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Texas Instruments INA236BIDDFR
- Part No.:
- INA236BIDDFR
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA236BIDDFR.pdf
- Description:
- 48-V 16-BIT ULTRAPRECISE
- Quantity:
- Payment:
- Shipping:
Inventory:5,367
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Product details
Overview
INA236BIDDFR from Texas Instruments is a 16-bit ultra-precise digital current, voltage, and power monitor IC for high-side or low-side shunt sensing in systems with bus voltages up to 48 V. It operates from 1.7 V to 5.5 V, delivers 0.1% gain error, 5 µV offset, and reports real-time current (A), bus voltage (V), and power (W) via I²C/SMBus. It is used in battery-powered wearables and smart speakers for accurate energy monitoring.
For engineers reviewing the INA236BIDDFR datasheet, INA236BIDDFR pinout, INA236BIDDFR application, or INA236BIDDFR equivalent, key selection criteria include its –0.3 V to 48 V common-mode range, programmable 20 mV/80 mV full-scale shunt range, 1.2-V–compliant I²C interface, dual device address options, and DSBGA-8 package footprint compatibility with space-constrained portable designs.
Technical Context
The INA236BIDDFR integrates a low-offset delta-sigma ADC multiplexed between shunt and bus voltage inputs, enabling simultaneous high-accuracy current and voltage measurement. Its input bias current is ≤10 nA in current-measurement mode, supporting use of higher-value sense resistors for sub-mA current detection without accuracy degradation.
It features configurable averaging (1–1024 samples), programmable conversion times (133 µs to 8.66 ms), and independent alert logic for over/under-current, over/under-voltage, and power over-limit events. The ALERT pin is open-drain and supports both fault reporting and conversion-ready notification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 16-bit delta-sigma - enables 65,536-step resolution for precise current/voltage quantization |
| Shunt Gain Error | ±0.1% max - ensures <1 mA absolute error at 1 A full-scale with 10 mΩ shunt |
| Shunt Offset Voltage | ±5 µV max - allows accurate measurement of <50 µA current with 100 mΩ shunt |
| Common-Mode Range | –0.3 V to +48 V - supports direct sensing on 12 V, 24 V, 48 V rails independent of supply voltage |
| Supply Voltage | 1.7 V to 5.5 V - compatible with 1.8 V, 3.3 V, and 5 V logic domains and battery-backed operation |
| I²C Interface | 1.2-V–compliant SMBus - interoperable with ultra-low-voltage microcontrollers and PMICs |
| Operating Temp | –40°C to +125°C - qualified for industrial and automotive cabin-adjacent environments |
Pinout & Package
The INA236BIDDFR is housed in an 8-pin SOT-23 (DDF) package measuring 1.60 mm × 2.90 mm, optimized for compact PCB layouts in portable electronics. Thermal resistance RθJA is 146.8°C/W, requiring minimal copper area for thermal management in continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Analog input | Positive shunt terminal - connects to bus side (high-side) or load side (low-side) of sense resistor |
| IN– | Analog input | Negative shunt terminal - reference point for shunt voltage and bus voltage measurement (–0.3 V to 48 V) |
| VS | Power supply | 1.7–5.5 V analog/digital supply - powers internal ADC, registers, and I²C interface |
| GND | Ground | Common analog/digital return - must be connected to system ground plane for noise immunity |
| SCL | Digital input | I²C clock line - open-drain, accepts 1.2 V–5.5 V logic levels with 100 ns setup/hold timing |
| SDA | Digital I/O | I²C bidirectional data line - open-drain, supports Fast Mode (400 kHz) and High-Speed Mode (2.94 MHz) |
| A0 | Digital input | Address select pin - sets I²C address to 0x40 or 0x41 when tied to GND or VS respectively |
| ALERT | Digital output | Open-drain fault/status pin - asserts on programmed over/under limits or conversion completion |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Full-Scale Range | 20 mV or 80 mV shunt voltage range - selects optimal ADC resolution for low- or high-current applications |
| Configurable Averaging | 1–1024 sample averaging - reduces noise in noisy environments while maintaining responsiveness |
| Low Input Bias Current | ≤10 nA in current-measurement mode - enables use of >1 Ω shunt resistors for µA-level current sensing |
| Direct Power Readout | Internal multiplier with calibration register - outputs power in watts without host-side computation |
| General Call Addressing | I²C general call support - synchronizes conversions across multiple INA236BIDDFR devices on same bus |
Applications
| Mobile Phone Power Monitoring | Smart Speaker Battery Management |
|---|---|
Use Scenario: Real-time tracking of battery discharge current, system rail voltage, and instantaneous power during voice assistant wake cycles and audio playback. IC Role / Device Role / Timing Role: Current/voltage/power monitor IC - measures shunt voltage across battery protection FET and bus voltage at PMIC input with 133 µs minimum conversion time. Use Value: Enables accurate battery fuel gauging and thermal-aware power capping using factory-calibrated 0.1% gain error and ±5 µV offset. | Use Scenario: Monitoring charging current and voltage during USB-C PD fast charging, and detecting overcurrent faults during speaker driver activation. IC Role / Device Role / Timing Role: Digital power monitor - senses high-side shunt on 5 V/9 V/15 V/20 V PD input rails with –0.3 V to 48 V common-mode tolerance. Use Value: Supports safe multi-voltage charging compliance by triggering ALERT on overvoltage/overcurrent before damage thresholds are reached. |
| Wearable Health Sensor Node | Rack Server PSU Telemetry |
Use Scenario: Measuring ultra-low standby current (<100 µA) and dynamic sensor subsystem power in fitness trackers with coin-cell batteries. IC Role / Device Role / Timing Role: Precision current monitor - uses 80 mV full-scale range and low 10 nA bias current to resolve sub-µA currents with 100 mΩ shunt. Use Value: Extends battery life estimation accuracy by minimizing measurement-induced error and enabling true µA-level sleep current validation. | Use Scenario: Per-rail telemetry in 1U server PSUs, monitoring +12 V, +5 V, and +3.3 V output currents and voltages for redundancy and thermal derating. IC Role / Device Role / Timing Role: Multi-rail power monitor - deployed in parallel with unique I²C addresses (A0-configured) to report current, voltage, and power per rail via shared bus. Use Value: Provides real-time power budgeting and fault isolation using synchronized conversions and programmable alert thresholds per rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current, voltage, and power monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA226AIDRCT | Same 16-bit architecture but 36-V max common-mode, 0.2% gain error, SOT-23-8 package | Limited to ≤36 V rails; lacks 48 V capability and 0.1% precision of INA236BIDDFR | Select when cost sensitivity outweighs need for 48 V operation or ultra-low offset |
| INA238BIDDFR | Successor with 20-bit resolution, 0.05% gain error, 1 µV offset, and extended 85-V common-mode range | Higher precision and voltage rating; requires updated layout due to different pinout and thermal pad | Select for next-gen designs needing enhanced accuracy or 48–85 V rail support |
Compared with INA226AIDRCT, the INA236BIDDFR provides 12 V higher common-mode headroom and tighter gain/offset specs for 48 V battery systems; compared with INA238BIDDFR, it offers proven production maturity and lower BOM cost where 16-bit resolution suffices.
Availability
INA236BIDDFR is available at Aetrix Electronics and suitable for mobile phones, smart speakers, and wearable electronics requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for INA236BIDDFR 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, embedded processing, and power management technologies, with decades of expertise in precision signal conditioning and energy monitoring solutions.
The INA236 product line was designed for ultra-precise, low-power, multi-parameter power telemetry in space-constrained battery-powered systems - emphasizing accuracy, wide common-mode operation, and seamless I²C integration.
FAQ
What is the maximum common-mode voltage supported by the INA236BIDDFR?
The INA236BIDDFR supports a common-mode input voltage range of –0.3 V to +48 V on the IN+ and IN– pins, independent of its 1.7 V to 5.5 V supply voltage. This allows direct monitoring of 48 V battery rails or industrial power buses without level-shifting circuitry. The specification is validated across the full –40°C to +125°C operating temperature range and is not degraded by supply voltage variation.
Does the INA236BIDDFR require external calibration for current measurement?
No, the INA236BIDDFR does not require external calibration for basic current measurement. It includes a programmable 16-bit calibration register that, when loaded with a value derived from shunt resistance and desired current units, enables direct readout of current in amperes. Factory-trimmed gain and offset ensure 0.1% gain error and ±5 µV offset without user calibration - though system-level calibration can further improve absolute accuracy.
How does the ALERT pin function in the INA236BIDDFR?
The ALERT pin in the INA236BIDDFR is an open-drain output configurable via the Mask/Enable register to signal one of five conditions: shunt over/under-limit, bus over/under-limit, or power over-limit. It can also indicate conversion readiness. The pin asserts when the selected parameter exceeds its threshold in the Alert Limit register. Polarity and latching behavior are software-configurable, and the pin remains asserted until cleared by reading the Mask/Enable register or writing the Configuration register.
Can the INA236BIDDFR operate from a 1.8-V supply?
Yes, the INA236BIDDFR operates from 1.7 V to 5.5 V, making it fully compatible with 1.8-V supply rails. Its I²C interface is 1.2-V–compliant, ensuring reliable communication with 1.8-V microcontrollers and PMICs. Quiescent current is 300 µA typical at 1.8 V, and shutdown current drops to 2.2 µA - preserving battery life in always-on portable applications.
What package type is used for the INA236BIDDFR?
INA236BIDDFR uses the 8-pin SOT-23 (DDF) package, measuring 1.60 mm × 2.90 mm with standard gull-wing leads. This package is distinct from the DSBGA-8 (YBJ) variant and is optimized for reflow assembly, thermal performance (RθJA = 146.8°C/W), and compatibility with automated optical inspection in high-volume manufacturing.
INA236BIDDFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Monitor
- Sensing Method:
- High/Low-Side
- Accuracy:
- ±0.015%
- Voltage - Input:
- 1.7V ~ 5.5V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
INA236BIDDFR FAQ
1.How can I place an order for INA236BIDDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA236BIDDFR 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 INA236BIDDFR reliable?
The price and inventory of INA236BIDDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA236BIDDFR is usually 5 days.
3.What payment methods are accepted for INA236BIDDFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA236BIDDFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA236BIDDFR?
INA236BIDDFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA236BIDDFR 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 INA236BIDDFR?
For technical support, including INA236BIDDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA236BIDDFR requirements.
6.How does Aetrix verify that INA236BIDDFR is sourced from the original manufacturer or authorized distributors?
All INA236BIDDFR 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 INA236BIDDFR meets industry standards.
7.What is the process for return or replacement of INA236BIDDFR?
All INA236BIDDFR units undergo pre-shipment inspection (PSI). If there is an issue with INA236BIDDFR, 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 INA236BIDDFR part is unused and in its original packaging.
Return procedure for INA236BIDDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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