MMSZ12ET1G regulators equivalent, zener voltage regulators.
http://onsemi.com
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500 mW Rating on FR−4 or FR−5 Board Wide Zener Reverse Voltage Range − 2.4 V to 56 V Package Des.
ESD Rating of Class 3 (> 16 kV) per Human Body Model Peak Power − 225 W (8 X 20 ms) AEC−Q101 Qualified and PPAP Capable .
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