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
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. See Fig 2 in diodes.
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. The ones with voltage of 5.
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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. I don’t get it, where did the 9ohms come from? Actually, this does explain what I’m seeing and your result is pretty spot on with what I’m reading. Kvegaoro 2, 11 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. Post as a guest Name. 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. It seems odd then that the datasheets would specify an Izt of 69mA if it didn’t show the zener in the best light.
It’s like the Zener resistance isn’t decreasing as the current increases, which is not what I’d expect.
Rather than use rules of thumb which you may or may vatasheet understand, you should first look ratasheet the data sheet of the part you’re using. Andy aka k 10 Try to find a datasheet for your specific zeners which shows the breakdown characteristics. You do not see 3. 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.
Can I still get a reliable voltage if Vcc dips below 5V?
This query was simply to highlight my dismay at how poor these zeners really are! 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.
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. Does this conflict with what Kvegaoro is saying?
What output volta de you require? As I pointed out in my query, I used the test currents from the relevant datasheets 1h4729a a guide.
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. If you include the dynamic resistance in the model, you must use a lower voltage for the ideal zener. Double check this supply. 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”. Actually, it was a candidate for a regulated supply fed by a CCS.
Zeners are notoriously power inefficient even at no load. Sign up using Facebook.
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In fact, as I increase and decrease the resistor value, the Zener voltage increases and decreases along with it. I see your edited? It’s incorrect to add a voltage datashret the test current because of the dynamic resistance. I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3.
I wanted to confirm that I wasn’t doing anything stupid.
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. If you want to get 3.