Hi All
Does anyone have any experience of HC49 crystals failing test following
Reflow Soldering with a standard 183 Deg-C Eutectic solder paste (Sn62 Pb36
Ag2).
- The max temp found at crystal is 225 Deg-C;
- Over 200 Deg-C is approx. 53 Seconds;
- The crystal is over 200 Deg-C for 22 Secs longer than the component
datasheet;
- Pre-heat is ramping up at 1.8 Deg-C per second;
- Time to 140 Deg-C is to long by 47 Seconds;
The profile may have to be changed slightly, but any experience of
failing SMT crystals and failure modes would be appreciated as the
crystal spec apears to be very close to our profile parameters.
Thanks.
Regards,
Douglas I McCall,
PCB Manufacturing Engineer - Eastbourne,
BOC EDWARDS,
Marshall Road,
Eastbourne,
East Sussex,
BN22 9BA UK
Tel: +44 (0) 1323 501 147
Fax: +44 (0) 1323 509 824
mailto:[log in to unmask]
Regards,
Douglas I McCall,
PCB Manufacturing Engineer - Eastbourne,
BOC EDWARDS,
Marshall Road,
Eastbourne,
East Sussex,
BN22 9BA UK
Tel: +44 (0) 1323 501 147
Fax: +44 (0) 1323 509 824
mailto:[log in to unmask]
BOC Edwards is a part of BOC Limited
Registered Office: Chertsey Road, Windlesham, Surrey GU20 6HJ
Number 337663-English Register
Ultimate holding company: The BOC Group plc
_____________________________________________________________________
This e-mail has been scanned for viruses by MCI's Internet Managed Scanning Services - powered by MessageLabs. For further information visit http://www.mci.com
---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/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
-----------------------------------------------------
|
