L7812CV-DG

L7812CV-DG is a TO-220 ordering code for the STMicroelectronics L7812 fixed 12 V positive linear regulator, delivering up to 1.5 A with internal thermal overload and short-circuit protection for the 12 V rails that run relays, fans, analog front ends and industrial control logic. As on its 5 V sibling, the -DG suffix is ST's own variant code for the dual-gauge heatsink version of the TO-220 tab: the electrical device is the standard C-grade 12 V regulator, but incoming inspection and heatsink hardware should be checked against the DG tab drawing, not a standard-gauge L7812CV. The C grade is the wider-tolerance selection of the family; the A grade is the tighter ±2 % option, so confirm which grade your design was qualified on before accepting a substitute offer. The procurement advantage of the L78 architecture is simplicity that survives the field — two capacitors, no inductor, no switching noise on sensitive analog rails, and self-protection when a load faults. Selection advice: a linear 12 V rail from a 24 V bus burns roughly (24 − 12) V × IOUT as heat in this package, so bolt the tab to a real heatsink and check the thermal design at full load; where efficiency or a sealed enclosure dominates, use a buck regulator and reserve this code for noise-sensitive or low-current 12 V duties. Parameters verified against STMicroelectronics documentation.