1N4148 SIGNAL DIODE
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The 1N4148 is one of the most widely used and recognizable small signal switching diodes in electronics. It's known for its high speed, making it suitable for applications where rapid changes in voltage or current need to be handled.
⚡ 1N4148 Product Detail
Core Function and Type
The 1N4148 is a silicon epitaxial planar switching diode. Its primary function is to act as a very fast, one-way switch for electrical current.
Silicon: The material used for the semiconductor junction.
Small-Signal: Indicates it's designed for low-power, signal-level applications rather than high-power rectification.
Switching: This is its key feature. It has a very short reverse recovery time (typically 4ns or less), meaning it can rapidly turn off when the voltage reverses, which is critical in high-frequency circuits.
Key Specifications
Package: Usually found in a small glass body package called DO-35.
Maximum Peak Inverse Voltage (PIV or VRWM): The maximum reverse voltage it can withstand is typically 100V (sometimes specified as 75V continuous).
Maximum Average Forward Current (I_FAVM): The maximum current it can handle continuously is generally around 100mA to 150mA.
Maximum Forward Voltage (V_F): The voltage drops across the diode when it is conducting current (forward biased) is typically around 1V at 10mA.
Power Dissipation (P_D): Usually around 500mW (half a watt).
Common Applications
Because of its speed and small size, the 1N4148 is ubiquitous in digital and analog circuits for:
High-Speed Switching: Used in digital logic and pulse circuits where fast turn-on and turn-off times are essential.
General-Purpose Diode: Used for basic protection, signal clipping, clamping, and voltage steering in low-power circuits.
RF and Communication Circuits: Its low capacitance and fast response make it suitable for various high-frequency signal applications.