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INA351

ACTIVE

Tiny (1.5-mm × 2-mm) low-power (110 µA) instrumentation amplifier with integrated reference buffer

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Data sheet

INA351

ACTIVE
Data sheet Order now

Product details

Number of channels 1 Vs (max) (V) 5.5 Vs (min) (V) 1.8 Input offset (±) (max) (µV) 1300 Voltage gain (min) (V/V) 10 Voltage gain (max) (V/V) 50 Noise at 1 kHz (typ) (nV√Hz) 36 Features Cost Optimized, Low power, Shutdown, Small Size CMRR (min) (dB) 86 Iq (typ) (mA) 0.11 Bandwidth at min gain (typ) (MHz) 0.1 Gain error (±) (max) (%) 0.1 Operating temperature range (°C) -40 to 125 Rating Catalog Output swing headroom (to negative supply) (typ) (V) 0.015 Output swing headroom (to positive supply) (typ) (V) 0.015 Input common mode headroom (to negative supply) (typ) (V) 0 Input common mode headroom (to positive supply) (typ) (V) 0 Noise at 0.1 Hz to 10 Hz (typ) (µVPP) 3.2
Number of channels 1 Vs (max) (V) 5.5 Vs (min) (V) 1.8 Input offset (±) (max) (µV) 1300 Voltage gain (min) (V/V) 10 Voltage gain (max) (V/V) 50 Noise at 1 kHz (typ) (nV√Hz) 36 Features Cost Optimized, Low power, Shutdown, Small Size CMRR (min) (dB) 86 Iq (typ) (mA) 0.11 Bandwidth at min gain (typ) (MHz) 0.1 Gain error (±) (max) (%) 0.1 Operating temperature range (°C) -40 to 125 Rating Catalog Output swing headroom (to negative supply) (typ) (V) 0.015 Output swing headroom (to positive supply) (typ) (V) 0.015 Input common mode headroom (to negative supply) (typ) (V) 0 Input common mode headroom (to positive supply) (typ) (V) 0 Noise at 0.1 Hz to 10 Hz (typ) (µVPP) 3.2
SOT-23-THN (DDF) 8 8.12 mm² 2.9 x 2.8 WSON (DSG) 8 4 mm² 2 x 2 X2QFN (RUG) 10 3 mm² 1.5 x 2
  • Designed for size, cost, and power conscious applications
  • Selectable gain options with integrated reference buffer
    • G = 10 or G = 20 (INA351ABS)
    • G = 30 or G = 50 (INA351CDS)
  • Space saving ultra-small package options
    • 10-pin X2QFN (RUG) – 3mm2
    • 8-pin WSON (DSG) – 4mm2
    • 8-pin SOT23-THN (DDF) – 4.64mm2
  • Optimized performance for 10-bit to 14-bit systems
    • CMRR: 95dB (typical) across all gains
    • Offset voltage: 0.2mV (typical) across all gains
    • Gain error (typical):
      • 0.015% for G = 10, G = 50
      • 0.020% for G = 20, G = 30
  • Bandwidth: 100kHz for G = 10 (typical)
  • Drives 500pF with less than 20% overshoot (typical)
  • Optimized quiescent current: 110µA (typical)
  • Shutdown option for power conscious applications
  • Supply range: 1.8V (±0.9V) to 5.5V (±2.75V)
  • Specified temperature range: –40°C to 125°C
  • Designed for size, cost, and power conscious applications
  • Selectable gain options with integrated reference buffer
    • G = 10 or G = 20 (INA351ABS)
    • G = 30 or G = 50 (INA351CDS)
  • Space saving ultra-small package options
    • 10-pin X2QFN (RUG) – 3mm2
    • 8-pin WSON (DSG) – 4mm2
    • 8-pin SOT23-THN (DDF) – 4.64mm2
  • Optimized performance for 10-bit to 14-bit systems
    • CMRR: 95dB (typical) across all gains
    • Offset voltage: 0.2mV (typical) across all gains
    • Gain error (typical):
      • 0.015% for G = 10, G = 50
      • 0.020% for G = 20, G = 30
  • Bandwidth: 100kHz for G = 10 (typical)
  • Drives 500pF with less than 20% overshoot (typical)
  • Optimized quiescent current: 110µA (typical)
  • Shutdown option for power conscious applications
  • Supply range: 1.8V (±0.9V) to 5.5V (±2.75V)
  • Specified temperature range: –40°C to 125°C

The INA351 is a selectable-gain instrumentation amplifier with integrated reference buffer that offers four gain options across the INA351ABS and INA351CDS variants available in small packages. The INA351ABS has gain options of 10 or 20 and the INA351CDS has gain options of 30 or 50. These gain options can be selected by toggling the gain select (GS) pin. The INA351 is an excellent choice for bridge-type sensing and for differential to single-ended conversion applications.

Built with precision matched integrated resistors, the INA351 saves on BOM costs, pick-and-place machine handling costs, and board space by removing the need for precise or closely-matched external resistors. The INA351 can interface directly to low-speed, 10-bit to 14-bit, analog-to-digital converters (ADCs) and is an excellent choice for replacing discrete implementation of instrumentation amplifiers built with commodity amplifiers and discrete resistors.

Designed with the three-amplifier architecture, the INA351 is optimized for delivering performance. The device achieves 86dB of minimum CMRR and an accurate 0.1% of maximum gain error, along with 1.3mV of maximum offset across all gain options, while consuming just 135µA of maximum quiescent current. The INA351 has an integrated shutdown option to turn off the amplifier when idle for additional power savings in battery-powered applications.

The INA351 is a selectable-gain instrumentation amplifier with integrated reference buffer that offers four gain options across the INA351ABS and INA351CDS variants available in small packages. The INA351ABS has gain options of 10 or 20 and the INA351CDS has gain options of 30 or 50. These gain options can be selected by toggling the gain select (GS) pin. The INA351 is an excellent choice for bridge-type sensing and for differential to single-ended conversion applications.

Built with precision matched integrated resistors, the INA351 saves on BOM costs, pick-and-place machine handling costs, and board space by removing the need for precise or closely-matched external resistors. The INA351 can interface directly to low-speed, 10-bit to 14-bit, analog-to-digital converters (ADCs) and is an excellent choice for replacing discrete implementation of instrumentation amplifiers built with commodity amplifiers and discrete resistors.

Designed with the three-amplifier architecture, the INA351 is optimized for delivering performance. The device achieves 86dB of minimum CMRR and an accurate 0.1% of maximum gain error, along with 1.3mV of maximum offset across all gain options, while consuming just 135µA of maximum quiescent current. The INA351 has an integrated shutdown option to turn off the amplifier when idle for additional power savings in battery-powered applications.
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* Data sheet INA351 Cost and Size Optimized, Low Power, 1.8V to 5.5V Selectable Gain Instrumentation Amplifier with Integrated Reference Buffer datasheet (Rev. D) PDF | HTML 19 Nov 2024
Product overview Small-Size INA35x Versus Discrete Instrumentation Amps (Rev. A) PDF | HTML 31 Jan 2023
Product overview Bridge Sensor Solution (Rev. A) PDF | HTML 27 Jan 2023

Design & development

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Evaluation board

INA-DDF-EVM — Evaluation module for instrumentation amplifiers in DDF package

The INA-DDF-EVM is an evaluation module (EVM) that is compatible with a variety of instrumentation amplifiers (IAs) in the DDF package. It is designed to evaluate the performance of the devices in both single- and dual-supply configurations.
User guide: PDF | HTML
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Evaluation board

SMALL-AMP-DIP-EVM — Evaluation module for operational amplifiers with small-size packages

The SMALL-AMP-DIP-EVM speeds up small-package operational-amplifier prototyping by providing a fast and easy way to interface with many industry-standard small-size packages. SMALL-AMP-DIP-EVM supports eight small package options including DPW-5 (X2SON), DSG-8 (WSON), DCN-8 (SOT), DDF-8 (...)

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Simulation model

INA351_G10 PSpice Model

SBOMCD0.ZIP (41 KB) - PSpice Model
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Simulation model

INA351_G10 TINA-TI Reference Design

SBOMCD4.TSC (51 KB) - TINA-TI Reference Design
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INA351_G10 TINA-TI Spice Model

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Simulation model

INA351_G20 PSpice Model

SBOMCD1.ZIP (48 KB) - PSpice Model
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INA351_G20 TINA-TI Reference Design

SBOMCD5.TSC (51 KB) - TINA-TI Reference Design
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Simulation model

INA351_G20 TINA-TI Spice Model

SBOMCD3.ZIP (5 KB) - TINA-TI Spice Model
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Simulation model

INA351_G30 PSpice Model

SBOMCC4.ZIP (59 KB) - PSpice Model
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Simulation model

INA351_G30 TINA-TI Reference Design

SBOMCC8.TSC (51 KB) - TINA-TI Reference Design
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INA351_G30 TINA-TI Spice Model

SBOMCC6.ZIP (5 KB) - TINA-TI Spice Model
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Simulation model

INA351_G50 PSpice Model

SBOMCC5.ZIP (47 KB) - PSpice Model
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Simulation model

INA351_G50 TINA-TI Reference Design

SBOMCC9.TSC (51 KB) - TINA-TI Reference Design
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Simulation model

INA351_G50 TINA-TI Spice Model

SBOMCC7.ZIP (5 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 (...)

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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 (...)
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SOT-23-THN (DDF) 8 Ultra Librarian
WSON (DSG) 8 Ultra Librarian
X2QFN (RUG) 10 Ultra Librarian
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