Last Buy — plan the BOM transition
Texas Instruments lists the LP2980IM5-3.8/NOPB with a Last Buy lifecycle status. That means the manufacturer has announced end-of-life and is accepting final orders within a defined window — after that, the part is no longer produced. For a procurement buyer filling a BOM line, this is the signal to secure the remaining lifetime buy quantity or qualify a drop-in replacement before the supply dries up.
3.8 V fixed output, 50 mA — what it powers
This is a single-output, fixed 3.8 V positive LDO regulator rated for 50 mA continuous output. The 0.22 V maximum dropout at 50 mA means it maintains regulation with only 220 mV headroom between input and output — useful when the input rail is a 3.8 V battery or a 5 V bus that sags under load. The 95 µA quiescent current keeps the battery drain low in always-on peripherals.
63 dB PSRR — noise rejection for analog rails
With 63 dB of power-supply rejection ratio at 1 kHz, this regulator attenuates ripple and switching noise from the input by a factor of roughly 1400. That makes it a fit for powering the analog supply pins of an op-amp, ADC, or sensor front-end where a noisy rail would couple into the signal path. The 16 V maximum input voltage gives headroom for unregulated supplies like a 12 V battery or a 9 V wall wart.
SOT-23-5 package — board layout notes
The LP2980IM5-3.8/NOPB comes in a SOT-23-5 (SC-74A) surface-mount package. The enable pin lets a microcontroller or system supervisor shut down the regulator, dropping the quiescent current to near zero in standby. The over-current, over-temperature, and short-circuit protection features are built in — no external watchdog needed.
The junction temperature limit is the same 125°C, so the output current must be derated if the ambient is near the ceiling and the power dissipation is high.