SMBJ5379A/TR13

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The SMBJ5379A/TR13 is a single Zener Diode which is used widely within electronic device applications. It has a low maximum Zener impedance of 5.1V, a high power dissipation punch down of 600mW and aDO-214AC package size. This component may be employed within multiple application fields requiring voltage trail and regulated voltage levels.

Electrical Characteristic

The following parameters may be observed for an SMBJ5379A/TR13 Zener Diode component:

• Maximum current: 5.1 V\'s
• Maximum Zener Impedance: 47 Ω
• Maximum Power Dissipation: 600 mW
• Peak Forward Voltage :~1 V
• Reverse Breakdown Voltage: 5 V
• Operating Temperature Range: -65℃ to +175℃

Application Field

SMBJ5379A/TR13 Zener Diodes are employed within a variety of applications. The component can be used for voltage regulation, steering signals and for voltage clamps. They can also protect equipment from voltage spikes and surges, allowing higher voltage signals to be clamped and shunted away from surrounding components. This also prevents electrical circuits from malfunctioning or failing.

These components can also be used in low-current applications and across a wide temperature and voltage range. In addition, they are often used as shunt regulators in various electronic devices and systems, such as on-board DC/DC converters. Other usage areas may include converter design, power supply oscillator components, switching regulators and AC-DC converters.

Working Principle

The SMBJ5379A/TR13 Zener Diode works on the principle of reverse-biased Zener breakdown where the reverse current rises exponentially with increasing voltage. The Zener voltage (Vz) is the breakdown voltage at which the reverse current reaches the maximum. When the reverse voltage reaches the breakdown voltage, current is sharply increased and the diode begins to conduct in reverse. This peak current continues until the voltage is greater than the Vz and after that, the current reduces.

The diode can be used as a voltage-limiting device, restricting a certain overvoltage from reaching the other components. As the Zener voltage (Vz) is fixed for a given component, the voltage won’t increase over the breakdown voltage and so, the device won’t suffer any damage.

The Zener voltage of the diode can also be increased by connecting it in series with a resistor. Using this setup, the resistor limits the current and the diode provides a higher Zener voltage. This principle is employed in circuits to obtain greater Voltage Regulation (VR), which is the difference between the no-load voltage and the voltage that is supplied across the load.

Conclusion

The SMBJ5379A/TR13 is a single Zener diode which is employed in a variety of applications requiring voltage regulation, such as DC/DC converter design, power supply oscillator components, switching regulators and AC-DC converters. It has a low maximum Zener impedance of 5.1V and a high power dissipation punch down of 600mW. The Zener voltage can be adjusted by connecting a resistor in series, allowing for an enhanced Voltage Regulation (VR).

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