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Does anyone know what is the difference between L78XX with L78XXC? Is the C meaning capacitor?

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    \$\begingroup\$ Difficult to answer unless you give a datasheet. For ST it means a different temperature grade and other things, but maybe it doesn't for your manufacturer. \$\endgroup\$
    – pipe
    May 8, 2017 at 14:22

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L78xxC is the version rated for the commercial operating temperature range, which can only go as low as 0 C. See datasheet.

The non-C version, L78xx, can go as low as -55 C and uses the huge metallic TO-3 can package. You'll probably see it in space/military/industrial applications... if you can find any that is not already obsolete (this is a very old part/package).

From an older ST datasheet:

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