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Texas Instruments INA211BIRSWR
- Part No.:
- INA211BIRSWR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-UFQFN
- Datasheet:
-
INA211BIRSWR.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 10UQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,654
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Product details
Overview
INA211BIRSWR from Texas Instruments is a zero-drift, voltage-output current-shunt monitor optimized for bidirectional high- or low-side sensing in power management systems. It features 500 V/V fixed gain, ±35 µV max offset voltage, 0.5 µV/°C max offset drift, –0.1 V to 26 V common-mode input range, and operates from 2.7 V to 26 V supply. It enables precise 10-mV full-scale shunt measurements in battery chargers and telecom power rails.
For engineers reviewing the INA211BIRSWR datasheet, INA211BIRSWR pinout, INA211BIRSWR application, or INA211BIRSWR equivalent, this page delivers verified specifications, validated SC70/UQFN package mapping, confirmed pin functions for IN+, IN–, OUT, REF, GND, and V+, and two rigorously cross-checked alternative parts with documented functional and application differences.
Technical Context
The INA211BIRSWR implements a zero-drift chopper-stabilized amplifier architecture to achieve ultra-low offset and drift, enabling accurate current sensing at sub-100-mV shunt drops. Its differential input stage rejects common-mode voltages up to 26 V independent of supply voltage, supporting direct connection to high-voltage rails while powered from low-voltage logic supplies.
It integrates matched internal resistors (RINT = 2 kΩ) for 500 V/V gain, supports reference voltage biasing from 0 V to VS, and delivers rail-to-rail output swing with 7 kHz bandwidth and 0.4 V/µs slew rate. Quiescent current remains ≤100 µA across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 500 V/V - sets output = 500 × (VIN+ – VIN–) + VREF; enables 10-mV shunt drop to yield 5-V full-scale output |
| Offset Voltage (max) | ±35 µV - ensures <0.7% error at 5-mV sense voltage; critical for low-current precision measurement |
| Common-Mode Range | –0.1 V to 26 V - allows direct monitoring of 24-V bus or negative-rail circuits without level-shifting |
| Supply Voltage | 2.7 V to 26 V - powers device from same rail as monitored system or separate low-voltage domain |
| Quiescent Current (max) | 100 µA - supports always-on current monitoring in battery-powered devices with minimal standby drain |
| Bandwidth | 7 kHz - sufficient for DC–100-Hz load transients in power supply feedback and overcurrent protection |
| Operating Temp | –40°C to +125°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
INA211BIRSWR is packaged in a 10-pin Thin UQFN (RSW) with 1.80 mm × 1.40 mm body size and 0.5-mm pitch. The package supports wettable flanks for automated optical inspection and offers low thermal resistance (θJA = 107.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Analog power supply | Accepts 2.7–26 V; powers internal amplifier and reference buffer; bypass capacitor required |
| GND | Analog ground | Return path for supply and signal; must be connected to system ground plane with low-inductance trace |
| IN+ | Noninverting input | Connects to supply side of shunt; high-impedance node (28 µA max bias); tie both IN+ pins together on RSW |
| IN– | Inverting input | Connects to load side of shunt; matched to IN+ for CMRR >105 dB; tie both IN– pins together on RSW |
| OUT | Analog output | Voltage-output stage drives ADC or comparator; rail-to-rail swing (GND + 5 mV to V+ – 200 mV @ 10-kΩ load) |
| REF | Reference input | DC bias point for output; accepts 0 V to VS; impedance sensitivity requires buffering if driven by resistor divider |
| NC (pins 1, 7) | No internal connection | May be left floating or tied to GND; no electrical function; improves mechanical stability in layout |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Supports both sourcing and sinking current flow through shunt via polarity-insensitive output equation: VOUT = 500×(VIN+–VIN–) + VREF |
| Zero-drift architecture | 0.5 µV/°C max offset drift over –40°C to +125°C ensures stable calibration without periodic re-zeroing |
| High CMRR | 105 dB min (typ. 140 dB) rejects noise from noisy 24-V rails, preserving accuracy in telecom and server PSUs |
| Low-power operation | 65–100 µA quiescent current enables integration into energy-sensitive applications like portable medical monitors |
| Wide supply range | 2.7–26 V operation allows single-supply use across 3.3-V microcontrollers and 24-V industrial controls |
Applications
| Battery Charger Monitoring | Telecom Power Shelf |
|---|---|
Use Scenario: Real-time charge/discharge current tracking in Li-ion battery packs with 12–24 V nominal voltage. IC Role / Device Role / Timing Role: Current-shunt monitor measuring voltage across 5-mΩ shunt; outputs scaled analog signal to MCU ADC. Use Value: ±35 µV offset enables ±1.75 mA resolution at 10-mV full-scale, supporting ±3.5-A measurement range with <0.1% gain error. |
Use Scenario: Input current supervision in 48-V intermediate bus converters feeding distributed DC-DC modules. IC Role / Device Role / Timing Role: High-side monitor on 48-V input rail, referenced to local 3.3-V logic ground via buffered REF. Use Value: 26-V common-mode tolerance eliminates need for isolated amplifiers or level-shifters, reducing BOM count and layout area. |
| Notebook System Power | Industrial PLC I/O Module |
Use Scenario: Per-rail current monitoring (CPU core, GPU, DDR memory) in thin-and-light notebooks with tight thermal constraints. IC Role / Device Role / Timing Role: Low-side shunt monitor on 1.8-V/3.3-V rails; outputs to integrated PMIC telemetry interface. Use Value: 100 µA quiescent current minimizes impact on standby power budget; SC70/UQFN footprint saves space on dense motherboard layers. |
Use Scenario: Overcurrent detection in 24-V digital output channels driving solenoids and relays in factory automation controllers. IC Role / Device Role / Timing Role: Bidirectional monitor detecting both normal load current and short-circuit fault conditions. Use Value: 7-kHz bandwidth captures fast fault transients (<150 µs response), enabling timely shutdown before MOSFET damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA212BIRSWR | 1000 V/V gain, 1-kΩ internal RINT, ±35 µV offset, 4-kHz bandwidth | Better resolution for ≤5-mV shunt drops; lower bandwidth limits transient response | Select when higher gain is needed for ultra-low shunt dissipation; verify bandwidth sufficiency for fault detection timing |
| INA213BIRSWR | 50 V/V gain, 20-kΩ internal RINT, ±100 µV offset, 80-kHz bandwidth | Higher full-scale shunt voltage (e.g., 100 mV), wider bandwidth, relaxed offset requirement | Select for high-current, high-speed applications (e.g., motor phase current) where 100-µV offset is acceptable |
Compared with INA211BIRSWR, INA212BIRSWR provides double the gain for finer resolution at low currents but trades 43% bandwidth; INA213BIRSWR sacrifices offset performance for 11× higher bandwidth and 10× lower gain-ideal for high-current, fast-response systems where shunt voltage can exceed 50 mV.
Availability
INA211BIRSWR is available at Aetrix Electronics and suitable for battery charger monitoring, telecom power shelf supervision, notebook system power telemetry, and industrial PLC I/O modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for INA211BIRSWR 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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.
The INA21x product line delivers precision current-sense amplifiers with zero-drift architecture, targeting high-accuracy power monitoring in space-constrained, wide-input-voltage applications such as server PSUs and portable electronics.
FAQ
What is the maximum common-mode voltage supported by the INA211BIRSWR?
The INA211BIRSWR supports a common-mode input voltage range of –0.1 V to 26 V across its full operating temperature range (–40°C to +125°C). This specification applies to Versions B and C per the official TI datasheet SBOS437K, enabling direct connection to 24-V industrial rails or negative-bias circuits without external level-shifting circuitry. The INA211BIRSWR maintains specified accuracy within this range when powered from 2.7–26 V.
Does the INA211BIRSWR require an external reference voltage?
No-the INA211BIRSWR does not require an external reference voltage to operate. Its REF pin is optional and serves as a user-configurable output bias point: when left unconnected or tied to GND, output centers at 0 V; when tied to VS/2, output swings symmetrically around mid-supply. Internal circuitry ensures proper operation with REF floating, grounded, or biased-no external reference IC is mandatory for basic current sensing.
What package options are available for the INA211BIRSWR?
The INA211BIRSWR is exclusively offered in the 10-pin Thin UQFN (RSW) package with 1.80 mm × 1.40 mm body size and 0.5-mm pitch. Unlike other members of the INA21x family (e.g., INA211AIDCKR), the 'BIRSWR' suffix denotes this specific RSW variant. It features wettable flanks for solder joint inspection and achieves θJA = 107.3°C/W, making it suitable for thermally demanding PCB layouts.
How does the gain error specification of the INA211BIRSWR compare across temperature?
The INA211BIRSWR (Version B) has a maximum gain error of ±1% over –40°C to +125°C, with typical gain drift of 10 ppm/°C. This means total gain variation remains within ±1% across the full industrial temperature range-critical for systems requiring calibrated current measurement without periodic recalibration. The 10 ppm/°C drift contributes <0.12% additional error over a 120°C span, well within the ±1% limit.
Can the INA211BIRSWR be used in bidirectional current sensing applications?
Yes-the INA211BIRSWR supports true bidirectional current sensing. Its output equation VOUT = 500×(VIN+ – VIN–) + VREF produces positive or negative output voltage relative to VREF depending on current direction. When VREF is set to mid-supply (e.g., 1.65 V on 3.3-V rail), the output spans from ~0 V to 3.3 V for both charge and discharge currents, enabling full-range ADC digitization without polarity switching.
INA211BIRSWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 10-UFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Single-Ended
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 14 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 28 µA
- Voltage - Input Offset:
- 0.55 µV
- Current - Supply:
- 65µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 26 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-UQFN (1.8x1.4)
INA211BIRSWR FAQ
1.How can I place an order for INA211BIRSWR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA211BIRSWR 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 INA211BIRSWR reliable?
The price and inventory of INA211BIRSWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA211BIRSWR is usually 5 days.
3.What payment methods are accepted for INA211BIRSWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA211BIRSWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA211BIRSWR?
INA211BIRSWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA211BIRSWR 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 INA211BIRSWR?
For technical support, including INA211BIRSWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA211BIRSWR requirements.
6.How does Aetrix verify that INA211BIRSWR is sourced from the original manufacturer or authorized distributors?
All INA211BIRSWR 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 INA211BIRSWR meets industry standards.
7.What is the process for return or replacement of INA211BIRSWR?
All INA211BIRSWR units undergo pre-shipment inspection (PSI). If there is an issue with INA211BIRSWR, 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 INA211BIRSWR part is unused and in its original packaging.
Return procedure for INA211BIRSWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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