5pcs 1n4148 High-Speed Switching Diode

🔹 5PCS 1N4148 – High-Speed Switching Diode

A versatile, general-purpose high-speed switching diode, not a Zener diode. The 1N4148 is one of the most popular and widely used silicon signal diodes for fast switching, clipping, clamping, and protection in low-current circuits across countless electronic applications.

✅ Specifications:

• Part Number: 1N4148

• Type: High-Speed Silicon Switching Diode

• Max Repetitive Reverse Voltage (VRRM): 75V

• Max Continuous Forward Current (IF): 200mA

• Peak Forward Surge Current (IFSM): 450mA (1 second pulse)

• Forward Voltage (VF): ~0.7V (Typical at 10mA)

• Reverse Recovery Time (trr): 4 ns (Very Fast) – Key switching spec

• Package: DO-35 (Small Glass Axial Package)

• Lead Material: Tinned Copper

• Quantity: 5 pieces

⚙️ Key Features:

• Extremely Fast Switching: The 4ns reverse recovery time makes it ideal for high-frequency signal routing, digital logic, and RF applications.

• Low Capacitance: Typically ~4pF, minimizing signal distortion at high frequencies.

• Small Glass Package: The DO-35 glass package is compact and reliable for PCB mounting or prototyping.

• Clearly Marked: Cathode end is marked with a black band for easy polarity identification.

• Reliable & Inexpensive: An industry-standard component with proven performance.

📦 Typical Applications:

• High-Speed Switching: In digital circuits, TTL/CMOS logic, and microcontroller I/O protection.

• Signal Clipping & Clamping: Limiting signal amplitudes in audio and analog circuits.

• Reverse Polarity Protection: For low-current signal paths and sensor inputs.

• Freewheeling Diode: For small relays, solenoids, or inductive loads.

• RF & Mixer Circuits: Detection and demodulation in radio circuits due to its fast response.

• General-Purpose Rectification: For very low-current AC signals (not for power supplies).

🔧 Polarity & Usage Notes:

• Cathode (-) End: Marked with a black band around one end of the glass body.

• Anode (+) End: The unmarked end.

• Current Flow: From Anode (no band) to Cathode (banded end).

• Current Limit: Do not exceed 200mA continuous forward current. It is designed for small signals, not power rectification.

• Heat Sensitivity: The glass package dissipates heat poorly. Avoid excessive soldering heat.

⚠️ Important Distinction & Common Confusion:

• 1N4148 = Switching Diode (75V, 200mA, Fast). Used for on/off control, protection, and signal processing.

• 1N47xx Series (e.g., 1N4733A) = Zener Diode (e.g., 5.1V, 1W). Used for voltage regulation by operating in reverse breakdown.

• Do not use the 1N4148 as a voltage regulator. It will not regulate voltage like a Zener diode.