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Texas Instruments INA190A2IRSWT
- Part No.:
- INA190A2IRSWT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-UFQFN
- Datasheet:
-
INA190A2IRSWT.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 10UQFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,778
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Product details
Overview
INA190A2IRSWT from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier in a 10-pin UQFN package, featuring 50 V/V fixed gain, ±15 µV max offset voltage, 132 dB min CMRR, and –0.2 V to +40 V wide common-mode input range. It enables microamp-level current measurement in battery-powered systems with rail-to-rail output swing and 100 nA max shutdown current.
For engineers reviewing the INA190A2IRSWT datasheet, INA190A2IRSWT pinout, INA190A2IRSWT application, or INA190A2IRSWT equivalent, this page delivers verified specifications, validated pin functions for the RSW package, real-world use cases in high-side/low-side sensing, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The INA190A2IRSWT uses a capacitively coupled front-end architecture to achieve ultra-low input bias current (0.5 nA typ) and high common-mode rejection (132 dB min), enabling accurate sensing at sub-millivolt differential voltages across shunts up to 40 V above ground. Its zero-drift design maintains offset stability over temperature (80 nV/°C max drift), critical for long-duration battery monitoring.
Operating from 1.7 V to 5.5 V supply, it delivers 37 kHz bandwidth at 50 V/V gain with 0.3 V/µs slew rate and settles within 30 µs to 1% of final value. The ENABLE pin (Pin 7) controls power state, reducing quiescent current to 100 nA max in shutdown while placing OUT in high-impedance mode - essential for intermittent sampling in energy-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50 V/V - provides 50× amplification of shunt voltage drop, enabling precise low-current detection with standard ADC input ranges. |
| Offset Voltage | ±15 µV max - ensures <1 µA error at 20 mΩ shunt, supporting microamp-level current resolution without calibration. |
| Common-Mode Range | –0.2 V to +40 V - supports direct high-side sensing on 36-V bus rails independent of 1.8–5.5 V supply voltage. |
| CMRR | 132 dB min - rejects >200,000:1 common-mode noise, critical for stable readings during load transients or EMI exposure. |
| Quiescent Current | 65 µA typ enabled / 100 nA max disabled - extends battery life in portable devices by >100× when idle between measurements. |
| Bandwidth | 37 kHz - captures fast current events (e.g., inrush, short-circuit) while maintaining DC accuracy for steady-state monitoring. |
| Input Bias Current | 0.5 nA typ - permits use of high-value shunts (>1 kΩ) for nanoamp current sensing without loading error. |
Pinout & Package
INA190A2IRSWT is housed in a 10-pin UQFN (RSW) package measuring 1.80 mm × 1.40 mm with wettable flanks, optimized for space-constrained PCB layouts and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | REF | Analog reference input - sets output midpoint for bidirectional sensing; applying VS/2 enables symmetric ±200 mV output swing around 2.5 V. |
| 2 | GND | Analog ground - primary return path for sense current and internal circuitry; must be connected to low-impedance system ground plane. |
| 3 | VS | Power supply input - accepts 1.7–5.5 V; bypassing with 0.1 µF ceramic capacitor near pin is mandatory for stability. |
| 4 | IN+ | Positive current-sense input - connects to bus side of shunt in high-side config or load side in low-side config. |
| 5 | IN− | Negative current-sense input - connects to load side of shunt in high-side config or ground side in low-side config. |
| 6 | NC | No connect - internally unconnected; must be left floating or tied to GND/VS per layout guidelines. |
| 7 | ENABLE | Digital enable control - driven to VS for active operation; pulled to GND to disable device and reduce supply current to ≤100 nA. |
| 8 | NC | No connect - internally unconnected; must be left floating or tied to GND/VS per layout guidelines. |
| 9 | GND | Second analog ground - provides additional low-impedance return path; must be connected to same ground plane as Pin 2. |
| 10 | OUT | Analog voltage output - delivers gain × (IN+ − IN−) + VREF; high-impedance when ENABLE = GND. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Enabled via external REF voltage - allows single-supply measurement of charge/discharge currents in battery management without polarity switching. |
| Zero-drift architecture | 80 nV/°C max offset drift - eliminates thermal-induced gain errors in automotive or industrial environments operating from –40°C to +125°C. |
| Rail-to-rail output | Swings to GND + 1 mV and VS – 40 mV - maximizes dynamic range on 1.8-V supplies, delivering >1.7 V full-scale output for 12-bit ADC compatibility. |
| Ultra-low input bias | 0.5 nA typ - enables use of 100 Ω–10 kΩ shunts for microamp sensing while avoiding signal attenuation or thermal EMF errors. |
| High CMRR | 132 dB min - suppresses interference from adjacent switching regulators or motor drivers, ensuring stable readings in noisy embedded systems. |
Applications
| Smartphone Battery Monitoring | Server PSU Current Protection |
|---|---|
|
Use Scenario: Real-time tracking of charging/discharging current in Li-ion battery packs during fast-charge cycles and standby states. IC Role / Device Role / Timing Role: Precision current-sense amplifier providing bidirectional analog output to MCU's ADC, synchronized with charge controller commands. Use Value: Enables <1% full-scale current accuracy across –20°C to +60°C ambient, supporting JEITA-compliant thermal regulation and capacity estimation. |
Use Scenario: Overcurrent detection and telemetry in 12-V/48-V server power supply units with multiple output rails. IC Role / Device Role / Timing Role: High-side current monitor feeding fault logic and digital power management ICs via isolated analog interface. Use Value: Withstands 40-V bus transients while delivering 37-kHz response to detect short-circuit events within 30 µs, meeting IEC 62368-1 safety timing requirements. |
| Industrial IoT Sensor Node | USB-C PD Power Delivery |
|
Use Scenario: Low-power current monitoring in battery-operated edge sensors transmitting data over LoRaWAN or NB-IoT. IC Role / Device Role / Timing Role: Enable-controlled current sensor activated only during scheduled measurement windows to minimize average system current. Use Value: 100 nA shutdown current extends 10-year battery life in sealed enclosures; 50 V/V gain matches 100-mΩ shunt to 0–3.3 V ADC range. |
Use Scenario: Accurate current reporting in USB-C power delivery controllers managing up to 100 W bidirectional power flow. IC Role / Device Role / Timing Role: Bidirectional current amplifier interfacing with PD controller's analog monitoring inputs for real-time power negotiation. Use Value: ±15 µV offset ensures <0.1% error at 5 A with 10-mΩ shunt, satisfying USB-IF compliance for ±3% total power measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA219BIDR | I²C digital output, 16-bit ADC integrated; no ENABLE pin; 26 V max common-mode; 0.1% gain error. | Requires MCU I²C interface and firmware support; unsuitable for analog-loop feedback or high-voltage (>26 V) sensing. | Select when digital output, onboard ADC, and compact BGA packaging outweigh need for analog output or 40-V common-mode range. |
| MAX4008AASA+ | Fixed 20 V/V gain; 100 µA quiescent current; no ENABLE; 28 V max common-mode; 120 dB CMRR. | Lacks bidirectional capability and ultra-low bias current; limited to unidirectional 24-V systems with relaxed accuracy needs. | Select for cost-sensitive, single-supply 24-V industrial controls where 50 V/V gain and microamp sensing are unnecessary. |
Compared with INA190A2IRSWT, INA219BIDR trades analog simplicity for digital integration and reduced MCU resource usage, while MAX4008AASA+ offers lower cost but sacrifices 40-V common-mode tolerance, bidirectionality, and sub-µA bias current - making INA190A2IRSWT optimal for high-accuracy, high-voltage, battery-sensitive designs.
Availability
INA190A2IRSWT is available at Aetrix Electronics and suitable for smartphone battery management, server PSU protection, and industrial IoT sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for INA190A2IRSWT 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 INA190 product line was designed specifically for high-accuracy, low-power current sensing in battery-powered and high-voltage industrial systems - emphasizing zero-drift performance, wide common-mode operation, and enable-controlled energy efficiency.
FAQ
What is the maximum common-mode voltage supported by the INA190A2IRSWT?
The INA190A2IRSWT supports a common-mode input voltage range of –0.2 V to +40 V, independent of its 1.7–5.5 V supply voltage. This allows direct high-side sensing on 36-V bus rails without level-shifting circuitry. The specification is validated across –40°C to +125°C and applies to both IN+ and IN− pins referenced to GND.
How does the ENABLE pin function on the INA190A2IRSWT?
The ENABLE pin (Pin 7) on the INA190A2IRSWT controls device power state: driving it to VS activates normal operation with 65 µA typical quiescent current, while pulling it to GND disables the amplifier, reducing supply current to ≤100 nA and placing the OUT pin in high-impedance mode. This pin is exclusive to DDF and RSW packages and must be externally driven - not left floating.
Can the INA190A2IRSWT measure bidirectional current, and how is it configured?
Yes, the INA190A2IRSWT supports bidirectional current sensing by applying a reference voltage to the REF pin. When VREF = VS/2, a positive differential input (IN+ > IN−) produces an output > VREF, and a negative differential input produces an output < VREF. This configuration enables single-supply measurement of charge/discharge currents in battery systems without external op-amps or polarity switches.
What is the gain error specification for the INA190A2IRSWT, and how does it affect accuracy?
The INA190A2IRSWT has a gain error of ±0.3% maximum across temperature (–40°C to +125°C). At full-scale output, this translates to ±0.3% uncertainty in calculated current - for example, ±15 mA error at 5 A measured with a 10-mΩ shunt. Combined with ±15 µV offset, total error remains under 0.5% in typical 12-bit ADC systems using proper layout and filtering.
Which package type does the INA190A2IRSWT use, and what are its key mechanical features?
The INA190A2IRSWT uses the RSW package: a 10-pin ultra-thin quad flat no-lead (UQFN) measuring 1.80 mm × 1.40 mm with 0.4-mm pitch and wettable flanks. Its small footprint and exposed thermal pad support high-density PCB layouts and reliable reflow soldering, while the dual GND pins (Pins 2 and 9) enhance thermal dissipation and noise immunity in precision analog circuits.
INA190A2IRSWT 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:
- Rail-to-Rail
- Slew Rate:
- 0.25V/µs
- Gain Bandwidth Product:
- 37 kHz
- -3db Bandwidth:
- 20 kHz
- Current - Input Bias:
- 500 pA
- Voltage - Input Offset:
- 2 µV
- Current - Supply:
- 40µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 1.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-UQFN (1.8x1.4)
INA190A2IRSWT FAQ
1.How can I place an order for INA190A2IRSWT through Aetrix?
Please submit a Request for Quotation (RFQ) for INA190A2IRSWT 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 INA190A2IRSWT reliable?
The price and inventory of INA190A2IRSWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA190A2IRSWT is usually 5 days.
3.What payment methods are accepted for INA190A2IRSWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA190A2IRSWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA190A2IRSWT?
INA190A2IRSWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA190A2IRSWT 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 INA190A2IRSWT?
For technical support, including INA190A2IRSWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA190A2IRSWT requirements.
6.How does Aetrix verify that INA190A2IRSWT is sourced from the original manufacturer or authorized distributors?
All INA190A2IRSWT 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 INA190A2IRSWT meets industry standards.
7.What is the process for return or replacement of INA190A2IRSWT?
All INA190A2IRSWT units undergo pre-shipment inspection (PSI). If there is an issue with INA190A2IRSWT, 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 INA190A2IRSWT part is unused and in its original packaging.
Return procedure for INA190A2IRSWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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