Sunday 3 July 2016

Identification question - tiny SCR & colorful Zener?



Update: The transistor with 3D marking is really an NPN, not a PNP.


I found the exact model at https://www.google.com/search?q=pnp+3d+transistor&tbm=isch&source=univ&sa=X&ved=2ahUKEwiYyZ3bhfrfAhUTh7wKHe3MC-wQsAR6BAgEEAE&biw=1046&bih=501#imgrc=rq_3nUYyqfy3_M:


Datasheet here: http://www.secosgmbh.com/datasheet/products/SSMPTransistor/SOT-23/MMBTA44.pdf


1



Please help identify these parts:


PCB photo


Is that back thing on the upper left an SCR? What kind of SCR? It's so tiny and has 3 D written on it. I assume the terminal left of it is the anode, and the top terminal on right is the cathode, and the bottom terminal the gate? Or is it not an SCR?


In lower colorful diodes. Are these Zener diodes? Where is the cathode of the one in blue? Why is the glass fat and in blue?


Thanks.




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