SMD Zener diode introduction

SMD Zener Diode

Glass, LL34 (1/2W), LL41 (1W), LS-34;

Plastic package, SOD-123, SOD-323, SOD-523

model:

LL4148 LL34 2.2V LL34—75V LL34 (1/2W glass), 3.3V—56V LL41 (1W glass)

2.2V—75V voltage regulator series

MM1Z2V0~MM1Z75

The models and voltage regulation values of commonly used Zener diodes are as follows:

 Model number: 1N4728, 1N4729, 1N4730, 1N4732, 1N4733, 1N4734, 1N4735, 1N4744, 1N4750, 1N4751, 1N4761

 Voltage regulation value: 3.3V, 3.6V, 3.9V, 4.7V, 5.1V, 5.6V, 6.2V, 15V, 27V, 30V, 75V

Zener diodes are used in the over-voltage protection circuits in TV sets, and in series-type voltage-stabilizing circuits, the series-type voltage-stabilizing circuit is used in many occasions, and more stable power can be obtained through series connection.

Zener diodes are often represented by "ZD" plus a number in the circuit.

Five parameters of Zener diode:

1. Stable voltage

With the change of operating temperature and current, the Zener diode needs to be stabilized.

2. Working current

The voltage stabilizing diode changes according to the operating current. In general, the operating current is large, and the effect of voltage stabilization will be better.

3. Stable current

The Zener diode can stabilize voltage with the current when it is working.

4. Dissipated power

In actual use, the Zener diode consumption is not allowed to exceed the standard.

5 dynamic resistance

When dynamic resistance is working, it will change due to current and other reasons. Zener diode is a surface contact type crystal diode made of silicon material, referred to as Zener tube.

 A diode is a semiconductor device that has a very high resistance up to the critical reverse breakdown voltage. When the Zener tube is reversed breakdown, within a certain current range (or within a certain range of power loss), the terminal voltage is almost unchanged, showing the characteristics of voltage stabilization, so it is widely used in stabilized power supplies and limiting circuits Among. Zener diodes are classified according to breakdown voltage. Because of this characteristic, Zener diodes are mainly used as regulators or voltage reference components. Zener diodes can be connected in series for use at higher voltages, and more stable voltages can be obtained by connecting them in series, which are called bidirectional voltage regulators.

Pingshang Technology SMD electronic component manufacturers provide chip transistors, chip resistors, chip capacitors, chip inductors, etc. Pingshang Technology has its own plant, excellent production equipment, and sufficient supply. Welcome to consult.