Hi Carey -
     
     SOT-23 - these little buggers are have been driving a great many folks 
     crazy almost as bad as leadless chip carriers! We have experienced 
     some problems with reflow soldering this component type but after some 
     investigation we found that we had a flux/thermal interaction problem. 
     Because the SOT-23's pads were connected to several internal board 
     layers they were slow to heat up and we were not getting good flux 
     activation during the reflow cycle. We solved the problem by slowing 
     down the conveyor to allow for a better preheat soak. If you do slow 
     down your conveyor speed be careful not slow down too much and 
     overheat the flux (i.e. burn it off) or you will experience problems 
     too. Good Luck.
     
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]
     


______________________________ Reply Separator _________________________________
Subject: Soldering Profiles
Author:  [log in to unmask] at ccmgw1
Date:    1/22/97 9:35 PM


     
     
     
     
We are experiencing problems with a Hewlett Packard PIN diode component 
during wave soldering
The HP part is a HSMP-3810 in low profile SOT-23 package (marking EOL) If 
the component is Hand soldered it performs to it's specifications. If it is 
IR re-flowed the part suffers form a performance degradation (not complete 
failure)
HP has refused ( is either unwilling or unable) to provide a preferred 
soldering profile for this part
Has one experienced this problem with other low profile SOT-23 type device, 
or knows of a IR profile that can be safely used with this part.
     
Regards
     
Carey Ritchey
     
     
*************************************************************************** 
* TechNet mail list is provided as a service by IPC using SmartList v3.05 * 
*************************************************************************** 
* To unsubscribe from this list at any time, send a message to:           * 
* [log in to unmask] with <subject: unsubscribe> and no text.        * 
*************************************************************************** 
* If you are having a problem with the IPC TechNet forum please contact   * 
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      * 
***************************************************************************
     

***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to:           *
* [log in to unmask] with <subject: unsubscribe> and no text.        *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact   *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      *
***************************************************************************