Texas Instruments OPA3S328 CMOS Operational Amplifiers

Texas Instruments OPA3S328 CMOS Op-Amps offer precision, low-voltage, and low-input bias-current in a small package. The device provides integrated switches that are optimized for flexible transimpedance applications. The OPA3S328 features low input bias current and low input capacitance, enabling high-frequency transimpedance gains at low photocurrent operation (< 1nA).

The TI OPA3S328 CMOS Op-Amps compiles integrated switches, low offset, and rail-to-rail output performance to enable high accuracy across multiple decades of current values. A small package and integrated switches allow the OPA3S328 to access selectable transimpedance gains and help reduce size for space-constrained applications.

The zero-crossover input technology featured on the device permits the flexibility for the input common-mode range to span the entire supply range without offset deviations. The OPA3S328 provides the enable-disable capability to allow for portable, handheld applications in test and measurement. When disabled, the OPA3S328 output impedance is typically 100GΩ, allowing for wired-OR applications using multiple transimpedance channels.


  • Precision operational amplifier with integrated switches for transimpedance applications
  • 40MHz Wide bandwidth
  • 60µV (max) Low offset voltage
  • 1µV/°C (max) Very low offset drift
  • 0.2pA Low input bias current
  • Rail-to-rail input and output
  • Zero-crossover input stage
  • 6.1nV/√Hz at 10kHz Low voltage noise
  • 0.125pA/√Hz at 10kHz Low current noise
  • 10pA Low leakage switches
  • 30V/µs Slew rate
  • 3.8mA per Channel quiescent current
  • 30µA Current in shutdown mode
  • 100GΩ Output impedance in shutdown mode
  • 2.2V to 5.5V Single-supply voltage range
  • Unity-gain stable
  • Small packages:
    • 20-lead, 3.5mm x 3.5mm VQFN
    • 2.0mm x 2.0mm DSBGA


  • Optical transport inter-dc interconnect
  • Optical module
  • Optical network terminal unit (ONT)
  • Small cell base station
  • Digital multimeter (DMM)
  • Data acquisition (DAQ)

Block Diagram

Block Diagram - Texas Instruments OPA3S328 CMOS Operational Amplifiers
Published: 2022-03-18 | Updated: 2022-06-15