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INA333AIDGKR

Zero-drift instrumentation amp, 25μV Vos, 50μA Iq, 1.8-5.5V, VSSOP-8

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Manufacturer Part：

INA333AIDGKR

Package：

VSSOP-8 / DGK-8 (3.0 x 4.9 x 1.15mm)

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Description

Product Overview

The INA333AIDGKR from Texas Instruments is a micro-power (50μA), zero-drift, rail-to-rail output instrumentation amplifier in a VSSOP-8 (DGK) package. With offset voltage of 25μV max, drift of 0.1μV/°C, and gain set by a single external resistor from 1 to 1000, it is ideal for precision measurement in battery-powered and portable applications.

Key Specifications

Input Offset Voltage 25μV max (G≥100)
Offset Drift 0.1μV/°C (G≥100)
Noise Density 50nV/√Hz (G≥100)
CMRR 100dB min (G≥10)
Input Bias Current 200pA max
Supply Voltage 1.8V to 5.5V
Quiescent Current 50μA
Bandwidth 150kHz (G=1)
Gain Range 1 to 1000 (external resistor)
Package VSSOP-8 (3.0 x 4.9mm)
Operating Temperature -40°C to +125°C

Features

  • Zero-drift: 0.1μV/°C offset drift
  • Ultralow offset: 25μV max (G≥100)
  • Low noise: 50nV/√Hz (G≥100)
  • High CMRR: 100dB min (G≥10)
  • Low bias current: 200pA max
  • Rail-to-rail output
  • Single resistor gain setting: G = 1 + (100kΩ/RG)
  • RFI filtered inputs
  • Micro-power: 50μA quiescent current

Applications

  • Bridge amplifier circuits
  • ECG and medical instrumentation
  • Pressure and load cell sensors
  • Thermocouple amplifiers
  • RTD sensor amplifiers

The INA333AIDGKR from Texas Instruments is a low-power, precision instrumentation amplifier offering excellent accuracy with zero-drift technology. It provides very low offset voltage (25μV max at G≥100), excellent offset voltage drift (0.1μV/°C), and high CMRR (100dB at G≥10). Operating from 1.8V to 5.5V with only 50μA quiescent current, it is ideal for battery-operated systems. Gain is set by a single external resistor from 1 to 1000 using the standard equation G = 1 + (100kΩ/RG).

The INA333 uses a three-op-amp instrumentation amplifier topology with auto-calibration (chopper stabilization) to achieve zero-drift performance. The input stage consists of two auto-zeroed amplifiers that continuously correct their own offset, providing ultra-low 25μV offset and 0.1μV/°C drift. The differential input signal is amplified by the gain stage, with gain determined by a single external resistor RG using G = 1 + (100kΩ/RG). The output stage provides rail-to-rail output swing. RFI filtered inputs prevent high-frequency interference from aliasing into the baseband signal.

Pin Name Type Function
1 RG Passive Gain resistor connection
2 VIN- Input Inverting input
3 VIN+ Input Non-inverting input
4 V- Power Negative supply
5 REF Input Reference input (connect to GND)
6 VOUT Output Amplifier output
7 V+ Power Positive supply
8 RG Passive Gain resistor connection
  • Wheatstone bridge amplifiers for strain gauges and load cells
  • ECG and biopotential measurement front-ends
  • Precision pressure sensor signal conditioning
  • Thermocouple cold-junction compensated amplifiers
  • RTD temperature sensor 3-wire/4-wire interfaces
Manufacturer Part Number Package Notes
TI INA333AIDRGR WSON-8 Same die, WSON package
TI INA3221AIRSVR UQFN-16 3-channel, 1.8V instrumentation amp
ADI AD8237ARMZ MSOP-8 Zero-drift, rail-to-rail in-amp
Maxim MAX4238AUT SOT-23-6 Zero-drift op-amp alternative
Microchip MCP6N11-010E/SN SOIC-8 Zero-drift instrumentation amp
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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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