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Diodes - Zener - Single

The 1N4738A-TP is a single Zener Diode with an exponential characteristic. It has a maximum power dissipation of 1 Watt. Its maximum reverse avalanche voltage is 9.1 Volts. Its maximum forward voltage drop is 1.2 Volts. Its silicon junction has a temperature coefficient of 5 mV/°C, and its nominal Zener Impedance is 5 Ohms. The device is encapsulated in a 0.5 inch Lead/steel case with a voltage indication mark on top.

Application Field Of 1N4738A-TP

The 1N4738A-TP is a widely used component for voltage regulation, voltage clamps, over-voltage protection and other applications. Its main features make it ideal for power supplies, automotive electronics, audio and telecom equipment. In power supplies, it is typically used in circuits to regulate the output voltage of an AC power adapter and to limit peak current in transformer-coupled circuits.

In automotive electronics, it can be used in circuits to sense battery voltage and protect circuits from transients caused by current surges in an automotive environment. Additionally, it is also suitable for use in audio applications where it can act as a buffer between source and load levels and attenuate RF interference.

In telecom equipment, it is used extensively in circuits to monitor and control power, while in digital applications, it is used in voltage detection, current limiter and inprotection circuits.

Working Principle Of 1N4738A-TP

When used as a voltage regulator, the 1N4738A-TP works on the principle of Zenerbreakers. It functions in much the same way as a standard diode, allowing current to flow in the forward direction and blocking it in the reverse direction. However, when the reverse voltage applied to the diode exceeds its Zener voltage, a voltage-limiting breakdown occurs, resulting in a sharp increase in the current flow.

The breakdown voltage of the 1N4738A-TP can be adjusted by increasing or decreasing the current flowing through the diode, or by controlling the externally applied voltage. To maintain a steady voltage output, a regulated power supply uses a Zener diode in combination with voltage-regulating circuitry. As the input voltage fluctuates, feedback from the regulated output is used to adjust the output voltage so that it remains constant.

The 1N4738A-TP also works in over-voltage protection circuits. In this scenario, the diode is placed in series with the protected circuit, and the reverse breakdown voltage is adjusted such that the voltage across the protected circuit never exceeds a preset limit. If the voltage across the protected circuit is higher than the Zener voltage applied to the diode, current passes through the diode, preventing further rise in the voltage across the protected circuit.

Conclusion

The 1N4738A-TP is an excellent solution for voltage regulation and over-voltage protection. Its 1 Watt power dissipation and 9.1 Volts maximum reverse avalanche voltage make it suitable for a variety of applications, from power supplies and automotive electronics to audio and telecom equipment. Moreover, its versatile Zenerbreaker characteristic makes it suitable for use in constant voltage regulation and over-voltage protection circuits.

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