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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Actually, it was a candidate for a regulated supply fed by a CCS. Kvegaoro 2, 11 As shown in the circuit below which models the behavior that you are seeing of a voltage reading of about datashest from the zener diode. I don’t get it, where did the 1n4729s come from? Working out the current limiting resistor we have: 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.

(PDF) 1N4729A Datasheet download

The problem is how you are modeling your circuit, because the series resistance you are using is so close dafasheet zener resistance, it must included in the circuit model. Zeners are notoriously power inefficient even at no load.

Can I still get a reliable voltage if Vcc dips below 5V? I wanted to confirm that I wasn’t doing anything stupid. Is that the dynamic resistance of the zener? 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. The dynamic resistance describes the small-signal behavior near the test current. It’s incorrect to add a voltage at the test current because of the dynamic datasyeet.


Actually, as it happens I had reached the same conclusion. Spehro Pefhany k 4 I see your edited? Try to find a datasheet for your specific zeners which shows the breakdown n14729a. You don’t say what you saw there. The ones with voltage of 5.

As I pointed out in my query, I used the test currents from the relevant datasheets as a guide.

1NA Datasheet(PDF) – Jinan Gude Electronic Device

See Fig 2 in diodes. I have a question about the regulation accuracy or lack of of a 3V6 Zener diode.

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.

You do not see 3. Actually, this does explain what I’m seeing and your datasheer is pretty spot on with what I’m reading.

1NA Datasheet pdf – V, 1 W silicon zener diode – BKC International Electronics

How much current will th load require? That part of kveagaro’s answer is not correct. Sign up or log in Sign up using Google. It seems odd then that the datasheets would specify an Izt of 69mA if it didn’t show the zener in the best light. If you include the dynamic resistance in the model, you must use a lower voltage for the ideal zener. 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.

This query was simply to highlight my dismay at how poor these zeners really are! Post as a guest Name. Typically the dynamic resistance of the 1NA is about 5 ohms, so you could approximate it with an ideal 3. 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. 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.


Buck8pe 8 No load except for the DMM. Can you expand on the statement: 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.

WhatRoughBeast 49k 2 28 For low voltage shunt regulation either use a series regulator LDO or a device such as datazheet TL which has a band gap reference, and an opamp in a 3-poin package to create an almost perfect “Zener diode”. First this stated in the question: What’s odd is that the BZX55C is showing more-or-less the same behaviour although with different resistors.

Email Required, datsaheet never shown. 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.

Since you are driving more than 10 times that amount of current through it, it is no wonder that your voltage is high. I set up the standard test circuit shown below.

Null 4, 10 22