Silicon Bipolar Darlington Amplifier in SOT-89 Package

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The ADA-4789 is a low cost high linearity Silicon Bipolar Darlington amplifier fabricated using Broadcom’ HP-25 Silicon Bipolar Process with 25 GHz fT and 30 GHZ fmax.  The Darlington feedback structure provides inherent broad bandwidth performance, resulting in useful operating frequency up to 2.5 GHz. It is also very easy to use as it is input and output matched to 50 ohms.


  • High Linearity 32.6dBm (60mA), 33.2dBm (80mA) at 900MHz & 28.8dBm at 2GHz
  • Flat, Broadband Frequency Response up to 1GHz
  • Low Thermal Resistance (52 Deg C / Watt)
  • Internal 50 Ohm matched
  • Single Current Supply
  • Applications

  • IF Amplifier & Pre-Driver Amplifier for Cellular Basestation
  • CATV Distribution/Drop Amplifier
  • Lifecycle Status


    Replacement Part

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    Substance Compliance

    • RoHS6
      Fully Compliant
    Specification Value
    Lifecycle Obsolete
    Distrib. Inventory No
    RoHS6 Compliant Y
    Frequency (GHz) DC-2.5
    Bias Condition (V@mA) 3.8V@60mA
    NF (dB) 4.2
    Gain (dB) 16.5
    P1dB (dBm) 17.1
    OIP3 (dBm) 32.6
    Package SOT-89
    ADS Model 2 i
    Obsolescence Notice1 i
    Product Change Notice (PCN)3 i
    Reliability Data Sheet1 i
    S-Parameter2 i