Diode 1N4148 – High-Speed Switching
⚡ 1N4148 – High-Speed Switching Diode
Not a Zener — General-Purpose Signal Diode
The 1N4148 is a fast, low-power NPN silicon switching diode used in logic circuits, pulse generation, rectification, and signal routing. It is not designed for voltage regulation like Zener diodes.
⚙️ Technical Specifications
| Parameter | Specification |
|---|---|
| Type | Standard Silicon Diode |
| Peak Reverse Voltage | 100V |
| Max Forward Current | 300 mA (max) |
| Forward Voltage Drop | ~0.7V @ 10 mA |
| Reverse Recovery Time | ~4 ns (very fast) |
| Package | DO-35 (glass axial) |
✅ Features
⚡ Fast switching speed (~4 nanoseconds)
🔧 Low leakage and power dissipation
📶 Ideal for logic circuits, signal clamping, and diode-OR gates
🔌 Can be used in protection and switching tasks
🧰 Breadboard and PCB compatible
🧪 Common Applications
Protecting microcontroller pins
Reverse polarity protection
Signal rectification and logic level steering
Pulse and timing circuits
🔍 Looking for a Zener Diode?
If you're looking for Zener Diodes (for voltage regulation), here are some correct part numbers:
| Zener Voltage | Part Number |
|---|---|
| 3.3V | 1N4728A |
| 5.1V | 1N4733A |
| 6.2V | 1N4735A |
| 12V | 1N4742A |