MAX4239:Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers

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.

Key Features
  • DC Performance Ideal for High-Precision Sensor Interface
    • 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° to +125°C
    • Low 10nV/°C Drift
    • Low Noise: 1.5µVP-P from DC to 10Hz
    • 150dB AVOL, 140dB PSRR, 140dB CMRR
    • High Gain-Bandwidth Product
      • 1MHz (MAX4238)
      • 6.5MHz (MAX4239)
    • Ground-Sensing Input
    • Rail-to-Rail Output (RL = 1kΩ)
  • Low Power Consumption Reduces System Power
    • Single 2.7V to 5.5V Supply Voltage Range
    • 600µA Supply Current
    • 0.1µA Shutdown Mode
MAX4238, MAX4239: Typical Operating Circuit
MAX4238, MAX4239: Typical Operating Circuit
  • Automatic Test Equipment (ATE)
  • Cardiac Monitor
  • Electronic Scales
  • Industrial: Process Measurement and Control
  • Instrumentation Amplifiers
  • Medical Instrumentation
  • Programmable Logic Controllers (PLCs)
  • Strain Gauges
  • Thermocouples
titleDownload file
MAX4238-MAX4239 Data SheetMAX4238-MAX4239.pdf
Part NumberAmps.Rail to RailVSUPPLY (Total)
ICC per Amp.
Low Input Bias CMOS InputsInput IBIAS
Unity Gain BW
minmaxtypmaxtyptypmaxtyp<See Notes
MAX42381Output Only2.75.56002140140Yes0.01125SOIC(N)/8
$0.97 @1k
$0.96 @1k
Design kits & evaluation modules
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX4239ASANo Longer AvailableMAX4239ASA+SOIC(N),;8 pin;30.9 mm²-40°C to +125°CNo
MAX4239ASA+ActiveSOIC(N),;8 pin;30.9 mm²-40°C to +125°CLead Free
MAX4239ASA+TActiveSOIC(N),;8 pin;30.9 mm²-40°C to +125°CLead Free
MAX4239ASA-TNo Longer AvailableMAX4239ASA+TN.SO;8 pin-40°C to +125°CSee data sheet
MAX4239ATT+ActiveTDFN-EP,;6 pin;9.6 mm²-40°C to +125°CLead Free
MAX4239ATT+TActiveTDFN-EP,;6 pin;9.6 mm²-40°C to +125°CLead Free
MAX4239AUT#TG16No Longer AvailableMAX4239AUT+TSOT,;6 pin;9 mm²-40°C to +125°C
MAX4239AUT+ActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX4239AUT+TActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX4239AUT-TNo Longer AvailableMAX4239AUT+TSOT,;6 pin;9 mm²-40°C to +125°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX4239AUT/V+ActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX4239AUT/V+TActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX4238-MAX4239.pdf MAX4239
The Zero-Transistor IC, a New Plateau in IC Design MAX5492
Differential Gain and Phase—Why Measure It, if You Cannot See It? MAX5858A
MAX4239.pdf MAX4239