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INA168

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2.7 to 60V, 800kHz Variable gain current sense amplifier

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Data sheet

INA168

ACTIVE
Data sheet Order now

Product details

Product type Analog output Common-mode voltage (max) (V) 60 Common-mode voltage (min) (V) 2.7 Input offset (±) (max) (µV) 1000 Input offset drift (±) (typ) (µV/°C) 1 Features Current Output Rating Catalog Voltage gain (V/V) adjustable CMRR (min) (dB) 100 Bandwidth (kHz) 32 Supply voltage (max) (V) 60 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.06 Number of channels 1 Comparators (#) 0 Gain error (%) 2 Gain error drift (±) (max) (ppm/°C) 100 Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 60 Common-mode voltage (min) (V) 2.7 Input offset (±) (max) (µV) 1000 Input offset drift (±) (typ) (µV/°C) 1 Features Current Output Rating Catalog Voltage gain (V/V) adjustable CMRR (min) (dB) 100 Bandwidth (kHz) 32 Supply voltage (max) (V) 60 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.06 Number of channels 1 Comparators (#) 0 Gain error (%) 2 Gain error drift (±) (max) (ppm/°C) 100 Operating temperature range (°C) -40 to 125
SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8
  • Complete Unipolar High-Side Current Measurement Circuit
  • Wide Supply and Common-Mode Range
  • INA138: 2.7 V to 36 V
  • INA168: 2.7 V to 60 V
  • Independent Supply and Input Common-Mode Voltages
  • Single Resistor Gain Set
  • Low Quiescent Current (25 µA Typical)
  • Wide Temperature Range: –40°C to +125°C
  • 5-Pin SOT-23 Package
  • Complete Unipolar High-Side Current Measurement Circuit
  • Wide Supply and Common-Mode Range
  • INA138: 2.7 V to 36 V
  • INA168: 2.7 V to 60 V
  • Independent Supply and Input Common-Mode Voltages
  • Single Resistor Gain Set
  • Low Quiescent Current (25 µA Typical)
  • Wide Temperature Range: –40°C to +125°C
  • 5-Pin SOT-23 Package

The INA138 and INA168 (INA1x8) are high-side, unipolar, current shunt monitors. Wide input common-mode voltage range, low quiescent current, and tiny SOT-23 packaging enable use in a variety of applications.

Input common-mode and power-supply voltages are independent and can range from 2.7 V to 36 V for the INA138 and 2.7 V to 60 V for the INA168. Quiescent current is only 25 µA, which permits connecting the power supply to either side of the current measurement shunt with minimal error.

The device converts a differential input voltage to a current output. This current is converted back to a voltage with an external load resistor that sets any gain from 1 to over 100. Although designed for current shunt measurement, the circuit invites creative applications in measurement and level shifting.

Both the INA138 and INA168 are available in SOT23-5 and are specified for the –40°C to 125°C temperature range.

 

The INA138 and INA168 (INA1x8) are high-side, unipolar, current shunt monitors. Wide input common-mode voltage range, low quiescent current, and tiny SOT-23 packaging enable use in a variety of applications.

Input common-mode and power-supply voltages are independent and can range from 2.7 V to 36 V for the INA138 and 2.7 V to 60 V for the INA168. Quiescent current is only 25 µA, which permits connecting the power supply to either side of the current measurement shunt with minimal error.

The device converts a differential input voltage to a current output. This current is converted back to a voltage with an external load resistor that sets any gain from 1 to over 100. Although designed for current shunt measurement, the circuit invites creative applications in measurement and level shifting.

Both the INA138 and INA168 are available in SOT23-5 and are specified for the –40°C to 125°C temperature range.

 
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet INA1x8 High-Side Measurement Current Shunt Monitor datasheet (Rev. E) PDF | HTML 20 Dec 2017
Application note Using a PCB Copper Trace as a Current Sense Shunt Resistor (Rev. A) PDF | HTML 27 Apr 2026
Circuit design High-voltage, high-side floating current sensing circuit using current output, c (Rev. A) PDF | HTML 26 Sep 2024
E-book An Engineer's Guide to Current Sensing (Rev. B) 12 Apr 2022
Application note Extending the Common-Mode Voltage Range of Current-Output Current Shunt Monitors (Rev. A) PDF | HTML 21 Mar 2022
Application brief Extending Beyond the Max Common-Mode Range of Discrete Current-Sense Amplifiers (Rev. A) PDF | HTML 10 Mar 2022
Application brief Safety and Protection for Discrete Digital Outputs in a PLC System Using Current (Rev. B) PDF | HTML 10 Mar 2022
Application brief Benefits of Intergated Low Inductive Shunt for PWM Applications 17 Jun 2017
Application brief Precision LED Brightness and Color Mixing With Discrete Current Sense Amplifiers 28 Feb 2017
Analog Design Journal Q4 2008 Issue Analog Applications Journal 22 Oct 2008
User guide UCC38C42 30-W Synchronous Buck Converter Reference Design 04 Feb 2003

Design & development

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

Simulation model

INA168 PSpice Model (Rev. A)

SBOC030A.ZIP (55 KB) - PSpice Model
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Simulation model

INA168 TINA-TI Reference Design (Rev. B)

SBOC161B.TSC (81 KB) - TINA-TI Reference Design
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Simulation model

INA168 TINA-TI Spice Model (Rev. A)

SBOM222A.ZIP (3 KB) - TINA-TI Spice Model
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Calculation tool

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)

Supported products & hardware

Supported products & hardware
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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 (...)
Supported products & hardware

Supported products & hardware
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Design tool

CIRCUIT060032 — High-voltage, high-side floating current sensing circuit using current output, current sense amp

This cookbook is intended to demonstrate a method of designing an accurate current sensing solution for systems with high common mode voltages. The principle aspect of this design uses a unidirectional circuit to monitor a system with Vcm = 400V by floating the supplies of the device across a (...)
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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 (...)
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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 (...)
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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 (...)
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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
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