The best replacement for zener diode is diode.

The best alternatives to zener diode are rated as following:

★★★★★	diode
★★★★	voltage regulator
★★★	regular diode
★★★	rectifier diode
★★	switching diode
★★	schottky
★	pn diode
★	normal diode
★	silicon diode
★	tvs
★	voltage divider
★	avalanche diode
	germanium diode
	pn junction

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Speaking about zener diode, one probably shouldn't forget about voltage regulator.

Other search terms related to zener diode and their ratings are:

★★★★★	voltage regulator
	voltage drop

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zener diode

diode

voltage regulator