Its the same typical appearance as a large area photodiode - at least that's a search term you can eliminate, or otherwise.Hello everyone,
I have few of these parts, and I have no idea what they are.
They look like oversize transistors (TO-18)
Writing on the side says SD7014, but I cannot find any datasheet for it.
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Microscope zoom.
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If its intended application was known - that might clear things up.My best guess is-- phototransistor is a light-sensitive transistor. A common type of phototransistor, called a photobipolar transistor, is in essence a bipolar transistor encased in a transparent case so that light can reach the base–collector junction.
The base pin (or the middle pin) is connected to the case.all the pins are there but the base pin isn't connected on some versions.
The first thing to do is use a DMM Ohms range to check for any path between the case pin and either of the other pins.The base pin (or the middle pin) is connected to the case.