please interpret this for me...

Status
Not open for further replies.
S

spyghost

New Member
hi,

i received my order online from ti. its placed in an antistatic bag (as usual) but this time, the bag is completely sealed and it has a red sticker which says:
NOTICE!! PARTS ARE SUBJECT TO MOISTURE ABSORPTION. TAKE CARE TO PREVENT DAMAGE WHEN VAPOR OR IR SOLDERING. BAKE PRIOR TO SOLDERING TO REDUCE THE CHANCE FOR DAMAGE...
Click to expand...
its actually a uln2803adwr (soic). is there a special way of soldering this stuff???? its the first time i encountered such a thing!
if the temperature is of concern, well the lowest temp in my place is 28°C and the highest temp is 37°C. right now temp falls between 30-37.

how will i be able to solder this thing? is there a special way of dealing with this??? :roll: :cry: :?:
 
My knowledge in this area is limited and dated however I recall several things.

I seem to remember that some fluxes absorbed water at an incredible rate and that they might release that water rapidly upon heating (during soldering. In a production situation that might result in a relatively high humidity.

Another recollection - some production operations include washing or rinsing of flux with hot water.
 
hmmm... you have mentioned it in a production environment.

does that mean i have nothing to worry about? since i would only be doing hobbyist stuff, which obviously is only done at home...

:roll: :roll: :roll:
 
spyghost said:
hmmm... you have mentioned it in a production environment.

does that mean i have nothing to worry about? since i would only be doing hobbyist stuff, which obviously is only done at home...
Click to expand...

Well it does say "TAKE CARE TO PREVENT DAMAGE WHEN VAPOR OR IR SOLDERING" - are you doing either of those?.
 
spyghost said:
hmmm... you have mentioned it in a production environment.

does that mean i have nothing to worry about? since i would only be doing hobbyist stuff, which obviously is only done at home...

:roll: :roll: :roll:
Click to expand...

This is TI's "CYA" method of saying that part has a very poor moisture sensitivity level (MSL) rating. And as such, when it sits on the shelf for a long time, the part will absorb moisture over time.

Then when you rapidly heat the part while soldering, the moisture violently escapes providing a new mode of operation - The rapid disassembly mode. i.e it cracks! ;-)

By baking the part prior, you "gently" allow the mosture to escape and then you'll be ready to put the rapid T-rise to it.
 
wait, wait, wait...

i don't get the baking thing, and the rapid heating process during soldering :shock: :roll:

does that mean i "cannot" solder it at home level??? how will i bake it? :roll:
 
spyghost said:
wait, wait, wait...

i don't get the baking thing, and the rapid heating process during soldering :shock: :roll:

does that mean i "cannot" solder it at home level??? how will i bake it? :roll:
Click to expand...

Did you read my previous post? - try reading it again!.
 
spyghost said:
wait, wait, wait...

i don't get the baking thing, and the rapid heating process during soldering :shock: :roll:

does that mean i "cannot" solder it at home level??? how will i bake it? :roll:
Click to expand...

Just take care.. you are probably not capable of generating such steep rates of temperature rise at home anyhow.
The warning is intended for production environments where there are systems that could potentially destroy the parts in this way.

I wouldn't worry about it..
 
ok, so at home level, its just an ordinary surface mount ic that needs to be soldered the "usual way"? am i right?
 
Hi,

if you're worried about it,
just leave it open somewhere warm overnight,
to make sure it dries out.

personally i wouldn't worry.

John
 
yup, had loads of ic's with same warning, no sweat.. Just warm it a bit, if your worried, I never bother, as I don't remove it from its packaging until its soldered in. Never had one fail yet. This is more inline with production assembly lines, where the IC's are more exposed to environment (not in little sealed bags

Steve
 
john1 said:
Hi,

if you're worried about it,
just leave it open somewhere warm overnight,
to make sure it dries out.

personally i wouldn't worry.

John
Click to expand...

can i place it under the sun for a few hours (its quite hot now in my country because its summer)???
 
Status
Not open for further replies.

Similar threads

U
  • Question
What type of sensor is this?
Replies
2
Views
841
JimB
J
  • Question
Table Digital Clock Design by little experienced me.
Replies
8
Views
1K
danadak
E
  • Question
Help with my project please
Replies
13
Views
3K
danadak
H
  • Question
I need advice for 12vdc resister for warmth
Replies
5
Views
689
Pommie
P
S
Reviving a Screen Print Dryer HELP Please
Replies
4
Views
2K
snccoulter
S
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…