Product details


Number of channels (#) 1 GBW (Typ) (MHz) 8000 Total supply voltage (Max) (+5V=5, +/-5V=10) 5.25 Total supply voltage (Min) (+5V=5, +/-5V=10) 3.3 Vos (offset voltage @ 25 C) (Max) (mV) 2.5 Rail-to-rail No Features Shutdown, Decompensated BW @ Acl (MHz) 2500 Operating temperature range (C) -40 to 125 open-in-new Find other Transimpedance amplifiers

Package | Pins | Size

WSON (DSG) 8 4 mm² 2 x 2 open-in-new Find other Transimpedance amplifiers


  • High Gain Bandwidth Product: 8 GHz
  • Decompensated, Gain ≥ 7 V/V (Stable)
  • Low Input Voltage Noise: 0.98 nV/√Hz
  • Slew Rate: 2750 V/µs
  • Low Input Capacitance:
    • Common-Mode: 0.6 pF
    • Differential: 0.2 pF
  • Wide Input Common-Mode Range:
    • 0.4 V from Positive Supply
    • 1.1 V from Negative Supply
  • 3 VPP Total Output Swing
  • Supply Voltage Range: 3.3 V to 5.25 V
  • Quiescent Current: 17.8 mA
  • Package: 8-Pin WSON
  • Temperature Range: –40 to +125°C

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The OPA855 is a wideband, low-noise operational amplifier with bipolar inputs for wideband transimpedance and voltage amplifier applications. When the device is configured as a transimpedance amplifier (TIA), the 8-GHz gain bandwidth product (GBWP) enables high closed-loop bandwidths at transimpedance gains of up to tens of kΩs.

The graph below shows the bandwidth and noise performance of the OPA855 as a function of the photodiode capacitance when the amplifier is configured as a TIA. The total noise is calculated along a bandwidth range extending from dc to the calculated frequency, f, on the left-hand scale. The OPA855 package has a feedback pin (FB) that simplifies the feedback network connection between the input and the output.

The OPA855 is optimized to operate in optical time-of-flight (ToF) systems where the OPA855 is used with time-to-digital converters, such as the TDC7201. Use the OPA855 to drive a high-speed analog-to-digital converter (ADC) in high-resolution LIDAR systems with a differential output amplifier, such as the THS4541 or LMH5401.



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Technical documentation

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Type Title Date
* Datasheet OPA855 8-GHz Gain Bandwidth Product, Gain of 7-V/V Stable, Bipolar Input Amplifier datasheet (Rev. A) Oct. 22, 2018
Application note High Speed ADCs and Amplifiers for Flow Cytometry Applications Oct. 12, 2020
Technical article 3 common questions when designing with high-speed amplifiers Jul. 17, 2020
White paper An Introduction to Automotive LIDAR (Rev. A) May 21, 2020
Application note Time of Flight and LIDAR - Optical Front End Design Feb. 04, 2020
Application note Maximizing the dynamic range of analog fronts ends having a transimpedance amp Jun. 14, 2019
Application note Easily improve the performance of analog circuits with decompensated amplifiers (Rev. A) May 21, 2019
Application note Transimpedance amplifier circuit. (Rev. A) Feb. 01, 2019
User guide DEM-OPA-WSON8-EVM User's Guide Sep. 07, 2018
User guide OPA855DSGEVM User's Guide Jul. 16, 2018
Technical article What you need to know about transimpedance amplifiers – part 2 Sep. 01, 2016
Technical article What you need to know about transimpedance amplifiers – part 1 May 06, 2016
Technical article SPICE it up: How to extract the input capacitance of an op amp (part 3) Mar. 21, 2016
Application note AN-1604 Decompensated Operational Amplifiers (Rev. B) May 01, 2013
Application note AN-1803 Design Considerations for a Transimpedance Amplifier (Rev. A) May 01, 2013
Application note Transimpedance Considerations for High-Speed Operational Amplifiers Nov. 22, 2009
Application note Compensate Transimpedance Amplifiers Intuitively (Rev. A) Mar. 30, 2005
Application note Using a decompensated op amp for improved performance Mar. 11, 2005
Application note Noise Analysis for High Speed Op Amps (Rev. A) Jan. 17, 2005

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide
The DEM-OPA-WSON8-EVM is an unpopulated evaluation module for the single channel op-amps in the DSG (8-pin WSON) package. This EVM is designed to high-speed performance specifications and is compatible with amplifiers that have over 1 GHz of gain bandwidth.
  • Configured for split supply operation and modified for single supply 
  • Configurable for inverting and non-inverting gain configurations 
  • Includes connections for termination resistors to match to standard 50-Ω input/output impedance test equipment
  • Inputs and Outputs use standard SMA connector footprints
document-generic User guide
The OPA855DSG EVM is an evaluation module for the single OPA855 in the DSG (8-pin WSON) package.  The OPA855DSG EVM is designed to quickly demonstrate the functionality and versatility of the amplifier.  The EVM is ready to connect to power, signal source, and test instruments through the (...)
  • Configured for split supply operation and modified for single supply
  • Default non-inverting gain of 7 configuration can be reconfigured for other gains
  • Designed for connection to standard 50-Ω input/output impedance test equipment
  • Inputs and Outputs include SMA connectors

Design tools & simulation

SBOMAP6B.ZIP (14 KB) - TINA-TI Spice Model
SBOMAP7C.TSC (167 KB) - TINA-TI Reference Design
SBOMB43D.ZIP (37 KB) - PSpice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide

CAD/CAE symbols

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WSON (DSG) 8 View options

Ordering & quality

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