Home Amplifiers Current-sense amplifiers Analog current-sense amplifiers
Home
Amplifiers
Current-sense amplifiers
Analog current-sense amplifiers

INA225-Q1

ACTIVE

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

Order now
Data sheet

INA225-Q1

ACTIVE
Data sheet Order now

Product details

Product type Analog output Common-mode voltage (max) (V) 36 Common-mode voltage (min) (V) 0 Input offset (±) (max) (µV) 150 Input offset drift (±) (typ) (µV/°C) 0.1 Voltage gain (V/V) 25, 50, 100, 200 CMRR (min) (dB) 95 Bandwidth (kHz) 70, 125, 200, 250 Supply voltage (max) (V) 36 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.35 Number of channels 1 Comparators (#) 0 Gain error (%) 0.15, 0.2, 0.3 Gain error drift (±) (max) (ppm/°C) 10 Slew rate (V/µs) 0.4 Features Bi-directional, Low-side Capable, Programmable Gain Rating Automotive TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 36 Common-mode voltage (min) (V) 0 Input offset (±) (max) (µV) 150 Input offset drift (±) (typ) (µV/°C) 0.1 Voltage gain (V/V) 25, 50, 100, 200 CMRR (min) (dB) 95 Bandwidth (kHz) 70, 125, 200, 250 Supply voltage (max) (V) 36 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.35 Number of channels 1 Comparators (#) 0 Gain error (%) 0.15, 0.2, 0.3 Gain error drift (±) (max) (ppm/°C) 10 Slew rate (V/µs) 0.4 Features Bi-directional, Low-side Capable, Programmable Gain Rating Automotive TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 125
VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • 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
  • 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

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.

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.
open-in-new Find other Analog current-sense amplifiers
Download View video with transcript Video

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 9
Type Title Date
* Data sheet INA225-Q1 AEC-Q100, 36-V, Bidirectional Current Sense Amplifier With Four Pin-Selectable Gain Settings datasheet (Rev. A) PDF | HTML 10 Mar 2021
Application note Precision Current Measurements on High-Voltage Power-Supply Rails (Rev. F) PDF | HTML 17 Oct 2022
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 Jan 2022
Selection guide Current Sense Amplifiers (Rev. E) 20 Sep 2021
Application note High-Side Motor Current Monitoring for Over-Current Protection (Rev. B) PDF | HTML 23 Feb 2021
Functional safety information INA225-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. A) PDF | HTML 08 Sep 2020
Application note Precision, Low-Side Current Measurement (Rev. B) 06 Mar 2019
Application note External current sense amps vs integrated onboard amplifiers for current sensing (Rev. B) 19 Feb 2019
EVM User's guide INA225EVM User's Guide 07 Mar 2014

Design & development

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

Evaluation board

INA225EVM — INA225 Evaluation Module for 36-V Programmable-Gain, Current Shunt Monitor

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 (...)

User guide: PDF
Not available on TI.com
Simulation model

INA225 PSpice Model (Rev. A)

SBOM933A.ZIP (508 KB) - PSpice Model
Download
Simulation model

INA225 TINA-TI Reference Design (Rev. A)

SBOM881A.TSC (4254 KB) - TINA-TI Reference Design
Download
Simulation model

INA225 TINA-TI Spice Model (Rev. A)

SBOM882A.ZIP (10 KB) - TINA-TI Spice Model
Download
Calculation tool

CS-AMPLIFIER-ERROR-TOOL — Current sense amplifier comparison and error tool

This Excel calculator provides a comparison between two and five of our standard current sense amplifiers, delivering a chart containing the basic parameters of each device. This calculator also takes system condition inputs from users such as common-mode voltage, supply voltage, shunt resistor (...)
Download
Design tool

CIRCUIT060035 — Bidirectional current sensing with a window comparator circuit

This bidirectional current sensing solution uses a current-sense amplifier and a high-speed dual comparator with a rail-to-rail input common mode range to create over-current (OC) alert signals at the comparator outputs (OUTA and OUTB) if the input current (IG1) rises above 100 A or falls below (...)
View options
Design tool

CIRCUIT060037 — Precision over-current latch circuit

This high-side, current sensing solution uses a current sense amplifier, a comparator with an integrated reference and a P-channel MOSFET to create an over-current latch circuit. When a load current greater than 200 mA is detected, the circuit disconnects the system from its power source. The (...)
View options
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Request
Simulation tool

TINA-TI — SPICE-based analog simulation program

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 (...)
User guide: PDF
View options
Reference designs

TIDA-01445 — Automotive High-Voltage Interlock Reference Design

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 (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00302 — Current Shunt Monitor with Transient Robustness Reference Design

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 (...)

Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00328 — 50 mA-20 A, Single-Supply, Low-Side or High-Side Current Sensing Solution

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 (...)
Design guide: PDF
Schematic: PDF
Package Pins Download
VSSOP (DGK) 8 View options
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos