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Texas Instruments INA190A1IDDFT
- Part No.:
- INA190A1IDDFT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA190A1IDDFT.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,671
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Product details
Overview
INA190A1IDDFT from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 25 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 operates from 1.7 V to 5.5 V supply and draws only 65 µA quiescent current, enabling microamp-level current measurement in battery-powered load monitoring circuits.
For engineers reviewing the INA190A1IDDFT datasheet, INA190A1IDDFT pinout, INA190A1IDDFT application, or INA190A1IDDFT equivalent, this page delivers verified specifications, package-validated pin functions, real-world use cases for high-side/low-side sensing, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The INA190A1IDDFT 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 across shunts at bus voltages up to +40 V - independent of its 1.7–5.5 V supply rail. Its zero-drift design ensures stable offset performance over temperature (80 nV/°C max drift).
This device supports bidirectional operation via external REF pin biasing and features an ENABLE pin (active-high) that places OUT in high-impedance state and reduces supply current to ≤100 nA when disabled - critical for intermittent monitoring in portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 25 V/V - fixed ratio; converts 1 mV sense voltage to 25 mV output, enabling precise low-current detection with minimal signal conditioning. |
| Offset Voltage (max) | ±15 µV - enables accurate sub-millivolt differential measurements, supporting shunt resistors as small as 10 mΩ without significant error at light loads. |
| Common-Mode Range | –0.2 V to +40 V - allows direct high-side sensing on 3.3 V, 5 V, 12 V, or 40 V rails without level-shifting circuitry. |
| Supply Voltage Range | 1.7 V to 5.5 V - compatible with Li-ion, USB, and logic-supply domains; supports operation down to single-cell battery voltage. |
| Quiescent Current (typ) | 48 µA - enables >1-year battery life in periodic current-monitoring applications (e.g., smart charger sleep mode). |
| CMRR (min) | 132 dB - rejects >20 V common-mode transients while preserving µV-level differential signals, essential for noisy power-rail environments. |
| Bandwidth (A1) | 45 kHz - sufficient for DC–10 kHz current profiling in PSU feedback, battery protection, and motor phase monitoring. |
Pinout & Package
INA190A1IDDFT is packaged in an 8-pin SOT-23 (DDF) variant with wettable flanks, measuring 1.60 mm × 2.90 mm. The ENABLE pin is present and functional in this package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection; must be left floating or tied to GND/VS per layout best practice - no electrical function. |
| 2 | ENABLE | Digital enable input; driven to VS for normal operation (65 µA IQ), to GND for shutdown (≤100 nA IQ); output enters high-Z state. |
| 3 | REF | Bidirectional reference bias point; sets zero-current output level (e.g., 2.5 V for ±20 mA full-scale with 100 mΩ shunt). |
| 4 | GND | Analog ground reference; must be connected to system AGND plane with low-impedance path to minimize noise coupling. |
| 5 | OUT | Voltage-output node; provides 25×(IN+ − IN−) + VREF; rail-to-rail swing (GND +1 mV to VS −40 mV) maximizes dynamic range at low supply. |
| 6 | IN− | Negative current-sense input; connects to load side of shunt in high-side config, or ground side in low-side config. |
| 7 | IN+ | Positive current-sense input; connects to bus side of shunt in high-side config, or load side in low-side config. |
| 8 | VS | Single analog supply input; powers internal amplifiers and bias circuitry; requires 0.1 µF local bypass to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 0.5 nA typ - permits use of high-value shunts (e.g., 10 Ω) for µA-range current measurement without loading error. |
| Zero-drift architecture | 80 nV/°C max offset drift - maintains calibration stability across –40°C to +125°C industrial temperature range. |
| Bidirectional sensing capability | Enabled by REF pin - supports charge/discharge monitoring in battery management with single-ended ADC interface. |
| High common-mode rejection | 132 dB min - suppresses bus ripple and switching noise in DC-DC converter outputs and motor drives. |
| Enable-controlled shutdown | ≤100 nA supply current in disabled state - eliminates standby power loss in always-on current-monitoring nodes. |
Applications
| Smartphone Battery Protection | Server PSU Output Monitoring |
|---|---|
Use Scenario: Real-time charge/discharge current tracking during fast charging cycles and deep discharge recovery. IC Role / Device Role / Timing Role: Precision current-sense amplifier converting shunt voltage to scaled analog output for MCU ADC sampling. Use Value: Enables ±0.5% current accuracy over 0–5 A range using 20 mΩ shunt, extending battery cycle life via adaptive charge control. |
Use Scenario: Continuous monitoring of +12 V output rail current in 80 PLUS Titanium PSUs for thermal derating and fault logging. IC Role / Device Role / Timing Role: High-side current sensor interfacing to digital power controller for closed-loop current limiting. Use Value: Withstands 12 V rail transients up to 40 V common-mode, eliminating need for isolated amplifiers or optocouplers. |
| USB-C PD Power Delivery | Industrial PLC Analog Input Module |
Use Scenario: Bidirectional current measurement in USB-C port controllers to enforce source/sink compliance and detect cable faults. IC Role / Device Role / Timing Role: Current-sense front-end with REF-biased output feeding into SAR ADC for real-time protocol arbitration. Use Value: 25 V/V gain and 45 kHz bandwidth support 100 kHz PD negotiation timing while maintaining <1% total error. |
Use Scenario: Low-power, high-accuracy current loop (4–20 mA) transmitter diagnostics in hazardous-area field instruments. IC Role / Device Role / Timing Role: Shunt-based current monitor providing diagnostic feedback to HART modem and safety MCU. Use Value: 1.7 V minimum supply allows operation from 3.3 V isolated rail; 132 dB CMRR rejects 50/60 Hz EMI in factory floor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA210AIDCKR | 20 V/V gain, 100 µA IQ, no ENABLE pin, SC70-6 package - lacks shutdown mode and has lower CMRR (100 dB). | Suitable only for always-on, low-bandwidth (<10 kHz) sensing where power budget permits higher IQ. | Select when board space is constrained (SC70), ENABLE is unnecessary, and ±1% gain error is acceptable. |
| MAX40010FAUT+T | 20 V/V gain, 125 µA IQ, integrated 10-bit ADC, SOT23-6 - adds digitization but removes analog flexibility and REF-based bidirectionality. | Best for systems requiring direct I²C telemetry without external ADC, but not for analog feedback loops. | Choose when digital output simplifies BOM and firmware handles calibration; avoid if analog loop stability or REF biasing is required. |
Compared with INA210AIDCKR and MAX40010FAUT+T, the INA190A1IDDFT uniquely combines ENABLE-driven ultra-low-power shutdown, true bidirectional analog output via REF, and 132 dB CMRR - making it optimal for battery-sensitive, high-noise, or analog-closed-loop applications where alternatives compromise on power, flexibility, or accuracy.
Availability
INA190A1IDDFT is available at Aetrix Electronics and suitable for smartphone battery protection, server PSU output monitoring, USB-C PD power delivery, and industrial PLC analog input modules requiring stable component supply across extended production lifecycles.
Supply support for INA190A1IDDFT 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 chain solutions.
The INA190 product line was designed specifically for high-accuracy, low-power current sensing in space-constrained, battery-operated, and high-voltage industrial systems - emphasizing zero-drift stability, wide common-mode tolerance, and enable-controlled energy efficiency.
FAQ
What is the maximum common-mode voltage the INA190A1IDDFT can handle?
The INA190A1IDDFT 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 12 V, 24 V, or 40 V rails without external level-shifting circuitry. The specification is validated across –40°C to +125°C and applies to both IN+ and IN– pins simultaneously.
Does the INA190A1IDDFT support bidirectional current sensing, and how is it implemented?
Yes, the INA190A1IDDFT supports bidirectional current sensing via its REF pin. When a reference voltage (e.g., 2.5 V) is applied to REF, positive differential input (IN+ > IN−) produces an output above VREF, and negative differential input produces an output below VREF. This enables single-supply MCU ADCs to measure charge and discharge currents using one analog input channel.
What is the purpose of the ENABLE pin on the INA190A1IDDFT, and what happens when it is grounded?
The ENABLE pin on the INA190A1IDDFT controls device activation: driving it to VS enables normal operation (65 µA IQ), while grounding it disables the amplifier, reducing supply current to ≤100 nA and placing the OUT pin in high-impedance state. This feature is essential for duty-cycled current monitoring in battery-powered devices to extend operational lifetime.
Can the INA190A1IDDFT be used with a 1.8-V supply, and what is its output swing capability at that voltage?
Yes, the INA190A1IDDFT operates down to 1.7 V supply. At VS = 1.8 V, its output swings from GND +1 mV to VS –40 mV (i.e., 1.76 V), delivering >97% of the full-scale range. This rail-to-rail performance preserves resolution for low-voltage MCUs and ensures usable headroom even under brownout conditions.
How does the zero-drift architecture of the INA190A1IDDFT improve measurement accuracy over temperature?
The zero-drift architecture of the INA190A1IDDFT limits offset voltage drift to 80 nV/°C max, ensuring total offset remains within ±15 µV across –40°C to +125°C. This stability prevents calibration drift in long-duration measurements (e.g., battery coulomb counting) and enables consistent accuracy without periodic auto-zero routines or software compensation.
INA190A1IDDFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.3V/µs
- Gain Bandwidth Product:
- 45 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 500 pA
- Voltage - Input Offset:
- 3 µV
- Current - Supply:
- 48µA
- 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:
- TSOT-23-8
INA190A1IDDFT FAQ
1.How can I place an order for INA190A1IDDFT through Aetrix?
Please submit a Request for Quotation (RFQ) for INA190A1IDDFT 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 INA190A1IDDFT reliable?
The price and inventory of INA190A1IDDFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA190A1IDDFT is usually 5 days.
3.What payment methods are accepted for INA190A1IDDFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA190A1IDDFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA190A1IDDFT?
INA190A1IDDFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA190A1IDDFT 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 INA190A1IDDFT?
For technical support, including INA190A1IDDFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA190A1IDDFT requirements.
6.How does Aetrix verify that INA190A1IDDFT is sourced from the original manufacturer or authorized distributors?
All INA190A1IDDFT 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 INA190A1IDDFT meets industry standards.
7.What is the process for return or replacement of INA190A1IDDFT?
All INA190A1IDDFT units undergo pre-shipment inspection (PSI). If there is an issue with INA190A1IDDFT, 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 INA190A1IDDFT part is unused and in its original packaging.
Return procedure for INA190A1IDDFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA190A1IDDFT Tags
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