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Questions tagged [reverse-breakdown]

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1
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1answer
41 views

HFA3096 transistor array breakdown voltage

In the book Learning the Art of Electronics, one of the labs is to build a differential amplifier with a CA3096 transistor array. The author admits that the chip may be difficult to find and gives the ...
1
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2answers
54 views

what limits the maximum voltage of this optocoupler (6N137)?

In the datasheet it is stated that the maximum VCC voltage is +5.5V.(https://www.vishay.com/docs/84732/6n137.pdf) Because ive been told to question everything (and i have enought of them to kill one ...
0
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0answers
30 views

How to find the resistance of a diode operating in reverse breakdown region?

I am tasked to find the small signal resistance of a diode operating in reverse breakdown region (not forward bias). Method 1: Is using the small signal resistance formula correct even in the ...
2
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2answers
79 views

Find cause of diode destruction from destroyed diode itself

Is it possible to find the cause of power diode destruction, ie. if it was destroyed through: reverse overvoltage spike (reverse breakdown and subsequent thermal destruction due to reverse ...
-1
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1answer
250 views

Led blinking with one NPN transistor [duplicate]

I am using scheme as shown below to blink an LED. But I'm using 9V battery source instead of 12V. I tried to use capacitors in range 100uF - 500uF to increase delay between blinks. Questions: ...
0
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2answers
132 views

How to solve a a full wave rectifier with two diodes and a ground in the middle?

This is the problem I am trying to follow along with the solution but I don't understand what is happening, how do I handle the random ground in the middle?? is the node between d1 and d2 40Vpeek and ...
1
vote
2answers
116 views

Can a reverse biased diode be driven past its voltage rating but with current limited to few uA

If, for example, a Silicon diode rated at 100V is reverse biased at 200V (long term, not just very briefly) but in series with a few MegaOhm resistor such that the reverse current is limited to one ...
0
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1answer
108 views

huge reverse current leakage in fast recovery diode for boost converter

i have a boost converter circuit that will boost 12V to around 180V, the circuit is works pretty good but there is huge reverse current in fast recovery diode right before the load, here my circuit ...
49
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5answers
11k views

Are LEDs better than we think?

Conventional wisdom about LEDs says their maximum reverse voltage \$V_{R(max)}\$ is quite limited, usually in the 5V-8V range. So, for experimentation purposes, I wanted to bring an LED into ...
0
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3answers
474 views

diode selection for large current reverse bias, small current forward bias

I'm designing a circuit where I want to pass a small test current from one leg, but block a large "firing" current (rocketry) coming from another leg in reverse bias. I have a 5vdc indicator line (...
2
votes
1answer
295 views

How do zener diodes, silicon diodes, and base-emitter junctions differ in reverse breakdown mode?

Here's datasheets for all of the above, and what reverse breakdown-related information I gather from them: Nexperia BZV55-B10 10V zener diode Breakdown may damage the device for powers above 400mW, ...
1
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2answers
1k views

PC817 input features

I'm designing a new circuit and I need to know if PC817 allows AC voltage input around 230V. I've tried with DC Voltage but never AC Voltage. Does anyone know if it operates with AC input?
6
votes
1answer
830 views

Are reverse biased transistors stable?

The usual circuit (found widely across the internet) for a true random number generator's (TRNG) entropy source is a reverse biased transistor like so:- Q1 is typically a 2N3904 as it has been found ...
2
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3answers
3k views

maximum reverse voltage applied to a resistor-LED configuration

Consider the simple circuit below: simulate this circuit – Schematic created using CircuitLab LED datasheet: link Does the applying of a reversed 36 volts to this circuit damage the LED? ...
2
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0answers
2k views

Diode emission coefficient and saturation current

I have created a Zener diode model in LTSpice, and now I am trying to simulate it with different values of the saturation current (IS), emission coefficient (N) and breakdown voltage (BV) using Spice. ...
2
votes
1answer
205 views

Protect phototransistor from emitter-collector breakdown

I'm using the ADC on the reset pin on an ATTiny85 to detect an IR level. The reset pin is disabled in the fuses but I would like the ability to "recover" the fuses and reprogram the device. The ...