Look in IPC-D-275. There is a section on fastening these kind of parts with over 3 grams. Section 4.1.8.2, I think is the section. Hope this helps! > ---------- > From: Donald Cole[SMTP:[log in to unmask]] > Sent: Thursday, December 10, 1998 1:33 PM > To: [log in to unmask] > Subject: [TN] Mechanical Fastening of "heavy" components > > Hi all, > I am wondering if anyone can help me out! I am trying to find any > reference to a specification which states when a component is of a > certain mass, it needs to be fastened to the PCB by other means than its > solder joints (i.e. adhesive or mechanical fastening). I know the old > MIL-STD-2000A specification did state that if a component is 0.25 ounce > (7.1 grams) or more per lead than it must be supported by approved means > to ensure joints are not relied upon for mechanical support. I am being > told that a similar clause exists in either the IPC (ANSI/J-STD-001B or > ANSI/IPC-A-610) standards or BellCore GR-78-CORE. I have search these > and cannot seem to find any reference to this. Am I missing something, > or does such a clause exist somewhere else? The specific case I have is > a DC-DC power converter which weighs 3 oz. (85 grams) and has 9 thru > hole leads (0.040" dia.). We currently work to Bellcore and IPC > specifications. Is there a requirement to fasten this power converter > to the PCB with screws? Any input would be greatly appreciated. > > Thanks > dc > > ################################################################ > TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC's web site (http://www.ipc.org) "On-Line Services" > section for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > ################################################################ > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################