What this adjustable LDO brings to the rail
The Texas Instruments LM1086IT-ADJ/NOPB is a positive adjustable low-dropout regulator in a TO-220-3 through-hole package, rated for 1.5 A continuous output. Its output adjusts from a 1.2 V minimum up to 15 V maximum, set by an external resistor divider. The 75 dB PSRR at 120 Hz makes it a strong candidate for cleaning up rectified line ripple in analog supplies — think instrumentation front-ends, audio rails, or post-switcher regulation where ripple rejection matters more than raw efficiency. Operating temperature spans -40°C to 125°C. Input voltage maxes at 29 V.
Dropout and load — sizing the headroom
The 1.5 V dropout at the full 1.5 A load sets the minimum input-to-output differential. Quiescent current runs 5 mA typical, with a 10 mA maximum supply current.
Package and mounting
Built-in over-current, over-temperature, and short-circuit protection cover the common fault modes. The TO-220-3 tab is the ground (output) plane; bolt it to a heatsink if the dissipation exceeds a few watts — the junction-to-case thermal path is designed for tab-mount cooling. Through-hole mounting means hand-assembly or wave-solder; no MSL concerns, no reflow profile to validate. Check the tab clearance if you're potting the board.
Lifecycle and sourcing — active, no LTB clock
ROHS3 compliant, no exemption drama.