Re: Warning: Multiple definitions of model ...
¿ªÔÆÌåÓýWhat you say about this is true, hFE does have significant statistical spreads, but the datasheet limits are probably set at 3 sigma (any outside this being rejected, being only a 0.3% loss). 3 sigma covers 99.7% of the total distribution, whereas 1 sigma covers 68%. 95% of the distribution is contained within 2 sigma, so you are very likely to get something not too far away from the typical (or nominal), and the chance of a random device being near the limit is vanishingly small.BTW, you should also search for "testjig", as it's more often used than "curve tracer". --
Regards, Tony On 10/07/2023 15:34, John Woodgate
wrote:
You put your device and its model into a curve-tracer .ASC and set it up to produce (if it will) the same curves as in the data sheet. Compare the results. You can find curve-tracer .ASCs by going to Files on the web site and Searching for 'curve tracer'. For a bipolar, I would start with collector current as a function of collector voltage with base current as parameter. But remember the large variation of current gain between samples, even for graded devices like BC847x. |
Tony Casey