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    The SGM8558-1 (single), SGM8558-2 (dual), SGM8558-3 (single with shutdown) and SGM8558-4 (quad) high output drive CMOS operational amplifiers feature a peak output current of 230mA, rail-to-rail output capability from a single 2.8V to 5.5V supply. These amplifiers exhibit a high slew rate of 8V/μs and a gain-bandwidth product (GBP) of 15MHz. The SGM8558-1/2/3/4 can drive typical headset levels (32Ω), as well as bias an RF power amplifier in wireless handset applications.

    These operational amplifiers are designed to be part of the power amplifier control circuitry, biasing RF power amplifiers in wireless headsets. The SGM8558-3 offers a shutdown feature that drives the output low. This ensures that the RF power amplifier is fully disabled when needed, preventing unconverted signals to the RF antenna.

    The SGM8558-1/2/3/4 also offer low input offset voltage, low input offset voltage drift, wide bandwidth and high output drive.

    The SGM8558-1 is available in Green SOIC-8 and SOT-23-5 packages. The SGM8558-2 is available in Green TDFN-3×3-8L and SOIC-8 packages. The SGM8558-3 is available in a Green SOT-23-6 package. The SGM8558-4 is available in a Green SOIC-14 package. They operate over an ambient temperature range of -40 to +125.



    • 230mA Output Drive Capability

    • Low Input Offset Voltage: 15μV (MAX)

    • Low Noise: 8nVHz at 1kHz

    • 230mA Current Limitation

    • Over-Temperature Protection

    • Supply Voltage Range: 2.8V to 5.5V

    • Supply Current: 0.86mA/Amplifier (TYP)

    • Gain-Bandwidth Product: 15MHz

    • High Slew Rate: 8V/μs

    • Voltage Gain (RL = 2kΩ): 139dB

    • Power Supply Rejection Ratio: 130dB

    • No Phase Reversal for Overdriven Inputs

    • Unity-Gain Stable for Capacitive Loads to 780pF

    • -40 to +125 Operating Temperature Range

    • Available in a Green SOIC-14 Package


    RF Power Amplifier Biasing Controls

    Portable/Battery-Powered Audio Applications

    Portable Headphone Speaker Drivers (32Ω)

    Audio Hands-Free Car Phones (Kits)

    Laptop/Notebook Computers/TFT Panels

    Sound Ports/Cards

    Set-Top Boxes

    Digital-to-Analog Converter Buffers

    Transformer/Line Drivers

    Motor Drivers

    Part NumberStatusPackagePinsPb-FreeTemp Range
    SGM8558-4XS14G/TRProductionSOIC-1414Y-40℃ to +125℃Samples