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deronmoped
Joined: 03 Nov 2006
Posts: 1154
Location: San Diego
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| Posted: Fri Oct 07, 2016 4:04 pm Post subject: Electronic parts life. |
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Now if you had two parts, one NOS and one being used, would the NOS last much longer? I know caps are the main issue, and heat and loading will degrade all the parts, but how fast will caps fail from just old age? I have some old radios, tube and transistor that are sixty plus years old and still working on original parts, what is the deal there?
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Oct 07, 2016 5:44 pm Post subject: |
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Not an issue with transistors or resistors. Those fail due to excessive current and heat. Sitting on a shelf, they'll be fine.
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Fri Oct 07, 2016 6:17 pm Post subject: |
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Actually, though it's a very slow process, semiconductors can fail just sitting on the shelf due to the process of diffusion of the N and P dopants thru the silicon substrate. This happens more rapidly at higher temperatures.
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sat Oct 08, 2016 3:25 am Post subject: |
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| cmjohnson wrote: | | Actually, though it's a very slow process, semiconductors can fail just sitting on the shelf due to the process of diffusion of the N and P dopants thru the silicon substrate. This happens more rapidly at higher temperatures. |
Enough!
CM claims to be a humble technician.
Only an engineer would know this stuff.
So fess up! LOL
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deronmoped
Joined: 03 Nov 2006
Posts: 1154
Location: San Diego
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| Posted: Sat Oct 08, 2016 5:57 am Post subject: |
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| cmjohnson wrote: | | Actually, though it's a very slow process, semiconductors can fail just sitting on the shelf due to the process of diffusion of the N and P dopants thru the silicon substrate. This happens more rapidly at higher temperatures. |
What are we talking, years or decades for semiconductors.
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Sat Oct 08, 2016 12:17 pm Post subject: |
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Decades, unless you run the chips very hot. Like, hot enough to lose your fingerprints if you touch them.
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