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INA185

ACTIVE

26-V, 350-kHz, bi-directional, high-precision current sense amplifier in ultra-small SOT-563 package

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Data sheet

INA185

ACTIVE
Data sheet Order now

Product details

Product type Analog output Common-mode voltage (max) (V) 26 Common-mode voltage (min) (V) -0.2 Input offset (±) (max) (µV) 55, 135 Input offset drift (±) (typ) (µV/°C) 0.2 Features Bidirectional, High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100, 200, 500 CMRR (min) (dB) 86, 96, 106 Bandwidth (kHz) 60, 105, 150, 210, 350 Iq (max) (mA) 0.3 Number of channels 1 Comparators (#) 0 Gain error (%) 0.12, 0.17 Gain error drift (±) (max) (ppm/°C) 8 Slew rate (V/µs) 2 Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 26 Common-mode voltage (min) (V) -0.2 Input offset (±) (max) (µV) 55, 135 Input offset drift (±) (typ) (µV/°C) 0.2 Features Bidirectional, High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100, 200, 500 CMRR (min) (dB) 86, 96, 106 Bandwidth (kHz) 60, 105, 150, 210, 350 Iq (max) (mA) 0.3 Number of channels 1 Comparators (#) 0 Gain error (%) 0.12, 0.17 Gain error drift (±) (max) (ppm/°C) 8 Slew rate (V/µs) 2 Operating temperature range (°C) -40 to 125
SOT-SC70 (DCK) 6 4.2 mm² (2 mm × 2.1 mm) SOT-5X3 (DRL) 6 2.56 mm² (1.6 mm × 1.6 mm)
  • SC70 and SOT-563 packages
    • SC70 offers compatibility to existing solutions
    • SOT-563 is 39% smaller footprint than SC70
    • SOT-563 dimensions is 1.6 mm × 1.6 mm × 0.55 mm
  • Common-mode range (VCM): –0.2 V to +26 V
  • High bandwidth: 350 kHz (A1 devices)
  • Offset voltage:
    • ±55 µV (maximum) at VCM = 0 V
    • ±100 µV (maximum) at VCM = 12 V (A4 device)
  • Output slew rate: 2 V/µs
  • Bidirectional current-sensing capability
  • Accuracy:
    • Maximum gain error (A1, A2, A3): ±0.2%
    • Maximum offset drift: 0.5 µV/°C
  • Gain options:
    • 20 V/V (A1 devices)
    • 50 V/V (A2 devices)
    • 100 V/V (A3 devices)
    • 200 V/V (A4 devices)
  • Quiescent current: 260 µA (maximum)
  • SC70 and SOT-563 packages
    • SC70 offers compatibility to existing solutions
    • SOT-563 is 39% smaller footprint than SC70
    • SOT-563 dimensions is 1.6 mm × 1.6 mm × 0.55 mm
  • Common-mode range (VCM): –0.2 V to +26 V
  • High bandwidth: 350 kHz (A1 devices)
  • Offset voltage:
    • ±55 µV (maximum) at VCM = 0 V
    • ±100 µV (maximum) at VCM = 12 V (A4 device)
  • Output slew rate: 2 V/µs
  • Bidirectional current-sensing capability
  • Accuracy:
    • Maximum gain error (A1, A2, A3): ±0.2%
    • Maximum offset drift: 0.5 µV/°C
  • Gain options:
    • 20 V/V (A1 devices)
    • 50 V/V (A2 devices)
    • 100 V/V (A3 devices)
    • 200 V/V (A4 devices)
  • Quiescent current: 260 µA (maximum)

The INA185 current sense amplifier is designed for use in cost-sensitive space constrained applications. This device is a bidirectional, current-sense amplifier (also called a current-shunt monitor) that senses the voltage drop across a current-sense resistor at common-mode voltages from –0.2 V to +26 V, independent of the supply voltage. The INA185 integrates a matched resistor gain network in four, fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. This matched gain resistor network minimizes gain error and reduces the temperature drift.

The INA185 operates from a single 2.7-V to 5.5-V power supply. The device draws a maximum supply current of 260 µA and features high slew rate and bandwidth making this device an excellent choice for many power-supply and motor-control applications.

The INA185 is available in an industry standard SC70 package and low profile 6-pin, SOT-563 package. The SOT-563 package has a body size of size of only 2.56 mm2, including the device pins. All device options are specified over the extended operating temperature range of –40°C to +125°C.

The INA185 current sense amplifier is designed for use in cost-sensitive space constrained applications. This device is a bidirectional, current-sense amplifier (also called a current-shunt monitor) that senses the voltage drop across a current-sense resistor at common-mode voltages from –0.2 V to +26 V, independent of the supply voltage. The INA185 integrates a matched resistor gain network in four, fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. This matched gain resistor network minimizes gain error and reduces the temperature drift.

The INA185 operates from a single 2.7-V to 5.5-V power supply. The device draws a maximum supply current of 260 µA and features high slew rate and bandwidth making this device an excellent choice for many power-supply and motor-control applications.

The INA185 is available in an industry standard SC70 package and low profile 6-pin, SOT-563 package. The SOT-563 package has a body size of size of only 2.56 mm2, including the device pins. All device options are specified over the extended operating temperature range of –40°C to +125°C.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet INA185 26-V, 350-kHz, Bidirectional, High-Precision Current Sense Amplifier in Ultra-Small (SOT-563) Package datasheet (Rev. A) PDF | HTML Nov 29, 2023
Application note Using a PCB Copper Trace as a Current Sense Shunt Resistor (Rev. A) PDF | HTML Apr 27, 2026
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML Nov 18, 2024
Circuit design Precision overcurrent latch circuits (Rev. A) PDF | HTML Sep 27, 2024
Circuit design Circuit to measure multiple redundant source currents with singled-ended signal PDF | HTML Jun 28, 2021
Circuit design Adjustable-gain, current-output, high-side current-sensing circuit Aug 9, 2019
Technical article Use fast, precise overcurrent detection to enable diagnostics in automotive safety PDF | HTML Jun 24, 2019
Technical article Minimizing input power protection for smart speakers and smart displays PDF | HTML Jun 24, 2019
Circuit design Fast-response overcurrent event detection circuit May 27, 2019
Application brief Bidirectional, Low-Side Phase Current Sensing With Onboard Overcurrent Detection (Rev. D) Mar 6, 2019
Application brief Precision, Low-Side Current Measurement (Rev. B) Mar 6, 2019

Design & development

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

Evaluation board

INA185EVM — INA185 current sensing evaluation module

The INA185 is a current sense monitor solution that provides ease of use and high performance in a small package.  The INA185EVM is intended to provide basic functional evaluation of the device family. The fixture layout is not intended as a model for the target circuit, nor it is laid out (...)
User guide: PDF
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Simulation model

INA185 TINA-TI Reference Design

SBOMAY3.TSC (376 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

INA185 TINA-TI Spice Model

SBOMAY4.ZIP (37 KB) - TINA-TI Spice model
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Simulation model

INA185A1 PSpice Model

SBOMBA8.ZIP (23 KB) - PSpice model
Supported products & hardware
Simulation model

INA185A2 PSpice Model

SBOMBF1.ZIP (24 KB) - PSpice model
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Simulation model

INA185A3 PSpice Model

SBOMBF0.ZIP (24 KB) - PSpice model
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Simulation model

INA185A4 PSpice Model

SBOMBE9.ZIP (24 KB) - PSpice model
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Simulation model

Precision Over-Current Latch Circuit

SBVM944.ZIP (12 KB) - TINA-TI reference design
Supported products & hardware
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
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
Design tool

CIRCUIT060036 — Adjustable-gain, current-output, high-side current-sensing circuit

This circuit demonstrates how to convert a voltage-output, current sense amplifier (CSA) into a current-output circuit using an operational amplifier (op amp) and a current-setting resistor (RSET). Taking advantage of the matched internal resistor gain network of the current sense amplifier, this (...)
Supported products & hardware
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 (...)
Supported products & hardware
Design tool

CIRCUIT060038 — Fast-response overcurrent event detection circuit

This is a fast-response unidirectional current-sensing solution, generally referred to as overcurrent protection (OCP), that can provide a < 2-μs time response, tresp, overcurrent alert signal to power off a system exceeding a threshold current. In this particular setup, the normal operating (...)
Supported products & hardware
Reference design

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 (...)

Supported products & hardware
Reference design

TIDA-010954 — 600W GaN-based single-phase cycloconverter reference design

This reference design implements a 600W bidirectional single-stage DC-AC inverter based on cycloconverter (AC-DAB) topology and TI GaN power stages. The design supports up to 60V and ±16A on the DC side and on the single-phase, 230VAC and 2.6A. The inverter supports bidirectional power flow and (...)
Supported products & hardware
Reference design

TIDA-011008 — 3.6kW, GaN-based single-phase string inverter reference design

This reference design provides an overview into the implementation of a GaN-based single-phase string inverter. The design consists of one string input, able to handle up to 10 photovoltaic (PV) panels in series. The nominal rated power from string inputs to a single-phase grid connection at 230V (...)

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Package Pins CAD symbols, footprints & 3D models
SOT-SC70 (DCK) 6 Ultra Librarian
SOT-5X3 (DRL) 6 Ultra Librarian
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