Product details

Acl, min spec gain (V/V) 1 Available channels S Operating temperature range (C) -40 to 85 Output current (Typ) (mA) 15 Rating Catalog
Acl, min spec gain (V/V) 1 Available channels S Operating temperature range (C) -40 to 85 Output current (Typ) (mA) 15 Rating Catalog
SOIC (D) 8 19 mm² 3.91 x 4.9 SOT-23 (DBV) 6 5 mm² 2.9 x 1.6
  • Wide Bandwidth (80MHz, Open-Loop, G = +5)
  • High Slew Rate (900V/µs)
  • High Transconductance (95mA/V)
  • External IQ-Control
  • Low Quiescent Current (5.4mA)
  • APPLICATIONS
    • Video/Broadcast Equipment
    • Communications Equipment
    • High-Speed Data Acquisition
    • Wideband LED Drivers
    • Control Loop Amplifiers
    • Wideband Active Filters
    • Line Drivers
    • Wide Bandwidth (80MHz, Open-Loop, G = +5)
    • High Slew Rate (900V/µs)
    • High Transconductance (95mA/V)
    • External IQ-Control
    • Low Quiescent Current (5.4mA)
  • APPLICATIONS
    • Video/Broadcast Equipment
    • Communications Equipment
    • High-Speed Data Acquisition
    • Wideband LED Drivers
    • Control Loop Amplifiers
    • Wideband Active Filters
    • Line Drivers

    The OPA861 is a versatile monolithic component designed for wide-bandwidth systems, including high performance video, RF and IF circuitry. The OPA861 is a wideband, bipolar operational transconductance amplifier (OTA).

    The OTA or voltage-controlled current source can be viewed as an ideal transistor. Like a transistor, it has three terminals—a high impedance input (base), a low-impedance input/output (emitter), and the current output (collector). The OPA861, however, is self-biased and bipolar. The output collector current is zero for a zero base-emitter voltage. AC inputs centered about zero produce an output current, which is bipolar and centered about zero. The transconductance of the OPA861 can be adjusted with an external resistor, allowing bandwidth, quiescent current, and gain trade-offs to be optimized.

    Used as a basic building block, the OPA861 simplifies the design of AGC amplifiers, LED driver circuits for fiber optic transmission, integrators for fast pulses, fast control loop amplifiers and control amplifiers for capacitive sensors, and active filters. The OPA861 is available in SO-8 and SOT23-6 surface-mount packages.

    The OPA861 is a versatile monolithic component designed for wide-bandwidth systems, including high performance video, RF and IF circuitry. The OPA861 is a wideband, bipolar operational transconductance amplifier (OTA).

    The OTA or voltage-controlled current source can be viewed as an ideal transistor. Like a transistor, it has three terminals—a high impedance input (base), a low-impedance input/output (emitter), and the current output (collector). The OPA861, however, is self-biased and bipolar. The output collector current is zero for a zero base-emitter voltage. AC inputs centered about zero produce an output current, which is bipolar and centered about zero. The transconductance of the OPA861 can be adjusted with an external resistor, allowing bandwidth, quiescent current, and gain trade-offs to be optimized.

    Used as a basic building block, the OPA861 simplifies the design of AGC amplifiers, LED driver circuits for fiber optic transmission, integrators for fast pulses, fast control loop amplifiers and control amplifiers for capacitive sensors, and active filters. The OPA861 is available in SO-8 and SOT23-6 surface-mount packages.

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    Technical documentation

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    Type Title Date
    * Data sheet Wide Bandwidth Operational Transconductance Amplifier (OTA) datasheet (Rev. G) 14 May 2013
    Technical article Wanted: Stable oscillator 31 Jul 2013
    Application note Demystifying the Operational Transconductance Amplifier (Rev. A) 16 Apr 2013
    User guide DEM-OTA-SO-1A User's Guide (Rev. A) 02 Feb 2006
    Application note Noise Analysis for High Speed Op Amps (Rev. A) 17 Jan 2005

    Design & development

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

    Evaluation board

    DEM-OTA-SO-1A — Unpopulated PCB Compatible w/Wide Bandwidth Transconductance Op Amps in 8-lead SOIC (D) Pkg

    The DEM-OTA-SO-1A demonstration fixture helps designers evaluate the operation and performance of TI's Wide Bandwidth Operational Transconductance Amplifiers (OTA). This unpopulated PC board is compatible with products offered in the 8-lead SOIC (D) package.

    For more information on these types of (...)

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    Simulation model

    OPA861 PSpice Model (Rev. B)

    SBOC127B.ZIP (38 KB) - PSpice Model
    Simulation tool

    PSPICE-FOR-TI — PSpice® for TI design and simulation tool

    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 (...)
    Simulation tool

    TINA-TI — SPICE-based analog simulation program

    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 (...)
    Package Pins Download
    SOIC (D) 8 View options
    SOT-23 (DBV) 6 View options

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