JAN1N4959D

Series:	Military, MIL-PRF-19500/356
Packaging:	Bulk
Part Status:	Active
Voltage - Zener (Nom) (Vz):	11V
Tolerance:	±1%
Power - Max:	5W
Impedance (Max) (Zzt):	2.5 Ohms
Current - Reverse Leakage @ Vr:	10µA @ 8.4V
Voltage - Forward (Vf) (Max) @ If:	1.5V @ 1A
Operating Temperature:	-65°C ~ 175°C
Mounting Type:	Through Hole
Package / Case:	E, Axial
Supplier Device Package:	E, Axial

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Introduction

The JAN1N4959D is an extremely common and widely used Zener diode in semiconductor devices. It is used mainly in voltage regulation circuits, providing stability and protection against power surges. The JAN1N4959D is a single-zone diode, meaning that it consists of just a single layer of p-type and n-type substrate material.

Application field

The JAN1N4959D\'s most common application fields are in low voltage applications, such as personal electronic devices. This device is also well-suited for medium level voltage applications, such as automotive and telecom. The JAN1N4959D can also be used in high voltage applications, such as variable speed drive motors, lighting ballasts, UPS systems and DC-DC converters.

Physical properties

The JAN1N4959D is a single zone diode which measures 4x6.5mm, making it relatively small in size. The maximum pass current of this device is 10 milliamps with a max power of 500 milliwatts.

Working principle

The JAN1N4959D works by allowing electrical current to pass through when the anode is more positive than the cathode. This current creates an electric field between the two electrodes, inducing a voltage proportional to that of the electric field. The voltage applied across the anode and cathode is then limited by the electric field, thereby regulating the amount of current that passes through the device.When the voltage applied exceeds the maximum rated pass voltage of the device, the JAN1N4959D will enter a high conducting state. The current will then no longer be proportional to the applied voltage, but will follow an exponential curve, which is known as a Zener effect. This will prevent voltage surges from damaging other electrical components.

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