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1N4148 Small Signal Fast Switching Diodes (Pack Of 5)

Specification	Details
Type	Fast Switching Diode
Current Rating	300 mA (Peak)
Voltage Rating	100V (PIV)
Switching Time	4 ns (Nanoseconds)
Package Type	DO-35 (Glass Axial)
Forward Voltage	~1.0V @ 10mA

Price

🚚 Ships within 24 Hours
📦 Pan India Delivery

₹ 16.95

(Tax included)

बारकोड: 5930745

Product Description

The 1N4148 Small Signal Diode is one of the most widely used high-speed switching diodes in the world of electronics. Unlike standard rectifier diodes, the 1N4148 is specifically engineered for ultra-fast response times, making it essential for processing high-frequency digital signals and protecting sensitive logic gates. Housed in a compact, transparent DO-35 glass package, it offers reliable performance in a tiny footprint. Whether used in high-speed computers, telecommunications equipment, or simple hobbyist breadboard projects, the 1N4148 provides the perfect balance of speed, voltage handling, and cost-effectiveness.

Key Features

Ultra-Fast Switching Speed: With a recovery time of just 4 nanoseconds, it can handle high-frequency signals that would cause standard diodes to fail.
Compact Glass Construction: The DO-35 axial package is lightweight and heat-resistant, fitting easily into dense circuit board layouts.
High Reliability: Proven over decades of use in industrial and consumer electronics for consistent performance.
Low Junction Capacitance: Minimizes signal distortion, which is critical for maintaining "clean" pulses in digital communication.
Wide Operating Range: Capable of functioning in extreme temperatures ranging from -65°C to +175°C.

Technical Details

Mounting Style: Through-hole (Axial).
Polarity: Cathode indicated by a black band on the glass body.
Maximum Reverse Recovery Time: 4.0 ns.

Prototyping and Engineering Tips from Robogears

Signal Processing: This diode is perfect for "clipping" or "clamping" signals. If you are feeding an analog signal into an Arduino pin, use a 1N4148 to ensure the voltage never exceeds 5V, protecting the microcontroller from damage.
Logic Gates: You can build simple "AND" or "OR" logic gates using just a few 1N4148 diodes and a resistor. Because of their speed, these DIY gates work perfectly even at high clock speeds.
Reverse Polarity Protection: While this diode can protect against reversed batteries, remember its 300mA limit. For high-current motors, use the 1N4007 or 1N5408 instead.
The "Glass Package" Caution: Be careful when bending the leads. If you bend them too close to the glass body without supporting them with pliers, the glass can crack, leading to air ingress and eventual diode failure.
Identifying the Cathode: CRITICAL: Always look for the black ring. Current only flows from the unmarked side (Anode) toward the black ring side (Cathode). Installing it backward in a signal path will block all data.

Package Includes

5 x 1N4148 Small Signal Fast Switching Diodes

Disclaimer: This diode is intended for small signals and low-current applications. Do not use it as a power rectifier for AC mains. Always verify the current requirements of your circuit to stay within the 300mA peak limit. High-temperature soldering for extended periods can damage the internal silicon junction; limit soldering time to under 3 seconds per lead.