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Thread Tools | Display Modes |
01-15-2011, 12:06 PM
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#1 |
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Member
Join Date: Mar 2010
City & State: Dracut, MA USA
Posts: 96
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Zener diode test question
I have a surface mount zener diode and I want to make sure it is good/bad. I believe it may be shorted, but not sure. Here is the data sheet:
http://http://www.taitroncomponents.com/catalog/Datasheet/TZT2.0W.pdf The diode is part number: TZT7.5YW When testing resistance across pins 1-3... I get 21 ohms... Max Zener Impedence is listed as 23... does this mean I'm ok? Or am I grossly misunderstanding this? Thanks for any and all help |
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01-15-2011, 01:41 PM
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#2 | |
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On my level
Join Date: Jul 2010
City & State: Bucharest
My Country: Romania
Line Voltage: 230VAC 50Hz
I'm a: Student Tech
Posts: 3,340
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Re: Zener diode test question
So it's a 7.5 volt. Remove it from the board and hook it up to a 12v power supply with a 1k resistor in series. Resistor goes from cathode (pin 3 in this case) to +12v, anode goes to ground. If you don't get 7.5 volts across the diode in this arrangement then it is bad.
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01-16-2011, 04:41 AM
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#3 |
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Member
Join Date: Mar 2010
City & State: Dracut, MA USA
Posts: 96
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Re: Zener diode test question
Thanks, I'll give that a try... if I can dig up a power supply.
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01-16-2011, 07:38 AM
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#4 |
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Member
Join Date: Mar 2010
City & State: Dracut, MA USA
Posts: 96
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Re: Zener diode test question
.2V, it's bad... thanks for the help.
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01-16-2011, 09:18 AM
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#5 |
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On my level
Join Date: Jul 2010
City & State: Bucharest
My Country: Romania
Line Voltage: 230VAC 50Hz
I'm a: Student Tech
Posts: 3,340
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Re: Zener diode test question
.2v is consistent with your 21 ohm resistance reading (apply voltage divider rule). It's bad alright.
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01-16-2011, 12:27 PM
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#6 |
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Member
Join Date: Mar 2010
City & State: Dracut, MA USA
Posts: 96
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Re: Zener diode test question
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01-16-2011, 01:11 PM
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#7 |
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On my level
Join Date: Jul 2010
City & State: Bucharest
My Country: Romania
Line Voltage: 230VAC 50Hz
I'm a: Student Tech
Posts: 3,340
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Re: Zener diode test question
Yup, will do.
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01-16-2011, 01:17 PM
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#8 |
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Member
Join Date: Mar 2010
City & State: Dracut, MA USA
Posts: 96
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Re: Zener diode test question
Thanks... I thought so, just ordered.
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01-26-2011, 03:29 PM
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#9 |
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Member
Join Date: Mar 2010
City & State: Dracut, MA USA
Posts: 96
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Re: Zener diode test question
Worked perfect, thanks!
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