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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(PDF) 1N4729A Datasheet download

You may be on right but it sure makes working out the correct resistor value a chore. 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”.

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. How much current will th load require?

The ones with voltage of 5. Working out the current limiting resistor we have: 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.

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. See Fig 2 in diodes. 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. 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.

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Sign up using Email and Password. Does this conflict with what Kvegaoro is saying? Even so I expect that the diode you have does match its data sheet.

Actually, this does datwsheet what I’m seeing and your result is pretty spot on with what I’m datadheet.

The problem datasheett 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. 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. Post as a guest Name.

Actually, as it happens I had reached the same conclusion. Sign up using Facebook. Zeners are notoriously power inefficient even at no load.

There are a couple of issues here. Double check this supply. Null 4, 10 22 Sign up or log in Sign up using Google. Home Questions Tags Users Unanswered. I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3. Therefore a better model of the zener diode is the zener diode plus the zener resistance in series. The dynamic resistance describes the small-signal behavior near the test current. If you increase the resistor the voltage across the zener should go down.

It’s incorrect to add a voltage at the test current because of the dynamic resistance. WhatRoughBeast 49k 2 28 I see your edited? I’m not sure what the temperature coefficient is for this device and the data sheets are lacking in that respect. At least at no load or very small load the LDO regulator will be way more efficient. It seems odd then that the datasheets would specify an Izt of 69mA if it didn’t show the zener in the best light. First this stated in the question: The two Zeners in question are: You do not see 3.

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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.

Semtech 1NA – PDF Datasheet – Zener Diodes In Stock |

That part of kveagaro’s answer is not correct. If you want to get 3. Both Zeners came from separate suppliers. If you include the dynamic resistance in the model, you must use a lower voltage for the ideal zener. Since you are driving more than 10 times that amount of current through it, it is no 1n4729aa that your voltage is high.

Actually, it was a candidate for a regulated supply fed by a CCS. Email Required, but never 1n4729. 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. This query was simply to highlight my dismay at how poor these zeners really are!

What’s odd is that the BZX55C is daatsheet more-or-less the same behaviour although with different resistors. 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.

Xatasheet 2, 11 I don’t get it, where did the 9ohms come from? 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.