Electronics Forum: 1a33 deg c (Page 3 of 44)

Electronic Assemblies Manufactuirng - Bake-out ramp rate

Electronics Forum | Tue Jan 30 01:06:51 EST 2018 | dgassier81

Hi, In our shop we've always baked out PCBs and moisture sensitive parts prior to electronic assembly using a gentle ramp rate of 2 degC/minutes going hot (93degC) and same ramp rate going cold (back to room temp). We're trying to outsource that pro

When do you use Tin/Lead/Silver paste ?

Electronics Forum | Wed Feb 20 13:16:06 EST 2002 | pjc

Paste w/ 2% silver has a eutectic temp of 179deg.C vs. 183deg.C for std. 63/37. The 2% can give better wetting in some applications.

Moisture absorbtion in circuit boards

Electronics Forum | Mon May 27 18:59:24 EDT 2002 | Armynski

Carol, That time is also acceptable (2 Hrs @ 125 deg C) u can use this too... 6 Hrs @ 75 deg. C regards, Dreamy

SMT LED functional failure

Electronics Forum | Wed Apr 16 20:22:13 EDT 2003 | praveen

Hi, I have taken the profile.The peak temp. at the lead terminal is 219 degc, duration above MP 54 sec and duration 125 deg C-160 deg C is 60 sec.

TCE mismatch

Electronics Forum | Wed Feb 07 18:40:39 EST 2007 | bill

What is an acceptable mismatch for smt components and pcb. We are having cracked solder joints from fatigue after repeated thermal cycling 25 deg. c to 125 deg.c.

Solder Joint Discolouration

Electronics Forum | Fri Jan 04 08:02:03 EST 2019 | ameenullakhan

Hi, Thanks for the valuable feedback. We are at lower spec : ( TAL )Reflow time : Around 50 Sec ( Above 217 deg C) Peak Temp : 240- 245 deg C. Any other suspects. And your English is fine :) Regards, Ameen

microphoe low sensitivity

Electronics Forum | Wed Oct 14 01:17:40 EDT 2020 | SMTA-64386317

Data sheet allows of 250 DegC peak temperature and we are using below 240 DegC but still seeing high fal out. Manufacturer diagnose as BE charges loss due to heat. Hence, looking for anything extra could be done to minimize this defect. There is no w

Teflon Vs Fibreglass

Electronics Forum | Thu Apr 25 04:22:14 EDT 2002 | ianchan

We have an internal debate whether to calibrate equipment using K-type thermocouple made out of : 1) fibreglass braided, with a 482 deg-C peak-measurement properties? 2) teflon FEP(fluorinated Ethylene Proplene), with 204 deg-C peak-measurement p

environment Operational deg-C and RH% for Paste Printer

Electronics Forum | Thu Jun 06 02:27:43 EDT 2002 | ianchan

Hi mates, does anyone know if there is a industrial standard spec for environment(deg-C, RH%) operational use of Paste Printer machines? If there is no study to define a deg-C, RH% specs for immediate environemnt operation use of a paste printer ma

Quad ZCR 941 and Lead Free?

Electronics Forum | Mon Jun 20 10:59:18 EDT 2005 | Jason Fullerton

Extra cooling is better (Alpha recommends -3 to -7 degC/sec) for cosmetics. Less chance of s o called 'cooling lines' that look similar to 'cold' tin-lead joints. (Seems a bit steep to me - I worry about the risk of cracking ceramic caps.) Might be

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