1N4448WT

Overview

The onsemi 1N4448WT is a high-conductance fast switching diode designed for surface-mount applications. It features an extremely small SOD-523F plastic package with flat leads, ensuring a profile height below 0.70 mm. The device utilizes silicon epitaxial planar technology and offers a reverse recovery time of less than 4.0 ns. Key electrical ratings include a maximum repetitive peak reverse voltage of 75 V and a non-repetitive peak forward surge current of 300 mA. The component supports a wide operating junction temperature range from -55 °C to +150 °C and maintains a power dissipation capacity of 200 mW at 25 °C case temperature.

Feature Summary

• Fast switching capability with reverse recovery time under 4.0 ns for efficient signal processing in high-frequency circuits.
• Compact SOD-523F surface-mount package with flat leads and low profile, optimizing board space utilization.
• High thermal stability supporting operation up to 150 °C junction temperature.
• RoHS compliant construction with matte tin lead finish and green mold compound.

Applications

• High-speed communication circuits requiring rapid signal response.
• High-frequency oscillators demanding minimal signal delay.
• General-purpose switching applications in space-constrained electronic designs.

Procurement Notes

Verify the specific manufacturer designation when sourcing, as multiple vendors produce variants under this model number. Confirm that the received components match the SOD-523F package dimensions and RoHS compliance status required by your assembly specifications. Ensure storage conditions adhere to the moisture sensitivity level 1 rating to prevent damage during soldering processes.

Selection Notes

Select this component when design constraints require a miniature footprint combined with fast switching performance. The SOD-523F package is suitable for automated insertion and high-density PCB layouts. Consider the 75 V reverse voltage rating to ensure adequate margin for the intended circuit's peak inverse voltage requirements.

Part Context

This part belongs to the family of general-purpose silicon switching diodes derived from the standard 1N4148 specification. While traditional versions utilize axial DO-35 packages, the WT suffix denotes a surface-mount variant optimized for modern manufacturing techniques. These devices serve as fundamental building blocks for rectification and signal clipping tasks in consumer and industrial electronics.

Replacement Considerations

Direct substitutes include other manufacturers' 1N4448WT equivalents such as those from Diodes Inc. or Rectron, provided they maintain the SOD-523F package and identical electrical characteristics. Verify pinout compatibility and thermal resistance values before implementation.