Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Reverse current of zener diode at 125degC?

"Usually" that data is found in characterization data for the device. The fact
its not speced means it either is not reliable for spec sheet, eg. a part of
test procedure that could predict what performance would be or its simply
a parameter with bounds so great not worth repeating. Or given testing it
hot, there are simple methods to do that, test time too great a cost burden.

Contact production EE responsible for device, or rel department, to see if
they can lend any comment.


Regards, Dana.
 
ON Semi who make Fairchild's diodes use the same spec as Philips with 3 uA @ Vr=2V but do not spec any voltages below Vr=1 on any Zener as they diverge quite a lot in impedance and leakage for different voltages. Ref

1716851770591.png


A different ON Semi diode spec BZX84C4V7ET1 shows a dramatic difference leakage ratios below 5V Zeners for 150'C/25'C
There seems to be variations in fabrication and specs for low Vz diodes but in any case, your guess is as good as mine if there are no specs.

1716852126147.png
REF
 
Hi,



here the negative temperature coefficient of zener diodes with a zener voltage below 5V will contribute, see https://toshiba.semicon-storage.com...nsiderations-for-the-temperature-coeffic.html

BR
Toshiba states the two types of breakdown : Avalanche & Zener. and that all Avalanche mode is PTC due to lower mobility.
Also, Zener types below 5V switch from PTC to NTC and Zener leakage exponentially increases with lower Vz and rises more 1st order effects with rising temp.(when Vz<5V)

Yet this unspecified quantity is unknown in the NExperia spce for (Leakage @ 125'C at 2.5V) which has a much lower leakage (3uA) at 25'C than Rohm.(10uA)

This only raises uncertainty about the unspecified quantity of leakage ratio of 125'C/25'C due to doping differences between manufacturers until more evidence is provided.

If the NTC leakage ratio is more important than the 25'C max. leakage, then one might choose Rohm's product or improve the design to tolerate both.

Note sale of mfg rights: NXP =2017> Nexperia =2024> Vishay.
 

LaTeX Commands Quick-Menu:

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top