Supervisor IC for 3.3V rail monitoring
It asserts a reset output when the monitored supply drops below this threshold and holds reset for a minimum of 140ms after the supply recovers, providing a clean power-on reset signal for microcontrollers, DSPs, and other logic devices. The push-pull output can be configured for either active-high or active-low reset polarity, giving flexibility in system integration. Housed in a SOT-23-5 package, it is a compact solution for board-level voltage supervision in space-constrained designs.
3.08V threshold — matching the monitored rail
The 3.08V threshold is set for monitoring 3.3V nominal supply rails. When the supply falls to 3.08V or below, the reset output asserts, protecting downstream logic from operating during undervoltage conditions. This threshold is a fixed internal reference — no external resistor divider is needed, which saves board area and eliminates tolerance stack-up. For a 3.3V rail, this threshold provides a typical undervoltage trip point around 93% of nominal, giving early warning before the rail drops into the brownout region of most 3.3V logic.
140ms reset timeout — boot sequencing margin
This is a fixed delay — no external capacitor is required. The 140ms figure is a minimum; the actual timeout may be longer, but the system designer can rely on at least 140ms of reset-asserted time after the supply crosses the threshold. This is adequate for most MCU boot sequences and crystal startup times in industrial and automotive applications.
The extended temperature range ensures reliable reset behavior in engine bays, factory floor enclosures, and base station cabinets without derating concerns.
It is ROHS3 compliant, suitable for lead-free assembly processes.