Overview
The 1N4148 diode, produced by NXP USA Inc., is a standard silicon switching signal diode known for its fast switching time and high reliability. It belongs to the silicon epitaxial planar diode family and is widely used in high-frequency circuits and fast switching applications. The 1N4148 has replaced the older 1N914 diode and can be used interchangeably with it, offering improved specifications such as lower leakage current.
Key Specifications
| Parameter | Rating | Conditions |
|---|---|---|
| Peak Reverse Voltage (VRRM) | 100 V | Maximum |
| Continuous Forward Current (IF) | 300 mA | @ 25°C |
| Peak Forward Current | 1 A (1 s pulse width), 4 A (1 μs pulse width) | Non-repetitive peak forward surge current |
| Forward Voltage Drop (VF) | 1 V | @ IF = 10 mA |
| Reverse Recovery Time (trr) | 4 ns | Typical |
| Reverse Current (IR) | 25 nA | @ VR = 20 V |
| Maximum Power Dissipation (PD) | 500 mW | |
| Operating Temperature Range | -65°C to +175°C |
Key Features
- Fast Switching Time: The 1N4148 diode has a reverse recovery time of approximately 4 nanoseconds, making it highly suitable for high-frequency switching applications.
- High Reverse Voltage Tolerance: It can handle reverse voltages up to 100 V, providing substantial protection against reverse voltage conditions.
- Low Forward Voltage Drop: The diode exhibits a forward voltage drop of 1 V at 10 mA, which is beneficial for small-signal applications where precise voltage control is crucial.
- Low Leakage Current: It has a very low leakage current in reverse-bias mode, helping maintain signal integrity in precision analog circuits and sensor applications.
- Compact Package: The 1N4148 is available in a small DO-35 glass package, making it ideal for compact designs or PCBs with limited space.
- Reliability and Availability: This diode is known for its high reliability and wide availability, making it a preferred choice for long-term projects.[
Applications
- High-Speed Switching: The 1N4148 is widely used in high-speed switching applications, including pulse generators, frequency mixers, and radio frequency (RF) circuits.
- Signal Processing: It is used in signal processing circuits such as AM demodulation, peak detection, and logic gates due to its fast switching time and low capacitance.[
- Protection Circuits: The diode is often used in protection circuits to safeguard sensitive components from voltage spikes and reverse current, making it essential for industrial automation systems, automotive electronics, and power supplies.[
- Analog Signal Processing: Its low leakage current and fast switching capabilities make it suitable for precision analog circuits and sensor applications.[
Q & A
- What is the typical reverse recovery time of the 1N4148 diode?
The typical reverse recovery time of the 1N4148 diode is approximately 4 nanoseconds.
- What is the maximum peak reverse voltage that the 1N4148 diode can handle?
The 1N4148 diode can handle a maximum peak reverse voltage of 100 V.
- What is the maximum continuous forward current rating of the 1N4148 diode?
The maximum continuous forward current rating of the 1N4148 diode is 300 mA.
- What is the typical forward voltage drop of the 1N4148 diode at 10 mA?
The typical forward voltage drop of the 1N4148 diode at 10 mA is 1 V.
- What is the operating temperature range of the 1N4148 diode?
The operating temperature range of the 1N4148 diode is from -65°C to +175°C.
- What type of package is the 1N4148 diode available in?
The 1N4148 diode is available in a DO-35 glass axial package.
- Why is the 1N4148 diode used in protection circuits?
The 1N4148 diode is used in protection circuits due to its high reverse voltage tolerance and fast switching time, which help protect sensitive components from voltage spikes and reverse current.[
- Can the 1N4148 diode be used in high-frequency applications?
Yes, the 1N4148 diode is highly suitable for high-frequency applications due to its fast switching time and low capacitance.
- What are some common applications of the 1N4148 diode?
The 1N4148 diode is commonly used in high-speed switching, signal processing, protection circuits, and analog signal processing.[
- Why is the 1N4148 diode preferred in many electronic designs?
The 1N4148 diode is preferred due to its high reliability, wide availability, low cost, and robust performance across various temperature ranges.[
