MAX4238: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
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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
MAX4238ASANo Longer AvailableMAX4238ASA+SOIC(N),;8 pin;30.9 mm²-40°C to +125°CNo
MAX4238ASA+ActiveSOIC(N),;8 pin;30.9 mm²-40°C to +125°CLead Free
MAX4238ASA+TActiveSOIC(N),;8 pin;30.9 mm²-40°C to +125°CLead Free
MAX4238ASA-TNo Longer AvailableMAX4238ASA+TN.SO;8 pin-40°C to +125°CSee data sheet
MAX4238ATT+ActiveTDFN-EP,;6 pin;9.6 mm²-40°C to +125°CLead Free
MAX4238ATT+TActiveTDFN-EP,;6 pin;9.6 mm²-40°C to +125°CLead Free
MAX4238AUTNo Longer AvailableMAX4238AUT+SOT,;6 pin;9 mm²-40°C to +125°CNo
MAX4238AUT#TG16No Longer AvailableMAX4238AUT+TSOT,;6 pin;9 mm²-40°C to +125°C
MAX4238AUT+ActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX4238AUT+TActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX4238AUT-TNo Longer AvailableMAX4238AUT+TSOT,;6 pin;9 mm²-40°C to +125°CNo
MAX4238AUT-TG16No Longer AvailableMAX4238AUT+SOT,;6 pin;9 mm²-40°C to +125°CNo
MAX4238AUT/V+ActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX4238AUT/V+TActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
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