It is designed to hold a microcontroller or DSP in reset until the supply has been stable for at least 120ms, giving the oscillator and core logic time to settle. The output is active-low push-pull, so it drives the reset pin directly without needing an external pull-up resistor.
3.08V threshold — why that number matters for 3.3V systems
The 3.08V threshold sits about 7% below a nominal 3.3V rail. That margin keeps the reset from triggering on normal ripple or load transients, but still catches a brownout before the logic rails collapse. For a 3.3V microcontroller, this threshold is a good fit — it trips before the processor's minimum operating voltage, so the reset is asserted while the supply is still high enough for the reset logic to function.
Housed in a three-pin SOT-23-3 package, the TPS3839G33DBZT takes up minimal board area — about 2.9 mm × 1.6 mm. Surface-mount assembly is straightforward; the small footprint means it fits on the back of a densely populated board or near the processor's supply pins.