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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Is that the dynamic resistance of the zener? 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.

Double check this supply.

Even so I expect that the diode you datashet does match its data sheet. Post Your Answer Discard By 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. In fact, as I increase and decrease the resistor value, the Zener voltage increases and decreases along with it.

If you want decent accuracy throw the zeners away and use some low dropout 3. I don’t get it, where did the 9ohms come from? Spehro Pefhany k 4 Actually, it was a candidate for a regulated supply fed by a CCS. It’s incorrect to add a voltage at the test current because of the dynamic resistance. 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. Rather than datasheeh rules of thumb which you may or may not understand, you should first look at the data sheet of the part you’re using.

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Sign up using Facebook. 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. First this stated in the question: 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.

Therefore a better model of the zener diode is the zener diode plus the zener resistance in series. If you include the dynamic resistance in the model, you must use a lower voltage for the ideal zener. I set up the standard test circuit shown below.

Actually, this does explain what I’m seeing datasheef your result is pretty spot on with what I’m reading. Sign up using Email and Password. It’s like the Zener resistance isn’t decreasing as the current increases, which is not what I’d datashet. That part of kveagaro’s answer is not correct.

I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3. If you increase the resistor the voltage across the zener should go down. Can I still get a reliable voltage if Vcc dips below 5V?

Indeed it would seem to be a much easier solution to just get an adjustable LDO, if ratasheet thing is meant to be used as regulated supply voltage. This query was simply to highlight my dismay at how poor these zeners really are! How much current will th load require? I wanted to confirm that I wasn’t doing anything stupid. There datawheet a couple of issues here.

As I pointed out in my query, I used the test currents from the relevant datasheets as a guide. 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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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”. By dayasheet our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Since you are dataeheet more than 10 times that amount of current through it, it is no wonder that your voltage is high. By 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. Working out the current limiting resistor we have: Zeners are notoriously power inefficient even at no load.

If you want to get 3. What output volta de you require? Typically the dynamic resistance of the 1NA is about 5 ohms, so you could approximate it with an ideal 3.

(PDF) 1N4729A Datasheet download

Kvegaoro 2, 11 The two Zeners in question are: The dynamic resistance describes the small-signal behavior near the test current. Post as a guest Name.

No load except for the Datasheft. What’s odd is that the BZX55C is showing more-or-less the same behaviour although with different resistors. Can you expand on the statement: Null 4, 10 22 Buck8pe 8 Actually, as it happens I had reached the same conclusion.

1NA ON Semiconductor / Fairchild | Ciiva

WhatRoughBeast 49k 2 28 I’m not sure what the temperature coefficient is for this datashset and the data sheets are lacking in that respect. The next problem is that at 70mA and 4 volts, the power is 0. Sign up or log in Sign up using Google.

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