JAN1N4987D

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JAN1N4987D Application Field and Working Principle

The JAN1N4987D series of zener diodes are a single type of device intended for a wide variety of applications. As a general-purpose device, these diodes are well suited for use in medium power, signal and power supplies, low-level protection circuitry and high-power population applications. These diodes are most commonly used in applications where linearity and temperature stability are important.

JAN1N4987D Device Features:

• The devices have a high forward-breakdown voltage rating that allows them to be used in high-voltage applications
• Low temperature coefficient allows for excellent stability in temperature sensitive applications
• Low leakage currents, immunity to reverse-polarity overloads, and low capacitance excellent for low-power applications
• Linear, predictable voltage-regulating characteristics

JAN1N4987D Working Principle:

The JAN1N4987D operates as both a voltage regulator device and an overvoltage protector device. The device is a two-terminal device composed of an anode and a cathode. The anode is connected to the voltage source and the cathode is connected to the load. When the voltage source exceeds a predetermined voltage (Vz), the device suddenly turns on. The device is then able to regulate the output voltage by limiting or “clamping” it to the zener voltage (Vz).

The device is able to achieve this because it has a low breakdown voltage when the current is derived from the anode (reverse bias). When the voltage at the anode is higher than the zener voltage (Vz), the device suddenly turns on, allowing the current to flow through the device and clamping the output voltage to Vz. The device is then able to maintain a steady output voltage. This is the basic principle of operation of the JAN1N4987D.

Conclusion

The JAN1N4987D is a single type of zener diode with general-purpose capabilities. It is widely used in medium power and high power applications, low-level protection circuitry, and temperature and linearity sensitive ones. Due to its low breakdown voltage, low temperature coefficient and low leakage current, the device is able to perform as both a voltage regulator and an overvoltage protector. The device is able to do this by clamping the output voltage to Vz when the voltage at the anode exceeds it. These features make the JAN1N4987D an ideal choice for a wide variety of applications.

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