SMAJ4474CE3/TR13

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Diodes - Zener - Single

The SMAJ4474CE3/TR13 is a single Zener diode, suitable for a wide range of applications. It is a junction diode with a doping profile specially engineered to facilitate very stable zener breakdowns when a reverse voltage is applied. This is done by increasing the doping concentration along the junction which has the effect of reducing the potential barrier. This ensures the diode will remain on even when the applied voltage rises or falls.

In terms of physical construction, the SMAJ4474CE3/TR13 is a small, thru-hole device with a cathode (negative terminal) and an anode (positive terminal). It has a low temperature coefficient so that it maintains a stable operating voltage across a wide range of temperatures. The package is RoHS-compliant and is UL-approved for safety reasons.

General Characteristics

• Device type: Single Zener Diode
• Voltage: 4.74V ±5%
• Power loss: 70mW
• Current rating: 1mA
• Pulse handling: 150% max IZM
• Insulation resistance: 1000MΩ (Min)
• Package: SMA
• Compliance standards: RoHS, UL

Applications

The SMAJ4474CE3/TR13 is ideal for a wide range of applications since it is a inexpensive and low-power device. It can be used as a voltage clamp in power supplies, to protect circuits from over-voltage, as a temperature sensor, or to make a temperature compensation circuit. It can also be used as a voltage reference in voltage regulator circuits, and as a protective circuit for electrostatic discharge.

Working Principle

When a reverse voltage is applied to a standard junction diode, it acts as an open circuit until the voltage becomes large enough to break down the p-n junction. This increased current causes a sudden drop in voltage, turning the diode on. However, the situation is different with a Zener diode. Here, the doping profile is such that the potential barrier is significantly reduced. This allows the voltage to be increased much higher without the diode being turned on. Once the voltage reaches its Zener voltage, the diode is turned on, and a reverse current is passed through the p-n junction. The Zener diode will remain on until the applied voltage is reduced to a level below the Zener voltage.

The SMAJ4474CE3/TR13 is specially designed for use in applications that require a very stable and precise Zener voltage breakdown. This is done by increasing the doping concentration along the junction, which reduces the potential barrier and ensures the diode will stay on even if the applied voltage changes. The low temperature coefficient also contributes to improved accuracy and stability.

Conclusion

The SMAJ4474CE3/TR13 is a single Zener diode that is suitable for a wide range of applications, including voltage clamping, over-voltage protection, and temperature sensing. It is a low power device with a low temperature coefficient to ensure stability and precision. With its wide range of features, the SMAJ4474CE3/TR13 is an excellent choice for any application.

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