JANTX1N4981CUS

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Diodes, such as Zener diodes, are commonly used for many applications requiring the reduction of alternating current signals to a completely distinct DC voltage, the voltage clamping of an AC signal to a particular value, or the venting of excess energy to the ground in a circuit. The JANTX1N4981CUS is one such device and is a low-power (1/5W), trimmable, 350 mW surface-mount Zener diode. This article will look at its application field as well as its working principle.

Application Field

The JANTX1N4981CUS is primarily used in applications such as shunt regulators, low dropout regulator applications, DC-DC conversion circuits, pitch control circuits, drive circuits for DC motors and pumps, and for voltage regulation for the distributed power supplies used in several military equipment. The JANTX1N4981CUS can also be used in circuits that require low dispersions in post-assembly trimming, as its trimming current can be adjusted to the desired value. The JANTX1N4981CUS is a single Zener diode that has a wide range of applications in various fields.

Features

The JANTX1N4981CUS features a minimum Zener Voltage of 3.2 V and a maximum Zener Voltage of 5.4V. This makes its useful for a variety of applications as it can be used both in low-voltage and high output current circuits. In addition, the base level alignment voltage of the JANTX1N4981CUS is adjusted both before and after soldering and this helps to reduce the amount of post-assembly trimming required. The diode is available in a variety of packages and its reverse breakdown Voltage is well-matched for use in high-frequency switching circuits.

Working Principle

A Zener diode works on the principle of reverse-biased voltage breakdown. In a normally-biased diode, such as a regular silicon diode, the electric field across the junction is oriented in such a way that only forward current can be conducted when a voltage is applied. The electric field in a Zener diode is oriented in the opposite direction so that it is possible for the diode to conduct a current in the reverse direction when a sufficiently high voltage is applied. When a voltage greater than the breakdown voltage of the diode is applied, the electric field is strong enough to breakdown the junction and allow current to flow in the reverse direction.

Once the voltage is greater than the breakdown voltage, the diode will continue to conduct a current until the voltage is removed or decreased. This allows for the regulation of the voltage across the diode and this is how the JANTX1N4981CUS is able to provide a regulated voltage output for different applications. The diode is also able to operate over a wide range of temperatures and bias conditions without requiring external components.

Conclusion

The JANTX1N4981CUS is a low-power trimmable 350mA surface-mount Zener diode commonly used in many applications requiring the regulation of AC signal voltages to DC voltages. The diode is available in a variety of packages and has a wide range of applications in various fields including shunt regulators, low dropout regulator applications, DC-DC conversion circuits, pitch control circuits, and drive circuits for DC motors and pumps. The JANTX1N4981CUS operates on the principle of reverse-biased voltage breakdown and its trimming current can be adjusted to the desired value.

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