1N2985A

Diodes are fundamental passive components used in both analog and digital circuits. Zener diodes are a type of diode that is used to stabilize voltages, generate precise references and protect circuits. A single zener diode, the 1N2985A, is used in many applications to work with its built-in reverse breakdown voltage and precise temperature coefficient features. This article will explore the applications and working principles of the 1N2985A.

1N2985A Application Fields

The 1N2985A is used in voltage regulating and protection circuits, precision analog circuits and as a reference source for AC circuits. It is a high-quality silicon diffused junction diode with an operating temperature range of -55°C to +150°C and a peak reverse voltage of 40V. Designed to have an excellent operating stability, it\'s used in a range of power supplies and applications, such as linear or switch-mode regulators and battery chargers, for constant voltage or current output.

The 1N2985A is also widely used in automated test equipment and precision applications, including current limitation and crowbar protection circuits. It is also used in timing and pulse shaping circuits, selected SLEDs and power diodes in automotive and other power supply applications.

1N2985A Working Principle

The 1N2985A is a Zener diode, also known as a "silicon diode". It has an anode and a cathode, and when a positive voltage is applied to the anode, the diode begins to conduct current. Upon application of the right level of reverse voltage, the 1N2985A conducts a certain amount of current in the reverse direction, called "Zener breakdown".

This current is limited by the built-in dynamic resistance of the diode, which is known as "Zener impedance". By limiting this current, it regulates the voltage level at a fixed value, which allows for precise voltage references and protection circuits. The Zener impedance varies with temperature, so the breakdown voltage will also change accordingly.

In addition, the 1N2985A has a temperature coefficient in the range of -2.3mV/°C to -3.3mV/°C, with an operating temperature range of -55°C to +150°C, making it useful in temperature compensated circuits. The built-in Zener impedance also makes it possible to protect against voltage spikes in circuits, allowing for precise voltage regulation and better circuit protection.

Conclusion

The 1N2985A is a single zener diode that is used in many applications. It is capable of providing precise reference voltages, voltage regulation and voltage spike protection, making it useful in various applications. By understanding its applications and working principles, one can better understand how to use this diode in circuit designs.