SML4745-E3/5A

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Diodes are semiconductor devices that allow current to flow in one direction only. Zener diodes are a special type of diode that, when reverse biased, behave as a resistor while passing a very small current. A single Zener diode is the simplest type of Zener diode, and is the most widely used type. SML4745-E3/5A is a single Zener diode.

Application Field

The SML4745-E3/5A has a wide range of applications. It can be used as a voltage limiter in circuits where an overload could damage the device, as a voltage regulator to maintain a stable output voltage, and as a voltage reference for precise voltage measurement. It is also used in the production of high-voltage DC power supplies, to prevent electrical surges from affecting sensitive circuit components.

In addition, it can be used as a noise filter to reduce unwanted electrical noise from entering a circuit, as well as a protection device to protect against overvoltage and overcurrent events. The SML4745-E3/5A is also used in temperature sensing devices, where the temperature can be accurately monitored by measuring the voltage drop of the device.

Working Principle

The working principle of the SML4745-E3/5A is based on the breakdown voltage of the semiconductor material. When a reverse bias voltage is applied, the electric field required to cause a break in the dielectric of the semiconductor material exists and electrons from the N-type region of the material are injected into the P-type region. This produces a negative junction voltage and a reverse current. This current is known as the Zener current.

Once the reverse bias voltage reaches the breakdown voltage of the semiconductor material, the Zener current increases exponentially. This causes a rapid increase in the negative junction voltage and a stabilizing of the voltage across the device, allowing it to be used as a voltage reference. The current flows in a circle and this is known as a Zener diode.

The SML4745-E3/5A has an operating temperature range of -55°C to 150°C and a maximum reverse voltage of 5 volts. It has a capacitance of 10pf, a breakdown voltage of 4.7V, a leakage current at 25°C of 0.2µA and a capacitance of 47kohm. It is rated for up to 1W and is available in a through-hole or surface-mount package.

The SML4745-E3/5A is a popular single Zener diode due to its wide range of applications, its ability to maintain a stable output voltage and its durability in high temperature and voltage environments. It is ideally suited for use in AC/DC output isolation, over-voltage and under-voltage protection, and temperature sensing. It is an efficient, reliable and cost-effective solution for various application fields.

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