Ramon,
The typical gold plating thickness we see on RF power transistors is 0.000125 inches (i.e., 125u" or 3.175 microns). We haven't see any plating as thick as Ingemar indicated which I believe was 0.001000 inches (i.e., 1000u" or 25.4 microns). However we have seen some devices with 0.000500 inches (i.e., 500u" or 12.7 microns).
Regards,
George
George M. Wenger
Reliability / FMA Engineer
Base Station and Subsystems Group
Andrew Corporation, 40 Technology Drive, Warren, NJ 07059 (908) 546-4531 [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Dehoyos, Ramon
Sent: Thursday, April 14, 2005 10:51 AM
To: [log in to unmask]
Subject: Re: [TN] Tinning of Bipolar Transistor
Hi Ingemar:
What do you mean with a mil? One thousand of an inch or a millionth of an inch? My understanding has been the first one, which is what I think you mean. Some books abbreviate millionth of an inch as mil.
Regards,
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Ingemar Hernefjord
(KC/EMW)
Sent: Thursday, April 14, 2005 9:35 AM
To: [log in to unmask]
Subject: Re: [TN] Tinning of Bipolar Transistor
Steve,
warning: first of all, crossection one pc and have a look at the
gold thickness. We have a problem with degolding on a batch just now:
the ordinary dip-dip has to be prolonged because of too much gold. We
measured up to 1 mil of gold on some legs! And only a fraction of
that on another leg. Ideal is just a flash, if the nickel is good.
It's sometimes a problem to give correct plating to these tiny things.
In Chin...oops..
Ingemar Hernefjord
Ericsson Microwave Systems
Hi All!
We've got this Bipolar Microwave Transistor that I've just seen for
the first time, and I was asked if this part needs tinning because of
the gold plating.
I know what the J-STD says, but looking at the construction of the part,
I don't know if the part can withstand the heat of a tinning operation.
Take a look at "Bipolar Transistor" on my web page at:
http://www.stevezeva.homestead.com
I've tried to track down a datasheet, but can't seem to find one. The top
of the part is marked; "TRW 54601" and just below that, there's a "C86"
marked there.
The part may be very robust, and I have nothing to worry about. But
because this is the first time I've seen something like this, I thought I'd
ask the experts out there...
Kind regards,
-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
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