Bright White LEDs that are Static Sensitive!!!

[Brad Petria]

Hi,
Once I ordered some bright white LEDs from Jameco, which
were not static sensitive (no warning notice). I ordered another
type, N-94C6256, from another source and they came in a static
shielding bag with a warning!!!!! There is no information about
these. Why are these LEDs static sensitive?

Thanks in advance, Brad

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http://www.simtel.net/pub/pd/52792.html (info or download)

 

[Jim Yanik]

bpetria@verizon.net (Brad Petria) wrote in
news:40129483.11282034@news.bellatlantic.net:

Hi,
Once I ordered some bright white LEDs from Jameco, which
were not static sensitive (no warning notice). I ordered another
type, N-94C6256, from another source and they came in a static
shielding bag with a warning!!!!! There is no information about
these. Why are these LEDs static sensitive?

Thanks in advance, Brad

Actually,LED's being semiconductor devices,they SHOULD be shipped in anti-
static packaging. They're no different than any other diode.

Think about -how- static discharge damages semiconductor junctions.
Or recall the model for static discharge;the voltage and joules contained
in a single spike.

--
Jim Yanik
jyanik-at-kua.net

 

[Jim shedden]

Once I ordered some bright white LEDs from Jameco, which
were not static sensitive (no warning notice). I ordered another
type, N-94C6256, from another source and they came in a static
shielding bag with a warning!!!!!

Hi Brad,

It is best to treat all semiconductors as static sensitive and it's a
good habit to form. I work for a government contractor and we can't go
near anything without following static preventative procedures that we
are tested and certified on yearly. At home I can't be quite as
aggressive about it. I'm not going to install special flooring or wear
a smock, but I do use a wrist strap, anti-static mat, and anti-static
soldering and desoldering tools.

Regards,
Jim

 

[Andre]

james.shedden@baesystems.com (Jim shedden) wrote in message news:<b2bb7a22.0401241351.48fcbd8@posting.google.com>...

Once I ordered some bright white LEDs from Jameco, which
were not static sensitive (no warning notice). I ordered another
type, N-94C6256, from another source and they came in a static
shielding bag with a warning!!!!!

Hi Brad,

It is best to treat all semiconductors as static sensitive and it's a
good habit to form. I work for a government contractor and we can't go
near anything without following static preventative procedures that we
are tested and certified on yearly. At home I can't be quite as
aggressive about it. I'm not going to install special flooring or wear
a smock, but I do use a wrist strap, anti-static mat, and anti-static
soldering and desoldering tools.

Yup, I had a few white LEDs get toasted for no apparent reason.

Regards,
Jim

 

[Jim Yanik]

bpetria@verizon.net (Brad Petria) wrote in
news:40129483.11282034@news.bellatlantic.net:

Hi,
Once I ordered some bright white LEDs from Jameco, which
were not static sensitive (no warning notice). I ordered another
type, N-94C6256, from another source and they came in a static
shielding bag with a warning!!!!! There is no information about
these. Why are these LEDs static sensitive?

Thanks in advance, Brad

Because they are semiconductor devices;they have a junction that can be
damaged by overvoltage just like any other diode.

FYI,static charges can vary from 30 volts to several *thousand* volts,with
high instantaneous currents.That's how they destroy semis.

LEDs are just diodes with low reverse breakdown V.

Static discharges can weaken semis,and cause failure days,months
later,too,not just immediately.



--
Jim Yanik
jyanik-at-kua.net