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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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. If you want decent accuracy throw the zeners away and use some low dropout 3.
1NA Datasheet(PDF) – Diotech Company.
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. Andy aka k 10 As I pointed out in my query, I used the test currents from the relevant datasheets as a guide.
Since you are driving more than 10 times that amount of current through it, it is no wonder that your voltage is high. Sign up or log in Sign up using Google. If you include the dynamic resistance in the model, you must use a lower voltage for the ideal zener.
Kvegaoro 2, 11 Can you expand on the statement: It’s like the Zener resistance isn’t decreasing as the current increases, which is not what I’d expect. The two Zeners in question are: Even so I expect that the diode you have does match its data sheet. I’m not sure what the temperature coefficient is for this device and the data sheets are lacking in that respect. Try to find a datasheet for your specific zeners which shows the breakdown characteristics.
What’s odd is that the BZX55C is showing more-or-less the same behaviour although with different resistors. The ones with voltage of 5. If you want to get 3.
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 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.
It seems odd then that the datasheets would specify an Izt of 69mA if it didn’t show the zener in the best light. WhatRoughBeast 49k 2 28 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”. If you increase the datassheet the voltage across the zener should go down.
Indeed it would seem to be a much easier solution to just get an adjustable LDO, if this thing datashfet meant to be used as regulated supply voltage. At least at no load or very small load the LDO regulator will be way more efficient. Actually, it was a candidate for a regulated supply fed by a CCS.
1NA Datasheet pdf – V, 1 W silicon zener diode – BKC International Electronics
This query was simply to highlight my dismay at how poor these zeners really are! 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. Typically the dynamic resistance of the 1NA is about 5 ohms, so you could approximate it with an ideal 3. I wanted to confirm that I wasn’t doing anything stupid. The next problem is that at 70mA and 4 volts, the power is 0.
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. Spehro Pefhany k 4 You don’t say what you saw there. Is that the dynamic resistance of the zener?
Working out the current limiting resistor we have: Both Zeners came from separate suppliers. It’s incorrect to add a voltage at the test current because of the dynamic resistance. 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.
Sign up using Email and Password. Home Questions Tags Users Unanswered. Email Required, but never shown. Zeners are notoriously power inefficient even at no load. No load except for the DMM. The closer to the minimum input voltage the more difficult it will be to avoid large changes in current flowing through the TL Can I still get a reliable voltage if Vcc dips below 5V?
See Fig 2 in diodes.
(PDF) 1N4729A Datasheet download
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.
I don’t get it, where did the 9ohms come from? Sign up using Facebook. I have a question about the regulation accuracy or lack of datasueet a 3V6 Zener diode.