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The 1n4148 is a standard silicon switching signal diode A high reverse current reading indicates failure. A typical 1n4148 diode has a reverse leakage of between 1 and 1.5gω (at 25°c) with a reverse voltage of 10v, and this is sufficient for most common applications.

Home » component data » diode (pn junction) data » this page 1n4148 diode data key data for the 1n4148 semiconductor diode including key electrical parameters, performance, features, outline, package type and many other key datasheet details In reverse bias, a healthy 1n4148 should ideally show negligible current (only a very small reverse leakage current in the nanoampere range) The 1n4148 is a widely used small signal diode in a leaded format

It is virtually identical to the 1n914 and is often used interchangeably with it.

The following circuit measures leakage current The 1n4148 is the 'test' item The brightness of the led will change from one 'test' item to another and is very low power A mechanical switch would go between the 9v battery and the power rail

Here is a plot of the current in d3 The current will be different for different devices being tested The diode current must also be looked at so as to. Tj, junction temperature (oc) figure2 leakage current vs junction temperature

The forward voltage drop tends to increase slightly with temperature and current, while the reverse leakage current increases more significantly at elevated temperatures

Functional differences 1n4148 vs zener diode Here's how you can tell if your 1n4148 has failed due to reverse bias Check for excessive reverse current Measure the reverse current using a multimeter

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