Standard Zener voltage tolerance is 20%.Add suffix "A" for 10% tolerance ,suffix "B" for 5% tolerance and suffix "C" for 2% tolerance Other tolerance, non standard and h.

ZMM5221

ZMM5221B

ZMM5222

ZMM5222B

ZMM5223

ZMM5223B

ZMM5224

ZMM5224B

ZMM5225

ZMM5225B

ZMM5226

ZMM5226B

ZMM5227