Pat,
Sorry for not getting back to you sooner.
Here's my suggestion on your problem. I would contact Nat. Semicon. about
their LM158AH/883 low power dual op-amp in a TO-5 package, and ask them what
ESD classification (rating) is the unit. ESD classification, based on Human
Body Model (ESD STMS5.1-1998) is as follows:
Class 0 < 250 Volts (Most Sensitive)
Class 1A 250 - 500 Volts
Class 1B 500 - 1,000 Volts
Class 1C 1,000 - 2,000 Volts
Class 2 2,000 - 4,000 Volts
Class 3A 4,000 - 8,000 Volts
Class 3B > 8,000 Volts (Least Sensitive)
The lower the class, the more sensitive the device.
Within your facility, suggest that you have your operators grounded when
handling the device. If the device is a class 0 device, you will have to
have ESD table mats, and ionizers present since class 0 devices could fail
just by looking at them (I learned that the hard way). If these devices are
prevalent in the shop, you may want to consider wearing ESD smocks around
them as well.
You're right when you indicate that precautions should be taken. The biggest
problem with ESD is that you never know if you're damaging the component
until it fails and an autopsy (failure analysis) is performed on the board
and device.
Good Luck.
Lee Whiteman
Senior Manufacturing Engineer
ACI / EMPF
Telephone: (610) 362-1200; Ext. 208
FAX: (610) 362-1290
E-Mail: [log in to unmask] <mailto:[log in to unmask]>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Pat Diamond
> Sent: Tuesday, August 01, 2000 11:44 AM
> To: [log in to unmask]
> Subject: [TN] Static protection
>
>
> Hi everyone,
>
> I have a question regarding static damage (or not) to bi-polar devices.
>
> At present within one of our sites we hand assemble pcb's using no form of
> static protection, I am told by the design authority that because the only
> active device fitted is bi-polar, no protection is required - the
> device in
> question is a Nat. Semicon. LM158AH/883 low power dual op-amp in a TO-5
> package. I feel that precautions should still be taken, can anyone offer
> some advice?
>
> Regards,
>
> Pat Diamond
> Weston Aerospace
>
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