Negative rail regulator for industrial and analog supplies
The STMicroelectronics L7912ACD2T-TR is a fixed -12 V output linear regulator delivering up to 1.5 A. It is a negative-voltage complement to the 78xx positive regulator family.
Dropout and load — sizing the input rail
The maximum dropout voltage is 1.1 V at 1 A output. The 3 mA quiescent current is negligible in most designs but should be included in the thermal budget for the input rectifier. The 1.5 A output rating is the absolute maximum.
Protection features reduce external component count
Built-in over-temperature and short-circuit protection mean the L7912ACD2T-TR can survive an output short or thermal overload without external crowbar or foldback circuits. This simplifies the BOM for point-of-load negative rails in motor drives and industrial PSUs where fault conditions are expected.
Sourcing an obsolete -12 V regulator
The L7912ACD2T-TR is listed as obsolete by STMicroelectronics. No official successor is recorded in the available lifecycle data.