Diode FAQs:

Q: Is a diode a two-terminal electronic component that conducts primarily in one direction?

A: Yes, it has low resistance to the current in one direction, and high resistance in the other.

Q: Are diodes intended to sense light , so they are packaged in materials that allow light to pass, and are usually PIN?

A: Yes, A photodiode can be used in solar cells, in photometry, or in optical communications.

Q: Are diodes constructed from a metal to semiconductor contact?

A: Yes.

Q: Is a diode said to be in the storage-phase?

A: Yes.

Q: Are diodes majority carrier devices and so do not suffer from minority carrier storage problems that slow down many other diodes—so they have a faster reverse recovery than p–n junction diodes?

A: Yes.

Q: Are diodes sensitive to more energetic radiation?

A: Yes.

Q: Are diodes forms of rectifiers?

A: Yes.

Q: Are diodes connected in series and opposite directions to balance the temperature coefficient response of the diodes to near-zero?

A: Yes.

Q: Was a diode the demodulation of amplitude modulated radio broadcasts?

A: Yes.

Q: Are diodes commonly used in optical storage devices and for high speed optical communication?

A: Yes.

Q: Are diodes used to regulate voltage , to protect circuits from high voltage surges , to electronically tune radio and TV receivers , to generate radio-frequency oscillations , and to produce light?

A: Yes, Tunnel, Gunn and IMPATT diodes exhibit negative resistance, which is useful in microwave and switching circuits.

Q: Is a diode a thermionic-valve device , consisting of a sealed evacuated glass envelope containing two electrodes: a cathode heated by a filament, and a plate?

A: Yes, Early examples were fairly similar in appearance to incandescent light bulbs.

Q: Are diodes also used in power electronics?

A: Yes, as their central layer can withstand high voltages.

Q: Is a diode said to be "turned on" as it has been given an external forward bias?

A: Yes.

Q: Are diodes frequently used to conduct damaging high voltages away from sensitive electronic devices?

A: Yes.

Q: Are diodes usually referred to as D for diode on PCBs?

A: Yes.

Q: Are diodes also used in Cockcroft–Walton voltage multipliers to convert AC into higher DC voltages?

A: Yes.

Q: Is a diode drift , diffusion, and thermal recombination–generation?

A: Yes, It also assumes that the R–G current in the depletion region is insignificant.

Q: Were diodes also called crystal diodes and found application in the earliest radios called crystal radio receivers?

A: Yes.

Q: Is a diode made of a crystal of semiconductor?

A: Yes, and usually silicon, but germanium and gallium arsenide are also used.

Q: Are diodes used in motor controller and relay circuits to de-energize coils rapidly without the damaging voltage spikes that would otherwise occur?

A: Yes.

Q: Are diodes designed to break down at a well-defined reverse voltage without being destroyed?

A: Yes.

Q: Is a diode to allow an electric current to pass in one direction , while blocking current in the opposite direction?

A: Yes, Thus, the diode can be viewed as an electronic version of a check valve.

Q: Were diodes the first semiconductor electronic devices?

A: Yes.

Q: Are diodes also used in electronic musical keyboards?

A: Yes.

Q: Are diodes generally obsolete?

A: Yes, but may be available from a few manufacturers.

Q: Is a diode reverse biased?

A: Yes.

Q: Is a diode deliberately designed for use in that manner?

A: Yes.

Q: Is a diode used to prevent the higher-charge battery from discharging through the lower-charge battery when the alternator is not running?

A: Yes.

Q: Are diodes very fast?

A: Yes, and may be used at low temperatures, high magnetic fields, and in high radiation environments.

Q: Were diodes developed separately?

A: Yes, and at approximately the same time, in the early 1900s, as radio receiver detectors.

Q: Were diodes used in analog signal applications and as rectifiers in DC power supplies in consumer electronics such as radios?

A: Yes, and televisions, and sound systems.

Q: Is a diode colloquially applied to several types of breakdown diodes?

A: Yes, but strictly speaking Zener diodes have a breakdown voltage of below 5 volts, whilst avalanche diodes are used for breakdown voltages above that value.

Q: Are diodes faster than other p–n diodes?

A: Yes, They also have less reverse-current leakage than Schottky diodes. A typical example is the 1N914.

Q: Are diodes made of silicon?

A: Yes, but other semiconductors such as selenium and germanium are sometimes used.

Q: Were diodes used more frequently in radios because the early point-contact type semiconductor diodes were less stable?

A: Yes.

Q: Are diodes the p–n diodes found in CMOS integrated circuits?

A: Yes, and which include two diodes per pin and many other internal diodes.

Q: Are diodes rectifier diodes that incorporate the low forward voltage drop of the Schottky diode with the surge-handling capability and low reverse leakage current of a normal p–n junction diode?

A: Yes.

Q: Is a diode commonly said to have a forward "threshold" voltage?

A: Yes, and above which it conducts and below which conduction stops.