Single-rail supervisor with a 4.125V trip point
The DS1233-15+ is a single-channel Simple Reset/Power-On Reset supervisor from Analog Devices' EconoReset series. It monitors one voltage rail and asserts an Active Low, Open Drain reset output when the supply drops below 4.125V (the threshold), holding the reset for a minimum of 250ms after the rail recovers. This part sits in the Microcontrollers & Processors category — it is the reset watchdog for a single MCU or processor core, not a multi-voltage sequencer.
Industrial temperature and through-hole packaging
Housed in a TO-92-3 (TO-226AA) through-hole package, it is a drop-in replacement for legacy socketed or hand-soldered designs. The three pins are GND, RESET, and VCC — no external timing capacitor needed; the 250ms timeout is internal. The open-drain output lets the reset line be wire-ORed with other supervisors or a manual reset button — a pull-up resistor to the MCU's VCC is required.