Victor,
From a practical point of view, that would be quite difficult. The actual internal gas volume of these devices is very, very small.
I'm not sure I would believe any number I got.
As a next level up, one could do a dye penetrant test.
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor G. Hernandez
Sent: Thursday, October 11, 2007 9:45 AM
To: [log in to unmask]
Subject: Re: [TN] Cracks in the body of glass diodes (JANTX1N4148UR1)
Did you conduct a hermetic Test?
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Thursday, October 11, 2007 7:38 AM
To: [log in to unmask]
Subject: Re: [TN] Cracks in the body of glass diodes (JANTX1N4148UR1)
Good Morning Juan!
I have your pictures posted. They are here:
http://stevezeva.homestead.com/files/JTX1N4148_UR1_003.jpg
http://stevezeva.homestead.com/files/JANTX1N4148_UR1_004.jpg
http://stevezeva.homestead.com/files/JANTX1N4148_UR1_001.jpg
I'm with Inge on this one. These cracks are in the body, not good. There is something I have noticed in two of the pictures, UR1_004 and UR_001, is that the glass seems discolored right next to the termination, which to me indicates that they may have been thermally shocked.
Do you know where these diodes were purchased from? Brokers maybe? Maybe salvaged off some boards? Poorly pre-tinned to restore solderability?
I wouldn't use them...
Steve Gregory
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Juan T. Marugán
Sent: Thursday, October 11, 2007 5:25 AM
To: [log in to unmask]
Subject: [TN] Cracks in the body of glass diodes (JANTX1N4148UR1)
Good Morning,
In a certain number of SMD diodes we have detected what we consider as a crack in the glass body of the diode. This condition was already present in the diodes packaged in a reel, that is, before mounting in the PWAs.
What we cannot determine yet is if this condition could be acceptable. Could you help us through your valuable opinions?
PD: I have sent 3 photographs to Steve Gregory.
Thank you in advance.
Juan T. Marugán López
Indra Sistemas SA
Supply Chain Management (SCM)
Production Quality
C/ Joaquín Rodrigo 11
28300 Aranjuez - Madrid (SPAIN)
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