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Texas Instruments INA219BID
- Part No.:
- INA219BID
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA219BID.pdf
- Description:
- IC CURRENT MONITOR 0.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,511
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Product details
Overview
INA219BID from Texas Instruments is a zero-drift, bidirectional current/power monitor IC with I²C/SMBus interface, sensing shunt voltage (±320 mV full-scale) and bus voltage (0–26 V), delivering calibrated current (A), voltage (V), and power (W) readings with 0.5% max total error over temperature. It operates from 3–5.5 V supply and supports industrial temperature range (–40°C to +125°C), used in server power rail monitoring and telecom DC-DC converter supervision.
For engineers reviewing the INA219BID datasheet, INA219BID pinout, INA219BID application, or INA219BID equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative options for current/power sensing systems, and supply-chain support details specific to the INA219BID grade in SOIC-8 package.
Technical Context
The INA219BID integrates a delta-sigma ADC with programmable gain amplifier (PGA) offering /1, /2, /4, or /8 gain for shunt voltage, and dual bus voltage ranges (16 V / 32 V). Its internal multiplier and calibration register enable direct current (A) and power (W) computation without host-side math.
It supports continuous or triggered conversion modes, independent averaging (1–1024 samples) for shunt and bus channels, and features conversion-ready flag coordination, SMBus timeout (28 ms), and power-down recovery in 40 µs - all configurable via I²C registers including Configuration (00h), Calibration (05h), Current (04h), Power (03h), and Voltage (02h).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bus Voltage Range | 0 to 26 V - supports direct measurement across high-side or low-side shunts in 12 V/24 V/48 V power rails without level-shifting. |
| Shunt Full-Scale Range | ±320 mV (PGA = /8) - enables use of low-value, low-power shunts (e.g., 1–10 mΩ) while maintaining resolution down to 10 µV LSB. |
| Current Measurement Error | ±0.5% max over –25°C to +85°C - ensures stable accuracy in server and telecom thermal environments without recalibration. |
| I²C Address Options | 16 programmable addresses (A0/A1 pins) - allows up to 16 INA219BID devices on one bus for multi-rail monitoring in dense PCB layouts. |
| Supply Voltage | 3.0 V to 5.5 V - compatible with standard logic supplies and eliminates need for dedicated bias rails. |
| Quiescent Current | 0.7–1.0 mA active; 6–15 µA power-down - enables always-on monitoring with minimal impact on system standby power budget. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive auxiliary modules and industrial power supplies. |
Pinout & Package
INA219BID is packaged in an 8-pin SOIC (D package), body size 3.91 mm × 4.90 mm, with exposed pad not present. Pin functions are electrically validated per TI SBOS448G Rev G.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Positive differential shunt input | Connects to high-side of shunt resistor; accepts common-mode voltage up to 26 V relative to GND. |
| IN− | Negative differential shunt input | Connects to low-side of shunt; also serves as bus voltage reference point (VIN− = VBUS). |
| GND | Analog ground | Reference for all analog measurements; must be tied to system power ground with low-impedance path. |
| VS | Supply voltage input | 3–5.5 V analog/digital supply; powers internal ADC, PGA, and I²C interface; no sequencing required vs. bus voltage. |
| A1, A0 | I²C address select inputs | Digital inputs setting 2-bit address code; pulled high/low to configure one of 16 unique I²C addresses (0x40–0x4F). |
| SDA | Open-drain I²C data line | Bi-directional serial data; requires external pull-up (typically 2.2–10 kΩ to VS); supports Fast Mode (400 kHz) and High-Speed Mode (2.56 MHz). |
| SCL | Open-drain I²C clock line | Input-only clock signal; timing compliant with SMBus 2.0; 28 ms timeout resets interface on bus hang. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Offset drift ≤ 0.1 µV/°C - maintains <10 µV offset stability across industrial temperature range, critical for low-current (<1 A) precision sensing. |
| Programmable PGA gain | /1, /2, /4, /8 - enables single device to support multiple shunt values (e.g., 0.5 mΩ for 50 A, 10 mΩ for 1 A) without hardware change. |
| Independent averaging control | 1–1024 samples per channel - allows optimizing noise rejection for shunt (high-frequency ripple) and bus (line-frequency variation) separately. |
| Integrated power calculation | Real-time watt computation using calibrated current × bus voltage - eliminates host MCU overhead and floating-point math in firmware. |
| High CMRR | 100–120 dB - rejects common-mode noise from switching regulators and motor drives, ensuring clean readings in noisy power systems. |
Applications
| Server PSU Monitoring | Telecom DC-DC Supervision |
|---|---|
Use Scenario: Real-time current, voltage, and power telemetry on 12 V and 48 V output rails of redundant AC/DC PSUs in rack-mounted servers. IC Role / Device Role / Timing Role: Bidirectional current monitor measuring load current direction (source/sink) and calculating instantaneous power draw for thermal derating and fault logging. Use Value: Enables dynamic power capping and predictive failure analysis using ±0.5% accurate power data at 532 µs conversion time per 12-bit reading. |
Use Scenario: Input/output monitoring of isolated DC-DC converters feeding baseband processing units in 4G/5G remote radio heads. IC Role / Device Role / Timing Role: High-accuracy bus voltage and shunt current sensor interfacing directly to FPGA or ARM-based controller via I²C for closed-loop regulation and brownout detection. Use Value: Delivers 4 mV LSB bus voltage resolution and 10 µV LSB shunt resolution - sufficient to detect <50 mA load shifts under 48 V nominal input. |
| Notebook Battery Charging | Industrial Motor Drive Protection |
Use Scenario: In-line current and voltage sensing on battery charge/discharge paths in USB-C PD-enabled laptops with dual-cell Li-ion packs. IC Role / Device Role / Timing Role: Bidirectional current monitor tracking charging current (CC/CV phase) and discharge current during system operation, reporting via SMBus to EC. Use Value: Supports ±320 mV shunt range with /8 PGA - matches typical 10–20 mΩ sense resistors, enabling <100 mA resolution at 20 A full scale. |
Use Scenario: Overcurrent and power limit detection on gate driver supply rails and auxiliary power stages in servo drive inverters. IC Role / Device Role / Timing Role: High-speed current monitor triggering hardware shutdown within 1 ms when power exceeds threshold, using conversion-ready flag and fast I²C polling. Use Value: 532 µs max 12-bit conversion time plus 40 µs power-down recovery enables sub-millisecond response to short-circuit events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current/power monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA226AIRSAT | 20-bit delta-sigma ADC, 0.1% max current error, 10× higher resolution but slower (1.1 ms conversion), no PGA, fixed 36-V bus range. | Better suited for ultra-low-current (<100 mA) battery fuel gauging where resolution > accuracy is prioritized. | Select INA226AIRSAT only if 16-bit resolution is insufficient and system can tolerate longer conversion latency. |
| MAX4008BAUD+ | 16-bit SAR ADC, 0.3% current error, 1.5 µs conversion, no integrated power calc, requires external multiplier or MCU math. | Preferred in high-speed motor control loops requiring sub-µs current updates without power computation. | Choose MAX4008BAUD+ when deterministic low-latency current sampling is mandatory and power calculation is handled externally. |
Compared with INA219BID, INA226AIRSAT trades speed for resolution and removes PGA flexibility, while MAX4008BAUD+ sacrifices integrated power math and I²C simplicity for raw speed - making INA219BID optimal for balanced accuracy, integration, and responsiveness in embedded power management.
Availability
INA219BID is available at Aetrix Electronics and suitable for server power distribution, telecom DC-DC supervision, and notebook battery management systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for INA219BID 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 current sensing and power management ICs.
The INA219 product line was designed specifically for embedded systems requiring calibrated, digital current/power telemetry over I²C - targeting server, telecom, and portable electronics where space, accuracy, and integration are critical.
FAQ
What is the maximum bus voltage the INA219BID can measure?
The INA219BID supports a bus voltage input range of 0 V to 26 V, with absolute maximum rating of 26 V differential between IN+ and IN−. This allows direct measurement on 12 V, 24 V, and 48 V power rails without external level-shifting circuitry. The device's common-mode input range extends to 26 V referenced to GND, making it suitable for high-side shunt configurations in positive-ground systems.
How does the INA219BID achieve 0.5% current measurement accuracy?
The INA219BID achieves ±0.5% maximum current measurement error over –25°C to +85°C through a combination of zero-drift amplifier architecture (offset drift ≤ 0.1 µV/°C), factory-trimmed gain and offset, and integrated 12-bit delta-sigma ADC with programmable gain amplifier. Its calibration register compensates for shunt resistor tolerance and system-level errors, enabling end-system accuracy without external trimming components.
Can the INA219BID measure bidirectional current?
Yes, the INA219BID measures bidirectional current by detecting polarity of the differential shunt voltage (VIN+ − VIN−). When the voltage at IN+ is higher than IN−, current flows in the forward direction; when IN− is higher, current flows reverse. The signed 16-bit Current Register (04h) outputs values from –32768 to +32767, enabling precise tracking of charge/discharge cycles in battery applications and regenerative braking currents in motor drives.
What I²C addresses are supported by the INA219BID?
The INA219BID supports 16 unique I²C addresses (0x40 to 0x4F) configured via the A0 and A1 pins. Each pin can be tied to GND (logic 0) or VS (logic 1), forming a 2-bit address code. This allows up to 16 INA219BID devices on a single I²C bus - essential for multi-rail power monitoring in servers, telecom shelves, and industrial PLCs without address conflicts.
Does the INA219BID require external components for basic operation?
No, the INA219BID operates with only two external components: pull-up resistors on SDA and SCL lines (typically 4.7 kΩ to VS), and the current-sense shunt resistor. No external op-amps, filters, or calibration DACs are needed. Its integrated PGA, ADC, multiplier, and I²C interface eliminate the need for supporting analog circuitry - reducing BOM count, PCB area, and design validation effort compared to discrete current-sensing solutions.
INA219BID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Current Monitor
- Sensing Method:
- High-Side
- Accuracy:
- ±0.5%
- Voltage - Input:
- 0V ~ 26V
- Current - Output:
- 10mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA219BID FAQ
1.How can I place an order for INA219BID through Aetrix?
Please submit a Request for Quotation (RFQ) for INA219BID 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 INA219BID reliable?
The price and inventory of INA219BID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA219BID is usually 5 days.
3.What payment methods are accepted for INA219BID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA219BID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA219BID?
INA219BID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA219BID 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 INA219BID?
For technical support, including INA219BID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA219BID requirements.
6.How does Aetrix verify that INA219BID is sourced from the original manufacturer or authorized distributors?
All INA219BID 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 INA219BID meets industry standards.
7.What is the process for return or replacement of INA219BID?
All INA219BID units undergo pre-shipment inspection (PSI). If there is an issue with INA219BID, 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 INA219BID part is unused and in its original packaging.
Return procedure for INA219BID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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