I'm not exactly sure what you're looking for. Without any circuit information, all I can say for replacement is...i need ~20s timer with 0.5sec o/p to run from a BL-5C lipo battery. the can regulates the spray dose. the motor drain is <<200mA. normally driven by 2x AA for >20days. >3.7v burned out oem timer. need parts list.
Uh Oh, my bad as I read into it 20 min not the actual 20 sec posted. Yes, a 555 would do just fine. Thinking about it somewhere I have an old 555 on a board which was originally used as a wiper delay (automotive). A Google of 555 Timer Switch will bring up plenty of already fabricated boards on Amazon and similar.To be clear is this timer to activate the motor for .5 sec every 20 seconds? If so a TLC555 would be fine if not a micro.
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