Electronics Forum: 25c (Page 1 of 4)

BGA Installation with IR unsolder

Electronics Forum | Mon May 19 08:18:22 EDT 2008 | davef

You should set the temperature at liquidus point of the solder used on the BGA plus 20 to 25*C. So, for tin-lead that would be ~215*C. Most lead-free solders run about ~20 to 25*C higher than that.

Lead-free profile for big electrolytic cap

Electronics Forum | Mon Sep 10 09:29:52 EDT 2007 | guqing

About 25C difference between the cap joint and the small ICs.

SPC / Control Charts etc

Electronics Forum | Fri May 10 17:50:25 EDT 2002 | davef

We chart the following: * Reflow: Time over liquidous +25�C * Wave: Contact time and track tin, copper, gold, and antimony in pot analysis.

Uneven thermal load in PCB design.

Electronics Forum | Tue Dec 17 18:37:18 EST 2002 | davef

As a starting point, consider that these component leads may not be getting hot enough. Measure the temperature profile on the leads that do not solder well to be sure: * Heating and cooling ramps are within the paste supplier's recommendations. * C

Solder paste to room temperature.

Electronics Forum | Wed Apr 20 11:08:05 EDT 2005 | py

usual solder cream has a viscosity above 800 000pas at 25�C for each 1�C the viscosity change about 30 000 pas at 15�C you will have nothing ( 37% of viscosity less)on your board...

Soak Test

Electronics Forum | Tue Sep 13 06:00:29 EDT 2005 | Charlie

Was it possible to calculate Soak Test Equivalent on PCBA? For example: Soak Test at 60C/80%RH equivalent to how many hour of test at 25C/60%RH ?

profile ramp starts in??

Electronics Forum | Mon Feb 20 17:11:13 EST 2006 | pjc

From ambient, about 25C, that's to peak overall to about 230C. Dave's got the link to the SMQ 230 sheet.

Ionic - MIL-P-28809A vs IPC TM650 (2.3.25C)

Electronics Forum | Thu Nov 20 04:00:36 EST 2008 | caerleon

Our sub-contractors will be using SMD600. Thankyou all for your replies much appriciated.

Heller 1800S oven profile changing

Electronics Forum | Tue Mar 27 15:12:49 EDT 2018 | dph150

the first and last zones heat up just fine the middle just cools down. The only way I can get it to start up again is to open the oven and let it cool down to room temp. about 25C. says heaters are on oven not ready.

dendritic growth

Electronics Forum | Tue Dec 14 09:53:03 EST 2004 | paul_fisher

Yep fully functional and failed during the test. 25 to 55C in 3 hour hold for 9 hours then 55C to 25C in 3 hours hold for 9 hours then repeat. Humidity at 95 percent! Boards only part conformally coated. Growth with and without the coating. seems to

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