What is a Small Signal Diode?
A small signal diode is a small non-linear semiconductor which is often used in electronic circuits where high frequencies or small currents are involved in television, radio and digital logic circuits. Small signal diodes are smaller in size compared to regular power diodes. The PN junction of a small signal diode is usually encapsulated in glass in order to protect it and generally has a black or red band at one end of its body identifying it as the cathode end of the terminal. Small signal diodes have lower current and power ratings in comparison to rectifier diodes but can function better in high frequency applications or in switching and clipping applications which deal with short-duration pulse waveforms.
Applications for Small Signal Diodes:
As previously mentioned, small signal diodes are often used in high frequency applications or in switching and clipping applications which deal with short-duration pulse waveforms. Small signal diodes are also found as a switch in rectifiers, snubbers, limiters, and wave-shaping circuits. Yet another application for small signal diodes is to create a regulated voltage supply where diodes are connected together in series in order to provide a constant DC voltage across the diode combination.
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