JAN1N4489DUS

Series:	Military, MIL-PRF-19500/406
Packaging:	Bulk
Part Status:	Active
Voltage - Zener (Nom) (Vz):	100V
Tolerance:	±1%
Power - Max:	1.5W
Impedance (Max) (Zzt):	250 Ohms
Current - Reverse Leakage @ Vr:	250nA @ 80V
Voltage - Forward (Vf) (Max) @ If:	1V @ 200mA
Operating Temperature:	-65°C ~ 175°C
Mounting Type:	Surface Mount
Package / Case:	SQ-MELF, A
Supplier Device Package:	D-5A

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Introduction of JAN1N4489DUS and Its Application Field and Working Principle

The JAN1N4489DUS diode belongs to the family of single Zener diodes with a 9.1V Zener voltage and a 2W power dissipation. Its solid-state construction eliminates the noise, current surging and intermittent failures associated with traditional mechanical relays. The Zener diode allows voltage to pass in one direction and regulates it for use in the opposite direction.

Features

The JAN1N4489DUS compares favorably with other single Zener diodes in terms of features. It features a reverse breakdown voltage of 9.1V, and is capable of operating within -65° C to +150° C. The diode features a maximum reverse current of 300µA, a forward voltage drop of 1.1V at a specified current, and a maximum total power dissipation of 1,500 mW. It also has a forward surge current of 8.3A.

Applications

The JAN1N4489DUS Zener diode offers a wide range of practical applications and is commonly found in power management circuits. It can be used to regulate the terminal voltage of a step-down DC-DC regulator, or as a shunt regulator to protect an integrated circuit from overvoltage damage. Another common application of the Zener diode is in voltage multipliers and clamping circuits.In voltage multipliers, the diode can be used to doubly enhance the output voltage of an AC power source. For example, when 13V is applied across the diode, the output may be higher than 26V. In clamping circuits on the other hand, the Zener diode works in conjunction with a capacitor to limit the maximum voltage to a certain value. This capability is particularly useful for electronics systems where transient voltages can otherwise cause circuitry errors.

Working Principle

When a Zener diode is in its forward-bias state, it behaves like a typical diode, allowing a small current to pass through it. However, when the voltage across the diode rises above the diode’s assigned Zener voltage, the diode enters the reverse breakdown state. When that critical voltage is reached, a small current flows in the opposite direction, allowing the voltage to drop back to the Zener voltage. These constant fluctuations in the Zener diode occur in an effort to maintain the flow of current through the circuit, and ensure that the output voltage is stable.

Conclusion

The JAN1N4489DUS diode is a single Zener diode capable of withstanding voltages of up to 9.1V and handling power dissipation of 1.5W. The diode is suitable for a variety of applications, including power management, voltage multipliers, and clamping circuits. The Zener diode works by constantly adjusting current flow through the circuit, in order to maintain the output voltage at a constant level.

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