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


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



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 Op Amps

Number of Channels (#)
Total Supply Voltage (Min) (+5V=5, +/-5V=10)
Total Supply Voltage (Max) (+5V=5, +/-5V=10)
GBW (Typ) (MHz)
Slew Rate (Typ) (V/us)
Vos (Offset Voltage @ 25C) (Max) (mV)
Offset Drift (Typ) (uV/C)
Iq per channel (Typ) (mA)
Vn at 1kHz (Typ) (nV/rtHz)
CMRR (Typ) (dB)
Operating Temperature Range (C)
Package Group
Approx. Price (US$)
Package Size: mm2:W x L (PKG)
Input Bias Current (Max) (pA)
Output Current (Typ) (mA)
Additional Features
OPA320 OPA2320 OPA2320-Q1
1    2    2   
1.8    1.8    1.8   
5.5    5.5    5.5   
20    20    20   
10    10    10   
0.15    0.15    0.15   
1.5    1.5    1.5   
1.5    1.5    1.5   
8.5    8.5    8.5   
114    114    114   
Catalog    Catalog    Automotive   
-40 to 125    -40 to 125    -40 to 125   
SOT-23    SOIC
0.80 | 1ku    1.25 | 1ku    1.48 | 1ku   
5SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)
6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)   
See datasheet (SON)    8VSSOP: 15 mm2: 4.9 x 3(VSSOP)   
0.9    0.9    0.9   
65    65    65   
EMI Hardened
EMI Hardened
EMI Hardened   

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WEBENCH® Designer OPA320

Amplifier Topology
Desired Power Supply Voltage
Positive Supply (Vcc):  V
Negative Supply (Vee):  V
Allowed Power Supply(Vcc-Vee) = 1.8 to 5.5 V
Desired Input and Output Requirements
  Min Max
Vin  V  V
Vout  V  V
Minimum Temperature = -40.0 °C
Maximum Temperature = 125.0 °C