Ads
related to: zener diode replacementebay.com has been visited by 1M+ users in the past month
Search results
Results from the WOW.Com Content Network
A Zener diode is a special type of diode designed to reliably allow current to flow "backwards" (inverted polarity) when a certain set reverse voltage, known as the Zener voltage, is reached. Zener diodes are manufactured with a great variety of Zener voltages and some are even variable.
Three 1N4148 diodes in glass DO-35 axial package. The black band on the right is the cathode side. Diode schematic symbol vs cathode marking on the package. The 1N4148 is a standard silicon switching signal diode. It is one of the most popular and long-lived switching diodes because of its dependable specifications and low cost.
The maximum sustained, regulated voltage may not exceed 36 V; the maximum cathode-anode voltage is limited to 37 V. [26] Historically, TL431 was designed and manufactured with this application in mind, and was advertised as an "extremely attractive replacement for high cost, temperature-compensated zeners". [27]
Electrically, these devices resemble Zener diodes, with the following major differences: They rely on gas ionization, rather than Zener breakdown; The unregulated supply voltage must be 15–20% above the nominal output voltage to ensure that the discharge starts; The output can be higher than nominal if the current through the tube is too low.
Various semiconductor diodes. Left: A four-diode bridge rectifier.Next to it is a 1N4148 signal diode.On the far right is a Zener diode.In most diodes, a white or black painted band identifies the cathode into which electrons will flow when the diode is conducting.
[dubious – discuss] This feature provides better surge protection than a simple Zener diode and acts more like a gas-discharge tube replacement. Avalanche diodes have a small positive temperature coefficient of voltage, whereas diodes relying on the Zener effect have a negative temperature coefficient. [2] [dubious – discuss]
Ads
related to: zener diode replacementebay.com has been visited by 1M+ users in the past month