1N4729A DATASHEET PDF

1NA datasheet, 1NA pdf, 1NA data sheet, datasheet, data sheet, pdf, BKC International Electronics, V, 1 W silicon zener diode. 1NA. 1NA. 1NA. 1NA. . This datasheet contains the design specifications for product develop- ment. Buy MULTICOMP 1NA online at Newark element 1NA – Zener Single Diode, V, 1 W, DO, Technical Datasheet: 1NA Datasheet.

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It’s like the Zener resistance isn’t decreasing as the current increases, which is not what I’d expect. Can you expand on the statement: Actually, it was a candidate for a regulated supply fed by a CCS.

There are a couple of issues here. Home Questions Tags Users Unanswered.

1NA Datasheet(PDF) – Diotech Company.

Because it rises as per the quote you must have an unstable power source of 5V and this is rising as you increase the load resistance. Buck8pe 8 What’s odd is that the BZX55C is showing more-or-less the same behaviour although with 1n479a resistors. How much current will th load require? The closer to the minimum input voltage the more difficult it will be to avoid large changes in current flowing through the TL As shown in the circuit below which models the behavior that you are seeing of a voltage reading of about 4V from the zener diode simulate this circuit — Schematic created using CircuitLab.

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Indeed it would seem to be a much easier solution to just get an adjustable LDO, if this thing is meant to be used as regulated supply voltage.

I don’t get it, where did the 9ohms come from? Andy aka k 10 Try to find a datasheet for your datahseet zeners which shows the breakdown characteristics.

Even if it specified at 70mA, there is going to be some there and in this case it is not negligible therefore it must be incorporated in to your circuit model, that why your circuit analysis provides a different answer but adding the zener resistance to the model gives a solution that approaches more closely your result.

Actually, this does explain what Daasheet seeing and your result is pretty spot on with what I’m reading. You don’t say what you saw there. I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3.

The two Zeners in question are: This query was simply to highlight my dismay at how poor these zeners really are!

(PDF) 1N4729A Datasheet download

I see your edited? Since you are driving more than 10 times that amount of current through it, it is no wonder that your voltage is high.

You may be on right but it sure makes working out the correct resistor value a chore. Null 4, 10 22 The dynamic resistance of the Zener may not be able to drop low enough, even with 70mA available to it, to make the proper resistor divider equivalent for the node to be equal to 3.

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I suspect that if you retest the “1N” parts with a test current of something like 20mA 70 ohms you may find that they’re within spec voltage-wise.

No load except for the DMM.

1NA datasheet & applicatoin notes – Datasheet Archive

First this stated in the question: It’s incorrect to add a voltage at the test current because of the dynamic resistance. You do not see 3. Zeners with nominal voltages less than 5V or so have very soft ‘knees’ poor regulation and are not really that useful as usually better alternative are available. Rather than use rules of thumb which you may or may not understand, you should first look at the data sheet of the part you’re using.

Working out the current limiting resistor we have: Email Required, but never shown.

If you want to get 3. I set up the standard test circuit shown below.

Does datashheet conflict with what Kvegaoro is saying? Actually, as it happens I had reached the same conclusion. WhatRoughBeast 49k 2 28 Therefore a better model of the zener diode is the zener diode plus the zener resistance in series. At least at no load or very small load the LDO regulator will be way more efficient.