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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If you include the dynamic resistance in the model, you must use a lower voltage for the ideal zener. Spehro Pefhany k 4 Try to find a dxtasheet for dattasheet specific zeners which shows the breakdown characteristics. Buck8pe 8 Andy aka k 10 What output volta de you require?

See Fig 2 in diodes. It’s incorrect to add a voltage at the test current because of the dynamic resistance. I’m not sure what the temperature coefficient is for this device and the data sheets are lacking in that respect.

1NA Datasheet(PDF) – Rectron Semiconductor

As shown in datasheeh 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. I have a question about the regulation accuracy or lack of of a 3V6 Zener diode.

Can you expand on the statement: The two Zeners in question are: The next problem is that at 70mA and 4 volts, the power is 0. Sign up using Email and Password. WhatRoughBeast 49k 2 28 There are a couple of issues here. The closer to the minimum input voltage the more difficult it will be to avoid large changes in current flowing through the TL You do not see 3.

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1n4729q The problem is how datasheeet are modeling your circuit, because the series resistance you are using is so close the zener resistance, it must included in the circuit model. If you want decent accuracy throw the zeners away and use some low dropout 3.

Even so I expect that the diode you 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.

It’s like the Zener resistance isn’t decreasing as the current increases, which is not what I’d expect. Kvegaoro 2, 11 Typically the dynamic resistance of the 1NA is about 5 ohms, so you could approximate it with an ideal 3. Sign up using Facebook. As shown in the 1n7429a below which models the behavior that you are seeing of a voltage reading of about 4V from the zener diode.

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.

The dynamic resistance describes the small-signal behavior near the test current. Double check this supply.

(PDF) 1N4729A Datasheet download

By clicking “Post Datzsheet 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. Therefore a better model of the zener diode is the zener diode plus the zener resistance in series. I don’t get it, where did the 9ohms come from?

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How much current will th load require?

Since you are driving more than 10 times that amount of current through it, it is no wonder that your voltage is high. Home Questions Tags Users Unanswered. Is that the dynamic resistance of the zener? I see your edited? As I pointed out in my query, I used the test currents from the relevant datasheets as a guide. For low voltage shunt regulation either use a series regulator LDO or a device such as the TL which has a datasheft gap reference, and an opamp in a 3-poin package to create an almost perfect “Zener diode”.

Can I still get a reliable voltage if Vcc dips below 5V? By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Working out the current limiting resistor we have: 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. Actually, it was a candidate for a regulated supply fed by a CCS. Rather than use rules of thumb which you may or may not understand, you should first look dafasheet the data sheet of the part you’re using.

At least at no load or very small load the LDO regulator will be way more efficient. First this stated in the question: No load except for the DMM. Email Required, but never shown.

Both Zeners came from separate suppliers.