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Texas Instruments INA231AIYFDR
- Part No.:
- INA231AIYFDR
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 12-XFBGA, DSBGA
- Datasheet:
-
INA231AIYFDR.pdf
- Description:
- IC CURRENT MONITOR 0.5% 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:206
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Product details
Overview
INA231AIYFDR from Texas Instruments is a 16-bit I²C-output current, voltage, and power monitor IC for high- or low-side shunt sensing in 0 V to 28 V bus systems. It delivers ±50 µV shunt offset, 0.5% gain error, 1.8-V I²C compliance, and operates from 2.7 V to 5.5 V supply - enabling real-time power telemetry in space-constrained mobile and server power rails.
For engineers reviewing the INA231AIYFDR datasheet, INA231AIYFDR pinout, INA231AIYFDR application, or INA231AIYFDR equivalent, this device supports programmable alert thresholds, configurable averaging (1–1024 samples), direct current (A) and power (W) readouts via internal multiplier, and operates across –40°C to +125°C with 330 µA quiescent current.
Technical Context
The INA231AIYFDR integrates dual 16-bit delta-sigma ADCs-one for shunt voltage (±81.92 mV FS, 2.5 µV LSB) and one for bus voltage (0–28 V, 1.25 mV LSB)-with on-chip calibration register and multiplier logic to compute current and power without host CPU intervention. Its I²C interface supports standard/fast/high-speed modes up to 2.5 MHz and includes SMBus timeout (28 ms) and open-drain ALERT output.
It features two start-up variants: INA231A (active conversion mode) and INA231B (low-current power-down mode). The INA231AIYFDR is the A-version in YFF (DSBGA-12) package, with B2/C2 pins internally tied to VS/GND but left floating per design. Common-mode rejection exceeds 100 dB over 0–28 V input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bus voltage range | 0 V to 28 V - supports monitoring of 12 V/24 V industrial and server rails without level-shifting. |
| Shunt voltage range | ±81.92 mV - enables precise current sensing with 100 µΩ–10 mΩ shunts at ≤±81.92 A full-scale. |
| ADC resolution | 16-bit - provides 15-bit effective resolution for <0.003% current/power quantization error. |
| Gain error (max) | 0.5% - ensures accurate current scaling across temperature without per-unit calibration. |
| Shunt offset (max) | ±50 µV - limits zero-current error to <0.5 mA with 1 mΩ shunt, critical for low-power standby detection. |
| I²C compatibility | 1.8-V logic - interoperates directly with modern SoCs and microcontrollers without pull-up voltage translation. |
| Supply voltage | 2.7 V to 5.5 V - powers from single Li-ion, USB, or 3.3 V/5 V system rails. |
| Operating temp | –40°C to +125°C - qualified for automotive under-hood and industrial edge computing environments. |
Pinout & Package
INA231AIYFDR uses a 12-pin DSBGA (YFF) package measuring 1.65 mm × 1.39 mm × 0.62 mm, optimized for ultra-thin portable designs. Pin assignment follows TI's standardized DSBGA-12 top view layout with NC pins (B2, C2) left floating per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0, A1 | I²C address inputs | Configure one of 16 unique I²C addresses by tying to GND, SCL, SDA, or VS - enables multi-device bus sharing. |
| ALERT | Open-drain interrupt output | Asserts when shunt/bus voltage or power exceeds user-programmed threshold - eliminates polling overhead. |
| GND | Analog ground reference | Primary return path for shunt measurement; must be connected to low-impedance system ground plane. |
| SCL, SDA | I²C serial interface | 1.8-V compatible, open-drain lines - require external pull-ups; support up to 2.5 MHz clock for rapid telemetry. |
| BUS | Bus voltage input | Measures 0–28 V supply rail directly - no external divider needed; 830 kΩ input impedance minimizes loading. |
| IN+, IN− | Differential shunt inputs | Accept ±81.92 mV differential signal - connect across shunt resistor to measure load current bidirectionally. |
| VS | Power supply input | 2.7–5.5 V supply for IC core - independent of BUS voltage, enabling hot-swap and reverse-polarity tolerance. |
Key Features
| Feature | Design Value |
|---|---|
| Direct current/power readouts | Internal multiplier + calibration register outputs current in amperes and power in watts - reduces host firmware complexity and latency. |
| Configurable averaging | 1–1024 sample averaging - suppresses noise in noisy power rails while maintaining <9 ms max conversion time (1024×). |
| Programmable alert function | Single Alert Limit register (07h) supports five event types (SOL/SUL/BOL/BUL/POL) - enables autonomous fault response without MCU involvement. |
| High CMR performance | ≥100 dB common-mode rejection over 0–28 V - maintains accuracy despite ground bounce or supply ripple in high-dI/dt systems. |
| Low quiescent current | 330 µA typical active current - extends battery life in always-on monitoring applications such as smartphone battery gauging. |
Applications
| Smartphone Power Rail Monitoring | Server PSU Telemetry |
|---|---|
|
Use Scenario: Real-time tracking of battery discharge current, USB-C PD input power, and PMIC rail efficiency in thin-profile handsets. IC Role / Device Role / Timing Role: Current/voltage/power monitor with I²C interface - provides synchronized 16-bit measurements every 140 µs to 8.2 ms depending on averaging setting. Use Value: Enables dynamic thermal throttling and battery health estimation using calibrated current/power data without host CPU overhead. |
Use Scenario: Continuous monitoring of 12 V/48 V server power supply output current, voltage regulation, and efficiency loss. IC Role / Device Role / Timing Role: High-accuracy bus monitor - measures shunt and bus voltage simultaneously to compute real-time power delivery with <0.5% gain error. Use Value: Supports predictive maintenance and power capping by detecting subtle current drift or voltage sag before catastrophic failure. |
| Laptop Battery Charger Management | Industrial PLC Power Supervision |
|
Use Scenario: Bidirectional current sensing during charge/discharge cycles in USB-C laptop chargers with GaN FETs. IC Role / Device Role / Timing Role: Low-offset shunt monitor - uses ±50 µV max offset to resolve <1 mA current with 10 mΩ shunt, critical for coulomb counting. Use Value: Improves state-of-charge accuracy by >2% over full cycle through precise low-current measurement at standby. |
Use Scenario: Monitoring 24 V DC control rail current in programmable logic controllers to detect short circuits or motor stall conditions. IC Role / Device Role / Timing Role: Alert-triggered fault detector - asserts ALERT pin within 140 µs of overcurrent event, enabling sub-millisecond shutdown response. Use Value: Reduces system downtime by autonomously signaling faults before thermal damage occurs to downstream I/O modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current/voltage/power monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA226AIRSAT | Bidirectional capability; 16-bit resolution; 0.1% gain error; 10 µV shunt offset; supports 36 V bus. | Required for reverse-current detection (e.g., regenerative braking, battery backup); higher precision needed. | Select INA226AIRSAT when bidirectional current sensing or tighter offset/gain specs are mandatory - not pin-compatible. |
| INA219AIDR | 16-bit resolution; 0.2% gain error; 10 µV shunt offset; integrated 2.7–5.5 V supply; no ALERT pin; 2-wire I²C only. | Used in cost-sensitive, space-limited consumer electronics where alert autonomy is unnecessary. | Choose INA219AIDR for simplified BOM and lower cost in non-critical monitoring; lacks programmable alert and high-voltage bus support. |
Compared with INA231AIYFDR, INA226AIRSAT adds bidirectional sensing and tighter specs at higher cost and different pinout, while INA219AIDR omits ALERT functionality and bus voltage range - making INA231AIYFDR optimal for unidirectional 28 V systems requiring autonomous fault signaling.
Availability
INA231AIYFDR is available at Aetrix Electronics and suitable for smartphone power management, server PSU telemetry, laptop charger control, industrial PLC supervision, and test equipment requiring stable component supply with guaranteed long-term sourcing.
Supply support for INA231AIYFDR 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 sensing and power management ICs.
The INA231AIYFDR belongs to TI's high-accuracy current-sense amplifier product line, designed specifically for real-time power telemetry in compact, thermally constrained systems like mobile devices and enterprise infrastructure.
FAQ
What is the maximum bus voltage the INA231AIYFDR can monitor?
The INA231AIYFDR supports a bus voltage input range of 0 V to 28 V, as specified in its Recommended Operating Conditions. Although the internal ADC scaling allows up to 40.96 V full-scale, applying more than 28 V to the BUS pin violates absolute maximum ratings and risks permanent damage. This 28 V limit makes INA231AIYFDR suitable for 12 V and 24 V industrial and computing rails but not for 48 V telecom or EV systems.
Does the INA231AIYFDR support bidirectional current measurement?
No, the INA231AIYFDR is unidirectional - it measures current flow in one direction only, determined by shunt resistor orientation. Its shunt input accepts ±81.92 mV differential voltage but does not interpret polarity as direction; the sign of current is derived solely from the calibration register configuration and host interpretation. For true bidirectional sensing (e.g., charge/discharge), INA226AIRSAT or INA240 are required alternatives.
How does the ALERT pin function in the INA231AIYFDR?
The ALERT pin on the INA231AIYFDR is an open-drain output that asserts when any of five programmable conditions is met: shunt voltage over/under-limit, bus voltage over/under-limit, or power over-limit. It is configured via the Alert Limit register (07h) and Mask/Enable register. The pin remains asserted until the corresponding status bit is cleared by reading the Status register or reconfiguring the alert condition - enabling hardware-triggered fault response without continuous polling.
What package type is used for the INA231AIYFDR?
The INA231AIYFDR uses the YFF package - a 12-pin DSBGA (Die Size Ball Grid Array) with nominal dimensions of 1.65 mm × 1.39 mm × 0.62 mm. This ultra-compact wafer-level chip-scale package is optimized for high-density PCB layouts in smartphones and tablets. Pins B2 and C2 are no-connect (NC) and must be left floating, as they are internally tied to VS and GND respectively.
Can the INA231AIYFDR operate from a 1.8-V supply?
No, the INA231AIYFDR requires a supply voltage (VS) between 2.7 V and 5.5 V. However, its I²C interface is 1.8-V compliant - meaning SCL and SDA pins accept 1.8-V logic levels and can interface directly with 1.8-V microcontrollers without level shifters. The core analog and digital circuitry remains powered from the 2.7–5.5 V VS rail, ensuring stable operation across wide input ranges.
INA231AIYFDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-XFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Monitor
- Sensing Method:
- High/Low-Side
- Accuracy:
- ±0.5%
- Voltage - Input:
- 0V ~ 28V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DSBGA (1.65x1.39)
INA231AIYFDR FAQ
1.How can I place an order for INA231AIYFDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA231AIYFDR 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 INA231AIYFDR reliable?
The price and inventory of INA231AIYFDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA231AIYFDR is usually 5 days.
3.What payment methods are accepted for INA231AIYFDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA231AIYFDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA231AIYFDR?
INA231AIYFDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA231AIYFDR 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 INA231AIYFDR?
For technical support, including INA231AIYFDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA231AIYFDR requirements.
6.How does Aetrix verify that INA231AIYFDR is sourced from the original manufacturer or authorized distributors?
All INA231AIYFDR 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 INA231AIYFDR meets industry standards.
7.What is the process for return or replacement of INA231AIYFDR?
All INA231AIYFDR units undergo pre-shipment inspection (PSI). If there is an issue with INA231AIYFDR, 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 INA231AIYFDR part is unused and in its original packaging.
Return procedure for INA231AIYFDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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