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Texas Instruments INA211CIRSWT
- Part No.:
- INA211CIRSWT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-UFQFN
- Datasheet:
-
INA211CIRSWT.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 10UQFN
- Quantity:
- Payment:
- Shipping:
Inventory:568
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Product details
Overview
INA211CIRSWT from Texas Instruments is a precision voltage-output current-shunt monitor optimized for bidirectional, low- or high-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, and operates from 2.7 V to 26 V supply across –40°C to +125°C - enabling accurate 10-mV full-scale shunt measurements in notebook battery protection circuits.
For engineers reviewing the INA211CIRSWT datasheet, INA211CIRSWT pinout, INA211CIRSWT application, or INA211CIRSWT equivalent, this page delivers verified specifications, validated SC70/UQFN package mapping, confirmed pin functions, and real-world implementation context for current-sense amplifier selection in space-constrained, high-common-mode industrial and portable power designs.
Technical Context
The INA211CIRSWT implements a zero-drift chopper-stabilized architecture with matched input resistors (2 kΩ) and internal 500 V/V gain, supporting bidirectional current measurement via differential input (IN+, IN–) referenced to programmable REF. Its common-mode input range spans –0.1 V to 26 V independent of supply voltage, allowing direct sensing on 12-V or 24-V rails while powered from 3.3-V or 5-V logic supplies.
It delivers 7 kHz bandwidth (CLOAD = 10 pF), 0.4 V/µs slew rate, and 25 nV/√Hz input-referred voltage noise. Gain error is limited to ±0.5% over temperature (Version C), with 10 ppm/°C max gain drift and 105–140 dB CMRR - ensuring stable performance under dynamic load transients and noisy supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed Gain | 500 V/V - sets output scaling for 10-mV shunt drop → 5-V full-scale output, minimizing ADC resolution loss. |
| Max Offset Voltage | ±35 µV - enables accurate sub-100-mA current sensing with 10-mΩ shunts at room temperature. |
| Offset Drift | 0.5 µV/°C max - ensures <±0.5 mV total offset shift over –40°C to +125°C, critical for thermal stability. |
| Common-Mode Range | –0.1 V to 26 V - supports high-side sensing on 24-V bus without level-shifting or external biasing. |
| Supply Voltage | 2.7 V to 26 V - allows single-supply operation across wide-input DC-DC converters and battery-powered systems. |
| Quiescent Current | 100 µA max - enables always-on monitoring in low-power IoT and portable devices without significant battery drain. |
| Bandwidth | 7 kHz - sufficient for detecting overcurrent events and closed-loop feedback in SMPS and battery chargers. |
| Operating Temp | –40°C to +125°C - qualified for automotive under-hood, industrial motor control, and telecom power modules. |
Pinout & Package
INA211CIRSWT is available in the RSW (10-pin Thin UQFN) package, measuring 1.80 mm × 1.40 mm with 0.5-mm pitch. This thermally enhanced, leadless package provides low junction-to-board thermal resistance (18.7 °C/W) and supports high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Analog power supply | Accepts 2.7–26 V; must be decoupled with 0.01–0.1 µF capacitor close to pin for stability. |
| GND | Analog ground reference | Primary return path; requires low-impedance connection to system ground plane. |
| IN+ | Noninverting input | Connects to supply side of shunt resistor; two pins (2 & 3) must be tied together in RSW package. |
| IN− | Inverting input | Connects to load side of shunt resistor; two pins (4 & 5) must be tied together in RSW package. |
| REF | Reference input | Sets output common-mode level (0 V to V+); buffered reference required if driven by resistive divider. |
| OUT | Analog output | Voltage-output stage drives 10-kΩ load; swing is (V+) – 0.2 V to GND + 0.05 V over temperature. |
| NC | No internal connection | Pins 1 and 7 are unconnected; may be left floating or tied to GND for mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Eliminates 1/f noise and long-term drift, enabling stable 10-mV full-scale shunt measurements over time and temperature. |
| Bidirectional sensing capability | Supports both charging and discharging current detection in battery management systems using single-ended output. |
| High common-mode rejection | 105–140 dB CMRR maintains accuracy despite large supply rail noise or ground bounce in high-current paths. |
| Low quiescent current | 100 µA max enables integration into always-on fault-monitoring circuits without compromising system standby power. |
| SC70 and UQFN packaging | RSW (10-pin UQFN) option reduces board area by >50% vs SOIC, ideal for compact power modules and mobile adapters. |
| Extended temperature qualification | Specified from –40°C to +125°C meets AEC-Q200 stress test requirements for industrial and automotive power stages. |
Applications
| Power Supply Monitoring | Battery Protection Circuitry |
|---|---|
|
Use Scenario: Real-time current monitoring in 12-V DC-DC converter outputs feeding FPGA or ASIC power rails. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting shunt voltage to scaled analog output for ADC sampling. Use Value: Enables overcurrent shutdown within 100 µs using 7-kHz bandwidth and low propagation delay, protecting downstream silicon. |
Use Scenario: Bidirectional charge/discharge current tracking in lithium-ion battery packs for portable medical devices. IC Role / Device Role / Timing Role: Precision shunt monitor interfacing directly to microcontroller ADC with 500 V/V gain scaling. Use Value: ±35 µV offset allows detection of <10 mA discharge current using 10-mΩ shunt, extending runtime estimation accuracy. |
| Telecom Rectifier Modules | Notebook Computer Power Management |
|
Use Scenario: Input current supervision in 48-V telecom rectifier units with hot-swap controllers. IC Role / Device Role / Timing Role: High-common-mode (up to 26 V) current sensor operating from isolated 3.3-V auxiliary supply. Use Value: –0.1 V to 26 V common-mode range eliminates need for level-shifters or isolated amplifiers, reducing BOM cost. |
Use Scenario: System-level power budgeting in ultrabooks using multiple parallel 3.3-V/5-V/12-V rails. IC Role / Device Role / Timing Role: Low-quiescent-current (100 µA) monitor enabling continuous current logging during S0ix sleep states. Use Value: 100 µA IQ permits always-on monitoring without violating platform idle power targets (<5 mW per rail). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA212CIRSWT | 1000 V/V gain, ±35 µV offset, 4 kHz bandwidth - higher gain but lower BW than INA211CIRSWT. | Better suited for ultra-low shunt drops (<5 mV); less responsive to fast transients due to reduced bandwidth. | Select when maximizing sensitivity on sub-5-mΩ shunts outweighs need for rapid overcurrent response. |
| INA213CIRSWT | 50 V/V gain, ±100 µV offset, 80 kHz bandwidth - lower gain, higher offset, significantly higher BW. | Optimized for high-current, high-speed applications (e.g., motor phase current) where 100-mV shunt drops are acceptable. | Choose when measuring >1-A currents with 100-mΩ shunts and requiring faster transient detection than 7 kHz allows. |
Compared with INA211CIRSWT, INA212CIRSWT trades bandwidth for higher gain sensitivity, while INA213CIRSWT sacrifices offset precision for speed and dynamic range - making INA211CIRSWT the balanced choice for general-purpose 10–100 mA sensing with thermal stability and layout simplicity.
Availability
INA211CIRSWT is available at Aetrix Electronics and suitable for notebook computers, telecom rectifier modules, and battery protection circuits requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for INA211CIRSWT 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 signal conditioning and power management ICs.
The INA21x series was designed specifically for high-accuracy, low-power current sensing in space-constrained, high-common-mode applications - targeting battery management, server power, and industrial automation systems.
FAQ
What is the maximum common-mode voltage supported by the INA211CIRSWT?
The INA211CIRSWT 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 specifically to Version C devices like INA211CIRSWT and enables reliable high-side sensing on 24-V industrial buses without external level-shifting circuitry. The device maintains accuracy even when VIN+ exceeds the V+ supply rail by up to 13 V.
Does the INA211CIRSWT require external calibration for offset error?
No, the INA211CIRSWT does not require external calibration for offset error. Its zero-drift architecture guarantees a maximum input offset voltage of ±35 µV at 25°C and ±0.5 µV/°C drift over –40°C to +125°C. This inherent stability eliminates the need for factory or field calibration in most applications, including battery fuel gauging and power supply current monitoring where long-term drift would otherwise degrade accuracy.
Can the INA211CIRSWT be used for bidirectional current sensing?
Yes, the INA211CIRSWT supports true bidirectional current sensing. By setting the REF pin to mid-supply (e.g., V+/2), the output voltage centers at that reference - rising for current in one direction and falling for the opposite direction. This configuration is explicitly validated in TI's SBOS437K datasheet and widely implemented in lithium-ion battery protection circuits where charge and discharge currents must be independently monitored using a single shunt resistor.
What is the recommended bypass capacitor for the V+ pin of the INA211CIRSWT?
The recommended bypass capacitor for the V+ pin of the INA211CIRSWT is 0.01 µF to 0.1 µF, placed as close as possible to the pin. TI's datasheet specifies this range for stability across all operating conditions. For noisy environments (e.g., switch-mode power supplies), adding a parallel 1-µF ceramic capacitor improves high-frequency noise rejection without affecting loop stability. Avoid tantalum or electrolytic capacitors due to ESR-related instability risks.
How does the RSW (UQFN) package of the INA211CIRSWT improve thermal performance compared to SC70?
The RSW (10-pin Thin UQFN) package of the INA211CIRSWT achieves a junction-to-board thermal resistance (RθJB) of 18.7 °C/W - more than 3× better than the SC70 package's 72.1 °C/W. This improvement results from the UQFN's exposed thermal pad and shorter internal thermal paths, enabling higher continuous current handling in compact layouts. In practice, this allows sustained operation at full rated current in thermally constrained spaces like USB-C PD adapters and embedded power modules.
INA211CIRSWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 10-UFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Single-Ended
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 7 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)
INA211CIRSWT FAQ
1.How can I place an order for INA211CIRSWT through Aetrix?
Please submit a Request for Quotation (RFQ) for INA211CIRSWT 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 INA211CIRSWT reliable?
The price and inventory of INA211CIRSWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA211CIRSWT is usually 5 days.
3.What payment methods are accepted for INA211CIRSWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA211CIRSWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA211CIRSWT?
INA211CIRSWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA211CIRSWT 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 INA211CIRSWT?
For technical support, including INA211CIRSWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA211CIRSWT requirements.
6.How does Aetrix verify that INA211CIRSWT is sourced from the original manufacturer or authorized distributors?
All INA211CIRSWT 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 INA211CIRSWT meets industry standards.
7.What is the process for return or replacement of INA211CIRSWT?
All INA211CIRSWT units undergo pre-shipment inspection (PSI). If there is an issue with INA211CIRSWT, 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 INA211CIRSWT part is unused and in its original packaging.
Return procedure for INA211CIRSWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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