diode damage [question]

[No one]

diode damage

Hello Everyone;
What happens if a diode be damaged? Short circuited? Open circuited? etc.?

 

[yjkwon57]

If a diode is damaged electrically, sometimes it will be either short-circuited due to junction melt-down or open-circuited due to bonding wire fused off. In the latter case, some explosion might occur, thus, to prevent the danger, some flame-proof test is to be performed.

 

[Kral]

No one,
According to the document "Failure Mode, Effects, and Criticality Analysis (FMECA)" published by RIAC (formerly RAC), the distribution for a general purpose diode is as follows:
. Short 49%
. Open 36%
. Parameter Change 15%
The distribution for a rectifier diode is:
. Short 51%
. Open 29%
. Parameter Change 20%
The distribution for a small signal diode is:
. Short 18%
. Open 24%
. Parameter Change 58%
.
According to the document MIL-HDBK-338-1A "Electronic Reliability Design Handbook", the distributions are as follows:
. Short Circuits 75%
. Intermittent Circuits 18%
. Open Circuits 6%
I use the RAC document, because its database is newer.
The MIL-HDBK-338-1A can be downloaded for free. It is large (about 2" thick, double sided. The RIAC document is not free. I think it costs about $40 US.
Regards,
Kral

 

[nguyennam]

Both Kral and yjkwon57 are right, one with literature, one with experience.

I myself from my experience agree that there are 3 types of dead diodes:
- short circuit (most common)
- open circuit,
- unstable parameter: voltage drop, reverse current, diode noise, ... change suddenly or intermittently. However, this type of dead diode is rare, and often happens to the low-quality diodes.

nguyennam

 

[No one]

Hello Everyone;
Can anyone, please, upload related free document or email it for me?

 

[sam khan]

diod is short

 

[Kral]

No one,
All non-classified military documents, including MIL-HDBK-338-1A, may be obtained at
. h**p://assist.daps.dla.mil/
The site was down at 9:00 EDT. If you are not succesful, keep trying
Regards,
Kral

 

[Electronica]

basically it burns out

 

[Kral]

The phrase "burns out" is too vague for circuit analysis from a safety point of view. The effects of a diode shorting are quite different from the effects of a diode opening up.
Regards,
Kral