Electronics Forum | Mon Jul 16 07:33:34 EDT 2012 | amitsindwani
Why to use 5% color spot in HIC if level 2a-5a are considered bad when 10% is NOT blue ? 10% will be NOT blue(or pink) only after 5% is pink. Then why to keep 5% in HIC ?
Electronics Forum | Mon Jul 16 15:47:52 EDT 2012 | davef
Here's what Desco says ... Humidity Indicator Card (HIC) A card on which a moisture-sensitive chemical is printed such that it will change color from blue to pink when the indicated relative humidity is exceeded. This is packed inside the moisture-se
Electronics Forum | Sat Nov 25 18:45:19 EST 2000 | Ashok Dhawan
I am getting black spots / stuff while I run gold finish PCB through reflow soldering process using NC solder paste.The affected spots have intermetalic as black in color. Does not solder very well. I did look at the archieve but could not find info
Electronics Forum | Mon Jul 16 16:37:29 EDT 2012 | kjs123p
Why to use 5% color spot in HIC if level 2a-5a > are considered bad when 10% is NOT blue ? 10% > will be NOT blue(or pink) only after 5% is pink. > Then why to keep 5% in HIC ? We change out the HIC and dessicant when the 5% turns pink to try to
Electronics Forum | Tue Jul 17 00:10:32 EDT 2012 | amitsindwani
Referring to IPC/JEDEC J-STD-033B.1 section 3.3.2.2 'The amount of desiccant used, per moisture barrier bag, shall be based on the bag surface area and WVTR in order to limit the interior relative humidity in the MBB to less than 10% at 25°C.' So wha
Electronics Forum | Mon Jul 23 08:35:33 EDT 2012 | grahamcooper22
The lower the RH in the MBB the better for all moisture sensitive devices. Maintaining less then 5% will mean no parts of between 2a-5a MSL will need drying before use. The calculation uses 10% because it is a sensible amount of desiccant to use base
Electronics Forum | Tue Oct 29 03:29:23 EDT 2019 | ramesh_10377
hi with reference to below thread Nickel pad for spot welding on PCB i have a similar requirement. Plese help me to resolve. regards Ramesh.S
Electronics Forum | Mon Nov 27 17:31:34 EST 2000 | Dave F
Send the boards back the fabricator and have another set made by someone else.
Electronics Forum | Tue Nov 28 21:07:44 EST 2000 | Alvin K
Gold is porous and spots on gold plated PCBs is one of the drawbacks of using gold as a solderability protector. Base Nickel exposure seems to be the cause of this and is aggravated when the gold thickness is less than what it should be. I agree with
Electronics Forum | Sat Oct 01 15:51:54 EDT 2016 | mnikhilesh
I have seen a small nickel pad (probably) soldered on PCB which is used to spot weld the other nickel strip coming from battery. I have seen them in chinese protection boards. I need to know how and where I can find them? Is there any technical name
