L7812CV STMicroelectronics 12V Linear Voltage Regulator (TO-220-3)

Same 12V, 1.5A regulation as the precision ABV part, built to the standard tolerance grade that covers most 12V applications - running a cooling fan, a relay coil, or a piece of analog circuitry that doesn't care about a fraction of a volt either way. Input range and TO-220 package match the rest of the 78xx family, so it drops into the same heatsinking and layout conventions as the 5V and 15V regulators in the same line. The sensible default pick for a 12V rail whenever a project doesn't have a specific reason to pay for the precision grade instead.