2.93V threshold supervisor for 3.3V rails
The TPS3705-33DGNR is a Texas Instruments Simple Reset/Power-On Reset supervisor IC that monitors a single 3.3V supply rail and asserts an active-low reset when the voltage falls to 2.93V — the typical threshold for a 3.3V system brownout. This part is commonly specified by design engineers who need a glitch-filtered reset signal for an MCU, FPGA, or DSP in an industrial or telecom power domain.
140ms timeout: glitch immunity vs. brownout speed
The 140ms minimum reset timeout gives the downstream processor time to stabilize after the supply returns, while ignoring short supply dips that would otherwise cause nuisance resets. For systems with a noisy supply or a slow-starting DC-DC converter, this timeout window is a deliberate design choice — shorter than many competitors' 200ms+ timers, but long enough to ride through most 50/60 Hz half-cycle dropouts. The TLV803ED29DBZR steps down to a 33ms minimum timeout, which is too short for many processor boot sequences — the TPS3705-33DGNR's 140ms window is the safer choice for a general-purpose MCU reset.
The 8-HVSSOP package with exposed pad is a current TI package, so no package-obsolescence risk either.
Package and thermal: 8-HVSSOP exposed pad
The 8-HVSSOP package (0.118-inch width, 3.00mm width) includes an exposed pad that must be soldered to a PCB ground plane for rated thermal performance.