MAX4238, MAX4239 Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers

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The MAX4238/MAX4239 are low-noise, low-drift, ultra-high precision amplifiers that offer near-zero DC offset and drift through the use of patented 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 A_V ≥ 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

Applications/Uses

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: 1.5µV_P-P from DC to 10Hz
150dB A_VOL, 140dB PSRR, 140dB CMRR
High Gain-Bandwidth Product
- 1MHz (MAX4238)
- 6.5MHz (MAX4239)
0.1µA Shutdown Mode
Rail-to-Rail Output (R_L = 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

	Electronic Scales
	Instrumentation Amplifiers
	Medical Instrumentation
	Strain Gauges
	Thermocouples

Key Specifications: Operational Amplifiers

Part Number

Amps Per Pkg.

Rail to Rail

Min. Stable Closed Loop Gain (V/V)

Min. Total Supply (V)

Max. Total Supply (V)

Typ. Supply Current per Amp. (µA)

Max. V_OS (µV)

Typ. CMRR @ DC (dB)

Typ PSRR @ DC (dB)

Max. Input I_BIAS (nA)

Typ. Unity Gain BW (MHz)

Input Voltage Noise Density (nV/√Hz)

Input Current Noise Density (pA/√Hz)

Low Power Shutdown

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX4238

Output Only

2.7

5.5

600

140

0.01

0.001

Yes

SOIC/8
SOT-23/6
THIN QFN (Dual)/6

-40 to +125

$0.85 @ 1k

MAX4239

6.5

$0.85 @ 1k

See All Operational Amplifiers (141)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.