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Texas Instruments INA190A3IDDFT
- Part No.:
- INA190A3IDDFT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA190A3IDDFT.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,137
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Product details
Overview
INA190A3IDDFT from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 100 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 INA190A3IDDFT datasheet, INA190A3IDDFT pinout, INA190A3IDDFT application, or INA190A3IDDFT equivalent, this page delivers verified specifications, package-validated pin functions, real-world use cases in high-side/low-side sensing, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The INA190A3IDDFT uses a capacitively coupled front-end architecture to achieve ultra-low input bias current (0.5 nA typ) and reject DC common-mode voltage shifts-enabling stable operation at VCM = –0.2 V to +40 V independent of VS. Its zero-drift core ensures <80 nV/°C offset drift and supports bidirectional sensing via externally applied REF voltage.
In normal operation, the device delivers rail-to-rail output swing (GND + 1 mV to VS – 40 mV), 35 kHz bandwidth at 100 V/V gain, and 0.3 V/µs slew rate. The ENABLE pin (present only in DDF and RSW packages) places OUT in high-impedance state and reduces supply current to ≤100 nA when driven low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100 V/V fixed-converts 10 mV sense voltage to 1 V output, enabling precise low-current detection with minimal shunt power loss. |
| Offset Voltage | ±15 µV max-ensures <0.15% error at 10 mV full-scale input, critical for sub-100 mA measurements with 100 mΩ shunts. |
| Common-Mode Range | –0.2 V to +40 V-supports direct high-side sensing on 36-V bus rails without level-shifting, even when powered from 1.8 V. |
| Input Bias Current | 0.5 nA typ-permits use of ≥1 kΩ RC filters at IN+/IN− without gain/offset degradation, improving noise immunity in noisy PSU environments. |
| Quiescent Current | 65 µA typ enabled / ≤100 nA disabled-extends battery life in periodic-monitoring applications like smartphone charge management. |
| CMRR | 132 dB min-rejects >20 V common-mode transients (e.g., motor commutation spikes) while preserving µV-level differential signal integrity. |
| Bandwidth | 35 kHz at 100 V/V-adequate for DC–10 kHz current waveforms in server PSU overcurrent protection and BBU thermal regulation. |
Pinout & Package
The INA190A3IDDFT is packaged in an 8-pin thin SOT-23 (DDF) with 1.60 mm × 2.90 mm body size and exposed thermal pad. Pin 1 is marked by dot; pin numbering follows standard SOT-23 counterclockwise from mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VS | Analog power supply input-accepts 1.7 V to 5.5 V; powers internal amplifiers and bias circuitry. |
| 2 | ENABLE | Digital enable control-driving low disables amplifier, forces OUT high-Z, and reduces IQ to ≤100 nA. |
| 3 | REF | Bidirectional reference input-applying VS/2 enables symmetric ±ILOAD sensing; output = 100×(VIN+−VIN−) + VREF. |
| 4 | GND | Analog ground reference-must be connected to system ground plane; serves as return path for all internal currents. |
| 5 | OUT | Voltage-output terminal-delivers amplified, referenced current-sense signal; drives 10 kΩ loads with rail-to-rail swing. |
| 6 | IN− | Negative current-sense input-connect to load side of shunt in high-side config or ground side in low-side config. |
| 7 | IN+ | Positive current-sense input-connect to bus side of shunt in high-side config or load side in low-side config. |
| 8 | NC | No-connect-internally unconnected; must be left floating or tied to GND/VS per layout best practices. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | 80 nV/°C max offset drift-maintains calibration stability across –40°C to +125°C industrial temperature range without recalibration. |
| Capacitively coupled input | 132 dB min CMRR-blocks DC common-mode voltage shifts, enabling accurate sensing on 40 V rails with 1.8 V supply. |
| Bidirectional sensing | Voltage-referenced output-using external REF allows single-supply systems to measure both charge and discharge currents in battery packs. |
| Low-power enable mode | ≤100 nA shutdown current-reduces average system power in duty-cycled monitoring (e.g., every 100 ms) by >99.8% vs active mode. |
| Rail-to-rail output | GND + 1 mV to VS – 40 mV swing-maximizes dynamic range on 1.8 V supplies, delivering 1.7 V output span for 17 mV full-scale sense voltage. |
Applications
| Server Power Supply Monitoring | Smartphone Battery Charge Control |
|---|---|
|
Use Scenario: Real-time current monitoring of +12 V and +48 V output rails in merchant server PSUs to detect overcurrent faults before MOSFET failure. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level shunt voltage to clean analog output for ADC sampling and digital fault logic. Use Value: 132 dB CMRR rejects switching noise from synchronous rectifiers; 100 V/V gain provides 1 V output per 10 mV sense drop, matching 12-bit ADC input range. |
Use Scenario: Bidirectional current tracking during Li-ion battery charging/discharging cycles in smartphones to calculate state-of-charge and prevent overvoltage. IC Role / Device Role / Timing Role: Precision current-sense amplifier with REF-biased output feeding microcontroller ADC for Coulomb counting. Use Value: ±15 µV offset enables <1 mA accuracy with 100 mΩ shunt; 0.5 nA input bias prevents measurement drift from PCB leakage paths. |
| Baseband Unit Thermal Management | Consumer Battery Charger Safety |
|
Use Scenario: Continuous load current measurement in 5G baseband units to trigger thermal throttling when power dissipation exceeds cooling capacity. IC Role / Device Role / Timing Role: Low-quiescent-current current-sense amplifier providing analog feedback to FPGA-based thermal control loop. Use Value: 65 µA IQ minimizes self-heating in densely packed BBU modules; 35 kHz bandwidth captures transient current surges during RF burst transmission. |
Use Scenario: Overcurrent protection in USB-C PD chargers that must shut down within 10 µs when cable/connector faults cause >5 A surge. IC Role / Device Role / Timing Role: Fast-response current-sense amplifier driving comparator input for hardware-level OCP latch. Use Value: 30 µs settling time ensures reliable trip within safety-critical timing window; 40 V common-mode range handles 20 V adapter transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA210A3IDCKR | Same 100 V/V gain, but SC70-6 package lacks ENABLE pin; 125 dB CMRR (vs 132 dB); 200 nA input bias (vs 0.5 nA). | Not suitable for power-gated systems requiring shutdown; higher bias current limits use with large RC filters or ultra-low-current (<10 µA) sensing. | Select when board space is constrained (2.00 mm × 1.25 mm SC70) and ENABLE functionality is unnecessary. |
| MAX4008AUA+T | 100 V/V gain, –0.1 V to +36 V common-mode, 1 µA input bias, no ENABLE pin; 120 dB CMRR; 500 kHz bandwidth. | Higher bandwidth suits fast-switching applications, but lower CMRR and missing ENABLE limit use in noisy, battery-sensitive designs. | Select when measuring rapidly changing currents (e.g., motor phase currents) and 36 V max VCM is sufficient. |
Compared with INA210A3IDCKR and MAX4008AUA+T, the INA190A3IDDFT uniquely combines ENABLE functionality, 0.5 nA input bias, and 132 dB CMRR in an 8-pin SOT-23-making it optimal for space-constrained, ultra-low-power, high-noise industrial and portable applications requiring bidirectional sensing.
Availability
INA190A3IDDFT is available at Aetrix Electronics and suitable for server power supply monitoring, smartphone battery charge control, baseband unit thermal management, and consumer battery charger safety requiring stable component supply across automotive-grade temperature ranges and long production lifecycles.
Supply support for INA190A3IDDFT 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 space- and energy-constrained applications-from portable electronics to industrial power systems-leveraging zero-drift and capacitive-coupling innovations.
FAQ
What is the maximum common-mode voltage the INA190A3IDDFT can handle?
The INA190A3IDDFT supports a common-mode input voltage range of –0.2 V to +40 V, independent of its 1.7 V to 5.5 V supply voltage. This allows direct high-side sensing on 36-V bus rails without external level-shifting circuitry, and the device maintains specified accuracy across the full range per its Electrical Characteristics table.
Does the INA190A3IDDFT support bidirectional current sensing, and how is it implemented?
Yes, the INA190A3IDDFT supports bidirectional current sensing via its REF pin. Applying a reference voltage (e.g., VS/2) to REF centers the output voltage; positive differential input (IN+ > IN−) raises OUT above REF, while negative differential input lowers OUT below REF. This enables single-supply systems to distinguish charge vs. discharge currents in battery applications.
What is the purpose of the ENABLE pin on the INA190A3IDDFT, and how does it affect power consumption?
The ENABLE pin on the INA190A3IDDFT (available only in DDF and RSW packages) controls device activation. When driven to VS, the amplifier operates normally with 65 µA typical quiescent current. When driven to GND, the device enters shutdown mode with ≤100 nA supply current and places the OUT pin in high-impedance state-critical for ultra-low-power periodic monitoring.
How does the INA190A3IDDFT achieve ultra-low input bias current, and why is it important?
The INA190A3IDDFT uses a capacitively coupled front-end amplifier to achieve 0.5 nA typical input bias current. This enables use of larger RC input filters without degrading accuracy, supports microamp-level current measurement with high-value sense resistors, and minimizes errors from PCB surface leakage-especially vital in humid or high-impedance sensor interfaces.
What are the key accuracy specifications of the INA190A3IDDFT at 25°C?
At 25°C, the INA190A3IDDFT guarantees ±15 µV maximum offset voltage, ±0.3% maximum gain error (for A3 variant), 7 ppm/°C max gain drift, and 132 dB minimum common-mode rejection ratio. These specs ensure <0.1% total error in typical 10–100 mV sense voltage applications, validated across production lots per TI's SBOS863D datasheet.
INA190A3IDDFT 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:
- 35 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
INA190A3IDDFT FAQ
1.How can I place an order for INA190A3IDDFT through Aetrix?
Please submit a Request for Quotation (RFQ) for INA190A3IDDFT 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 INA190A3IDDFT reliable?
The price and inventory of INA190A3IDDFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA190A3IDDFT is usually 5 days.
3.What payment methods are accepted for INA190A3IDDFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA190A3IDDFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA190A3IDDFT?
INA190A3IDDFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA190A3IDDFT 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 INA190A3IDDFT?
For technical support, including INA190A3IDDFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA190A3IDDFT requirements.
6.How does Aetrix verify that INA190A3IDDFT is sourced from the original manufacturer or authorized distributors?
All INA190A3IDDFT 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 INA190A3IDDFT meets industry standards.
7.What is the process for return or replacement of INA190A3IDDFT?
All INA190A3IDDFT units undergo pre-shipment inspection (PSI). If there is an issue with INA190A3IDDFT, 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 INA190A3IDDFT part is unused and in its original packaging.
Return procedure for INA190A3IDDFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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