Hi Inge! Got your pictures up! Go to: http://www.stevezeva.homestead.com and look at "Too much gold 1", and "Too much gold 2"... Kind regards, -Steve Gregory- Senior Process Engineer LaBarge Incorporated Tulsa, Oklahoma (918) 459-2285 (918) 459-2350 FAX |---------+---------------------------------> | | "Ingemar Hernefjord | | | (KC/EMW)" | | | <ingemar.hernefjord@ER| | | ICSSON.COM> | | | Sent by: TechNet | | | <[log in to unmask]> | | | | | | | | | 04/15/2005 03:33 AM | | | Please respond to | | | TechNet E-Mail Forum; | | | Please respond to | | | "Ingemar Hernefjord | | | (KC/EMW)" | | | | |---------+---------------------------------> >--------------------------------------------------------------------------------------------------------------| | | | To: [log in to unmask] | | cc: | | Subject: Re: [TN] Tinning of Bipolar Transistor | >--------------------------------------------------------------------------------------------------------------| Hi Ramon, actually one thousand of an inch! Equal to 25 micrometers. When you measured on various spots of the legs, the gold varied from 1 to nearly 25 micrometers. I'll post two pics for Steve's crowded galleria, one showing the actual microwave device, the other a cross section of a leg with 10 micrometers of gold. The manufacturer of the hardware said, that it can be a problem to get an even layer of gold on such devices. Nonsense... Ingemar -----Original Message----- From: Dehoyos, Ramon [mailto:[log in to unmask]] Sent: den 14 april 2005 16:51 To: TechNet E-Mail Forum; Ingemar Hernefjord (KC/EMW) 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 __________________________________________________________________ This message may contain information that is privileged and confidential to LaBarge, Inc. It is for use only by the individual or entity named above. 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