Precision, 20MHz, 0.9pA Ib, RRIO, CMOS Operational Amplifier - OPA320


Precision, 20MHz, 0.9pA Ib, RRIO, CMOS Operational Amplifier

Recommended alternative parts

  • OPA376  - The device has the SAME FUNCTIONALITY and PINOUT as the compared device but is NOT an exact equivalent.   Similar to the OPA320 with 0.025mV VIO, 5.5MHz, and 10pA Ib
  • OPA350  - The device has the SAME FUNCTIONALITY as the compared device, but is not pin-for-pin equivalent and may not be parametrically equivalent.   Similar to the OPA320 with 0.5mV VIO, 38MHz GBW, and 10pA Ib
  • OPA365  - The device has the SAME FUNCTIONALITY and PINOUT as the compared device but is NOT an exact equivalent.   Similar to the OPA320 with 0.2mV VIO, 50MHz GBW, and 10pA Ib


The OPA320 (single) and OPA2320 (dual) are a new generation of precision, low-voltage CMOS operational amplifiers optimized for very low noise and wide bandwidth while operating on a low quiescent current of only 1.45mA.

The OPA320 series is ideal for low-power, single-supply applications. Low-noise (7nV/√Hz) and high-speed operation also make them well-suited for driving sampling analog-to-digital converters (ADCs). Other applications include signal conditioning and sensor amplification.

The OPA320 features a linear input stage with zero-crossover distortion that delivers excellent common-mode rejection ratio (CMRR) of typically 114dB over the full input range. The input common-mode range extends 100mV beyond the negative and positive supply rails. The output voltage typically swings within 10mV of the rails.

In addition, the OPAx320 have a wide supply voltage range from 1.8V to 5.5V with excellent PSRR (106dB) over the entire supply range, making them suitable for precision, low-power applications that run directly from batteries without regulation.

The OPA320 (single version) is available in a SOT23-5 package; the OPA320S shut-down single version is available in an SOT23-6 package. The dual OPA2320 is offered in SO-8, MSOP-8, and DFN-8 packages, and the OPA2320S (dual with shut-down) in an MSOP-10 package.


  • Precision with Zero-Crossover Distortion:
    • Low Offset Voltage: 150µV (max)
    • High CMRR: 114dB
    • Rail-to-Rail I/O
  • Low Input Bias Current: 0.9pA (max)
  • Low Noise: 7nV/√Hz at 10kHz
  • Wide Bandwidth: 20MHz
  • Slew Rate: 10V/µs
  • Quiescent Current: 1.45mA/ch
  • Single-Supply Voltage Range: 1.8V to 5.5V
  • OPA320S, OPA2320S:
    • IQ in Shutdown Mode: 0.1µA
  • Unity-Gain Stable
  • Small Packages:
    • SOT23, MSOP, DFN

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Parametrics Compare all products in Precision Amplifier

Number of Channels (#)
Total Supply Voltage (Min) (+5V=5, +/-5V=10)
Total Supply Voltage (Max) (+5V=5, +/-5V=10)
Iq per channel (Max) (mA)
Slew Rate (Typ) (V/us)
Vos (Offset Voltage @ 25C) (Max) (mV)
Offset Drift (Typ) (uV/C)
CMRR (Min) (dB)
GBW (Typ) (MHz)
IIB (Max) (pA)
Io (Typ) (mA)
Vn at 1kHz (Typ) (nV/rtHz)
Operating Temperature Range (C)
Approx. Price (US$)
OPA320 OPA2320 OPA2320-Q1
1     2     2    
1.8     1.8     1.8    
5.5     5.5     5.5    
1.75     1.6     1.6    
10     10     10    
0.15     0.15     0.15    
1.5     1.5     1.5    
100     100     100    
20     20     20    
0.9     0.9     0.9    
65     65      
8.5     8.5     8.5    
Catalog     Catalog     Automotive    
-40 to 125     -40 to 125     -40 to 125    
0.80 | 1ku     1.25 | 1ku     1.48 | 1ku    

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