10V fixed rail with 1V max dropout at 500mA
The LM2937ES-10/NOPB is a 10V fixed-output LDO regulator from Texas Instruments, delivering up to 500mA. Its maximum dropout voltage of 1V at full load means the input must stay above 11V to maintain regulation — critical for headroom in 12V or 15V intermediate rails. The protection set — over-temperature, short-circuit, transient voltage, and mirror-image insertion — reduces the need for external clamp diodes or crowbar circuits on the output.
Dropout headroom and quiescent current trade-off
With a 10mA quiescent current and 20mA supply maximum, the LM2937ES-10/NOPB draws a fixed overhead regardless of load — acceptable for always-on rails but less efficient than a low-Iq LDO for battery-powered designs. The fixed 10V output eliminates external resistor dividers, saving two components and a feedback-node noise path. Compared to the adjustable LM1085IS-ADJ/NOPB, this part offers a simpler BOM for a fixed 10V rail, though the LM1085 can deliver 3A for higher-current needs.
Active production — no obsolescence signal
Texas Instruments continues to manufacture this part, and it is ROHS3 compliant. Sourced to order against BOM quantities; confirm the tube quantity for your line — typical tube count for TO-263 is 45 or 50 pieces per tube, but verify with the order desk.
TO-263-4 (D2PAK) footprint and thermal pad
Surface-mount assembly with standard reflow profile; the tab solder joint is critical for both electrical connection and thermal dissipation.