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Parameters

Common mode voltage (Max) (V) 110 Common mode voltage (Min) (V) -4 Input offset (+/-) (Max) (uV) 150 Input offset drift (+/-) (Typ) (uV/C) 0.07 Gain (V/V) 100, 20, 200, 50, 500 Gain error (%) 0.5 Gain error drift (+/-) (Max) (ppm/°C) 20 CMRR (Min) (dB) 120 Bandwidth (kHz) 1300 Supply voltage (Max) (V) 20 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 2.25 Number of channels (#) 1 Comparators (#) 0 Features High precision, Low-side Capable Rating Automotive TI functional safety category Functional Safety-Capable Operating temperature range (C) -40 to 125 open-in-new Find other Current sense amplifiers analog output

Package | Pins | Size

SOT-23 (DBV) 5 5 mm² 2.9 x 1.6 open-in-new Find other Current sense amplifiers analog output

Features

  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40 °C to +125 °C, TA
  • Functional Safety-Capable
  • Wide common-mode voltage:
    • Operational voltage: −4 V to +110 V
    • Survival voltage: −20 V to +120 V
  • Excellent CMRR:
    • 120-dB DC CMRR
    • 65-dB AC CMRR at 50 kHz
  • Accuracy:
    • Gain:
      • Gain error: ±0.5% (maximum)
      • Gain drift: ±20 ppm/°C (maximum)
    • Offset:
      • Offset voltage: ±55 µV (typical)
      • Offset drift: ±0.1 µV/°C (typical)
  • Available gains:
    • INA281A1-Q1, INA281B1-Q1 : 20 V/V
    • INA281A2-Q1, INA281B2-Q1 : 50 V/V
    • INA281A3-Q1, INA281B3-Q1 : 100 V/V
    • INA281A4-Q1, INA281B4-Q1 : 200 V/V
    • INA281A5-Q1, INA281B5-Q1 : 500 V/V
  • High bandwidth: 1.3 MHz
  • Slew rate: 2.5V/µs
  • Quiescent current: 1.5 mA

All trademarks are the property of their respective owners.

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Description

The INA281-Q1 is a high-precision current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from –4 V to 110 V. The negative common-mode voltage allows the device to operate below ground, thus accommodating precise measurement of recirculating currents in half-bridge applications. The combination of a low offset voltage, small gain error and high DC CMRR enables highly accurate current measurement. The INA281-Q1 is not only designed for DC current measurement, but also for high-speed applications (like fast overcurrent protection, for example) with a high bandwidth of 1.3 MHz and an 65-dB AC CMRR (at 50 kHz).

The INA281-Q1 operates from a single 2.7-V to 20-V supply, drawing 1.5 mA of supply current. The INA281-Q1 is available with five gain options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. These gain options address wide dynamic range for current-sensing applications.

The INA281-Q1 is specified over an operating temperature range of −40 °C to +125 °C and is offered in a space-saving SOT-23 package with two pin-out variants.

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Same functionality and pinout but is not an equivalent to the compared device:
NEW INA293-Q1 ACTIVE Automotive AEC-Q100, -4-V to 110-V, 1.3-MHz, ultra-precise current sense amplifier Functionally identical with increased accuracy

Technical documentation

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Type Title Date
* Data sheet INA281-Q1 AEC-Q100, –4-V to 110-V, 1.3-MHz Current-Sense Amplifier datasheet Nov. 05, 2020
Technical article How current-sense amplifiers monitor satellite health Feb. 08, 2021
Application note Current Sensing in an H-Bridge (Rev. B) Feb. 05, 2021
Application note High-Side Drive, High-Side Solenoid Monitor With PWM Rejection (Rev. C) Dec. 04, 2020
Functional safety information INA293-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. A) Nov. 05, 2020
Technical article A key to accurate system thermal management: monitoring both current flow and temperature Oct. 04, 2018
Technical article System trade-offs for high- and low-side current measurements Jun. 01, 2017
Technical article Why should you care about overcurrent protection in your system? Jun. 16, 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
document-generic User guide
25
Description
This is a small module with 10 completely independent boards that can be broken off by the user. Ten schematically identical boards for each of the five gain variation and two pinout variations of the INA281 with inputs up to 110V common mode and 5A (on board shunt) input capability. Each board (...)
Features
  • Easy to test INA281 with differential voltage or shunt resistor.
  • Pads and sockets allow quick and easy implementation of SMD filtering.
  • Breakable panels lets customer experiment and test with all gain variants and two pin outs.

Design tools & simulation

SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOL Download
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide
CALCULATION TOOL Download
SBOR020A.ZIP (525 KB)

Reference designs

REFERENCE DESIGNS Download
Current Shunt Monitor with Transient Robustness Reference Design
TIDA-00302 This high-side current shunt monitor is used to measure the voltage developed across a current-sensing resistor when current passes through it.

Additionally, an external protection circuit is implemented to provide surge and fast-transient protection and demonstrate the different immunity levels to (...)

document-generic Schematic document-generic User guide
Design files

CAD/CAE symbols

Package Pins Download
SOT-23 (DBV) 5 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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