I found a few super low drop out (LDO) for SBEC 5V power supply linear regulators. Once I verify functionality, I will share part numbers. Next, I need to figure out the 5V regulator used in the SMEC, The good news is the 5V linear supplies in the SMEC and SBEC seem to be very solid. So far I have not found a faulty one. The 8 V DC-DC supply on the SBEC is known to burn up, I have several that have burnt through the PCB.