STWD100NYWY3F

STWD100NYWY3F is the tape-and-reel SOT-23-5 ordering code for the STMicroelectronics STWD100 watchdog timer, listed as Active on the ST eStore page for this exact code. Every suffix position follows the datasheet ordering scheme: the N marks the open-drain active-low watchdog output, the Y version sets a watchdog timeout of 1.6 s typical (1.12 s minimum, 2.24 s maximum) and a reset pulse width of 210 ms typical (140 ms minimum, 280 ms maximum), the WY letters are the SOT-23-5 package, the 3 is the -40 °C to +125 °C range and the F is ECOPACK tape-and-reel packing, while the absence of a grade letter means the industrial grade. It draws 13 µA typical and 26 µA maximum, with a start-up threshold of 2.2 V typical. The selection point is a hardware watchdog that keeps supervising when firmware hangs: an independent timeout path for embedded controllers in metering, industrial control and appliances. Selection advice: pick the timeout letter against the longest legitimate interval between watchdog service pulses, not against the main-loop time, or field units will reset under load peaks. Parameters verified against the ST STWD100 datasheet DocID14134 (ordering information scheme and the electrical table for the Y version).