1N4148 High-Speed Switching Diode 100V 200mA Through Hole DO-35

1N4148 High-Speed Switching Diode – 100V 200mA Through Hole (DO-35)

The 1N4148 is a small-signal, high-speed silicon switching diode in the DO-35 glass package. With a peak reverse voltage of 100V and a forward current of 200mA, it is optimised for fast switching applications where recovery time is critical — making it a staple in digital and RF circuits worldwide.

Key Specifications

• Package: DO-35 (Through Hole, Glass)
• Peak Reverse Voltage: 100V
• Forward Current: 200mA
• Forward Voltage: ~0.7V at 10mA
• Reverse Recovery Time: 4ns max
• Power Dissipation: 500mW
• Operating Temperature: −65°C to +175°C

Compatibility & Use Cases

The 1N4148 is used extensively in circuits alongside Arduino, ESP32, and other microcontrollers for signal-level switching and protection. Common applications include:

• Logic signal clipping and clamping circuits
• Flyback protection for relay coils and inductive loads
• Demodulation and envelope detection in RF circuits
• Voltage reference and level-shifting circuits
• Waveform shaping and peak detection

Its ultra-fast 4ns recovery time makes it far superior to rectifier diodes like the 1N4007 for high-frequency switching tasks.

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