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INA826AIDR

Precision in-amp, G=1-1000, 150μV Vos, 104dB CMRR, 200μA Iq, ±40V prot, SOIC-8

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Manufacturer Part：

INA826AIDR

Package：

SOIC-8 / D (4.9 x 6.0 x 1.58mm)

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Description

Product Overview

The INA826AIDR from Texas Instruments is a precision 200μA instrumentation amplifier with rail-to-rail output in an SOIC-8 package. A single external resistor sets gain from 1 to 1000, with 150μV max offset, 104dB min CMRR at G=10, ±40V input overvoltage protection, and 3V to 36V supply range for industrial sensor signal conditioning.

Key Specifications

Gain Range 1 to 1000 (single external resistor)
Supply Voltage Range 3V to 36V (single) / ±1.5V to ±18V (dual)
Quiescent Current 200μA typ.
Input Offset Voltage 150μV max
Offset Drift 2μV/°C max
Gain Drift 1 ppm/°C (G=1), 35 ppm/°C (G>1) max
Gain Error 0.15% max
Gain Non-Linearity 0.0005% max
CMRR (G=10) 104dB min
CMRR at 5kHz (G=10) 100dB min
PSRR (G=1) 100dB min
Input Bias Current 65nA max
Voltage Noise (1kHz, G≥100) 18nV/√Hz typ.
Bandwidth (G=1) 1MHz
Bandwidth (G=100) 60kHz
Input CM Range Includes V- (up to V+ -1V)
Input Protection ±40V beyond supplies
Output Rail-to-rail
Package SOIC-8 (4.9 x 6.0mm)
Operating Temperature -40°C to +125°C

Features

  • Single resistor gain setting: 1 to 1000
  • Ultra-low 200μA supply current
  • Excellent CMRR: 104dB min at G=10 (DC), 100dB at 5kHz
  • Low offset voltage: 150μV max
  • Low gain drift: 1 ppm/°C at G=1, 35 ppm/°C at G>1
  • Input common-mode range includes negative rail
  • Input overvoltage protection to ±40V
  • Rail-to-rail output for maximum dynamic range
  • 3V to 36V single supply or ±1.5V to ±18V dual supply
  • Low cost instrumentation amplifier solution

Applications

  • Resistive bridge sensor signal conditioning
  • Industrial process control and automation
  • Medical instrumentation (ECG, pressure)
  • Current sensing with shunt resistors
  • Battery monitoring and management

The INA826AIDR from Texas Instruments is a cost-effective precision instrumentation amplifier offering extremely low 200μA power consumption and wide 3V to 36V supply range. A single external resistor sets any gain from 1 to 1000 with excellent gain drift of only 35 ppm/°C max (G>1). The device achieves 104dB min CMRR at G=10 (maintaining 100dB at 5kHz), 150μV max offset voltage, and rail-to-rail output for maximum dynamic range. Input protection circuitry limits input currents to less than 8mA for voltages up to ±40V beyond the supplies, providing robust fault tolerance in industrial environments.

The INA826 uses a current-feedback three-op-amp instrumentation amplifier topology. The input stage employs matched PNP transistors (Q1, Q2) that level-shift the input voltages up by a diode drop, enabling the common-mode range to include the negative supply rail. Internal amplifiers A1 and A2 drive current through the gain-setting resistor RG, and the resulting differential current is mirrored to the output stage A3. The gain equation is G = 1 + (49.4kΩ / RG), where a single external resistor RG sets the gain from 1 (RG open) to 1000 (RG ≈ 49.4Ω). The rail-to-rail output stage maximizes dynamic range at low supply voltages. Input protection uses series resistors and clamping diodes to limit current to 8mA for input voltages up to ±40V beyond the supplies.

Pin Name Type Function
1 RG1 I/O Gain set resistor connection 1
2 VIN- Input Inverting differential input
3 VIN+ Input Non-inverting differential input
4 V- Power Negative supply / Ground
5 REF Input Reference voltage input (output offset)
6 VO Output Amplifier output (rail-to-rail)
7 V+ Power Positive supply (3V to 36V)
8 RG2 I/O Gain set resistor connection 2
  • Wheatstone bridge sensor conditioning (load cell, pressure, strain gauge)
  • Industrial 4-20mA current loop receiver front-end
  • Medical ECG/EEG differential signal acquisition
    • High-side/low-side current sensing with shunt resistors
  • Battery cell voltage monitoring in multi-cell packs
Manufacturer Part Number Package Notes
TI INA826AIDGKR VSSOP-8 Same specs, smaller package
TI INA828AIDR SOIC-8 Lower noise, 350μA Iq
ADI AD8422ARMZ MSOP-8 Low noise in-amp, 330μA
ST TSZ124IPT TSSOP-14 Quad zero-drift in-amp alternative
Maxim MAX4194ESA+ SOIC-8 Variable gain in-amp, 1-1000
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Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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