1N4729A DATASHEET PDF

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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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Both Zeners came from separate suppliers. The closer to the minimum input voltage the more difficult it will be to avoid large changes in current flowing through the TL 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.

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. The next problem is that at 70mA and 4 volts, the power is 0.

What output volta de you require? 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. Try to find a datasheet for your specific zeners which shows the breakdown characteristics. 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.

The ones with voltage of 5.

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1NA Datasheet(PDF) – Diodes Incorporated

Andy aka k 10 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.

That part of kveagaro’s answer is not correct. 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. Post as a guest Name.

If you want decent accuracy throw the zeners away and use some low dropout 3. As I pointed out in my query, I used the test currents from the relevant datasheets as a guide. Double check this supply.

I wanted to confirm that I wasn’t doing anything stupid. Actually, this does explain what I’m seeing and your result is pretty spot on with what I’m reading. Typically the dynamic resistance of the 1NA is about 5 ohms, so you could approximate it with an ideal 3. Datasheet 2, 11 Does this conflict with what Kvegaoro is saying? Zeners are notoriously power inefficient even at no load. Since you 1n479a driving more than 10 times that amount of current through it, it is no wonder that your voltage is high.

Renesas – datasheet pdf

You don’t say what you saw there. First this stated in the question: There are a couple of issues here.

If you include the dynamic resistance in the model, you must use a lower voltage for the ideal zener. See Fig 2 in diodes.

(PDF) 1N4729A Datasheet download

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

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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.

The two Zeners in question are: I’m not sure what the temperature coefficient is for this device and the data sheets are lacking in that respect.

Can I still get a reliable voltage if Vcc dips below 5V? Sign up using Email and Password. 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 1h4729a of the website is subject to these policies.

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. In fact, as I increase and decrease the resistor value, the Zener voltage increases and decreases along with it.

I set up the standard test circuit shown below.