KCC Quizzes AQQ303 about the radius of a circle
1. Quote of the month: "When I die, I want to die like my grandfather who died peacefully in his sleep. Not screaming like all the passengers in his car" - Will Rogers
2. Quiz AQQ304 about finding the radius of a circle
Good luck, and try to be
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August Monthly Blog Quiz! Read the blog, take the quiz, and you could win a gift card
Important: Read the blog first . The quiz questions are all based on the content of the blog:
Stay in the loop and win! Read the blog Current Output Driving Industrial Loops , then take our quick five-question quiz for a chance to win a gift card
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| SLA Status | Assignee | Support Status |
|---|---|---|
| SLA Closed. | Open | |
The data sheet shows wildly different Current Gain (beta / Hfe) for the two packages (SOIC and QFN), Is this accurate?
SOIC shows a typical 1mA Hfe = 600
QFN shows a typical 1mA Hfe = 1,800
Are there different dies in each package? What causes this extreme difference in what otherwise should be an identical part, irrespective of package.
Hello Driz,
Sorry for the long delay. It took a while to track this down.
As it turns out the part was first released in the SOIC package and then five years later it was released in the QFN package. So the two parts are not built from the same die at all. They are different dies and there was most likely a silicon process update that had been made during the five years of time. So the die is different and there must be some process changes that in turn caused the hFe to be drastically different.
I hope this helps.
Thanks for asking!
Dave T
Hello Driz,
Sorry for the long delay. It took a while to track this down.
As it turns out the part was first released in the SOIC package and then five years later it was released in the QFN package. So the two parts are not built from the same die at all. They are different dies and there was most likely a silicon process update that had been made during the five years of time. So the die is different and there must be some process changes that in turn caused the hFe to be drastically different.
I hope this helps.
Thanks for asking!
Dave T
