0
If you're looking for a definition, it's: the voltage at which, a diode can be considered a "short circuit" or low-value resistor
It varies with each diode, but most have approximately 0.6 or 0.7 Volts across them when you get almost 1mA flowing FORWARD through them. For light emitting diodes (LEDs), it varies between diodes and is largely dependent on the colour of the light. Green ones typically have 1.3V @ 1mA, red = 1.8V @ 1mA, and higher for other colours. Infrared LEDs usually have 1.1V @ 1mA. Higher cutoff voltages occur at higher forward currents, meaning that at 1mA, Vf might be 1.8V for a certain diode, but at 10mA Vf is maybe 1.9V.
One important side note is that reverse current is still possible, but is so small it's usually negligible. Also, it's not recommended to force current backwards through a diode (exception: Zener diodes) because it usually requires a higher voltage to accomplish this.
The cutoff voltage of a diode is the maximum voltage that the diode can withstand in the revers biase above which the device will be destroyed.
Wiki User
∙ 12y ago
Wiki User
∙ 14y agoThe cut off voltage of silicon diodes is typically 0.6V, depending on temperature.
Add your answer:
Earn +20 pts
In what region of their characteristic curve are zener diodes operated?
Zener diodes are normally operated in their reverse breakdown voltage curve.
Silicon diodes begin conducting at a forward voltage of approximately?
600mV
What are zenna diodes?
They are actually called zener and I think they limit the voltage of a circuit.
Why current flow from cathode to anode in zener diode?
First off, I don't know if by current flow you mean conventional current flow or electron current flow. You realize they are in opposite directions and most electronics engineers use conventional current flow in circuit analysis.Ignoring this, I will assume your real question is "Why does current flow backwards in zener diodes compared to ordinary diodes?" The answer is that zener diodes are not operated in the forward biased range as are ordinary diodes, instead they are operated in the reverse biased range. When reverse biased enough any diode reaches breakdown voltage and suddenly conducts. Most ordinary diodes can be destroyed by breakdown, but zener diodes are designed to tolerate it. In zener diodes, this breakdown is referred to as "zener breakdown" and the voltage it happens at the "zener voltage".Low voltage zener diodes can still be used in the forward biased mode, like ordinary diodes. However most high voltage zener diodes have a "blocking diode" that is not documented on the data sheet to block forward biased operation. "Blocking diodes" are simply ordinary diodes wired in series with the zener; when the zener would be forward biased they are reverse biased (and thus blocking current), when the zener would be reverse biased they are forward biased.
What is the maximum voltage across unbiased positive silicon diodes limiter during positive alternation of the input voltage?
0.7 V
What is the difference between series and parallel diodes?
Connecting diodes in series:Connecting diodes in series will increase the forward voltage of the resultant diode.Connecting diodes in series will cause an open circuit until peak inverse voltage (smallest diode) is applied on total resultant.Connecting diodes in parallel:Connecting diodes in parallel will increase the current carrying capacity of the diode.Connecting diodes in parallel will not get you a resultant diode conduction in both sides.
What is the value of the knee voltage and breakdown voltage of z?
It is about 0.7 volt for Silicon diodes.
Why an op-amp diode rectifier called as a precision rectifier?
In a rectifier made of just diodes, the diodes have a voltage drop, resulting in a lower DC output voltage. By introducing an Op-amp, this voltage drop can be overcome. Since there is no voltage drop caused by the diodes, the rectified signal is not changed by the rectifier, so it is called a precision rectifier.
What is 0.37v and 0.63v in RC circuit?
0.63 is the knee voltage & 0.37 is the cutoff voltage
Where are the alternator diodes on a 1994 Ford Taurus?
Unless things have changed, the diodes are part of the alternator. The voltage regulator is attached to the alternator but the diodes are part of the alternator.
In what region of their characteristic curve are zener diodes operated?
Zener diodes are normally operated in their reverse breakdown voltage curve.
Silicon diodes begin conducting at a forward voltage of approximately?
600mV
Do diodes other than LED's emmit light?
Yes ,laser diodes actually emmit light . All other diodes serve to block voltage ,or zenner diode to regulate.
What is the fastest kind of diode?
The step recovery diodes are the "fastest" in that, while they may take relatively a long time between when the external voltage becomes negative until they switch fully off, the reverse current stops much more abruptly than other diodes. The tunnel diodes and Gunn diodes are the "fastest" in that the time after the external voltage becomes negative to the time they switch off is shorter than other diodes. The Schottky diodes are the "next-fastest" in that the time after the external voltage becomes negative to the time they switch off is very short.
What are zenna diodes?
They are actually called zener and I think they limit the voltage of a circuit.
Does an alternator produce a c voltage?
Yes, and internal diodes convert it into dc.
What is the use of diodes in doubler voltage?
A: The purpose it to block the capacitor from discharging to the source
