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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The next problem is that at 70mA and 4 volts, the power is 0. If you include the dynamic resistance in the model, you must use a lower voltage for the ideal zener.

Andy aka k 10 Typically datsheet dynamic resistance of the 1NA is about 5 ohms, so you could approximate it with an ideal 3. Is that the dynamic resistance of the zener? Email Required, but never shown. See Fig 2 in diodes. 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.

What output volta de you require? You may be on right but it sure makes working out the correct resistor value a chore. Actually, as it happens I had reached the same conclusion. 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. There are a couple of issues here.

(PDF) 1N4729A Datasheet download

I wanted to confirm that I wasn’t doing anything stupid. First this stated in the question: Post Your Answer Discard Dagasheet clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


Try to find a datasheet for your specific zeners which shows the breakdown characteristics. No load except for the DMM.

If you increase the resistor the voltage across the zener should go down. Null 4, 10 22 Even so I expect that the diode 1n4729s have does match its data sheet. 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.

The problem is how you are modeling your circuit, because the series resistance you are using is so close the zener resistance, it must included in the circuit model. You do not see 3. In fact, as I increase and decrease the resistor value, the Zener catasheet increases and decreases along with it.

WhatRoughBeast 49k 2 28 Buck8pe 8 In my experience, low-voltage zeners anything below 5V all seem to have a very soft ‘knee’ and not particularly ‘vertical’ current-vs-voltage curve. Sign up using Facebook. The closer to the minimum input voltage the more difficult it will be to avoid large changes in current flowing through the TL Therefore a better model of the zener diode is the zener diode plus the zener resistance in series.

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At least at no load or very small load the LDO regulator will be way more efficient. Actually, this does explain what I’m seeing and your result is pretty spot on with what I’m reading.

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. The two Zeners in question are: The dynamic datazheet describes the small-signal behavior near the test current.


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1NA Datasheet(PDF) – Fairchild Semiconductor

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. 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. Spehro Pefhany k 4 I’m not sure what the temperature coefficient is for this device and the data sheets are lacking in that respect.

Does this conflict with what Kvegaoro is saying? It seems odd then that the datasheets would specify an Izt of 69mA if it didn’t show the zener in the best light. As I pointed out in my query, I used the test currents from the relevant datasheets as a guide.

If you want to get 3. Actually, it was a candidate for a regulated supply fed by a CCS. Can you expand on the statement: For low voltage shunt regulation either use a series regulator LDO or a device such as the TL which has a band gap reference, and an opamp in a 3-poin package to create an almost perfect “Zener diode”.