1N4745PE3/TR12

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	16V
Tolerance:	±10%
Power - Max:	1W
Impedance (Max) (Zzt):	16 Ohms
Current - Reverse Leakage @ Vr:	5µA @ 12.2V
Voltage - Forward (Vf) (Max) @ If:	1.2V @ 200mA
Operating Temperature:	-65°C ~ 150°C
Mounting Type:	Through Hole
Package / Case:	DO-204AL, DO-41, Axial
Supplier Device Package:	DO-204AL (DO-41)
Base Part Number:	1N4745

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Introduction

A 1N4745PE3/TR12 is a Zener Diode, which is a type of semiconductor device that utilizes the zener effect developed by Clarence Zener in 1934. It is characterized by a low dynamic resistance, low reverse leakage current and very low capacitance. As a result, it is widely used in precision electrical circuits and systems, such as voltage-regulating diodes, transient protection diodes, temperature compensation networks, current regulators, half-wave and full-wave rectifiers, etc.

Applications

1N4745PE3/TR12 Zener Diodes are mainly used for voltage regulation, transient protection and current regulation applications. The maximum repetitive peak reverse voltage VRRM (V) of 1N4745PE3/TR12 is 12V, with a maximum rated power dissipation at Pd = 579mW, typical zener voltage at Vz = 4.7V and a typical operating temperature of -55C to +125C. In voltage regulation applications, the 1N4745PE3/TR12 is used to regulate the output voltage of the power supply or to prevent overvoltage of sensitive load devices. In switching power supplies, a Zener Diode is typically included as a voltage regulator to provide overvoltage, undervoltage and transient protection. It can also be used as a frequency selector or a limiter in DC power supplies. In current regulation applications, the 1N4745PE3/TR12 can be used in current limiters to limit the current in the output stage of a power supply, and it is also used to shunt current in solar panels and battery chargers. It is an essential component in battery charging circuits, where the current is kept at a constant level until the battery is fully charged. Moreover, 1N4745PE3/TR12 can also be used as temperature compensation networks and half-wave/full-wave rectifiers.

Working Principle

When a 1N4745PE3/TR12 Zener Diode is reverse biased, the zener breakdown occurs and a small current starts to flow. The voltage across the diode remains constant, which is the zener voltage Vz. This voltage remains constant and acts as the regulating voltage in voltage regulating applications. In current regulating applications, the current passing through the diode is maintained at a constant level up to a certain voltage or current. In both applications, the 1N4745PE3/TR12 functions as a one-way valve that allows current to flow in one direction only. When the voltage or current reaches the zener voltage or current, the diode is forward biased and the current passes through it. This current passes from the higher voltage side to the lower voltage side of the diode, through the diode’s low-resistance channel. When it is in the reverse-biased state, the 1N4745PE3/TR12 Zener Diode acts as an open switch and does not allow any current to pass. This prevents the current from flowing in the wrong direction and also prevents overvoltage or overcurrent from damaging connected components.

Conclusion

In summary, the 1N4745PE3/TR12 is a type of Zener Diode with a low dynamic resistance and low reverse leakage current. It is mainly used in voltage-regulation and current-regulation applications, such as power supplies, battery chargers and temperature compensation networks. The 1N4745PE3/TR12 works on the zener effect, where its threshold voltage Vz remains constant and acts as the regulating voltage or current. It is also used as a shunt to prevent overvoltage or overcurrent from damaging connected components.

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