1N4148 - High-Speed Switching Diode

The 1N4148 is one of the most widely used silicon epitaxial small-signal switching diodes, designed for ultra-fast switching applications. Packaged in a DO-35 glass axial case, it is known for its fast recovery time, low capacitance, and high reliability, making it a staple component in signal processing, logic circuits, protection circuits, and RF applications. Unlike rectifier diodes that are optimized for power handling, or Zener diodes that regulate voltage, the 1N4148 is optimized for fast response and accurate switching at low currents and voltages. It is especially useful where nanosecond switching speed and signal integrity are critical.

1. Type: High-Speed Switching Diode
2. Reverse Recovery Time: ~4 nanoseconds (fast response, suitable up to 100 MHz)
3. Repetitive Peak Reverse Voltage: 100V
4. Continuous Forward Current: 300 mA
5. Non-Repetitive Peak Forward Surge Current: 2A (for 1 μs pulse)
6. Forward Voltage Drop: 0.62V typical @ 10 mA, ~1V max
7. Reverse Leakage Current: ≤ 25 nA @ 20V (low leakage)
8. Junction Capacitance: ~4 pF at 0V, 1 MHz
9. Operating Junction Temperature: -65°C to +200°C

• Ultra-fast switching speed (nanosecond range).
• Low capacitance for minimal signal distortion.
• Low reverse leakage current, ensuring stable performance.
• Glass-passivated junction for high stability and reliability.
• Compact DO-35 package with axial leads for easy PCB or breadboard mounting.

Applications:

• High-speed switching in digital and analog circuits.
• Signal routing and steering in communication and RF systems.
• Clipping and waveform shaping circuits.
• Small-signal rectification in low-current applications.
• Logic-level circuits requiring nanosecond response.
• Reverse polarity protection for sensitive electronics.
• Voltage multiplier circuits in power supplies.
• Test and measurement equipment requiring fast signal response.

1N4148 - High-Speed Switching Diode