Identify this Sot-23-5 Linear Regulator
cannot name the manufacturer, however on my Pro Micros and Minis (all "counterfeit Chinese knockoffs" which I would rephrase as "inexpensive and reliable open source providers from China) the regulators are labeled S2PC, S80C, S80D (micros) and S8PL (mini), all with the same manufacturer symbol.  I have tested the dropout voltage and measured 240 mV at 65 mA load.