I'm wondering if anyone can help identify this component, with top marking PJt.
It's a 6-pin package and it's connected to a phototransistor. The collector is connected to pin 6 and the emitter is connected to pin 5 via a 10 kΩ resistor. Pin 1 is gnd, pin 3 goes through a 330 Ω resistor into pin 2 then through a 2.6 kΩ to gnd. Pin 6 goes to a 10 kΩ resistor. Pin 5 goes through the diode to gnd.
I'm thinking it's a comparator to give a high/low output from the phototransistor, but I can't find any comparators with a similar pinout.