12 V fixed rail for analog and control boards
The Texas Instruments LM7812CT/NOPB is a classic 12 V fixed-output linear regulator in the 78xx family, delivering up to 1 A continuous in a TO-220-3 through-hole package. It's the go-to part when you need a clean, regulated 12 V rail from an unregulated DC supply — think op-amp supplies, sensor excitation, relay coil power, or the analog front-end on a motor drive board.
72 dB ripple rejection — why it matters for sensitive loads
The 72 dB PSRR at 120 Hz is the spec that separates this part from a generic 78xx. That 120 Hz ripple is exactly what you get from a full-wave rectified AC supply.
Input voltage range and dropout headroom
Maximum input is 35 V. The dropout voltage is 2 V max at 1 A load.
Built-in protection — the part that survives a short
Overcurrent, overtemperature, and short-circuit protection are all on-chip. The thermal shutdown cycles the regulator if the junction hits the limit — the part gets hot, shuts off, cools down, and restarts. On a repair bench, that's the signature of a 78xx that's still alive after a downstream fault. The scorch mark on the board tells you something else died, not the regulator.
Active lifecycle — no LTB planning needed
No last-time-buy notice, no end-of-life risk for current production runs. The TO-220-3 package is a standard footprint that's been in the catalog for decades — no surprise obsolescence coming.