INA190A1IRSWR - 40V Picoamp Current Sense Amp | TI
MPN: INA190A1IRSWR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.72 | $2.72 |
| 10 | $2.45 | $24.50 |
| 100 | $2.18 | $218.00 |
| 500 | $1.95 | $975.00 |
| 1,000 | $1.76 | $1,760.00 |
INA190A1IRSWR Overview
A current sense amplifier is a specialized difference amplifier that measures the small voltage generated across a shunt resistor and converts it into a ground-referenced output signal. Within the power-management hierarchy, it sits between the shunt and an ADC or comparator, enabling precise current measurement for feedback, protection, and telemetry in systems from battery packs to industrial drives.
Key features of the INA190 family include a very wide input common-mode range (-0.2 V to 40 V) that tolerates inductive kickback and reverse-battery events, ultra-low input bias current in the picoampere range that permits very small shunt resistors, and zero-drift architecture for near-DC accuracy. The INA190A1IRSWR offers an ENABLE pin for power-cycling in battery-powered designs and operates across -40C to +125C.
Technically, the device uses a zero-drift (auto-zeroing) topology that eliminates offset drift over time and temperature, achieving precision far beyond conventional CMOS amplifiers. The low bias current allows shunts in the milliohm range without significant self-heating error, while the wide common-mode range permits high-side, low-side, and bidirectional sensing with a single supply. The voltage-output interface connects directly to ADCs without external conditioning.
Typical applications include overcurrent protection in USB and battery-powered systems, precision current telemetry in notebooks and IoT devices, and closed-loop current feedback in industrial controls, where low shunt losses and accuracy at low supply voltages are essential.
Design consideration: because the part supports a 1.8 V supply domain, verify the output swing and reference pin drive against your ADC input range to avoid clipping near the rails.
This page synthesizes distributor pricing, drop-in alternatives, pinout guidance, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for INA190A1IRSWR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
INA190A2IRSWR
β Drop-Inπ Reference alternative (not in catalog)
INA190A3IRSWR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
INA191A1IRSWR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
INA192A1IRSWR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
INA199B3RSWR
β Drop-Inπ Reference alternative (not in catalog)
INA190A1IRSWR Maximum Ratings & Electrical Characteristics
| Product Type | Current Sense Amplifier (current-shunt monitor) |
| Number of Channels | 1 |
| Input Common-Mode Voltage Range | -0.2 V to +40 V |
| Common-Mode Independence | Independent of supply voltage |
| Supply Voltage (VS) | 1.8 V (low-voltage class) |
| Input Bias Current | Picoampere class |
| Architecture | Zero-drift |
| Sensing Mode | Bidirectional, low-side and high-side |
| Output Type | Voltage output, rail-to-rail |
| Enable Pin | Yes |
| Operating Temperature Range | -40C to +125C |
| Package | 10-UQFN (1.8 mm x 1.4 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (per distributor listing) |
INA190A1IRSWR 10-uqfn (1.8 mm x 1.4 mm) Pin Configuration Guide
Pin configuration for INA190A1IRSWR (10-uqfn (1.8 mm x 1.4 mm) package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for INA190A1IRSWR.
Refer to the datasheet for full pin configuration.
Typical Applications
INA190A1IRSWR is suitable for 6 applications: Overcurrent Protection, Battery-Powered Telemetry, Industrial Current Monitoring, Closed-Loop Current Feedback, Medical and Wearable Devices, Networking and Telecom Power Boards.
Overcurrent Protection
The INA190A1IRSWR fits overcurrent protection duty because its -0.2 V to +40 V common-mode range survives fault transients and inductive kickback that would destroy narrower-input monitors, while its voltage output drives a comparator or MCU ADC threshold directly. Placed across a milliohm-class shunt in series with the protected rail, it produces a ground-referenced signal proportional to load current with negligible insertion loss thanks to picoampere bias current. The ENABLE pin lets the system gate monitoring between measurements, and the zero-drift architecture keeps the trip threshold accurate over temperature, reducing false trips in battery chargers, USB ports, and DC distribution protection circuits.
Recommended
Battery-Powered Telemetry
In notebooks, smartphones, and IoT devices, the INA190A1IRSWR measures pack or rail current for fuel-gauging and health telemetry. Its 1.8 V-class supply matches modern low-voltage digital domains, eliminating an extra regulator, while picoampere input bias current allows very small shunt resistors, cutting shunt power loss and self-heating. The ENABLE pin permits duty-cycled measurement, further conserving energy between sampling windows. The zero-drift topology ensures coulomb-counting accuracy does not degrade with temperature, and the 10-UQFN (1.8 mm x 1.4 mm) package fits inside the tight board geometry of handheld products where larger SC70 or SO-8 monitors cannot be placed.
Recommended
Industrial Current Monitoring
Industrial control panels and motor drives monitor 12 V, 24 V, and up to 40 V rails for load diagnostics and preventive maintenance. The INA190A1IRSWR senses shunt drops at the full rail voltage regardless of its own low supply, simplifying high-side placement directly on the distribution bus. Its -40C to +125C operating range covers factory floor temperature extremes, and zero-drift accuracy keeps low-load readings meaningful for condition monitoring. The ground-referenced voltage output interfaces to standard industrial ADCs or PLC analog inputs without level shifting. Because the package footprint is shared across INA190/191/192 gain variants, one PCB can serve multiple current ranges across a product family.
Recommended
Closed-Loop Current Feedback
Switching power supplies, LED drivers, and servo loops require an accurate current feedback signal inside the control loop. The INA190A1IRSWR provides a voltage-output representation of shunt current with zero-drift DC accuracy, so loop gain and regulation setpoints remain stable over life and temperature. Its common-mode range of -0.2 V to +40 V tolerates the switching node excursions at the shunt, while the low bias current avoids loading precision shunts. The ENABLE pin supports bench bring-up by disabling feedback during debug. Output bandwidth is modest by design, which conveniently filters switching noise; add an external RC to set the loop crossover per TI's typical application guidance.
Recommended
Medical and Wearable Devices
Portable diagnostic and wearable devices demand precision current monitoring at very low supply voltages and minimal board area. The INA190A1IRSWR operates from a 1.8 V-class rail matching ultra-low-power medical electronics, and its picoampere input bias current permits large-value microamp measurement shunts without bias-induced error, improving resolution for monitoring therapy currents or battery drain of sensors. Zero-drift offset keeps readings stable across body-worn temperature swings, and the 10-UQFN 1.8 mm x 1.4 mm package fits wearable PCB constraints. The ENABLE pin supports aggressive power gating in always-on patient monitoring, while -40C to +125C ratings cover sterilization-adjacent storage conditions.
Recommended
Networking and Telecom Power Boards
Line cards, routers, and telecom power distribution boards monitor current on -48 V-derived and intermediate bus rails for telemetry and hot-swap protection. The INA190A1IRSWR senses across shunts with common-mode up to +40 V and 200 mV below ground, absorbing negative transients that occur during hot-plug events, independent of its local 1.8 V-class supply. The ground-referenced output feeds back-plane management MCUs, and zero-drift accuracy supports billing-grade energy accounting. Its bidirectional capability measures both charge and discharge paths with one device and a REF offset. The compact 10-UQFN footprint allows placement directly beside shunts on dense power boards where larger monitors cannot fit.
Recommended
Recommended Products Summary
Engineering reference data for INA190A1IRSWR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA190A2IRSWR | INA190A3IRSWR | INA191A1IRSWR | INA192A1IRSWR | INA199B3RSWR |
|---|---|---|---|---|---|---|
| Package | 10-UQFN (1.8x1.4) | 10-UQFN (1.8x1.4) - same | 10-UQFN (1.8x1.4) - same | 10-UQFN (1.8x1.4) - same | 10-UQFN (1.8x1.4) - same | 10-UQFN class - verify exact package |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Architecture | Zero-drift | Zero-drift | Zero-drift | Zero-drift | Zero-drift | Conventional |
| Input Bias Current | Picoampere class | Picoampere class | Picoampere class | Picoampere class | Picoampere class | Higher (microampere class) |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Relative Cost | Premium precision tier (~$2.72 @ 1 pc as of 2026-09-14) | Similar tier | Similar tier | Similar tier | Similar tier | Lower cost tier |
Key Differentiators
- Picoampere input bias current (vs INA199B3RSWR)
- Zero-drift architecture (vs INA199B3RSWR)
- Enable pin for power gating (vs INA199B3RSWR)
Design Notes
Route the shunt sense traces as a Kelvin pair directly to the INA190A1IRSWR IN+ and IN- pins; any copper shared with the high-current path adds milliohms that become gain error. Keep the 10-UQFN (1.8 mm x 1.4 mm) footprint decoupling capacitor (100 nF ceramic) within 1 mm of the VS pin and connect the exposed pad to a solid ground plane for low-inductance return. Given the tiny 0.35 mm-pitch-class land pattern, follow TI's UQFN QFN layout guidelines for solder-mask defined pads.
The -0.2 V to +40 V common-mode range is independent of supply, but the ENABLE pin and REF pin constraints are supply-referenced; do not drive ENABLE above VS. The A1 gain option produces the smallest output for a given shunt - verify full-scale output against your ADC range with maximum load current before finalizing shunt value, or you may trade headroom for resolution unintentionally. Confirm the exact gain and offset values in the TI INA190 datasheet Electrical Characteristics table, as this page does not restate those numeric values.
Because the zero-drift amplifier is designed for DC and low-frequency accuracy, add an RC low-pass filter (for example a few hundred ohms and 10-100 nF at the output) when feeding a SAR ADC to reject switching-regulator ripple present at the shunt. This is a practical recommendation, not a datasheet figure. Place the filter close to the ADC input and keep the REF pin driven from a low-impedance source or divider buffer for bidirectional measurements.
Compliance Information
RoHS compliance per DigiKey and distributor attribute listings; REACH, halogen-free, and conflict-minerals status should be confirmed on TI's product quality pages.
