Fixed 12V rail, 3A continuous, TO-220-3
The Texas Instruments LM1085IT-12/NOPB is a fixed 12V output linear regulator delivering up to 3A continuous current in the industry-standard TO-220-3 through-hole package. The 60dB power supply rejection ratio at 120 Hz means this regulator attenuates 120 Hz ripple from a full-wave rectified input by a factor of 1000, making it suitable for powering sensitive analog stages like preamplifiers or ADC reference buffers.
Thermal and protection envelope
Built-in over-current and over-temperature protection let the regulator survive a sustained short on the output or a thermal runaway condition without external crowbar circuitry — the part folds back and recovers when the fault clears. The 10 mA quiescent current is the regulator's own draw from the input rail regardless of load; in a system that idles at low current, this Iq dominates the standby budget and should be factored into the input supply sizing.
ROHS3 compliant, which covers the full ten restricted substances including the four phthalates; this satisfies EU and most global regulatory requirements without an exemption letter.