1N4148WS High-Speed Switching Diode (75V, 350mA, SOD-323)

The 1N4148WS is the modern, ultra-compact surface-mount version of the legendary 1N4148—arguably the most famous and widely used switching diode in the world. When you need to process digital signals, build custom diode logic gates, or protect a microcontroller's GPIO pin from the inductive kickback of a micro-relay, this is the absolute standard "go-to" component. Its defining characteristic is its incredibly fast reverse recovery time (typically around 4 nanoseconds), making it perfect for high-frequency signal processing and fast-acting protective clamping.

Rated for a maximum reverse voltage of 75V and capable of handling peak forward currents up to 350mA, it provides reliable performance for almost any low-power DIY electronic circuit. Housed in the microscopic SOD-323 surface-mount package, it takes up a fraction of the space of the classic glass through-hole version. Whether you are designing compact IoT sensor nodes, Arduino shields, or custom audio clipping circuits, having a reel of these jellybean components on your workbench is an absolute necessity.

Key Features:

• Blazing Fast Switching: A reverse recovery time of ~4ns ensures crisp, undistorted signal processing in high-frequency digital and analog circuits.

• Micro-Relay Protection: The perfect small-signal flyback diode for safely shunting inductive spikes from small relays and piezo buzzers away from your MCU.

• Versatile Performer: Handles up to 75V reverse voltage and 350mA peak current, making it ideal for general-purpose rectification and logic clamping.

• Microscopic Footprint: The SOD-323 SMD package requires virtually zero PCB space, allowing for ultra-dense component placement in miniaturized electronics.

Specifications:

• Part Number: 1N4148WS (SMD marking usually "T4" or "S1")

• Diode Type: High-Speed Switching / Small Signal Diode

• Max Repetitive Reverse Voltage (Vrrm): 75V

• Max Forward Current (If): 350mA (Peak/Surge), ~150mA (Continuous)

• Package Type: SOD-323 (SMD/SMT)