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Parameters

Common mode voltage (Max) (V) 60 Common mode voltage (Min) (V) 2.7 Input offset (+/-) (Max) (uV) 1000 Input offset drift (+/-) (Typ) (uV/C) 1 Gain (V/V) Adjustable Gain error (%) 2 Gain error drift (+/-) (Max) (ppm/°C) 100 CMRR (Min) (dB) 100 Bandwidth (kHz) 800 Supply voltage (Max) (V) 60 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.06 Number of channels (#) 1 Comparators (#) 0 Features Current Output Rating Catalog 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

  • 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

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Description

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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Same functionality and pinout but is not an equivalent to the compared device:
INA138 ACTIVE 2.7 to 36V, 800kHz Variable gain current sense amplifier The INA138 is functionally equivalent supporting up to 36 V
INA169 ACTIVE 2.7 to 60V, 440kHz Variable gain current sense amplifier The INA169 is functionally equivalent with higher bandwidth

Technical documentation

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Type Title Date
* Datasheet INA1x8 High-Side Measurement Current Shunt Monitor datasheet (Rev. E) Dec. 20, 2017
Technical article How current-sense amplifiers monitor satellite health Feb. 08, 2021
Application note Current Sensing in a Programmable Logic Controller (PLC) (Rev. A) Dec. 04, 2020
E-book Simplifying Current Sensing (Rev. A) Jan. 09, 2020
Technical article A key to accurate system thermal management: monitoring both current flow and temperature Oct. 04, 2018
Application note High-voltage, high-side floating current sensing circuit using current output, c Jun. 28, 2018
Application note Extending Common-Mode Range of Current-Sense Amplifiers Jul. 06, 2017
Application note Benefits of Intergated Low Inductive Shunt for PWM Applications Jun. 17, 2017
Technical article System trade-offs for high- and low-side current measurements Jun. 01, 2017
Application note Precision LED Brightness and Color Mixing With Discrete Current Sense Amplifiers Feb. 28, 2017
Technical article Why should you care about overcurrent protection in your system? Jun. 16, 2016
Application note A dual-polarity, bidirectional current-shunt monitor Oct. 22, 2008
Application note Q4 2008 Issue Analog Applications Journal Oct. 22, 2008
Application note Extending Voltage Range of Current Shunt Monitor Feb. 15, 2006
User guide UCC38C42 30-W Synchronous Buck Converter Reference Design Feb. 04, 2003

Design & development

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Design tools & simulation

SIMULATION MODEL Download
SBOC030A.ZIP (55 KB) - PSpice Model
SIMULATION MODEL Download
SBOC161B.TSC (81 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SBOM222A.ZIP (3 KB) - TINA-TI Spice Model
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

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

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