1N Package Type: DO, PD: mW, VZ: V Features. VZ Typical Capacitance (pf) versus Zener voltage (VZ) Figure 2 – Derating Curve Figure 2 – Derating Curve. Power Dissipation (mW) 1N ± 1N ± 1N ± 1N 17 a sharp knee on the breakdown curve and to eliminate unstable units.

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The simple answer is that the breakdown voltage can be manufactured to precise specifications over a very large range of voltages. This is when zener diodes come in handy. Zener diodes command a premium because of the special production controls and selection, and are intended specifically for operation in the reverse-breakdown mode primarily as inexpensive voltage references. Note the standard icon used to represent the Zener diode.

Circuits Zener Diode 1 M H Miller The second mechanism is a quantum mechanical effect more difficult to describe by a familiar analogy. The reverse current rating of a Zener diode is somewhat analogous to the forward current rating of a regular diode in that the current rating you would need in a particular application will 1n2530 upon the application.

The minimum usable current is conditioned by the necessity of operation above the knee, i. The Diode – Iona Physics. The regulating action is observable in the curves obtained by an analysis of curvw circuit using the piecewise-linear Zener diode approximation; these are drawn below.

If you depart very far from the current rating, the Zener voltage will vary from the data sheet rating. But currents associated with other phenomena occurring in what is a very complex physical junction environment also can mask the leakage current.

Transistors can be used to boost the drive current of a zener diode, and you may see this in high-voltage power supplies.

But for a hobby box: RB and RL form a resistive voltage divider, making VL somewhat smaller than VS, and so the regulation curve is a line segment of slope somewhat less than 1. 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 use of the website is subject to these policies. When a smaller current is to be provided to the load the excess part of the constant power supply current will be diverted through the Zener diode.


Kinetic energy gained by an accelerated carrier, if sufficiently great, can cause additional impurity atom ionization during a collision with the atom.

In your list of 3 zener diodes of which are the same clamp voltage but different bias currents, some numbers really stand out. Notice the low bias current but also the high impedance. Home Questions Tags Users Unanswered. A test circuit as shown to the left is analyzed numerically using the PSpice computer analysis program.

And when the day comes when you need a better zener, you will know what parameter needs to be better and you will know what to buy then.

It is essentially a measure of the effect of the internal resistance of the supply on the terminal voltage, as the load current changes from one to the other extreme of its specified operating range. What do the data sheets tell you about “other things”? Still, Zeners have their niche in certain applications. The plot shows the output voltage ‘clipped’ by the forward-bias characteristic of the diode.

For reverse-bias voltages less than the Zener voltage the diode behaves roughly as a voltage source in series with a small resistor; for larger voltages it behaves roughly as an idealized diode. In general if you need “the best” then you will have an idea why that is so and then you would know what you would be looking for.

The third guy want the best availability while the fourth guy only buys form Fairchild.

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Regulation computations are shown for several Circuits Zener Diode 5 M H Miller choices of load resistance and so load current. For use as voltage regulators and voltage references Zener diodes have largely been supplanted by IC voltage regulators and IC voltage references because the latter are so inexpensive and small compared to their counterparts of past eras. Andy aka k 10 The higher wattage zeners are for clamping surges on analog or digital inputs, and for directly driving a 15n230 load such as CMOS logic or a switching regulator.


This 1n2530 an older outdated zener, hence the higher bias current. That does not mean you’d always need that.

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A computed set of regulation characteristics using a nonlinear diode mode is shown below for comparison to the calculated regulation characteristics. As VS is increased the 15230 voltage VZ of idealized diode model is reached; because of the voltage-divider action VS will be somewhat larger than VZ when this occurs see figure.

Zener voltage is affected by its drive current, such that if the drive current is too low the zener voltage will be less than the rated clamp voltage. Sign up using Email and Password. For example, a selection of 4. The slope of the characteristic does not vary greatly for currents in the range roughly between 0. Maybe I just want the cheapest one. The breakdown parameters of these Zener or voltage reference diodes receive special processing attention during their manufacture.

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. Post as a guest Ccurve. That 1N is what inspired my question – it’s specified in a little circuit I’m building yet likely not for a finely tuned reason that depends on that specific old part.

As spike suppressors in certain inductive load situations. Documents Flashcards Grammar checker. This is a newer product than the last item and one that I would use, though mW zeners tend to be voltage references, to be boosted by op-amps, etc.