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gunn diode is transfered electron device & PIN diode is semiconductor device

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Is the 2N5777 photo diode an APD or a pin diode?

The 2N5777 is a Darlington silicon NPN photo detector, or, if you prefer a photoDarlington. A link is provided to a bit of data on this device.


What types of diodes are used in high frequencies?

Two types used at microwave frequencies are gunn and PIN diodes.


What is punchthrough in PIN diode?

Punchthrough in a PIN diode refers to a condition where the applied reverse bias voltage becomes high enough to deplete the intrinsic region entirely, allowing carriers to "punch through" from the p-type to the n-type regions. This phenomenon can lead to an increase in current flow, potentially damaging the diode if the voltage exceeds its breakdown limits. Punchthrough is typically undesirable in applications where the diode is expected to operate normally in reverse bias, as it can affect the diode's performance and reliability.


Which type of diode used in bridge rectifier?

You can use most diodes for that purpose, and particularly silicon diodes. However, you should not use zener diodes and similar for rectification purposes. Otherwise, you will likely not get the intended result. If the voltage exceeds the avalanche voltage, then the zener diode will no longer rectify, but conduct the other way as well.


How do you determine the collector and emitter terminals of a phototransistor?

Answer: First you have to find the Base, with your millimeter set to diodes play around with the probes between the three pins until you get a reading between one pin to both the other two pins that pin will be your Base, if your red probe is on that pin then it is a NPN transistor, if it is the black probe then it is a PNP, there will be a slight difference in the reading, the pin with the smallest reading will be the Collector and the larger is the Emitter