed to respond to shunt voltage, bus voltage, or power limits, enabling fast overcurrent or undercurrent interrupts.
Architecturally, the INA226 measures shunt voltage differentially across IN+ and IN- and bus voltage at the VBUS pin. The digital engine performs the multiplication, while a calibration register scales results to the actual shunt value. Programmable conversion time and averaging let designers trade speed against noise, achieving precision suited to power-rail telemetry in server, industrial, and telecom systems.
Typical applications include server and datacenter power monitoring, battery charge/discharge management in portable equipment, industrial automation power rails, telecom and networking equipment, and solar inverters. The wide common-mode range and digital I2C output simplify integration with microcontrollers and BMS controllers.
Design tip: place the shunt resistor close to the sense pins and use Kelvin-connected traces to minimize parasitic resistance; size I2C pull-ups correctly and configure the alert limit registers before enabling interrupts.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas directas para INA226AIDGSR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con INA226AIDGSR (mismo factor de forma y huella) — difiere en Function, ADC Resolution, Alert Function, Operating Temperature, Package.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
INA226AIDGSR-Q1
✅ Sustitución directa✓ En stock
$1.55 / unidad
Ver hoja de datos →INA226AQDGSRQ1
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
INA229AIDGSR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
INA230AIDGSR
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
INA220AIDGST
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
INA226AIDGSR Especificaciones
| Función | Current, Voltage and Power Monitor |
| Bus Voltage Range | 0 V to 36 V |
| ADC Resolution | 16 bit |
| Interfaz | I2C / SMBus compatible |
| Sensing Mode | High-side or Low-side, bidirectional |
| Programmable I2C Addresses | 16 |
| Alert Function | Yes (shunt, bus, power, over/under limit) |
| Tensión de alimentación | 2.7 V to 5.5 V |
| Corriente de alimentación | 0.33 mA (typical) |
| Temperatura de funcionamiento | -40C to +125C |
| Encapsulado | 10-VSSOP (DGS) |
| Tipo de montaje | Surface Mount |
| Shunt Voltage Input Range | -163.84 mV to +163.84 mV |
| Conversion Time (programmable) | 140 us to 8244 us |
| Averaging | 1 to 1024 samples |
| Estado RoHS | Compliant |
Configuración de pines de INA226AIDGSR
| Pin 1 | VS — Power supply, 2.7 V to 5.5 V |
| Pin 2 | SCL — I2C/SMBus serial clock input |
| Pin 3 | SDA — I2C/SMBus serial data input/output |
| Pin 4 | ALERT — Multifunction alert output (open-drain) |
| Pin 5 | A0 — Address select pin 0 (GND, VS, SDA, or SCL) |
| Pin 6 | A1 — Address select pin 1 (GND, VS, SDA, or SCL) |
| Pin 7 | GND — Ground reference |
| Pin 8 | IN+ — Shunt voltage positive sense input |
| Pin 9 | IN- — Shunt voltage negative sense input |
| Pin 10 | VBUS — Bus voltage sense input, up to 36 V |
Aplicaciones típicas
INA226AIDGSR es adecuado para 6 aplicacións: Server and Datacenter Power Monitoring, Battery Charge/Discharge Management, Telecom and Networking Equipment, Industrial Automation Power Rails, Solar Inverters and MPPT Charge Controllers, Automotive Battery and Power Distribution Monitoring.
Server and Datacenter Power Monitoring
The INA226AIDGSR fits datacenter rail telemetry because its 0-36 V bus range covers 5 V, 12 V, and 28 V server rails, while the 16-bit ADC with averaging up to 1024 samples resolves milliamp-level changes needed for power-budget tracking. Its I2C interface with 16 programmable addresses lets a single bus instrument many rails, and the alert pin enables fast overcurrent interrupt handling by the BMC. Used as the sensing element between a shunt on each VRM output and the host controller, the INA226 replaces discrete sense-amplifier-plus-ADC chains. Because the conversion time is programmable from 140 us to 8244 us, telemetry polling rates can be tuned per rail; slower conversions with heavy averaging yield the ultra-precise readings (per the TI 'ultra-precise' positioning) required for accurate server power accounting.
Recomendado
Battery Charge/Discharge Management
In battery-powered systems, the INA226AIDGSR's bidirectional shunt measurement reports both charging and discharging current, enabling coulomb-style capacity estimation when current is integrated over time by the host. The 36 V bus rating covers multi-cell packs up to approximately 8-10 series cells, and the 16-bit resolution captures low-current sleep-mode drains that coarser 12-bit monitors miss. Placed on the high side between the pack and the load/charger, it keeps the system ground uninterrupted. The alert pin can be configured for overcurrent or undercurrent thresholds to interrupt the MCU during fault conditions without continuous polling. Averaging programmable up to 1024 samples suppresses switching-charge noise from the charger, per TI datasheet guidance, giving stable telemetry for state-of-charge algorithms in portable, power-tool, and UPS designs.
Recomendado
Telecom and Networking Equipment
Telecom boards operate 12 V, 24 V, and -48 V-derived distribution rails that the INA226AIDGSR monitors directly thanks to its 36 V common-mode bus rating. Network line cards use multiple INA226 devices - one per rail - with the 16 programmable I2C addresses (set via A0/A1 pins tied to GND, VS, SDA, or SCL) sharing one management bus to the microcontroller. The 0.33 mA typical supply current keeps housekeeping overhead negligible, and the SMBus compatibility aligns with standard telecom management architectures. The alert output supports comparison against programmed shunt, bus, or power limits, allowing hot-plug inrush or short-circuit detection. Ultra-precise 16-bit measurements support the fine-grained power reporting required for network-equipment energy compliance and per-card budgeting in chassis systems.
Recomendado
Industrial Automation Power Rails
Factory automation PLCs, motor drives, and I/O modules run on 24 V industrial buses that sit comfortably inside the INA226AIDGSR's 36 V maximum bus voltage. The device's -40C to +125C operating range withstands cabinet temperatures near drives and power supplies. Its I2C output connects directly to the module microcontroller without signal-conditioning circuitry, and the programmable conversion/averaging settings let designers trade response time against noise in electrically harsh environments with VFD-induced interference. Alert thresholds provide localized overcurrent fault flags feeding the safety logic. Because the shunt value is external, the same INA226 footprint serves both low-current control electronics (milliohm-to-ohm shunts, small drops) and higher-current actuator rails, standardizing one monitor part across the whole automation module BOM.
Recomendado
Solar Inverters and MPPT Charge Controllers
Solar MPPT controllers require simultaneous panel-voltage and current telemetry to track the maximum power point, which is exactly the INA226AIDGSR's function: it digitizes the shunt drop and the bus voltage and computes power in watts internally via its integrated multiplier. The 36 V bus rating suits 12 V and 24 V off-grid solar arrays, while 16-bit resolution improves MPPT granularity at low irradiance where panel currents are small and power curves are flat. The host MCU reads Power and Bus Voltage registers each control cycle to adjust the buck/boost converter duty. Programmable averaging filters switching ripple from the power stage, and the alert pin can flag overcurrent or panel over-power conditions. This makes the INA226 a compact digital front end for residential solar charge controllers and micro-inverter DC-side monitoring.
Recomendado
Automotive Battery and Power Distribution Monitoring
For vehicle applications, designers select the pin-compatible INA226AIDGSR-Q1 variant, which is AEC-Q100 qualified while retaining the same 36 V, 16-bit, I2C architecture. Typical uses include monitoring the 12 V automotive rail for body controllers, tracking charge/discharge current in start-stop battery systems, and supervising loads in power-distribution boxes. Bidirectional sensing distinguishes alternator charging current from load current, supporting battery state-of-health algorithms. The -40C to +125C range and the wide bus common-mode range tolerate load-dump-adjacent conditions when paired with appropriate upstream protection. The alert pin provides a hardware interrupt for overcurrent events, and the I2C bus integrates with the vehicle's body-controller micro. Software written for the commercial INA226 runs unchanged on the -Q1 part since register maps are identical.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para INA226AIDGSR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | INA226AIDGSR-Q1 | INA229AIDGSR | INA220AIDGST | INA230AIDGSR |
|---|---|---|---|---|---|
| Package | 10-VSSOP (DGS) | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| ADC Resolution | 16 bit | 16 bit | 20 bit | 12 bit | 16 bit |
| Bus Voltage Range | 0 V to 36 V | 0 V to 36 V | 0 V to 36 V | 0 V to 26 V | 0 V to 36 V |
| Interface | I2C / SMBus | I2C / SMBus | SPI | I2C / SMBus | I2C / SMBus |
| Programmable Addresses | 16 | 16 | N/A (SPI, chip select) | 16 | 16 |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Alert Pin | Yes | Yes | Yes | No | Yes |
Diferenciadores clave
- 16-bit ultra-precise resolution vs 12-bit family members (frente a INA220AIDGST)
- Native I2C multi-drop bus compatibility (frente a INA229AIDGSR)
- Wide 36 V bus range vs 26 V in lower-cost alternatives (frente a INA220AIDGST)
Notas de diseño
Use Kelvin (4-wire) connections from the shunt resistor pads to the INA226 IN+ and IN- pins. Route the sense traces directly from the shunt body, not from shared high-current copper, so that trace and solder-joint resistance is excluded from the measurement. Keep IN+/IN- as a tightly coupled differential pair and place the INA226 within a few millimeters of the shunt. This single layout practice typically dominates total system accuracy, since PCB interconnect resistance of even 1 mOhm equals a 10 mOhm shunt's 10% error if not Kelvin-connected.
Decouple the VS pin (2.7 V to 5.5 V) with a 0.1 uF ceramic capacitor placed within 2 mm of pin 1, and tie A0/A1 firmly to their selected rails - floating address pins cause bus contention with other I2C devices. Size the shunt so the maximum expected current produces less than 163.84 mV full-scale drop (e.g., a 10 mOhm shunt suits up to 16 A). Balance shunt power dissipation (I^2 x R) against measurement resolution: smaller shunts run cooler but amplify the role of the INA226 input-referred error.
Configure the calibration register before interpreting Current and Power registers - without calibration these read raw values and mislead firmware. Write the calibration value only while conversions are masked or after reset to avoid in-flight data inconsistency. The ALERT pin is open-drain and requires a pull-up; configure the alert limit and mask registers before enabling interrupts to prevent spurious faults at power-up. Finally, verify I2C bus pull-up sizing against bus capacitance - with 16 devices sharing one bus in multi-rail systems, excessive pull-up resistance slows edges and causes address acknowledgments to fail.
Información de cumplimiento
RoHS compliant per TI product page for the INA226 family. AEC-Q100 not qualified - use INA226AIDGSR-Q1 or INA226AQDGSRQ1 for automotive. REACH, halogen-free, and conflict-minerals status not stated in provided data.
