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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.
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. Electron flow is the reverse of conventional current flow. [2] [3] [4]
The DO-35 (also known as DO-204-AH or SOD27) is a semiconductor package used to encapsulate signal diodes (i.e., diodes meant to handle small amounts of current and voltage). [10] [13] [2] It is often used to package small signal, low power diodes such as 1N4148 (a 100 V, 300 mA silicon diode.)
The 1N4148 and 1N914 are not the same. The reverse current of the 1N4148 is much lower that is why it replaced the 1N914. The 1N914 is speced at 5 microamps reverse current, the 1N4148 25 nanoamps. Other than that, they are basically identical. The reverse recovery time of both is 4 nanosecond, not very fast these days.
Log amp simulated with 1kΩ resistor and 1N4148 diode at 25°C (blue) and 50°C (purple). The difference (red) varies around 50mV. The diode's saturation current doubles for every ten kelvin rise in temperature and varies significantly due to process variation.
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