@pks64, Sorry but you haven't identified what Tutorial you are referring to. If you want to simulate a BS139 then there's already a model in the Spice Symbol library as I have already  pointed out to you in your previous post here: [https://easyeda.com/forum/topic/missing-model-value-d9cd27faa86c4bf19b9cf177673a5b92](https://easyeda.com/forum/topic/missing-model-value-d9cd27faa86c4bf19b9cf177673a5b92)

The video I was referring to is here: [https://www.youtube.com/watch?v=TYhSQhkVWUE](https://www.youtube.com/watch?v=TYhSQhkVWUE)<br> <br> Many thanks, Paul

For definitive information about simulation in EasyEDA, please read the Simulation Tutorial,  (3) in (2) in the forum topic marked as [Must read]: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a)

@pks64, The video you linkd to is confusing because it refers to "simulation data" when it means "spice model". Simulation data are the outputs from a simulation run not the models that are used in it. Especially from discrete devices, you cannot easily derive a spice model from a datasheet. This is explained in Chapter 14 of the EasyEDA Simulation Tutorial at: [https://docs.easyeda.com/en/Simulation/Headings/index.html](https://docs.easyeda.com/en/Simulation/Headings/index.html) There are tools to extract source parameters from device datasheets but most are commercial products. Exceptions to this are some of the tools in the SuperSpice freeware package and Simon Bramble's tool for creating LTspice VDMOS models. Many of the models built by signality.co.uk for EasyEDA for more complex devices, ranging from thyristors, op amps and CMOS logic devices, are so-called behavioural models which are built from datasheet parameters but this technique does not work well for simple discrete devices like transistors and diodes.