SML4734-E3/61

Introduction

The SML4734-E3/61 is one of the single Zener diodes manufactured by Fairchild Semiconductor. It is a low-cost, thermally enhanced miniaturechip package. The SML4734-E3/61 is designed to protect sensitive circuits from overvoltage transients and/or surges. It is rated for a Vz max of 6.1V and a dynamic resistance of only 0.3 Ohm and very low 250 mA max current. It is packaged in the ultra-small 2-Pin SOT-363 package.

Application Field

The SML4734-E3/61 is suitable for use in a wide variety of applications. It can be used in any application that requires a low-cost, highly reliable transistor-made device. The SML4734-E3/61 is suitable for use in signal and power conditioning, current sensing, switching voltage regulators, and any other application where a low noise and low power consumption device is needed. Furthermore, since it is manufactured using the thermally enhanced chip packaging, it can also be used in applications where a miniaturized profile is desired.

Working Principle

The SML4734-E3/61 functions as an overvoltage and/or surge protection device. It utilizes an electrostatic protection circuit, which allows the device to react quickly to an overvoltage condition or surge and shut off power to the protected circuit. The SML4734-E3/61 is operated as a shunt regulator, meaning it dissipates excess voltage by shunting it away from the protected circuit. This is achieved by utilizing a Zener diode and a field effect transistor (FET), in order to absorb and dissipate the overvoltage.

Once the overvoltage exists, the FET acts as a switch to connect the Zener diode to the protected circuit, thus absorbing and dissipating the overvoltage. After the excess voltage has been removed, the FET returns to its normally “off” position, re-stabilizing the voltage and leaving the protected circuit unharmed. The device is very durable, and it is designed to have a long lifetime, with up to 2 million cycles of protection and a maximum rated operating temperature of 105 degrees Celsius.

Conclusion

The SML4734-E3/61 is a single Zener diode manufactured by Fairchild Semiconductor. It is designed to protect circuits from overvoltage transients and/or surges, and is capable of a Vz max of 6.1V, a dynamic resistance of 0.3 Ohm, and a maximum current of 250 mA. It is suitable for use in a variety of applications, such as signal and power conditioning, current sensing, and switching voltage regulators. The device works by utilizing an electrostatic protection circuit which includes a Zener diode and FET, allowing it to quickly absorb and dissipate excess voltages and protect the protected circuit from damage. It has a long lifetime of up to 2 million cycles of protection and a maximum rated operating temperature of 105 degrees Celsius.