Features
- High-speed switching diode with very short reverse recovery time
- Silicon epitaxial planar diode construction
- Low junction capacitance for high-frequency operation
- Low reverse leakage current
- Suitable for signal switching and pulse circuits
- Standard DO-35 axial glass package
- Compatible replacement for 1N914 diode applications
Principle of Operation
The 1N4148 operates as a semiconductor switch that allows current to flow in the forward direction while blocking reverse voltage. Due to its fast switching characteristics and low recovery time, it can quickly transition between conducting and non-conducting states, making it ideal for digital logic circuits, signal shaping, and high-speed switching applications.
Applications
- High-speed switching circuits
- Signal processing circuits
- Digital logic protection
- Pulse and waveform shaping circuits
- Clamping and protection circuits
- Relay and transistor driver circuits
- General-purpose low-current diode applications
Pinout
| Pin | Name | Description |
|---|---|---|
| 1 | Cathode (-) | Marked with a black band on the diode body |
| 2 | Anode (+) | Positive current input terminal |
Wiring
Connect the anode to the positive side of the signal or supply path and the cathode (marked side) toward the negative or protected side according to the circuit design. Always verify diode polarity before installation.
Specifications
| Parameter | Value |
|---|---|
| Diode Type | Small Signal Fast Switching Diode |
| Model | 1N4148 |
| Maximum Repetitive Reverse Voltage | 100V |
| Maximum Forward Current | 300mA |
| Average Forward Current | 150mA |
| Reverse Recovery Time | 4ns |
| Forward Voltage | Approx. 1V @ 10mA |
| Junction Capacitance | 4pF max |
| Package Type | DO-35 Axial Glass Package |
Specifications are based on manufacturer datasheets and may vary slightly between manufacturers.
Resources
Features
- High-speed switching diode with very short reverse recovery time
- Silicon epitaxial planar diode construction
- Low junction capacitance for high-frequency operation
- Low reverse leakage current
- Suitable for signal switching and pulse circuits
- Standard DO-35 axial glass package
- Compatible replacement for 1N914 diode applications
Principle of Operation
The 1N4148 operates as a semiconductor switch that allows current to flow in the forward direction while blocking reverse voltage. Due to its fast switching characteristics and low recovery time, it can quickly transition between conducting and non-conducting states, making it ideal for digital logic circuits, signal shaping, and high-speed switching applications.
Applications
- High-speed switching circuits
- Signal processing circuits
- Digital logic protection
- Pulse and waveform shaping circuits
- Clamping and protection circuits
- Relay and transistor driver circuits
- General-purpose low-current diode applications
Pinout
| Pin | Name | Description |
|---|---|---|
| 1 | Cathode (-) | Marked with a black band on the diode body |
| 2 | Anode (+) | Positive current input terminal |
Wiring
Connect the anode to the positive side of the signal or supply path and the cathode (marked side) toward the negative or protected side according to the circuit design. Always verify diode polarity before installation.
Specifications
| Parameter | Value |
|---|---|
| Diode Type | Small Signal Fast Switching Diode |
| Model | 1N4148 |
| Maximum Repetitive Reverse Voltage | 100V |
| Maximum Forward Current | 300mA |
| Average Forward Current | 150mA |
| Reverse Recovery Time | 4ns |
| Forward Voltage | Approx. 1V @ 10mA |
| Junction Capacitance | 4pF max |
| Package Type | DO-35 Axial Glass Package |
Specifications are based on manufacturer datasheets and may vary slightly between manufacturers.