100 MHz voltage feedback amplifier in an 8-SOIC
It is a workhorse for high-speed signal conditioning — ADC input buffers, video distribution amplifiers, pulse circuits, and active filters where the 90 mA output current per channel drives a 50 Ω or 75 Ω back-terminated line directly. The 8-SOIC footprint and surface-mount assembly keep the board layout clean for the signal path.
Package and mounting
The 100 MHz -3dB point is the small-signal bandwidth; the 100 V/µs slew rate sets the large-signal limit. For a 5 V peak-to-peak output step, the full-power bandwidth works out to about 3.2 MHz — beyond that the output slews and distortion climbs. This is a voltage-feedback topology, so it is unity-gain stable and compensates with a single external capacitor if you need to reduce bandwidth for noise. The 3 µA input bias current and 500 µV input offset voltage are typical for a high-speed bipolar front end — not a precision DC amplifier, but fine for AC-coupled paths where the offset is blocked by a series capacitor.
Temperature grade: commercial only — plan the BOM accordingly
If the board sees an industrial cabinet, outdoor telecom enclosure, or automotive environment, the THS4031CDR is not rated for it. Check the BOM temperature requirements before committing the C-grade part to a prototype that will go to production in a wider-temperature system.