LED simulation Miscellaneous Questions

[Marcus54]

Is it normal for a red LED to have a forward voltage of 2.2 volts?

Thank you

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[Andrew Larkin]

An actual red LED will have a forward voltage of between 1.9 and 2.2V.

Different colour LEDs will have different voltages at their nominated current - depending on their construction and the manufacturer.

As a generality:
Red, Yellow, Amber, and Yellow-Green are around 2V
True Green, Blue, white, and violet/UV are around 3.3V
Infrared is about 1.2V

I'll leave the Labcenter people to address the rest of your questions.

[Marcus54]

I pulled out a component tester, measured to start with a recent LED, and then tested a few old LEDs
1. Red = 1.95V
2. Yellow = 1.98V
3. Green = 2.65V
4. Blue = 2.8V
5. White = 2.8V
6. UV=3.12V
Some very old LEDs
1. IR= 1.14
2. Red 1.6V
3. Orange = 1.8V
4. Green 1.9V
On proteus, the voltages are the same 2.23V

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[Ettore]

As Andrew said, the forward voltage depends by the LED colour and manufacturer as well.
Because the LED simulation model is a generic one we specify a nominal forward voltage of 2.2V and currect of 10mA.

You can, however, edit those values by clicking right on the LED and select "Edit Properties" from the context window.
In the dialogue Edit Component you can then modify both forward Voltage and Current values from the datasheet specification of the given real part.

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