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Texas Instruments INA212BIRSWR
- Part No.:
- INA212BIRSWR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-UFQFN
- Datasheet:
-
INA212BIRSWR.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 10UQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,599
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Product details
Overview
INA212BIRSWR from Texas Instruments is a precision bidirectional current-shunt monitor in the zero-drift INA21x family, designed for high-side or low-side sensing in power management systems. It delivers 1000 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 battery chargers and telecom equipment.
For engineers reviewing the INA212BIRSWR datasheet, INA212BIRSWR pinout, INA212BIRSWR application, or INA212BIRSWR equivalent, this page provides verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The INA212BIRSWR implements a zero-drift chopper-stabilized amplifier architecture optimized for bidirectional current sensing across wide common-mode voltages (–0.1 V to 26 V). Its differential input stage rejects common-mode transients while maintaining 105 dB min CMRR over temperature.
It features a fixed 1000 V/V gain set by internal thin-film resistors, supports reference voltage injection at the REF pin for level-shifting output, and draws only 100 µA max quiescent current - making it suitable for always-on monitoring in energy-constrained systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 1000 V/V - enables 10-mV shunt drop to produce full-scale 10-V output, reducing I²R loss by 90% vs. 100-mV alternatives |
| Offset Voltage (max) | ±35 µV - ensures ≤0.35% error at 10-mV full-scale input, critical for low-current precision measurement |
| Offset Drift (max) | 0.5 µV/°C - maintains accuracy across –40°C to +125°C without calibration |
| Common-Mode Range | –0.1 V to 26 V - supports high-side sensing on 24-V rails while powered from 3.3-V logic supply |
| Supply Voltage Range | 2.7 V to 26 V - allows direct operation from battery or intermediate rail without LDO |
| Quiescent Current (max) | 100 µA - enables integration into always-on subsystems without significant standby power penalty |
| Bandwidth | 4 kHz - sufficient for DC and slow-varying load currents (e.g., battery charge/discharge profiling) |
Pinout & Package
INA212BIRSWR 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 thermal performance of 107.3°C/W junction-to-ambient and requires solder reflow per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Analog input (non-inverting) | Connects to supply side of shunt; accepts common-mode up to 26 V independent of V+ |
| IN− | Analog input (inverting) | Connects to load side of shunt; differential input defines sensed current polarity |
| OUT | Analog output | Voltage output = (ISHUNT × RSHUNT) × 1000 + VREF; rail-to-rail swing within 50 mV of V+ and 5 mV of GND |
| REF | Analog reference input | DC bias point for output; sets output common-mode; 0 V to V+ range, high-impedance |
| V+ | Power supply | Single 2.7–26 V analog supply; powers internal amplifier and reference buffer |
| GND | Analog ground | Return path for supply and signal; must be star-connected to shunt ground for accuracy |
| NC (pins 1, 7) | No connection | Internally unconnected; may be left floating or tied to GND for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Supports both charging and discharging current flow detection via polarity-sensitive output voltage relative to REF |
| Zero-drift architecture | Eliminates 1/f noise and long-term drift; enables stable 10-mV full-scale operation over full temperature range |
| High common-mode rejection | 105 dB min CMRR ensures immunity to supply ripple and switching noise in noisy 24-V systems |
| Reference voltage flexibility | REF pin allows output level-shifting (e.g., 0–5 V output with 2.5 V REF), simplifying ADC interface design |
| Low-power operation | 100 µA max IQ permits continuous monitoring in battery-backed or energy-harvesting applications |
Applications
| Server Power Supply Monitoring | USB-C PD Battery Protection |
|---|---|
Use Scenario: Real-time current monitoring on 12-V intermediate bus feeding multi-phase VRMs in data center servers. IC Role / Device Role / Timing Role: High-side current-shunt monitor providing isolated analog feedback to PMBus controller for dynamic load-line adjustment. Use Value: 1000 V/V gain and 26-V common-mode range enable direct sensing on 12-V rail without level-shifting; ±35 µV offset ensures <1% error at 10-A load with 1-mΩ shunt. |
Use Scenario: Bidirectional current measurement in USB-C Power Delivery sink for charge/discharge state detection and overcurrent shutdown. IC Role / Device Role / Timing Role: Low-side shunt amplifier feeding ADC input of microcontroller managing battery fuel gauge and protection logic. Use Value: Zero-drift performance maintains accuracy across –40°C to +85°C ambient; 100 µA IQ avoids draining battery during sleep mode. |
| Telecom 48-V DC Distribution | Lithium-Ion Charger Management |
Use Scenario: Input current supervision on 48-V telecom rectifier outputs feeding distributed power modules. IC Role / Device Role / Timing Role: High-side monitor interfaced to isolated sigma-delta ADC for system-level power telemetry and fault logging. Use Value: –0.1 V to 26 V common-mode range accommodates transient overshoots up to 26 V while operating from local 3.3-V supply - eliminating need for isolated supply. |
Use Scenario: Precision current sensing in constant-current/constant-voltage lithium-ion charger for portable medical devices. IC Role / Device Role / Timing Role: Low-side current amplifier driving 12-bit SAR ADC to regulate charge termination at ±1% current accuracy. Use Value: 0.5 µV/°C offset drift ensures <0.5% total error over 0–50°C battery temperature range, meeting IEC 62368-1 safety margin requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA213BIRSWR | 50 V/V gain, ±100 µV max offset, 80 kHz bandwidth | Better suited for higher shunt drops (>60 mV) and faster transient response in motor control | Select when measuring larger currents with >50-mΩ shunts or requiring >10× higher bandwidth than INA212BIRSWR |
| INA226AIRSAT | I²C digital output, 16-bit resolution, integrated 0.1-Ω shunt, 26-V common-mode | Replaces analog signal chain with digital interface; includes internal calibration and alert functions | Select when system already uses I²C infrastructure and requires programmable gain, averaging, or fault registers - not for analog-loop feedback |
Compared with INA212BIRSWR, INA213BIRSWR trades gain and offset for bandwidth and headroom, while INA226AIRSAT replaces analog output with digital intelligence - neither is pin-compatible, but both address overlapping current-sensing use cases with distinct system-level trade-offs.
Availability
INA212BIRSWR is available at Aetrix Electronics and suitable for server power supplies, USB-C PD battery protection, telecom 48-V distribution, and lithium-ion charger management requiring stable component supply and guaranteed long-term manufacturability.
Supply support for INA212BIRSWR 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 product line was engineered specifically for high-accuracy, low-power current sensing in space-constrained, thermally demanding applications - including computing, telecom, and portable energy systems.
FAQ
What is the maximum common-mode voltage the INA212BIRSWR can measure?
The INA212BIRSWR supports a common-mode input voltage range of –0.1 V to 26 V across its IN+ and IN– pins. This specification applies to Versions B and C (the 'B' suffix in INA212BIRSWR confirms Version B), enabling reliable high-side sensing on 24-V rails even when powered from a lower supply like 3.3 V or 5 V. Operation beyond 26 V requires external transient protection circuitry.
Does the INA212BIRSWR support bidirectional current sensing?
Yes, the INA212BIRSWR supports true bidirectional current sensing. Its output voltage is defined as VOUT = (ISHUNT × RSHUNT) × 1000 + VREF. By setting VREF to mid-supply (e.g., 1.65 V on 3.3-V system), positive current produces output above VREF, and negative current produces output below VREF - allowing unambiguous direction detection with a single-ended ADC.
What package type does the INA212BIRSWR use, and what are its thermal characteristics?
The INA212BIRSWR uses the RSW package: a 10-pin Thin UQFN with 1.80 mm × 1.40 mm body size and 0.5-mm pitch. Its thermal resistance is 107.3°C/W junction-to-ambient (RθJA) and 18.7°C/W junction-to-board (RθJB). Proper PCB layout with ≥4 thermal vias under the exposed pad is required to achieve rated performance in continuous 100-µA operation.
Can the INA212BIRSWR operate from a 3.3-V supply while measuring a 24-V rail?
Yes, the INA212BIRSWR can operate from a 3.3-V supply while accurately measuring current on a 24-V rail. Its common-mode range (–0.1 V to 26 V) and supply-independent input stage allow IN+ and IN– to sit at 24 V while V+ is at 3.3 V. The output swings from ~5 mV to ~3.25 V (rail-to-rail), compatible with standard 3.3-V ADCs when REF is set to 0 V or GND.
What is the gain error specification for the INA212BIRSWR over temperature?
The INA212BIRSWR (Version B) has a maximum gain error of ±1% over the full operating temperature range of –40°C to +125°C. Additionally, its gain drift is limited to 10 ppm/°C, meaning gain variation due to temperature alone contributes less than ±0.12% over a 120°C span - ensuring predictable scaling in uncalibrated systems.
INA212BIRSWR 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)
INA212BIRSWR FAQ
1.How can I place an order for INA212BIRSWR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA212BIRSWR 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 INA212BIRSWR reliable?
The price and inventory of INA212BIRSWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA212BIRSWR is usually 5 days.
3.What payment methods are accepted for INA212BIRSWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA212BIRSWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA212BIRSWR?
INA212BIRSWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA212BIRSWR 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 INA212BIRSWR?
For technical support, including INA212BIRSWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA212BIRSWR requirements.
6.How does Aetrix verify that INA212BIRSWR is sourced from the original manufacturer or authorized distributors?
All INA212BIRSWR 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 INA212BIRSWR meets industry standards.
7.What is the process for return or replacement of INA212BIRSWR?
All INA212BIRSWR units undergo pre-shipment inspection (PSI). If there is an issue with INA212BIRSWR, 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 INA212BIRSWR part is unused and in its original packaging.
Return procedure for INA212BIRSWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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