Electronics Forum: capacitance (Page 1 of 8)

X5R dielectric aging

Electronics Forum | Mon Jun 01 22:56:39 EDT 2009 | davef

Reflow soldering de-ages the capacitors. Two things may be affecting your testing. * Capacitance measurements are often erratic during testing for about 10 hours after de-aging. * Test limits should be set so that the capacitance value is within the

Embedded Capacitance

Electronics Forum | Fri Apr 03 02:10:30 EDT 2009 | Adam

Thanks Dave Adam

Embedded Capacitance

Electronics Forum | Fri Mar 20 04:28:08 EDT 2009 | milas

Hi Does anyone have any experience with assembling pcbs that have embedded capacitance ? are there any do's and dont's over and above manufacturing a standard mulit-layer pcb ? Tahks inadvance Milas

MLCC crack detection

Electronics Forum | Mon Sep 06 04:42:18 EDT 2004 | KenF

Thx for the replies. Acutally I am doing a process related study to see whether the process (pcb depanelling)can induce crack to an MLCC. After depanelling, I will do a thermal shock on the MLCC based on IEC 384-1, that is, five cycles of 30min at hi

Stray Capacitance

Electronics Forum | Wed Oct 04 11:36:06 EDT 2006 | flipit

Hi, Anyone ever have an issue with stray capacitance when using no clean solder paste. We are having a timing problem on one product. The problem goes away when we clean the assemblies. We use a no clean process normally. These assemblies worked

QFN (9x9) Thermal Capacitance Model

Electronics Forum | Tue Dec 28 03:54:50 EST 2010 | riscy00

Hi Has anyone has thermal capacitance model for QFN (9x9) package with exposed pad 7 x 7 (or 6 x 6). Ideally between junction and case, junction case and board (JESD51-7 or similar). I wish to do transient with spice, to established how long it tak

Film cap losing capacitance?

Electronics Forum | Wed Sep 23 07:51:28 EDT 2015 | kkay

We have been experiencing an issue where our Panasonic film caps on a board are losing their rated capacitance. We are well within their recommended reflow specs and no other operation exposes the part to a temp of more than 160°C. The caps will read

Buried Capacitance In PWB

Electronics Forum | Wed Aug 18 15:56:20 EDT 1999 | david dougherty

Hadco offers a technology of building in a "buried" capacitance layer (& other embedded passives) in organic PWBs (FR4 for example). see http://www.hadco.com/prod03.htm and a design manual is posted here: http://www.hadco.com/pdfs/bcguide.pdf I am c

X7R woes

Electronics Forum | Mon Dec 26 13:24:12 EST 2005 | mariss

I'm assuming the fracture in tension; the fracture doesn't show even at X50. The broken edges are that clean. I would expect spalling at the fracture edges if it were a compression or torsional fracture. This makes me belive the board expands and pul

Wrong Crystal

Electronics Forum | Tue Nov 26 12:20:39 EST 2019 | rossrohrer1

I ordered a capacitor book. I reinstalled the crystal that i purchased from digikey, and swapped the two load capacitors out from 30pf to 10PF which works out well with the datasheet that calls for 10pf Load Capacitance, and this equation (CL = (C1

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