SMBG4742C/TR13

Diodes - Zener - Single

The SMBG4742C/TR13 is a single-junction Zener diode. It has a nominal maximum reverse voltage of 13 volts, with a breakdown voltage of around 14 volts and a maximum reverse current of 5 milliamps. It also has a nominal average current of 100 milliamps and a maximum power dissipation of 200 milliwatts.

Application Field

The SMBG4742C/TR13 is primarily used for applications where voltage stabilisation is necessary. This is usually accomplished by having a Zener diode connected in reverse bias with a resistor in series. By selecting the correct Zener diode and resistor value, the circuit can be designed to be effective at the correct voltage. Common applications for the SMBG4742C/TR13 are low-power power supplies, DC-DC converters, LED drivers, voltage regulators and EMI/RFI suppressors.

Working Principle

When a Zener diode is connected in reverse bias, the current flowing through it is exponentially increased. This will eventually reach the Zener breakdown voltage (roughly 14 volts in the SMBG4742C/TR13). At this point a large current will flow through the diode, causing the voltage across it to drop to the nominal reverse voltage of 13 volts. A resistor in series can be used to control the voltage across the diode, allowing it to be set to the correct voltage for the application.

Conclusion

The SMBG4742C/TR13 is a single-junction Zener diode with a nominal maximum reverse voltage of 13 volts and a breakdown voltage of around 14 volts. It is commonly used to provide a positive voltage stabilisation in DC voltage applications such as low-power power supplies, DC-DC converters, LED drivers, voltage regulators and EMI/RFI suppressors. This is achieved by connecting the diode in reverse bias with a resistor in series, allowing the voltage to be set to the correct value.