Panasonic Zener Diode, 30V 5% 1 W SMT 2-Pin Mini2 F3 B. Zener Diodes 1W, DZ2W Series, Panasonic. Zener Diodes, Panasonic. Maximum Zener Impedance 30Ω. The MCP7940M includes a digital trimming circuit for accuracy which can compensate for crystal tolerance and temperature.
eBay