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Product details

Parameters

Common mode voltage (Max) (V) 36 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) 36 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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Pin-for-pin with same functionality to the compared device.
INA139 ACTIVE 2.7 to 36V, 440kHz Variable gain current sense amplifier The INA139 is functionally equivalent with higher bandwidth
INA168 ACTIVE 2.7 to 60V, 800kHz Variable gain current sense amplifier The INA168 is functionally equivalent supporting up to 60 V

Technical documentation

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Type Title Date
* Data sheet INA1x8 High-Side Measurement Current Shunt Monitor datasheet (Rev. E) Dec. 20, 2017
Technical article Solving the multidecade current-measurement challenge in your 48-V BMS application Jun. 14, 2021
Technical article How current-sense amplifiers monitor satellite health Feb. 08, 2021
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
Technical article System trade-offs for high- and low-side current measurements Jun. 01, 2017
Application note 4Q 2012 Issue Analog Applications Journal Sep. 25, 2012
Application note Harnessing wasted energy in 4- to 20-mA current-loop systems Sep. 25, 2012
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

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

Design tools & simulation

SIMULATION MODEL Download
SBFC024.TSM (3 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SBOC152A.TSC (45 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SBOM140A.ZIP (25 KB) - PSpice 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
SCHEMATIC Download
SGLC001A.ZIP (28 KB)

Reference designs

REFERENCE DESIGNS Download
Quad-Channel, 12-Bit, 50-MSPS ADC Reference Design With Low Noise, Low Distortion, DC and AC Inputs
TIDA-00799 — This reference design demonstrates how to implement a single-ended-to-differential input path, which can be AC-coupled or DC-coupled for an ADC3422. It also explains how to design a high-input impedance, DC-coupled input path. The reference design can be used for applications such as low-power data (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Voltage 12 V – 400 V DC Current Sense Reference Design
TIDA-00332 This Verified Design shows a circuit to measure currents with a common mode of up to 400V using an INA138. This is achieved by creating a simple floating power supply and biasing the INA138 directly from the high voltage source. The 400V in this design is an example. With different components even (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

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

Ordering & quality

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  • Ongoing reliability monitoring

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