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The 1n4148 is a standard silicon switching signal diode Texas instruments listed their version of the device in an october 1966 data sheet Tj, junction temperature (oc) figure2 leakage current vs junction temperature

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 [2] the 1n4148 was registered at jedec in 1968 as a silicon switching signal diode for military and industrial applications 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. 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.

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 In reverse bias, a healthy 1n4148 should ideally show negligible current (only a very small reverse leakage current in the nanoampere range) A high reverse current reading indicates failure.

Reverse leakage current indicates the component's ability to block unwanted current Breakdown voltage is especially important for voltage regulation and protection components like zener diodes Temperature coefficient helps predict performance changes under different operating conditions.

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