1N4478

Series:	--
Packaging:	Bulk
Part Status:	Active
Voltage - Zener (Nom) (Vz):	36V
Tolerance:	±5%
Power - Max:	1.5W
Impedance (Max) (Zzt):	27 Ohms
Current - Reverse Leakage @ Vr:	50nA @ 28.8V
Operating Temperature:	-55°C ~ 175°C
Mounting Type:	Through Hole
Package / Case:	Axial
Supplier Device Package:	Axial

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Introduction to 1N4478

The 1N4478 diode, also known as a Zener diode, is a form of semiconductor device typically used for voltage regulation, signal clipping, voltage multiplication, and other similar applications. It\'s a single-in-line semi-conductor diode that provides circuit protection and control.

Application Field

The 1N4478 Zener diode is useful in a variety of applications. It\'s commonly found in voltage-regulating circuits and DC power supplies, as well as signal-clipping and overvoltage protection circuits. It can also be used as a temperature-sensing device and current limiter, among other things.

Voltage Regulation

In a voltage-regulating circuit, the 1N4478 diode is used to protect sensitive components from high voltage. It prevents excessive voltage from entering the circuit, allowing only predetermined levels of current to pass through. It\'s also used in DC power supplies, where it helps to maintain the stability of the circuit.

Signal Clipping

The 1N4478 diode can also be used for signal clipping and voltage-limiting applications. It\'s used in such a way as to allow a signal to reach a predetermined level before the diode begins to block the signal. This can be used to prevent signals from exceeding certain predetermined levels, thus protecting sensitive components in the circuit.

Voltage Multiplication

The 1N4478 diode is also used in voltage multiplication applications, where the device is used to create higher voltage levels than what is present in the circuit. This is done by using two diodes connected in a ladder arrangement, with the output taken from the junction of the two diodes. The circuit will then produce a voltage level at the output that is twice the voltage level at the input.

Working Principle

The 1N4478 diode works by creating a voltage drop across the diode, which allows only a certain amount of current to pass through the device. The voltage that is dropped across the diode is determined by the applied voltage and the rated current of the diode. The diode has a voltage-breakdown rating that represents the maximum amount of voltage that can be applied across the diode. When the applied voltage exceeds the voltage-breakdown rating of the device, the diode will allow a higher level of current to pass through, thus providing protection to the circuit. The 1N4478 diode can also be operated in reverse-bias mode, where the voltage applied to the diode is lower than the voltage-breakdown rating. With the diode in this mode, no current will be allowed to pass through it.

Conclusion

The 1N4478 diode is a useful component in a variety of applications. It can be used for voltage regulation, signal clipping, and voltage multiplication, as well as providing circuit protection and current limiting capabilities. Its working principle is based on the creation of a voltage drop across the device, which allows only predetermined levels of current to pass through it.

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