5V rail, 1.5A capability — what this LDO delivers
The STMicroelectronics L4940D2T5-TR is a fixed 5V, 1.5A positive linear regulator in a D2PAK (TO-263-3) surface-mount package. It is designed for applications requiring a clean, regulated 5V rail from an unregulated DC supply up to 17V — typical in automotive ECUs, industrial control boards, and post-regulator stages in multi-rail power supplies. PSRR is 68 dB at 120 Hz, a relevant figure for rejecting rectified mains ripple in industrial power supplies. The part includes over-temperature, reverse polarity, and short-circuit protection, reducing the need for external protection diodes and crowbar circuits.
No last-time-buy or obsolescence risk is indicated.