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Texas Instruments INA219AIDR
- Part No.:
- INA219AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA219AIDR.pdf
- Description:
- IC CURRENT MONITOR 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,030
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Product details
Overview
INA219AIDR from Texas Instruments is a zero-drift, bidirectional current/power monitor IC with I²C/SMBus interface, sensing shunt voltages from 0 to ±320 mV (PGA-selectable) and bus voltages from 0 to 26 V, delivering 12-bit ADC resolution, ±0.5% current measurement error over temperature, and real-time power calculation in watts - used for precision power management in server PSUs and telecom rectifiers.
For engineers reviewing the INA219AIDR datasheet, INA219AIDR pinout, INA219AIDR application, or INA219AIDR equivalent, key selection criteria include its 3–5.5 V supply range, SOT-23-8 package footprint, programmable 16 I²C addresses, ±40 µV offset voltage (INA219A grade), and integrated PGA enabling flexible shunt scaling without external components.
Technical Context
The INA219AIDR integrates a delta-sigma ADC with independent programmable averaging for shunt and bus voltage channels, supporting up to 128-sample averaging per channel to suppress noise in high-dV/dt environments. Its internal multiplier computes power by combining calibrated current and bus voltage data registers.
It implements a configurable PGA with /1, /2, /4, or /8 gain options to match shunt resistor selection, and dual bus voltage full-scale ranges (16 V or 32 V) set via BRNG bit. The device operates in continuous, triggered, or power-down modes, with conversion ready flag (CNVR) for synchronization and 40 µs wake-up time from power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bus Voltage Range | 0 to 26 V - supports direct sensing of 12 V/24 V/48 V system rails without level-shifting |
| Shunt Voltage Full-Scale | ±40 mV to ±320 mV - selectable via PGA (/1 to /8) to optimize resolution for 1 mΩ to 100 mΩ shunts |
| ADC Resolution | 12-bit - provides 10 µV LSB for shunt voltage and 4 mV LSB for bus voltage |
| Current Measurement Error | ±0.5% max over –25°C to +85°C - enables accurate load monitoring in industrial thermal environments |
| Supply Voltage | 3 V to 5.5 V - compatible with standard logic rails and isolated DC-DC outputs |
| I²C Address Options | 16 unique addresses - allows daisy-chaining up to 16 devices on same bus without address conflict |
| Quiescent Current | 0.7–1 mA active, 6–15 µA power-down - suitable for always-on monitoring with low standby power impact |
Pinout & Package
SOT-23-8 package (1.63 mm × 2.90 mm), thermally enhanced for compact PCB layouts in space-constrained power modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Positive shunt differential input | Connects to high-side of current-sense resistor; tolerates common-mode up to 26 V |
| IN− | Negative shunt differential input | Connects to low-side of shunt; also serves as bus voltage reference point (VIN− = VBUS) |
| GND | Analog ground reference | Return path for internal analog circuitry; must be tied to system power ground near shunt |
| VS | Supply voltage input | 3–5.5 V analog/digital supply; powers internal ADC, PGA, and I²C interface |
| A1, A0 | I²C address configuration inputs | Hard-wired high/low to select one of 16 device addresses (0x40–0x4F) |
| SDA | Open-drain I²C data line | Bi-directional serial data; requires external pull-up to VS or host rail (3.3 V typical) |
| SCL | Open-drain I²C clock line | Master-generated clock; supports Fast Mode (400 kHz) and High-Speed Mode (2.56 MHz) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power calculation engine | Real-time wattage output via Power Register (0x03), eliminating need for host MCU multiplication |
| Programmable shunt voltage gain | PGA settings (/1–/8) allow single device to support multiple shunt values without hardware change |
| Independent averaging control | Configurable sample counts (1–128) per channel enable optimized noise rejection for shunt vs bus measurements |
| Zero-drift architecture | ±0.1 µV/°C offset drift ensures stable calibration across –40°C to +125°C operating range |
| High CMRR (100–120 dB) | Maintains accuracy in noisy switch-mode power supplies where common-mode transients exceed 10 V/µs |
Applications
| Server PSU Monitoring | Telecom Rectifier Control |
|---|---|
Use Scenario: Real-time current, voltage, and power telemetry in 48 V intermediate bus converters for rack-mounted servers. IC Role / Device Role / Timing Role: Bidirectional current monitor measuring both input AC-DC stage output and output DC-DC stage input, synchronized via I²C polling at 10 Hz. Use Value: Enables dynamic derating and fault logging using ±0.5% current accuracy across full load range and temperature. | Use Scenario: Load balancing and hot-swap protection in distributed telecom power systems with redundant 48 V rectifiers. IC Role / Device Role / Timing Role: High-side shunt monitor interfacing with TI TPS2490 hot-swap controller, using PGA /2 mode for 80 mV full-scale range. Use Value: Supports precise current matching between parallel rectifiers within ±1% tolerance, preventing current hogging. |
| Notebook Battery Management | Industrial PLC Power Supervision |
Use Scenario: Coulomb counting and charge/discharge profiling in 3-cell Li-ion battery packs (12.6 V nominal). IC Role / Device Role / Timing Role: Measures battery pack current and terminal voltage simultaneously; reports data to host microcontroller every 100 ms via I²C. Use Value: Delivers 10 µV shunt LSB resolution enabling sub-10 mA current detection for accurate state-of-charge estimation. | Use Scenario: Input power validation and overload detection in DIN-rail mounted programmable logic controllers with 24 V DC input. IC Role / Device Role / Timing Role: Monitors field-side 24 V supply rail for brownout, overvoltage, and short-circuit events using bus voltage and current registers. Use Value: Provides fast response (<100 ms) to faults via status register CNVR flag, enabling safe shutdown before downstream damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current/power monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA226AIDGST | Higher accuracy (±0.1% current error), 16-bit ADC, 10× faster conversion (532 µs vs 586 µs), but requires 2.7–5.5 V supply and uses same SOT-23-8 package | Targeted at high-end energy metering and precision lab equipment where resolution outweighs cost | Select INA226AIDGST when <0.2% current error and 16-bit resolution are mandatory; INA219AIDR remains optimal for cost-sensitive telecom/server OEM designs |
| MAX4008AUB+ | Fixed-gain (50 V/V) analog output, no integrated ADC or I²C; requires external ADC and microcontroller for digital readout | Suitable for analog feedback loops in DC-DC controllers where digital telemetry is not required | Choose MAX4008AUB+ only if analog output simplifies system architecture; INA219AIDR delivers complete digital solution with no external components |
Compared with INA226AIDGST and MAX4008AUB+, the INA219AIDR offers the best balance of integration, accuracy, and cost for embedded power telemetry - providing calibrated current/voltage/power over I²C in a single SOT-23-8 IC without requiring external signal conditioning or higher-resolution ADCs.
Availability
INA219AIDR is available at Aetrix Electronics and suitable for server power supplies, telecom rectifiers, and notebook battery management systems requiring stable component supply and long-term production continuity.
Supply support for INA219AIDR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and power management ICs.
The INA219 belongs to TI's high-accuracy current sense amplifier product line, designed specifically for real-time power telemetry in energy-efficient computing, communications infrastructure, and industrial automation systems.
FAQ
What is the maximum bus voltage the INA219AIDR can measure?
The INA219AIDR supports a bus voltage input range of 0 to 26 V, with absolute maximum ratings allowing common-mode voltage up to 26 V at IN− and differential voltage up to ±26 V across IN+ and IN−. This makes the INA219AIDR suitable for 12 V, 24 V, and 48 V system rails. Exceeding 26 V violates absolute maximum ratings and may cause permanent damage.
Does the INA219AIDR require external calibration components?
No, the INA219AIDR does not require external calibration components. It features an internal programmable calibration register that scales raw ADC readings into amperes and watts based on user-provided shunt resistance value and desired current LSB. Calibration is performed digitally via I²C writes to register 0x05, eliminating trim pots or laser trimming.
Can the INA219AIDR measure bidirectional current flow?
Yes, the INA219AIDR measures bidirectional current by interpreting the polarity of the shunt voltage (VIN+ − VIN−). When VIN+ < VIN−, the shunt voltage register returns a two's-complement negative value, and the current register reflects negative amperes. This enables monitoring of charging and discharging currents in battery applications without hardware reconfiguration.
What is the role of the A0 and A1 pins on the INA219AIDR?
The A0 and A1 pins on the INA219AIDR are digital address configuration inputs that set the device's 7-bit I²C slave address. Each pin can be tied to GND or VS, yielding four combinations and enabling up to 16 unique addresses (0x40–0x4F) when combined with the fixed base address. This allows multiple INA219AIDR devices to share a single I²C bus without address collision.
How does the PGA setting affect shunt voltage measurement on the INA219AIDR?
The PGA setting on the INA219AIDR scales the full-scale shunt voltage range: /1 = ±40 mV, /2 = ±80 mV, /4 = ±160 mV, and /8 = ±320 mV. Selecting a higher PGA gain extends measurable current range for a given shunt resistor, while lower gain improves resolution for low-current applications. The PGA is configured via bits 11–10 in the Configuration register (0x00).
INA219AIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Monitor
- Sensing Method:
- High-Side
- Accuracy:
- ±1%
- Voltage - Input:
- 0V ~ 26V
- Current - Output:
- 10mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA219AIDR FAQ
1.How can I place an order for INA219AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA219AIDR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for INA219AIDR reliable?
The price and inventory of INA219AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA219AIDR is usually 5 days.
3.What payment methods are accepted for INA219AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA219AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA219AIDR?
INA219AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA219AIDR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for INA219AIDR?
For technical support, including INA219AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA219AIDR requirements.
6.How does Aetrix verify that INA219AIDR is sourced from the original manufacturer or authorized distributors?
All INA219AIDR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that INA219AIDR meets industry standards.
7.What is the process for return or replacement of INA219AIDR?
All INA219AIDR units undergo pre-shipment inspection (PSI). If there is an issue with INA219AIDR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The INA219AIDR part is unused and in its original packaging.
Return procedure for INA219AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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