4N303SD

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Optoisolators - Transistor, Photovoltaic Output

The 4N303SD is a 4-pin plastic through-hole ultraviolet opto-isolator transistor output (TOPR-UVP) device from NXP Semiconductor. It has a built-in light-emitting diode (LED) and a photosensitive transistor. It provides up to 3750 Vrms equivalent isolation voltage between input and output.

Applications

• Industrial control systems
• Lighting control
• Intelligent home appliances
• Isolated sensing
• Audio/visual systems
• Portable power supplies.

Features

• Low forward current requirement
• High isolation voltage
• Good CTR linearity
• High temperature stability
• High reliability

Working Principle

The 4N303SD opto-isolator uses a LED as its input device and a photosensitive transistor as its output device. It works by isolating and transforming the digital signal at the input side to an optically isolated signal on the output side. The LED emits light when the input signal is applied, which is then detected by the photosensitive transistor. The transistor then amplifies the optically isolated signal and activates the output.

The input side of this device is easy to drive due to its low forward voltage requirement. The LED is an efficient light source that requires small drive current and operates at low power dissipation. The output side of the opto-isolator is also quite efficient and has a high linearity for better reliability. The output side also has a high temperature stability, which makes it suitable for use in harsh industrial environments.

Advantages

• Low drive current
• Excellent linearity
• High isolation voltage rating
• Low power consumption
• High temperature stability
• High reliability

Conclusion:

The 4N303SD optoisolator offers excellent features and advantages for a wide range of applications. Its high isolation voltage rating makes it suitable for use in industrial control systems, lighting control, audio/visual systems, and many other applications. Its low drive current, low power consumption, and high temperature stability ensure that it can operate reliably in harsh industrial environments. With its excellent features and advantages, the 4N303SD optoisolator can be an excellent choice for any application requiring an optical isolation solution.

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