12 V fixed rail with 1 A headroom
The Texas Instruments LM2940IMPX-12/NOPB is a positive fixed-output linear regulator delivering 12 V at up to 1 A from a maximum input of 26 V. The fixed 12 V output simplifies the BOM — no external resistor divider needed — and the 66 dB PSRR at 120 Hz gives reasonable line-frequency ripple rejection for powering analog circuits or sensor interfaces fed from a rectified supply.
Protection set reduces external clamp count
Built-in over-current, over-temperature, reverse polarity, and short-circuit protection mean this regulator can survive a miswired battery connection or a downstream short without external crowbar or series diode. In an automotive or battery-backed application, the reverse polarity protection alone saves a Schottky and its voltage drop — the 1 V dropout already eats into headroom, so avoiding an extra forward drop matters.
The suffix indicates the lead-free, ROHS-compliant variant; the base LM2940 family has broad distribution and multiple package options, so alternate sourcing within the family is straightforward if tape-and-reel or cut-tape quantities are needed.
The active status means supply is not constrained by an end-of-life window; the main variables are date-code spread and reel condition, which can be specified in the purchase order for lot-controlled builds.