SMBJ4737A/TR13

Introduction

SMBJ4737A/TR13 is a single diode zener device with a reverse breakdown voltage of 13 V and a maximum working power dissipation of 1 W. It is designed to provide transient overvoltage suppression in order to protect the connected electronic components or systems from the effects of transients induced by electrical noise, electrostatic discharge (ESD) or the voltage spikes generated during automotive glow-plug operation.

Application Field

The SMBJ4737A/TR13 is mainly used as a transient voltage suppressor in automotive and non-automotive applications, such as in HVAC systems, consumer electronics, and other low voltage-controlled circuits. It is most commonly used for overloaded power supplies and for the suppression of transients in automotive systems, such as in on-board computers, switches and other control panels.

Working Principle

The SMBJ4737A/TR13 works on the principle of zener breakdown. When the voltage across the diode exceeds the breakdown voltage (in this case, 13V), the zener breakdown takes place and a current surges through the device. This current flow reduces the applied voltage across the zener diode to a level below the zener breakdown voltage, thus limiting the voltage and saving the connected electronic components from being damaged by the voltage spike.

Advantages

The SMBJ4737A/TR13 has several advantages over other similar transient voltage suppression components, such as:

• The low cost of the device
• The small physical size of the device
• High reliability and performance
• High temperature stability
• High surge current capability
• High energy absorption capability

Conclusion

In conclusion, the SMBJ4737A/TR13 is a reliable, low cost, and small form factor single diode zener device which is suitable for protecting low voltage-controlled circuits from the effects of transients induced by electrical noise, ESD, or the voltage spikes generated during automotive glow-plug operation. It is used in many automotive and non-automotive applications, such as in HVAC systems, consumer electronics, and other low voltage-controlled circuits.