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Analog current-sense amplifiers

INA301

ACTIVE

36V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator

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Data sheet

INA301

ACTIVE
Data sheet Order now

Product details

Product type Analog output with integrated comparator Common-mode voltage (max) (V) 36 Common-mode voltage (min) (V) 0 Input offset (±) (max) (µV) 35, 50, 125 Input offset drift (±) (typ) (µV/°C) 0.1 Features Alert Function, High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100 CMRR (min) (dB) 100 Bandwidth (kHz) 450, 500, 550 Iq (max) (mA) 0.7 Number of channels 1 Comparators (#) 1 Gain error (%) 0.1, 0.15, 0.2 Gain error drift (±) (max) (ppm/°C) 10 Slew rate (V/µs) 4 Operating temperature range (°C) -40 to 125
Product type Analog output with integrated comparator Common-mode voltage (max) (V) 36 Common-mode voltage (min) (V) 0 Input offset (±) (max) (µV) 35, 50, 125 Input offset drift (±) (typ) (µV/°C) 0.1 Features Alert Function, High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100 CMRR (min) (dB) 100 Bandwidth (kHz) 450, 500, 550 Iq (max) (mA) 0.7 Number of channels 1 Comparators (#) 1 Gain error (%) 0.1, 0.15, 0.2 Gain error drift (±) (max) (ppm/°C) 10 Slew rate (V/µs) 4 Operating temperature range (°C) -40 to 125
VSSOP (DGK) 8 14.7 mm² (3 mm × 4.9 mm)
  • Wide Common-Mode Input Range: 0 V to 36 V
  • Dual Output: Amplifier and Comparator Output
  • High Accuracy Amplifier:
    • Offset Voltage: 35 µV (Max)
    • Offset Voltage Drift: 0.5 µV/°C (Max)
    • Gain Error: 0.1% (Max)
    • Gain Error Drift: 10 ppm/°C
  • Available Amplifier Gains:
    • INA301A1: 20 V/V
    • INA301A2: 50 V/V
    • INA301A3: 100 V/V
  • Programmable Alert Threshold Set Through a Single Resistor
  • Total Alert Response Time: 1 µs
  • Open-Drain Output With Latching Mode
  • Package: VSSOP-8
  • Wide Common-Mode Input Range: 0 V to 36 V
  • Dual Output: Amplifier and Comparator Output
  • High Accuracy Amplifier:
    • Offset Voltage: 35 µV (Max)
    • Offset Voltage Drift: 0.5 µV/°C (Max)
    • Gain Error: 0.1% (Max)
    • Gain Error Drift: 10 ppm/°C
  • Available Amplifier Gains:
    • INA301A1: 20 V/V
    • INA301A2: 50 V/V
    • INA301A3: 100 V/V
  • Programmable Alert Threshold Set Through a Single Resistor
  • Total Alert Response Time: 1 µs
  • Open-Drain Output With Latching Mode
  • Package: VSSOP-8

The INA301 includes both a high common-mode, current-sensing amplifier and a high-speed comparator configured to detect overcurrent conditions through measuring the voltage developed across a current-sensing or current-shunt resistor and comparing that voltage to a defined threshold limit. The device features an adjustable limit threshold range that is set using a single external limit-setting resistor. This current-shunt monitor can measure differential voltage signals on common-mode voltages that can vary from 0 V up to 36 V, independent of the supply voltage.

The open-drain alert output can be configured to operate in either a transparent mode where the output status follows the input state or in a latched mode where the alert output is cleared when the latch is reset. The device alert response time is under 1 µs, allowing for quick detection of overcurrent events.

This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 700 µA. The device is specified over the extended operating temperature range (–40°C to +125°C), and is available in an 8-pin VSSOP package.

The INA301 includes both a high common-mode, current-sensing amplifier and a high-speed comparator configured to detect overcurrent conditions through measuring the voltage developed across a current-sensing or current-shunt resistor and comparing that voltage to a defined threshold limit. The device features an adjustable limit threshold range that is set using a single external limit-setting resistor. This current-shunt monitor can measure differential voltage signals on common-mode voltages that can vary from 0 V up to 36 V, independent of the supply voltage.

The open-drain alert output can be configured to operate in either a transparent mode where the output status follows the input state or in a latched mode where the alert output is cleared when the latch is reset. The device alert response time is under 1 µs, allowing for quick detection of overcurrent events.

This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 700 µA. The device is specified over the extended operating temperature range (–40°C to +125°C), and is available in an 8-pin VSSOP package.
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INA302 ACTIVE 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amplifier w/ dual comparators The INA302 has dual integrated comparators
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INA300 ACTIVE 36V current sense comparator The INA300 offers only an ALERT signal
INA381 ACTIVE 26-V, 350-kHz current sense amplifier with integrated over-current comparator The INA381 has similar functionality with lower perfomance at a lower price.

Technical documentation

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* Data sheet INA301 36-V, High-Speed, Zero-Drift, Voltage-Output, Current-Shunt Monitor with High-Speed, Overcurrent Comparator datasheet (Rev. A) PDF | HTML Feb 11, 2016
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
Application brief Current Sensing Applications in Communication Infrastructure Equipment (Rev. C) PDF | HTML Aug 8, 2023
Application brief Integrating the Current Sensing Resistor (Rev. D) PDF | HTML Apr 7, 2023
Technical article 4 key current-sensing design trends that are powering electrification PDF | HTML Feb 21, 2023
Application brief Precision Current Measurements on High-Voltage Power-Supply Rails (Rev. F) PDF | HTML Oct 17, 2022
E-book An Engineer's Guide to Current Sensing (Rev. B) Apr 12, 2022
Application brief Measuring Current To Detect Out-of-Range Conditions (Rev. D) PDF | HTML Mar 10, 2022
Application brief Measuring Current for Handle Multiple Out-of-Range Conditions (Rev. C) PDF | HTML Oct 4, 2021
Application brief Integrating the Current Sensing Signal Path (Rev. B) PDF | HTML Sep 29, 2021
Selection guide Current Sense Amplifiers (Rev. E) Sep 20, 2021
Application brief High-Side Motor Current Monitoring for Over-Current Protection (Rev. B) PDF | HTML Feb 23, 2021
Technical article Use fast, precise overcurrent detection to enable diagnostics in automotive safety PDF | HTML Jun 24, 2019
Application brief Bidirectional, Low-Side Phase Current Sensing With Onboard Overcurrent Detection (Rev. D) Mar 6, 2019
Application brief External current sense amps vs integrated onboard amplifiers for current sensing (Rev. B) Feb 19, 2019
Technical article A key to accurate system thermal management: monitoring both current flow and temp PDF | HTML Oct 4, 2018
Circuit design Overcurrent event detection circuit Jul 31, 2018
Application note Closed-Loop Analysis of Load-Induced Amplifier Stability Issues Using Zout Oct 27, 2017
Application brief Low-Drift, Low-Side Current Measurements for Three-Phase Systems (Rev. B) Sep 5, 2017
White paper Overcurrent protection enables more efficient and reliable systems May 16, 2016

Design & development

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

Evaluation board

INA301EVM — INA301 Evaluation Module

Three different gain devices in the same EVM package, which enables the custome quickly setup and evaluate any or all the devices as desired.

User guide: PDF
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Simulation model

INA301 PSpice Model

SBOMA60.ZIP (71 KB) - PSpice model
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Simulation model

INA301 TINA-TI Reference Design (Rev. A)

SBOM959A.TSC (468 KB) - TINA-TI reference design
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Simulation model

INA301 TINA-TI Spice Model (Rev. A)

SBOM960A.ZIP (22 KB) - TINA-TI Spice model
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Simulation model

INA301A1 PSpice Model

SBOMBH1.ZIP (28 KB) - PSpice model
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Simulation model

INA301A2 PSpice Model

SBOMBF4.ZIP (27 KB) - PSpice model
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Simulation model

INA301A3 PSpice Model

SBOMBH2.ZIP (28 KB) - PSpice 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 (...)

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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 (...)
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Design tool

CIRCUIT060034 — Overcurrent event detection circuit

This is a unidirectional current sensing solution generally referred to as overcurrent protection (OCP) that can provide an overcurrent alert signal to shut off a system for a threshold current and re-engage the system once the output drops below a desired voltage (Vout_release) lower than the (...)
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Reference design

PMP22125 — Battery back-up switch, charger and monitor reference design

A complete battery back-up, charger and monitoring is implemented with this reference design.  It includes switching between a 12/24-Vdc source and 12/24-V lead acid battery, constant current battery charging at 1A typical, battery maintenance float charge and monitoring circuits for the (...)
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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 (...)

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Reference design

TIDA-010065 — High-efficiency, low-emission, isolated DC/DC converter-based analog input module reference design

This reference design is a simplified architecture for generating an isolated power supply for isolated amplifiers for measuring isolated voltages and currents. A fully integrated DC/DC converter with reinforced isolation operating from a 5-V input with configurable 5-V or 5.4-V output (headroom (...)
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