Seiko S-81250PG. Input: 12Vdc. Output: 5Vdc, 100mA. TO92, three lead voltage regulator. Large quantity available.
Spec sheet available in PDF format.
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They're Grrrrrrreat!!! 
Reviewer:
A viewer
from SAGINAW, TX USA
I love these little regulators!! Mine put out around 5.6V. If you want to put out a little less than 5V, simple, add a diode - it's good to have a diode anyway. My test reg has been powering 4 LED's through a Nand Gate and an Or Gate with a 9.5V input for two weeks 24/7 on the left side of my breadboard with no problems and zero heat!! I highly recommend them. Yes, I have a diode from the output to my board.
1-1 of1
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