0
Why don't we use germanium as a control device in silicon control rectifier?
Wiki User
∙ 10y ago
Generally SCR is used at high power applications, in order to withstand the temperature dissipated in the SCR, THERMAL STABILITY is very high enough. It means that thermal stability of silicon is very high compared to germanium that's why germanium is not preferred. But that does not mean it is not possible, in fact before silicon became common in the 1960s devices equivalent to the SCR were built using germanium!
Wiki User
∙ 7y ago
Lanchana Lanchu
Wiki User
∙ 9y agoGenerally silicone controlled rectifiers are used at high power applications in order to withstand the temperature dissipated across the scr. Germanium is not preferred because its thermal stability is not very high.
Wiki User
∙ 10y agoActually in the late 1950s and early 1960s when germanium was the dominate semiconductor, devices similar to the SCR were made with germanium. They were called thyristors, similar to the gas filled tube the thyratron. However as germanium can only operate up to junction temperatures of about 60C and silicon can operate up to junction temperatures of 150C, it is much easier to make high power SCRs than thyristors. Also germanium devices must be packaged in expensive hermetically sealed metal cans, silicon devices can be packaged in inexpensive plastic.
Add your answer:
Earn +20 pts
Why Silicon Controlled Rectifier is called current controlled device?
Because it is controlled by the gate current
What is represented by 'A' in 'OA79' diode?
The symbol 'A' indicates that this device is made from germanium . as you may know germanium has less cut in voltage so this device is used for low power signal or for signal processing. also the leakage current or reverse saturation current of germanium is greater than silicon.
Difference between silicon-controlled rectifier and diode?
silicon controlled rectifier is a 3 terminal 4 layer device which has 2 consecutive P N junctions here the three terminals called anode, cathode and gate gate controls the conduction of the scr but diode just conducts in forward bias and blocks in reverse bias
Which is the device that converts AC to DC?
A Rectifier converts Alternating current into Direct current
What is semi controlled rectifier?
such a control rectifier that control or rectifier single phase. for that purpose we used SCR that is called single phase controlled rectifier.
What is SCR Give its application?
scr is a silicon control rectifier used to control the rectifing voltage.. its a bidirectional device can use it for both the directions......
What are the advantages of a silicon-controlled rectifier?
SILICON CONTROLLED RECTIFIER APPLICATIONS i) Speed control for motors ii) Temperature control for electric hot plate iii) Dimmer switch for domestic lighting iv) Dimmer control for stage lighting.
Why Silicon Controlled Rectifier is called current controlled device?
Because it is controlled by the gate current
I am researching germanium and i would like to know what can you find it in?
You can find Germanium inside transistors. Note. Most transistors today are made from Silicon. In order to find a Germanium transistor you can read the type no. off the device, then look in a data book. Alternatively, if you have the equipment, measure Vcesat for the device. Silicon devices show about 1.2 V. When you find one at about 0.6 V you've got your Germanium.
Why silicon prefer to germiniuam?
Four reasons. First, it is a LOT cheaper and easier to get silicon. Germanium is a trace element in rocks. You need to mine and process lots of rock to get any germanium. Silicon is also known as sand--very easy to find. Second, germanium is heat sensitive. It's harder to solder a germanium device in than a silicon one because the heat can mess up the germanium. Germanium devices pretty much have to be soldered in by hand because you have to heat sink them, whereas silicon devices can be soldered in a soldering machine. Third, germanium's hazardous and silicon is generally not. People eat off glass plates, which are made from silicon. They do NOT eat from germanium plates, if they could even afford them. And fourth, germanium has a variable voltage drop--the higher the voltage, the greater the drop. If you pump 5000 volts into a silicon diode, you're going to get 4999.3v out the other side.
When an scr turns on it acts like a?
An SCR, a silicon-controlled rectifier, is a four-layer solid state current controlling device. When it turns on it acts like an electronic switch and rectifier.
What is represented by 'A' in 'OA79' diode?
The symbol 'A' indicates that this device is made from germanium . as you may know germanium has less cut in voltage so this device is used for low power signal or for signal processing. also the leakage current or reverse saturation current of germanium is greater than silicon.
Difference between silicon-controlled rectifier and diode?
silicon controlled rectifier is a 3 terminal 4 layer device which has 2 consecutive P N junctions here the three terminals called anode, cathode and gate gate controls the conduction of the scr but diode just conducts in forward bias and blocks in reverse bias
What is a silicon-controlled rectifier?
A silicon-controlled rectifier is a semiconductor device that is used as a switch in an electrical circuit. It's a solid state direct current (DC) electronic switch. There is a ton of information including a detailed description of the SCR and a list of applications at the Wikipedia article. A link is posted below.
Why Silicon transistor are preferred to germanium transistors?
)silicon has got less leakage current 2)high threshold voltage (to avoid unwanted triggering of the device from noise) 3)more adhesive to aluminum
What device is also called a rectifier?
A rectifier is an electronic device that changes an AC voltage to a DC voltage.
Why SCR cannot be used as bidirectional device?
A SCR's (Silicon Controller Rectifier) name hints at the answer. As a rectifier (diode) current can only pass in one direction. There are devices at can pass in both directions, and typically they are a pair of SCR's wired in opposite polarity.
