MMSZ12ET1 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 Designed for Optimal.
ESD Rating of Class 3 (>16 kV) per Human Body Model Peak Power − 225 W (8 X 20 ms)
1 Cathode
2 Anode
2 1 SOD−123 CASE.
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