Diodes Incorporated

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1.8v, Micropower CMOS Zero-Drift Operational Amplifiers

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The AS333 is a high precision operational amplifier designed with chopping stabilization technique which eliminates 1/f noise, and the cross over distortion presented in most RRIO amplifiers.

The AS333, RRIO amplifier (rail-to-rail input and output), provides not only maximum output voltage swing capability but also an extended 100mV common-mode voltage beyond the supply rail. The device is fully specified to operate from 1.8V to 5.5V single supply, or ±0.9V and ±2.5V dual supply applications.

The device features a good speed/power consumption ratio, offering 350kHz gain bandwidth while consuming only 17μA quiescent current. With the low input offset voltage 8μV and zero-drift offset voltage 0.02μV/°C, it is ideal for applications that require precision, especially for low power and high precision ones.

The AS333 is available in SOT25 and SOT353 packages, and is specified for operation from -40°C to +125°C among all supply voltages. The wide temperature ranges and high ESD tolerance facilitate their use in harsh applications.


  • Low Input Offset Voltage: 8μV (typ)
  • Zero Drift: 0.02μV/°C (typ)
  • 01Hz to 10Hz Noise: 1.1μVPP
  • Low Quiescent Current: 17μA (typ)
  • Supply Voltage: 1.8V to 5.5V
  • Rail-to-Rail Input and Output
    • VCM: 100mV Beyond Supply Rail @ VCC = 1.8V to 5.5V

  • Unity Gain Stable up to 200pF C-Load
    • Gain Bandwidth: 350kHz
  • Slew Rate 0.12V/μs (typ)
  • Operation Ambient Temperature Range: -40°C to +125°C
  • ESD Protection JESD 22, 4000V HBM (A114)
  • SOT25 and SOT353 Packages
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/


  • Battery-powered instruments
  • Handheld test equipment
  • Medical instrumentation
  • Low voltage current sensing
  • Sensor signal conditioning
  • Sensors interfaces
  • CO detectors, pressure sensors, smoke alarms, pulse blood oximeters, glucose meters

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Standard
AEC Qualified No
Number of Channels 1
Minimum Supply Voltage (V) 1.8 V
Maximum Supply Voltage (V) 5.5 V
Supply Current @ 5V (per Op Amp) (mA) 0.017 mA
Input Offset Voltage typ (mV) 0.008 mV
Input Bias Current typ (nA) 0.07 nA
Minimum Input Common Mode Voltage (V) (V-) - 0.1 V
Maximum Input Common Mode Voltage (V) (V+) + 0.1 V
Output Current Source (mA) 5 mA
Output Current Sink (mA) 25 mA
Rail-Rail Input/Output
Operating Ambient Temperature Range (°C) -40 to 125 °C

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