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Texas Instruments INA745BIRELR
- Part No.:
- INA745BIRELR
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 14-VQFN
- Datasheet:
-
INA745BIRELR.pdf
- Description:
- 40-V 16-BIT OUTPUT DIGITAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,476
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Product details
Overview
INA745BIRELR from Texas Instruments is a 16-bit digital power monitor IC with integrated 800 µΩ shunt, ±35 A continuous current sensing, ±40 V common-mode input range, I²C interface (up to 2.94 MHz), and on-chip temperature sensor (±1.5°C at 25°C). It performs real-time calculation of current, bus voltage, power, energy, and charge in telecom power delivery and industrial battery monitoring systems.
For engineers reviewing the INA745BIRELR datasheet, INA745BIRELR pinout, INA745BIRELR application, or INA745BIRELR equivalent, this page delivers verified technical context, precise pin-level design meaning, confirmed accuracy specs per grade, and validated alternative options for high-accuracy bidirectional current sensing in 40 V rail systems.
Technical Context
The INA745BIRELR integrates a precision delta-sigma ADC with independent programmable conversion times (50 µs to 4.12 ms) and sample averaging (1×–1024×) across shunt voltage, bus voltage, and die temperature inputs. Its internal 800 µΩ Kelvin-connected shunt enables low-loss, high-side/low-side current sensing without external resistors.
It employs on-die temperature compensation to correct shunt resistance drift, achieving ±30 µA/°C offset drift and ±75 ppm/°C gain drift. The ±0.5% internal oscillator supports time-based energy/charge accumulation with no external timing components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7 V to 5.5 V - powers internal circuitry while supporting 40 V bus measurements independent of VS. |
| Common-Mode Range | –0.1 V to +40 V - enables direct high-side or low-side current sensing on industrial and telecom rails. |
| Shunt Resistance | 800 µΩ (SH+ to SH–) - fixed Kelvin-sense element enabling ±35 A continuous operation with <1 mW dissipation at 20 A. |
| Current Accuracy (B Grade) | ±62.5 mA offset, ±1.25% system gain error - specifies worst-case error at full scale for production calibration planning. |
| I²C Interface Speed | Up to 2.94 MHz (high-speed mode) - supports rapid polling of power metrics in dynamic load applications. |
| ADC Resolution | 16-bit - delivers 1.2 mA LSB current step and 3.125 mV LSB bus voltage step for fine-grained telemetry. |
| Temperature Sensor | ±1.5°C accuracy at 25°C - used internally for real-time shunt TC compensation and externally for system thermal monitoring. |
Pinout & Package
INA745BIRELR is housed in a 14-pin QFN (REL) package measuring 5.00 mm × 3.00 mm with exposed thermal pad. Pinout is validated per TI SBOSAC3B Rev. AUGUST 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SH+, SH– | Analog output (Kelvin sense) | Direct access to internal 800 µΩ shunt terminals - must be routed with matched low-inductance traces for accurate DC/AC current measurement. |
| IS+, IS– | Analog input (high-current path) | Main current-carrying pins - handle ±35 A continuous; package resistance (800–1300 µΩ) defines total power loss and thermal rise. |
| IN+, IN– | Analog input (monitor interface) | Connect to SH+/SH– to read shunt voltage; enable internal calibration and temperature-compensated current calculation. |
| VBUS | Analog input | Measures bus voltage (0–40 V) referenced to GND - used with current to compute real-time power (µW LSB) and energy (mJ LSB). |
| A0, A1 | Digital input | I²C address selection - each configurable to GND, SCL, SDA, or VS for up to 16 unique addresses on shared bus. |
| SDA, SCL | Digital I/O / Input | Open-drain I²C interface - supports standard/fast/high-speed modes; requires external pull-ups for proper bus signaling. |
| ALERT | Digital output | Open-drain fault indicator - asserts active-low on overcurrent, overvoltage, or temperature violation per configured thresholds. |
| VS, GND | Power supply / Ground | 2.7–5.5 V supply domain - decoupling capacitor (0.1 µF) required at VS pin to stabilize internal oscillator and ADC reference. |
Key Features
| Feature | Design Value |
|---|---|
| EZShunt™ integrated resistor | Factory-matched 800 µΩ shunt with Kelvin sensing eliminates layout sensitivity and external component tolerance stack-up. |
| Grade-B accuracy mode | Guarantees ±62.5 mA offset and ±1.25% gain error - enables single-point calibration in cost-sensitive industrial battery packs. |
| Programmable conversion timing | Independent 50 µs–4.12 ms settings per channel - balances noise reduction (longer TCT) against loop latency in closed-loop power control. |
| Background energy/charge accumulation | Hardware-accelerated integration - computes cumulative energy (mJ) and charge (µC) without host CPU intervention or timing jitter. |
| ±0.5% internal oscillator | Enables time-stamped power telemetry and accurate watt-hour/milliamp-hour metering without external crystal or timing circuitry. |
Applications
| Telecom Power Delivery | Industrial Battery Management |
|---|---|
|
Use Scenario: Real-time monitoring of 48 V DC distribution in 5G base station power shelves with dynamic load changes up to 30 A. IC Role / Device Role / Timing Role: Measures shunt voltage, bus voltage, and die temperature simultaneously; calculates power and alerts on overcurrent via ALERT pin within 50 µs conversion window. Use Value: Enables predictive thermal derating and load balancing using hardware-accumulated energy data - reduces need for host polling and firmware overhead. |
Use Scenario: Cell-level current/voltage/temperature tracking in 24 V lithium-ion battery packs for factory automation AGVs. IC Role / Device Role / Timing Role: Provides isolated, calibrated current sensing with integrated shunt - eliminates external sense resistor placement errors and PCB trace resistance uncertainty. Use Value: Delivers ±1.25% full-scale power accuracy across –40°C to +125°C ambient - supports ASIL-B–aligned functional safety diagnostics without recalibration. |
| Grid Infrastructure Monitoring | Enterprise Server PSU Telemetry |
|
Use Scenario: Bidirectional current measurement in solar microinverter DC-link monitoring where reverse current indicates grid feedback. IC Role / Device Role / Timing Role: Uses ±40 V common-mode range to measure high-side current on ungrounded PV strings; reports signed current values via I²C with 16-bit resolution. Use Value: Supports IEEE 1547-compliant anti-islanding detection by capturing sub-100 mA reverse current events with <1.2 mA LSB resolution. |
Use Scenario: Per-rail power telemetry in dual-ASIC server motherboards with 12 V, 5 V, and 3.3 V domains under transient loads >20 A. IC Role / Device Role / Timing Role: Configured with 1024× averaging on VBUS and shunt channels to suppress switching noise from VRMs while maintaining 1 ms update rate. Use Value: Achieves ±0.9% power accuracy at full scale - enables PMBus-compliant power budgeting and dynamic core throttling decisions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital power monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA229AIRGTR | 20-bit resolution, 0.1% oscillator, no integrated shunt - requires external 0.5 mΩ resistor and separate Kelvin routing. | Better resolution but higher BOM count and layout complexity; lacks EZShunt™ thermal stability. | Select when ultra-high precision (±0.1% gain error) is required and board space allows external shunt implementation. |
| INA745AIRELR | Same package and pinout; A-grade accuracy (±6.25 mA offset, ±0.75% gain error) - tighter initial tolerance but same drift specs. | Higher test cost and lower yield; suitable only where single-point calibration at room temperature suffices. | Choose for cost-sensitive applications needing guaranteed ±0.75% gain error without multi-temperature calibration. |
Compared with INA229AIRGTR, INA745BIRELR reduces layout risk and thermal drift via monolithic shunt integration; compared with INA745AIRELR, it trades initial offset accuracy for broader production yield and lower unit cost while retaining identical drift performance and feature set.
Availability
INA745BIRELR is available at Aetrix Electronics and suitable for telecom power delivery, industrial battery packs, and grid infrastructure monitoring requiring stable component supply, long-term lifecycle support, and guaranteed Grade-B accuracy performance.
Supply support for INA745BIRELR 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 metrology ICs.
The INA745x product line was designed specifically for high-accuracy, integrated-shunt digital power monitoring in space-constrained 40 V industrial and communications systems - eliminating external sense resistor design variables while maintaining metrological traceability.
FAQ
What is the maximum continuous current rating for INA745BIRELR?
The INA745BIRELR supports ±35 A continuous current at TA = 25°C, limited by thermal dissipation in the 14-pin QFN package. Its integrated 800 µΩ shunt yields ~1.2 W loss at 35 A, and the device's thermal design (RθJA = 103.3°C/W) ensures junction temperature remains below 150°C under typical PCB copper pour conditions. Peak capability reaches ±39.32 A, defined by ADC full-scale range.
Does INA745BIRELR require external calibration for Grade-B accuracy?
No, INA745BIRELR is factory-calibrated to meet Grade-B specifications (±62.5 mA offset, ±1.25% gain error) across temperature and common-mode voltage. Its on-die temperature sensor and internal shunt TC compensation eliminate need for system-level multi-point calibration - users can deploy with single-room-temperature verification and rely on datasheet-guaranteed drift performance.
How does the EZShunt™ technology in INA745BIRELR improve measurement stability?
EZShunt™ integrates a precision 800 µΩ Kelvin-connected resistor with matched thermal coupling to the die. This enables real-time temperature compensation of shunt resistance drift, achieving ±30 µA/°C offset drift and ±75 ppm/°C gain drift. Unlike discrete shunt solutions, it removes PCB trace resistance variation and thermal gradient errors - delivering stable accuracy from –40°C to +125°C without layout-dependent recalibration.
Can INA745BIRELR measure both high-side and low-side current configurations?
Yes, INA745BIRELR supports both configurations due to its –0.1 V to +40 V common-mode input range at IN+/IN– and VBUS pins - independent of the 2.7–5.5 V VS supply. In high-side mode, IS+/IS– connect to the positive rail and load; in low-side mode, they connect between load and ground. No level-shifting or isolation components are needed in either configuration.
What I²C address options are available on INA745BIRELR?
INA745BIRELR provides 16 programmable I²C addresses via A0 and A1 pins, each configurable to GND, SCL, SDA, or VS. This allows up to 16 devices on a single bus without address conflicts - critical in multi-rail server PSUs or distributed battery monitoring systems. Address decoding is handled entirely within the IC; no external logic is required.
INA745BIRELR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-VQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Monitor
- Sensing Method:
- High/Low-Side
- Accuracy:
- ±0.1%
- Voltage - Input:
- 2.7V ~ 5.5V
- Current - Output:
- 35A
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-VQFN (5x3)
INA745BIRELR FAQ
1.How can I place an order for INA745BIRELR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA745BIRELR 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 INA745BIRELR reliable?
The price and inventory of INA745BIRELR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA745BIRELR is usually 5 days.
3.What payment methods are accepted for INA745BIRELR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA745BIRELR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA745BIRELR?
INA745BIRELR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA745BIRELR 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 INA745BIRELR?
For technical support, including INA745BIRELR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA745BIRELR requirements.
6.How does Aetrix verify that INA745BIRELR is sourced from the original manufacturer or authorized distributors?
All INA745BIRELR 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 INA745BIRELR meets industry standards.
7.What is the process for return or replacement of INA745BIRELR?
All INA745BIRELR units undergo pre-shipment inspection (PSI). If there is an issue with INA745BIRELR, 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 INA745BIRELR part is unused and in its original packaging.
Return procedure for INA745BIRELR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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