AEC-Q100, 36V, bi-directional current sense amplifier w/ four pin-selectable gain settings


Product details


Common mode voltage (Max) (V) 36 Common mode voltage (Min) (V) 0 Input offset (+/-) (Max) (uV) 150 Input offset drift (+/-) (Typ) (uV/C) 0.1 Gain (V/V) 100, 200, 25, 50 Gain error (%) 0.15, 0.2, 0.3 Gain error drift (+/-) (Max) (ppm/°C) 10 CMRR (Min) (dB) 95 Bandwidth (kHz) 250, 200, 125, 70 Supply voltage (Max) (V) 36 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.35 Number of channels (#) 1 Comparators (#) 0 Features Bi-directional, Low-side Capable, Programmable Gain 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

VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other Current sense amplifiers analog output


  • AEC-Q100 qualified:
    • Temperature grade 1: –40 °C to +125 °C
    • HBM ESD classification 2
    • CDM ESD classification C4B
  • Functional Safety-Capable
  • Wide common-mode range: 0 V to 36 V
  • Offset voltage: ±150 µV (maximum, all gains)
  • Offset voltage drift: 0.5 µV/°C (maximum)
  • Gain accuracy, over temperature (maximum):
    • 25 V/V, 50 V/V: ±0.15%
    • 100 V/V: ±0.2%
    • 200 V/V: ±0.3%
    • 10-ppm/°C gain drift
  • Bandwidth: 250 kHz (gain = 25 V/V)
  • Programmable gains:
    • G1 = 25 V/V
    • G2 = 50 V/V
    • G3 = 100 V/V
    • G4 = 200 V/V
  • Quiescent current: 350 µA (maximum)
  • Package: 8-pin VSSOP

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The INA225-Q1 is a voltage-output, current-sense amplifier that senses drops across current-sensing resistors at common-mode voltages that vary from 0 V to 36 V, independent of the supply voltage. The device is a bidirectional, current-shunt monitor that allows an external reference to be used to measure current flowing in both directions across a current-sensing resistor.

Four discrete gain levels are selectable using the two gain-select terminals (GS0 and GS1) to program gains of 25 V/V, 50 V/V, 100 V/V, and 200 V/V. The low-offset, zero-drift architecture and precision gain values enable current-sensing with maximum drops across the shunt as low as 10 mV of full-scale, while maintaining very high accuracy measurements over the entire operating temperature range.

The device operates from a single +2.7-V to +36-V power supply, drawing a maximum of 350 µA of supply current. The device is specified over the extended operating temperature range of –40 °C to +125 °C, and is offered in a VSSOP-8 package.

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Technical documentation

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Type Title Date
* Datasheet INA225-Q1 AEC-Q100, 36-V, Bidirectional Current Sense Amplifier datasheet (Rev. A) Mar. 10, 2021
Application note High-Side Motor Current Monitoring for Over-Current Protection (Rev. B) Feb. 23, 2021
Technical article How current-sense amplifiers monitor satellite health Feb. 08, 2021
Application note Precision Current Measurements on High-Voltage Power-Supply Rails (Rev. D) Dec. 29, 2020
Functional safety information INA225-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. A) Sep. 08, 2020
Application note Precision, Low-Side Current Measurement (Rev. B) Mar. 06, 2019
Application note External current sense amps vs integrated onboard amplifiers for current sensing (Rev. B) Feb. 19, 2019
Technical article A key to accurate system thermal management: monitoring both current flow and temperature Oct. 04, 2018
Selection guide Current Sense Amplifiers (Rev. D) Apr. 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
User guide INA225EVM User's Guide Mar. 07, 2014

Design & development

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

Hardware development

document-generic User guide

The INA225 is a voltage output current-shunt monitor that senses drops across shunts at common-mode voltages from 0V to 36V, independent of the supply voltage. The four gain versions are selectable using the 2 external gain select pins, GS0 and GS1. These pins allow a gain of 25, 50, 100, and 200 to (...)

  •  Jumper selectable Gain (25,50,100,200)
  •  Optional input filter
  •  Allows for the INA225 to be used in both unidirectional and bidirectional applications

Design tools & simulation

SBOM881A.TSC (4254 KB) - TINA-TI Reference Design
SBOM882A.ZIP (10 KB) - TINA-TI Spice Model
SBOM933A.ZIP (508 KB) - PSpice Model
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 (...)
  • 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
  • (...)
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
SBOR020A.ZIP (525 KB)

Reference designs

Automotive High-Voltage Interlock Reference Design
TIDA-01445 — This reference design is a low BOM design that has good coverage of automotive interlock connection diagnosis. In hybrid or electric vehicles (HEV/EVs), battery management systems, traction inverters, DCDC converters, onboard chargers, and other subsystems that operate at high voltages need to have (...)
document-generic Schematic document-generic User guide
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
50 mA-20 A, Single-Supply, Low-Side or High-Side Current Sensing Solution
TIDA-00328 This TI Reference Design implements a low-side or high-side wide dynamic range current sensing solution.  Wide dynamic range is achieved by a unique gain switching method.  Switching gain in hardware allows a faster response time than what can typically be achieved with other (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VSSOP (DGK) 8 View options

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