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Texas Instruments INA211CIRSWR
- Part No.:
- INA211CIRSWR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-UFQFN
- Datasheet:
-
INA211CIRSWR.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 10UQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,027
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Product details
Overview
INA211CIRSWR from Texas Instruments is a voltage-output, bidirectional current-shunt monitor with zero-drift architecture, designed for high-accuracy low- or high-side current sensing in power rails up to 26 V. It features a fixed gain of 500 V/V, ±35 µV maximum offset voltage, 0.5 µV/°C max offset drift, ±0.5% max gain error over temperature, and operates from 2.7 V to 26 V supply with 100 µA max quiescent current. It enables precise 10-mV full-scale shunt measurements in battery chargers and telecom power management.
For engineers reviewing the INA211CIRSWR datasheet, INA211CIRSWR pinout, INA211CIRSWR application, or INA211CIRSWR 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 - all aligned to TI's SBOS437K revision November 2023 datasheet.
Technical Context
The INA211CIRSWR implements a zero-drift chopper-stabilized amplifier topology that maintains ±35 µV input offset and 0.5 µV/°C drift across –40°C to +125°C. Its differential input stage supports common-mode voltages from –0.1 V to 26 V independent of supply, enabling direct sensing on 12-V or 24-V rails while powered from 3.3-V or 5-V logic supplies.
With 500 V/V fixed gain, it converts 10-mV shunt drops into 5-V output signals compatible with standard ADC reference ranges. Its 7-kHz bandwidth (CLOAD = 10 pF), 105–140 dB CMRR, and 25 nV/√Hz input-referred noise support stable, high-resolution current monitoring in noisy power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 500 V/V - scales 10-mV shunt voltage to 5-V output, matching 5-V ADC full-scale without external scaling |
| Input Offset Voltage (max) | ±35 µV - enables accurate sub-100-mA current measurement with 100-mΩ shunt at 10-mV full-scale |
| Offset Drift (max) | 0.5 µV/°C - contributes ≤6 µV error over –40°C to +125°C, preserving <0.1% measurement accuracy |
| Gain Error (max, –40°C to +125°C) | ±0.5% - limits full-scale error to ±25 mV on 5-V output, critical for closed-loop battery charge control |
| Common-Mode Range | –0.1 V to 26 V - supports high-side sensing on 24-V industrial rails and low-side sensing near ground |
| Supply Voltage Range | 2.7 V to 26 V - allows single-supply operation from 3.3-V microcontrollers while monitoring 12-V/24-V power paths |
| Quiescent Current (max) | 100 µA - enables always-on current monitoring in battery-backed systems with minimal standby drain |
Pinout & Package
The INA211CIRSWR is packaged in the RSW (10-pin Thin UQFN) variant, measuring 1.80 mm × 1.40 mm with 0.4-mm pitch. This thermally enhanced package delivers 107.3°C/W junction-to-ambient resistance and supports reflow-compatible PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Analog power supply | Accepts 2.7–26 V; powers internal amplifier and reference buffer; requires 0.1-µF bypass capacitor to GND |
| GND | Analog ground | Reference node for all analog circuitry; must be tied to system power ground with low-impedance path |
| IN+ | Noninverting input | Connects to supply-side of shunt resistor; matched with IN− for differential sensing; two pins (2 & 3) must be shorted |
| IN− | Inverting input | Connects to load-side of shunt resistor; forms differential pair with IN+; two pins (4 & 5) must be shorted |
| REF | Reference input | Sets output common-mode level; accepts 0–V+ voltage; unbuffered - requires low-impedance source or op-amp buffer |
| OUT | Analog output | Voltage-output stage drives 10-kΩ loads; swings within 50 mV of V+ and 5 mV of GND at full temperature range |
| NC (pins 1, 7) | No internal connection | Not bonded; may be left floating or tied to GND for mechanical stability; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Eliminates 1/f noise and thermal drift, enabling stable 10-mV full-scale shunt measurements over temperature and time |
| Bidirectional current sensing | Supports both charging and discharging current detection via polarity-sensitive output relative to REF |
| High common-mode rejection | 105–140 dB CMRR ensures immunity to rail noise when monitoring 12-V/24-V supplies with 3.3-V logic |
| Low quiescent current | 100 µA max enables integration into energy-sensitive applications like portable medical devices and IoT edge nodes |
| Wide supply range | 2.7–26 V operation allows shared supply with host MCU or independent biasing from main power rail |
Applications
| Power Supply Monitoring | Battery Charge Control |
|---|---|
Use Scenario: Real-time monitoring of 12-V DC-DC converter output current in telecom base station power modules. IC Role / Device Role / Timing Role: High-side current-shunt monitor converting shunt voltage to amplified analog output for ADC digitization. Use Value: Enables dynamic load balancing and overcurrent shutdown with ±0.5% gain accuracy and 10-mV resolution, reducing thermal stress on power MOSFETs. |
Use Scenario: Bidirectional current sensing during Li-ion battery charging/discharging cycles in notebook computers. IC Role / Device Role / Timing Role: Precision current amplifier feeding microcontroller ADC to compute state-of-charge and detect fault conditions. Use Value: ±35 µV offset supports accurate coulomb counting at low currents (<100 mA), extending battery life estimation fidelity. |
| Industrial Motor Drive Protection | Server PSU Health Management |
Use Scenario: Low-side current monitoring on H-bridge phase legs in 24-V brushless motor controllers. IC Role / Device Role / Timing Role: Fast-response current sense amplifier providing real-time feedback for PWM current limiting. Use Value: 7-kHz bandwidth and 0.4 V/µs slew rate ensure timely detection of short-circuit events before IGBT damage occurs. |
Use Scenario: Input current monitoring on redundant 48-V server power supplies to detect aging or imbalance. IC Role / Device Role / Timing Role: High-accuracy shunt monitor interfaced to BMC via SAR ADC for predictive maintenance analytics. Use Value: 0.5 µV/°C drift guarantees long-term calibration stability across 0–70°C ambient, reducing field recalibration frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA210AIRSWR | 200 V/V gain, ±0.5% gain error, same package and temp range | Better suited for higher shunt drops (e.g., 25-mV full-scale); lower bandwidth (14 kHz) | Select when system uses ≥25-mΩ shunts and prioritizes bandwidth over resolution |
| INA212CIRSWR | 1000 V/V gain, ±0.5% gain error, same package and temp range | Enables 5-mV full-scale sensing; reduced bandwidth (4 kHz); higher noise sensitivity | Select for ultra-low-current applications (<50 mA) where 5-mV shunt drop is mandatory |
Compared with INA210AIRSWR and INA212CIRSWR, the INA211CIRSWR provides optimal balance of resolution (10-mV full-scale), bandwidth (7 kHz), and noise performance (25 nV/√Hz) for mid-range current monitoring in telecom and computing power supplies - avoiding the bandwidth penalty of INA212 and the reduced resolution of INA210.
Availability
INA211CIRSWR is available at Aetrix Electronics and suitable for power supply monitoring, battery charge control, industrial motor drive protection, and server PSU health management requiring stable component supply and guaranteed long-term sourcing.
Supply support for INA211CIRSWR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The INA21x product line was engineered specifically for precision bidirectional current sensing in space-constrained, high-voltage power systems - emphasizing zero-drift stability, wide common-mode tolerance, and low-power operation across –40°C to +125°C.
FAQ
What is the maximum common-mode voltage supported by the INA211CIRSWR?
The INA211CIRSWR 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 per TI's SBOS437K datasheet. The –0.1 V lower limit enables true low-side sensing near ground, while the 26-V upper limit permits direct monitoring of 24-V industrial rails without level-shifting circuitry. The INA211CIRSWR maintains specified accuracy within this range independent of its 2.7–26 V supply voltage.
Does the INA211CIRSWR require an external reference voltage?
The INA211CIRSWR does not require an external reference voltage to operate, but its REF pin must be actively driven to define the output common-mode level. The REF pin accepts any voltage from 0 V to V+, and the output is given by VOUT = (ISHUNT × RSHUNT) × 500 + VREF. If referenced to GND, output swings from ~5 mV to (V+ – 50 mV); if biased to V+/2, output centers at mid-supply. TI recommends buffering REF with a low-impedance source or op-amp to preserve CMRR.
What is the bandwidth and slew rate of the INA211CIRSWR?
The INA211CIRSWR has a small-signal bandwidth of 7 kHz when loaded with 10 pF, as specified in TI's SBOS437K datasheet. Its slew rate is 0.4 V/µs, enabling step response settling within microseconds for typical current transients. These values are measured under standard test conditions (VS = 12 V, VCM = 12 V, VREF = VS/2). Bandwidth decreases with increasing capacitive load; for stable operation, keep total load capacitance ≤1 nF and use local 0.1-µF bypassing at V+.
Can the INA211CIRSWR perform bidirectional current sensing?
Yes, the INA211CIRSWR supports bidirectional current sensing by leveraging its differential input architecture and user-configurable REF pin. When current flows from IN+ to IN−, VOUT rises above VREF; when current reverses, VOUT falls below VREF. With VREF set to mid-supply (e.g., 2.5 V on a 5-V rail), the output spans ~2.5 V ±2.5 V for full-scale ±10-mA shunt current. This capability is explicitly confirmed for INA211 in the device family description and functional block diagram of SBOS437K.
What package variants are available for the INA211CIRSWR?
INA211CIRSWR is exclusively offered in the RSW package: a 10-pin Thin UQFN measuring 1.80 mm × 1.40 mm with 0.4-mm pitch. This differs from the DCK (SC70-6) package used by other INA21x variants. The RSW package provides superior thermal performance (107.3°C/W θJA) and dual-input pins (IN+ on pins 2&3, IN− on pins 4&5) that must be shorted externally. No SC70 variant exists for the INA211CIRSWR part number.
INA211CIRSWR 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:
- 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)
INA211CIRSWR FAQ
1.How can I place an order for INA211CIRSWR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA211CIRSWR 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 INA211CIRSWR reliable?
The price and inventory of INA211CIRSWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA211CIRSWR is usually 5 days.
3.What payment methods are accepted for INA211CIRSWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA211CIRSWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA211CIRSWR?
INA211CIRSWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA211CIRSWR 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 INA211CIRSWR?
For technical support, including INA211CIRSWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA211CIRSWR requirements.
6.How does Aetrix verify that INA211CIRSWR is sourced from the original manufacturer or authorized distributors?
All INA211CIRSWR 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 INA211CIRSWR meets industry standards.
7.What is the process for return or replacement of INA211CIRSWR?
All INA211CIRSWR units undergo pre-shipment inspection (PSI). If there is an issue with INA211CIRSWR, 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 INA211CIRSWR part is unused and in its original packaging.
Return procedure for INA211CIRSWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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