LL4148

The LL4148 is a small-signal diode manufactured by DIOTEC, designed for general-purpose applications in electronic circuits. It is particularly known for its fast switching capabilities and low forward voltage drop, making it suitable for a variety of uses, including signal processing, rectification, and clamping applications.

Key Features:

1. Package Type: The LL4148 is typically available in a DO-35 glass package, which is cylindrical in shape and has two leads extending from either end. This package is compact and allows for easy integration into circuit boards.

2. Electrical Characteristics:

   • Reverse Voltage (VR): The LL4148 has a maximum reverse voltage rating of around 100 volts, making it suitable for applications where moderate reverse voltage is expected.
   • Forward Current (IF): It can handle a forward current of up to 1 ampere, which is adequate for many low to medium power applications.
   • Forward Voltage Drop (VF): The forward voltage drop is typically around 0.7 volts at a forward current of 1 ampere, which contributes to its efficiency in rectification tasks.
   • Reverse Recovery Time (trr): The diode features a fast reverse recovery time, usually in the range of nanoseconds, which is beneficial for high-speed switching applications.

3. Temperature Range: The LL4148 operates effectively over a wide temperature range, typically from -55°C to +150°C, allowing it to be used in various environmental conditions.

4. Applications: Common applications for the LL4148 include:

   • Signal detection and processing
   • Clamping and protection circuits
   • Switching power supplies
   • General-purpose rectification in low-power circuits

5. Construction: The diode is constructed using silicon material, which is standard for semiconductor devices. The glass package provides good thermal stability and protection against environmental factors.

6. Marking: The LL4148 is usually marked with its part number and may include additional markings to indicate the manufacturer or specific batch information.

Summary:

The LL4148 from DIOTEC is a versatile and reliable small-signal diode, ideal for a range of electronic applications due to its fast switching speed, moderate voltage and current ratings, and robust construction. Its characteristics make it a popular choice among engineers and hobbyists for both prototyping and production designs.