Is from an LED board from a modern Pinball machine. Seems like the output is connected to a 74HC594D legs RCLR and SRCLR.

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1 Answer 1


Possibly ST Microelectronics STWD100NYWY3F watchdog timer. However other SOT23-5 ICs could bear this marking, so this is by no means definitive.

Table of ordering information

  • \$\begingroup\$ The decoupling capacitor connected to pin 5 (VCC), and the apparent 10K pullup resistor on pin 1 (WDO), would appear to support your theory. \$\endgroup\$
    – user4574
    Dec 7, 2021 at 6:46
  • \$\begingroup\$ It was actually the chip JYelton posted. I really appreciate it!! \$\endgroup\$
    – DKeruza
    Dec 7, 2021 at 17:40

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