IV curve of a BD-5 tunnel diode

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Discussion Overview

The discussion revolves around the search for the IV curve of a General Electric BD-5 tunnel diode. Participants explore the availability of existing data, the possibility of creating the curve through measurements, and share personal experiences related to similar tasks.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • Jack inquires about the availability of the IV curve for the BD-5 tunnel diode, expressing difficulty in finding detailed datasheets.
  • Berkeman suggests a link to a report that includes a sketch of the curve and offers access to a curve tracer, but Jack indicates it lacks the detail he needs.
  • Jack mentions borrowing a Keithley SourceMeter to measure the IV curve himself, indicating a preference for obtaining precise data through personal experimentation.
  • Another participant shares a personal anecdote about creating IV curves for zener diodes without a curve tracer, highlighting alternative methods for obtaining such data.
  • Jack later provides rough IV plots of two BD-5 diodes and a BD-4 diode, measured at room temperature, while noting the variability among diodes and potential measurement inaccuracies.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the availability of the IV curve data, with some suggesting alternative methods for obtaining it while others share personal experiences. The discussion remains unresolved regarding the best approach to acquire accurate IV curve data.

Contextual Notes

Jack's measurements are based on his own data collection, and he acknowledges the variability in diode performance, which may affect the reliability of the provided plots.

jack b
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Hi All

Anyone know where I might find the IV curve for a General Electric BD-5 tunnel diode? I have found a few short datasheets for the BD series, but I really need a curve.

Does anyone know where to find such a thing? Or should I just get the SourceMeter out and make one myself.

Thanks
Jack
 
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jack b said:
Hi All

Anyone know where I might find the IV curve for a General Electric BD-5 tunnel diode? I have found a few short datasheets for the BD series, but I really need a curve.

Does anyone know where to find such a thing? Or should I just get the SourceMeter out and make one myself.

Thanks
Jack

I googled BD-5 tunnel diode, and got some hits. Here's one with a sketch of the curve:

http://www.phys.ufl.edu/REU/1999/reports/tyner/tyner.htm

from a report on some research.

It may be the most effective like you say to just sweep out the curve yourself. If you're in Silicon Valley, I have a curve tracer next to my lab bench that I could let you use...
 
Hi Berkeman

Sorry for the delay in replying, I ended up traveling home for christmas, so no internet.

Cheers for looking, but that doesn't really have the detail I need. And I'm a few thousand miles too far east to take up your generous offer to lend a curve tracer. I managed to borrow a good Keithley SourceMeter, so I'll just do the measurements back at the lab.

Thanks anyway
Jack
 
Side note: One of my first assignments at my work was sweep out the I-V curves for several zener diodes. We didn't have a curve tracer readily available, so I had to build a test jig using only a power supply and a resistor.
 
EDIT: OK, so I was replying to a post pushing some curvefitting software, which got deleted as spam, but I'll leave my post here as the info may be useful.
====================================================

Ignoring the fact that this thread has been dead for months, and the fact that a lorentzian fit to a badly-sketched curve without any values on it would be about as much use as a water soluble lifeboat, I do now have some useful data.

For anyone who's interested I did take appropriate data back in February. I thought I'd make it available to anyone who's searching the web for it.
I've attatched rough IV plots of two BD5 diodes and a BD4 diode, measured with a sourcemeter at room temperature. Usual disclamers apply (not all the diodes are the same, for all you know I'm incompetent etc. etc.)

Cheers
Jack
 

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