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Texas Instruments INA219BIDR
- Part No.:
- INA219BIDR
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA219BIDR.pdf
- Description:
- IC CURRENT MONITOR 0.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,971
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Product details
Overview
INA219BIDR from Texas Instruments is a zero-drift, bidirectional current/power monitor IC with I²C/SMBus interface, sensing shunt voltages up to ±320 mV (PGA = /8) and bus voltages from 0 to 26 V. It delivers 12-bit ADC resolution, ±0.5% current measurement error over temperature, and integrated power calculation - used in server power rails, telecom DC-DC monitoring, and battery charger current feedback loops.
For engineers reviewing the INA219BIDR datasheet, INA219BIDR pinout, INA219BIDR application, or INA219BIDR equivalent, key selection criteria include its 3–5.5 V supply range, 16 programmable I²C addresses, ±40 µV offset voltage (typ), 532 µs 12-bit conversion time, and SOT-23-8 package compatibility with space-constrained PCB layouts.
Technical Context
The INA219BIDR integrates a delta-sigma ADC with programmable gain amplifier (PGA) supporting /1, /2, /4, and /8 settings for shunt voltage full-scale ranges of ±40 mV to ±320 mV. Its dual-channel conversion architecture independently samples shunt and bus voltage with configurable averaging (1–128 samples) and resolution (9–12 bits).
It implements on-chip multiplication logic to compute real-time power (watts) using calibrated current and bus voltage registers, with no external computation required. The device supports SMBus timeout (28 ms), open-drain I²C interface (up to 400 kHz fast mode), and operates across –40°C to +125°C with 0.7–1 mA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bus Voltage Range | 0 to 26 V - enables direct monitoring of 12 V/24 V industrial and telecom power buses without level-shifting |
| Shunt Full-Scale Range | ±40 mV to ±320 mV - selectable via PGA (/1 to /8) to match common shunt resistor values (e.g., 10 mΩ to 100 mΩ) |
| Current Accuracy | ±0.5% max over temperature - ensures reliable fault detection and energy accounting in precision power management |
| ADC Resolution | 12-bit - provides 10 µV LSB for shunt voltage and 4 mV LSB for bus voltage, enabling sub-mA current resolution |
| I²C Address Options | 16 programmable addresses (via A0/A1 pins) - allows up to 16 INA219BIDR devices on same bus for multi-rail monitoring |
| Supply Voltage | 3.0 to 5.5 V - compatible with standard microcontroller I/O domains and LDO outputs |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial control, and high-density server environments |
Pinout & Package
SOT-23-8 package (1.63 mm × 2.90 mm), thermally enhanced for high-density PCB placement with exposed pad not present - suitable for compact power subsystems requiring minimal board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Positive shunt differential input | Connects to high-side of current-sense resistor; withstands common-mode up to 26 V |
| IN− | Negative shunt differential input | Connects to low-side of shunt; also serves as bus voltage reference point (VCM = VIN−) |
| GND | Analog ground reference | Return path for internal analog circuitry; must be tied to system power ground near shunt |
| VS | Power supply input | 3–5.5 V supply for internal circuitry; independent of monitored bus voltage |
| A1, A0 | I²C address configuration inputs | Digital inputs setting one of 16 unique slave addresses (0x40–0x4F); pulled high/low externally |
| SDA | Open-drain I²C data line | Bi-directional serial data; requires external pull-up to VS or host I²C domain |
| SCL | Open-drain I²C clock line | Master-generated clock; supports 400 kHz fast mode timing per TI SBOS448G |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power calculation | On-chip multiplier computes watts directly from calibrated current and bus voltage registers - eliminates host MCU math overhead |
| Programmable conversion modes | Configurable continuous or triggered sampling with independent averaging (1–128) and resolution (9–12 bit) per channel |
| Zero-drift architecture | Sub-µV/°C offset drift enables stable long-term current monitoring in thermal-varying environments |
| High-side and low-side shunt support | Common-mode range up to 26 V allows placement on either side of load - simplifies layout in hot-swap and OR-ing applications |
| Robust input protection | Withstands ±26 V differential and –0.3 V to 26 V common-mode - tolerates short-circuit transients and inductive kickback |
Applications
| Server Power Rail Monitoring | Telecom DC-DC Converter Feedback |
|---|---|
Use Scenario: Real-time current and power tracking on 12 V and 48 V backplane distribution rails in rack-mounted servers. IC Role / Device Role / Timing Role: Bidirectional current/power monitor providing digital telemetry to BMC via I²C at 100 ms update intervals. Use Value: Enables dynamic power capping, thermal derating, and predictive failure analysis using ±0.5% accurate current data. | Use Scenario: Closed-loop current sensing in isolated 48 V to 12 V DC-DC modules for telecom base stations. IC Role / Device Role / Timing Role: High-side shunt monitor feeding real-time load current into PMBus-compliant controller for adaptive voltage scaling. Use Value: Maintains regulation accuracy across –40°C to +85°C ambient with <10 µV offset drift, reducing need for recalibration. |
| Notebook Battery Charger Management | Industrial Motor Drive Current Feedback |
Use Scenario: Input current monitoring and charge power calculation in USB-C PD 3.0 compliant laptop chargers. IC Role / Device Role / Timing Role: Dual-channel ADC measuring both adapter input current and battery charge current via shared I²C bus. Use Value: Supports precise energy accounting and USB PD contract negotiation using calibrated 12-bit shunt voltage readings. | Use Scenario: Phase current sensing in 24 V BLDC motor drives for HVAC and factory automation systems. IC Role / Device Role / Timing Role: Low-side shunt monitor interfacing with ARM Cortex-M4 host MCU for field-oriented control loop updates. Use Value: Delivers 532 µs worst-case conversion latency and ±40 µV offset - enabling <100 µs current loop response times. |
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 | Higher 16-bit resolution, 0.1% current accuracy, but 3.3 V only supply and no PGA - fixed 80 mV shunt range | Better suited for ultra-precision lab equipment; lacks PGA flexibility for wide-current-range industrial use | Select INA226AIRSAT when absolute current accuracy <0.1% is required and shunt voltage is tightly constrained |
| MAX4008AASA+ | Wider 0–80 V bus range, 1% current accuracy, SPI interface only - no I²C/SMBus support | Targeted at high-voltage industrial motor drives; incompatible with existing I²C infrastructure | Choose MAX4008AASA+ for >26 V bus monitoring where SPI is acceptable and ±0.5% accuracy is sufficient |
Compared with INA226AIRSAT and MAX4008AASA+, the INA219BIDR uniquely balances I²C compatibility, PGA configurability, and –40°C to +125°C operation - making it optimal for cost-sensitive, thermally demanding, multi-rail embedded power systems requiring flexible shunt scaling.
Availability
INA219BIDR is available at Aetrix Electronics and suitable for server power rail monitoring, telecom DC-DC converter feedback, and notebook battery charger management requiring stable component supply and long-term production continuity.
Supply support for INA219BIDR 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 delivering analog and embedded processing solutions, with over 50 years of innovation in precision signal conditioning and power management ICs.
The INA219BIDR belongs to TI's high-accuracy current sense amplifier product line, designed specifically for digital power monitoring in space-constrained, thermally aggressive applications where I²C integration and calibration flexibility are critical.
FAQ
What is the maximum bus voltage the INA219BIDR can measure?
The INA219BIDR supports a bus voltage input range of 0 to 26 V. This specification is absolute - applying more than 26 V to the IN+ or IN− pins violates absolute maximum ratings and may damage the device. The internal ADC scaling supports two full-scale ranges (16 V and 32 V), but the physical input tolerance remains capped at 26 V per the datasheet's Absolute Maximum Ratings table. Always ensure external clamping or design margin below this limit.
Does the INA219BIDR require external calibration to report current in amperes?
Yes, the INA219BIDR requires programming of the Calibration Register (05h) to report current in amperes. The device measures raw shunt voltage and bus voltage, then uses the Calibration Register value - calculated from shunt resistance (RSHUNT) and desired Current_LSB - to scale the Current Register (04h) output. Without this step, the Current Register reads zero. TI provides Equation 1 in SBOS448G for precise calibration register derivation based on system-specific parameters.
Can the INA219BIDR be used with a 5 V supply while monitoring a 24 V bus?
Yes, the INA219BIDR operates from 3 V to 5.5 V on its VS pin while simultaneously measuring bus voltages up to 26 V referenced to IN−. The supply voltage (VS) powers only the internal circuitry and I²C interface; it is fully isolated from the high-side bus voltage domain. This separation allows safe 5 V logic-level interfacing with microcontrollers even when monitoring 24 V power rails - a key feature confirmed in Section 8.3.1 of the INA219BIDR datasheet.
How does the PGA setting affect shunt voltage measurement on the INA219BIDR?
The PGA setting on the INA219BIDR scales the full-scale shunt voltage range: /1 = ±40 mV, /2 = ±80 mV, /4 = ±160 mV, and /8 = ±320 mV. This directly determines the minimum detectable current for a given shunt resistor. For example, with RSHUNT = 10 mΩ, PGA = /8 enables measurement up to ±32 A, whereas PGA = /1 limits full-scale to ±4 A. The PGA is configured via bits 11–10 in the Configuration Register (00h) and affects only the shunt channel - bus voltage range remains independent.
Is the INA219BIDR pin-compatible with the INA219AIDR?
Yes, the INA219BIDR is pin-compatible and footprint-compatible with the INA219AIDR. Both share identical SOT-23-8 packaging, pinout, and register map. The primary difference lies in accuracy specifications: the INA219BIDR guarantees ±0.5% current measurement error over temperature, while the INA219AIDR specifies ±1.0%. All electrical characteristics, timing, and functional behavior are otherwise identical - enabling drop-in replacement where higher precision is required without layout changes.
INA219BIDR 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:
- ±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
INA219BIDR FAQ
1.How can I place an order for INA219BIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA219BIDR 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 INA219BIDR reliable?
The price and inventory of INA219BIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA219BIDR is usually 5 days.
3.What payment methods are accepted for INA219BIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA219BIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA219BIDR?
INA219BIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA219BIDR 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 INA219BIDR?
For technical support, including INA219BIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA219BIDR requirements.
6.How does Aetrix verify that INA219BIDR is sourced from the original manufacturer or authorized distributors?
All INA219BIDR 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 INA219BIDR meets industry standards.
7.What is the process for return or replacement of INA219BIDR?
All INA219BIDR units undergo pre-shipment inspection (PSI). If there is an issue with INA219BIDR, 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 INA219BIDR part is unused and in its original packaging.
Return procedure for INA219BIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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