1N400x Breakdown Voltage

Discussion in 'General Electronics Chat' started by tracecom, Nov 18, 2011.

  1. tracecom

    Thread Starter AAC Fanatic!

    Apr 16, 2010
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    In the attached 1N4001-1N4007 datasheet, the breakdown voltage (Vzk) is not listed. Am I correct to infer from Figure 4 that Vzk is approximately 120-130% of the Rated Peak Reverse Voltage?

    Thanks.
     
  2. crutschow

    Expert

    Mar 14, 2008
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    Vzk is likely not tested and thus not given in the data sheet. Normally you should never operate the diode above its Rated Peak Reverse Voltage. Are you planning on operating it above that?
     
  3. tracecom

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    Apr 16, 2010
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    No. It's purely an effort on my part to understand breakdown voltage in the context of p-n junctions.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
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    If you hit the actual breakdown voltage, you'll most likely kill the diode(s), as they aren't avalanche rated.
     
  5. tracecom

    Thread Starter AAC Fanatic!

    Apr 16, 2010
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    But I still want to understand what Figure 4 is telling me. Doesn't it indicate a sudden increase in reverse current at approximately 125% of Vrrm, and isn't that what breakdown voltage is? Or am I misunderstanding something?
     
  6. crutschow

    Expert

    Mar 14, 2008
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    Yes, that increase in current shown is the start of the avalanche breakdown. But there likely is a significant unit-to-unit difference in that voltage between different production diodes.
     
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