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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. Zeners are notoriously power inefficient even at no load. How much current will th load require? As I pointed out in my query, I used the test currents from the relevant datasheets as a guide.

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. See Fig 2 in diodes. Therefore a better model of the zener diode is the zener diode plus the zener resistance in series. 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.


Double check this supply. The next problem is that at 70mA and 4 volts, the power is 0. Andy aka k 10 Actually, it was a candidate for a regulated supply fed by a CCS. What’s odd is that the BZX55C is showing more-or-less the same behaviour although with different resistors.

I see your edited? I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3. Spehro Pefhany k 4 This query was simply to highlight my dismay at how poor these zeners really are!

(PDF) 1N4729A Datasheet download

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. In fact, as I increase and decrease the resistor value, 1m4729a Zener voltage increases and decreases along with it. Can I still get a reliable voltage if Vcc dips below 5V?

No load except for the DMM. Working out the current limiting resistor we have: Because it rises as per the quote you must have an unstable power datasyeet of 5V and this is rising as you increase the load resistance. I set up the standard test circuit shown below.

Buck8pe 8 The two Zeners in question are: Null 4, 10 22 Email Required, but never shown.


Semtech 1NA – PDF Datasheet – Zener Diodes In Stock |

Home Questions Tags Users Unanswered. Post as a guest Name. You do not see 3. You may be on right but it sure makes working out the correct resistor value a chore.

Kvegaoro 2, 11 Since you are driving more than 10 times that amount of current through it, it is no wonder that your voltage is high. Actually, as it happens I had reached the same conclusion.

Both Zeners came from separate suppliers. Sign up using Facebook.

Typically the dynamic resistance of the 1NA is about 5 ohms, so you could datashfet it with an ideal 3. The ones with voltage of 5.

Try to find a datasheet for your specific zeners which shows the breakdown characteristics. WhatRoughBeast 49k 2 28 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. Is that the dynamic resistance of the zener?

Even so I expect that the diode you have does match its data sheet.