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MAX4238, MAX4239

Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers

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Status Explanations for product status codes

Part Number Status
MAX4238 Active: In Production. See Ordering Information for details.
MAX4239 Active: In Production. See Ordering Information for details.


The MAX4238/MAX4239 are low-noise, low-drift, ultra-high precision amplifiers that offer near-zero DC offset and drift through the use of autocorrelating zeroing techniques. This method constantly measures and compensates the input offset, eliminating drift over time and temperature and the effect of 1/f noise. Both devices feature rail-to-rail outputs, operate from a single 2.7V to 5.5V supply, and consume only 600µA. An active-low shutdown mode decreases supply current to 0.1µA.

The MAX4238 is unity-gain stable with a gain-bandwidth product of 1MHz, while the decompensated MAX4239 is stable with AV ≥ 10V/V and a GBWP of 6.5MHz. The MAX4238/MAX4239 are available in 8-pin narrow SO, 6-pin TDFN and SOT23 packages.

Data Sheet

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Key Features

  • Ultra-Low, 0.1µV Offset Voltage
    • 2.0µV (max) at +25°C
    • 2.5µV (max) at -40°C to +85°C
    • 3.5µV (max) at -40°C to +125°C
  • Low 10nV/°C Drift
  • Specified over the -40°C to +125°C Automotive Temperature Range
  • Low Noise: 1.5µVP-P from DC to 10Hz
  • 150dB AVOL, 140dB PSRR, 140dB CMRR
  • High Gain-Bandwidth Product
    • 1MHz (MAX4238)
    • 6.5MHz (MAX4239)
  • 0.1µA Shutdown Mode
  • Rail-to-Rail Output (RL = 1kΩ)
  • Low 600µA Supply Current
  • Ground-Sensing Input
  • Single 2.7V to 5.5V Supply Voltage Range
  • Available in a Space-Saving 6-Pin SOT23 and TDFN Packages


  • Automatic Test Equipment (ATE)
  • Cardiac Monitor
  • Electronic Scales
  • Industrial: Process Measurement and Control
  • Instrumentation Amplifiers
  • Medical Instrumentation
  • Programmable Logic Controllers (PLCs)
  • Strain Gauges
  • Thermocouples

Key Specifications:

Operational Amplifiers
Part Number Amps. Rail to Rail VSUPPLY (Total)
ICC per Amp.
Low Input Bias CMOS Inputs Input IBIAS
Unity Gain BW
min max typ max typ typ max typ < See Notes
MAX4238  1 Output Only 2.7 5.5 600 2 140 140 Yes 0.01 1 25 $0.97 @1k
MAX4239  6.5 $0.96 @1k
See All Operational Amplifiers (163)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX4238, MAX4239: Typical Operating Circuit
Typical Operating Circuit

More Information

Topmark Coding MAX4238
Topmark Coding MAX4239
New Product Press Release   2002-05-30 ]

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Document Ref.: 19-2424 Rev 4; 2014-02-03
This page last modified: 2014-02-03