Hi guys. Now I started soldering the circuit with LP2985AIM5-2.5 / NOPB. But I saw the key and markings on the back. I think the key should identify the first pin of the microcircuit. But here he seems to designate the first contact as the fifth. And also the numbers 666 or 999 began to confuse me. I studied the datasheet, but it says nothing about it. Who faced this? Help me please!