5 V fixed LDO in a TO-220 — what it delivers
The LM2931AV50 is a 5 V fixed-output low-dropout regulator from ON Semiconductor, delivering up to 100 mA in a TO-220-3 through-hole package. It is a single positive-output LDO with a maximum input voltage of 26 V and a dropout voltage of 0.6 V at full load. The 75 dB PSRR at 120 Hz makes it a solid choice for cleaning up a rectified DC rail feeding noise-sensitive analog circuits — think instrumentation amplifiers, sensor front-ends, or reference supplies where line-frequency ripple needs suppressing.
ON Semiconductor has marked the LM2931AV50 as obsolete. For a production BOM, this means any future replenishment depends on existing inventory in the independent distribution channel.
Key parametrics for the BOM fit
The quiescent current is 1 mA typical, with a maximum supply current of 30 mA — relevant for always-on or battery-backed rails where standby draw matters. Protection features include current limit and thermal shutdown, so the part can handle brief overloads or a shorted output without immediate failure. The TO-220 package with its exposed metal tab can dissipate several watts with a heatsink — useful if the load is continuous near the 100 mA limit and the input-output differential is high.