[sdiy] Pet Peeves

[Donald Tillman]

> On May 4, 2018, at 10:54 AM, Tim Ressel <timr at circuitabbey.com> wrote:
> 
> Who's up for a Friday rant?
> 
> My pet peeve this morning: incomplete data sheets. I'm looking at the Lite-On LTP-3862 and nowhere does it relate the segment names on the pins to the segments on the display.

Okay, sure...  My current pet peeve is horribly incorrect SPICE models.

Here's the Fairchild data sheet for the hugely popular 2N3904 transistor:

    http://www.mit.edu/~6.301/2N3904f.pdf

The SPICE model is included at the bottom of page 2.  The value for Ise, the B-E leakage saturation current, is off by 13 orders of magnitude.  (!!!)

Also, one should be highly skeptical of SPICE models with parameters with 4 or more digits of precision.

  -- Don
--
Donald Tillman, Palo Alto, California
http://www.till.com

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