<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On May 4, 2018, at 10:54 AM, Tim Ressel <<a href="mailto:timr@circuitabbey.com" class="">timr@circuitabbey.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Who's up for a Friday rant?<br class=""><br class="">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.<br class=""></div></div></blockquote><div><br class=""></div><div>Okay, sure... My current pet peeve is horribly incorrect SPICE models.</div><div><br class=""></div><div>Here's the Fairchild data sheet for the hugely popular 2N3904 transistor:</div><div><br class=""></div><div> <a href="http://www.mit.edu/~6.301/2N3904f.pdf" class="">http://www.mit.edu/~6.301/2N3904f.pdf</a></div><div><br class=""></div><div>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. (!!!)</div><div><br class=""></div><div>Also, one should be highly skeptical of SPICE models with parameters with 4 or more digits of precision.</div></div><div class=""><div style="color: rgb(0, 0, 0); font-family: Menlo; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"><br class=""> -- Don<br class="">--<br class="">Donald Tillman, Palo Alto, California<br class=""><a href="http://www.till.com" class="">http://www.till.com</a></div>
</div>
<br class=""></body></html>