Morning, All, I need a quick and general answer to the question "What typically is the temperture at which components come apart/melt?" My boss asked me how the use of high melting point (221 deg C) solder would affect components in the CR Oven, and all I could give him was a fudge answer about thermal profiles and how even MIL spec devices (rated at 125 deg C) survive 215 deg C+ during soldering with 63/37 solder. Does anyone have an idea of the rough temperature at which Industrial grade (-40 to +85 deg C) platic-bodied components fry, and how long it takes to fry them at that temperature? I had a look through randomly selected component data sheets, but none of them contained this useful bit of information. They state that if the maximum case temperature is sustained for an unspecified time, it could affect the performance and/or reliability of the device, but they advice was totally non-specific about exactly how much for how long. I experienced using a component once that had to be manually soldered because it kept falling apart internally whenever it went near a soldering machine, so I'm cautious about giving uninformed replies. I'm trying to solder 35 x 35 mm PBGA's (318 and 388 pins) to an FR4 board with a finish of 4.5 microinches gold over 150 microinches of Nickel. HMP solder has been recommended, but the temperature that the boards are exposed to during soldering goes up by 35 deg C over normal. Your advice, stories, etc. much appreciated. Pete Duncan --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------