1N4305

Overview

The Fairchild Semiconductor 1N4305 is a small signal switching diode designed for computer and general-purpose applications. It features a single NPN silicon construction housed in the DO-35-2 axial leaded package. Key electrical parameters include a peak reverse voltage of 75 V, a maximum forward current of 10 mA, and a low junction capacitance of 2 pF. The device exhibits a fast recovery time of 2 ns and operates within a temperature range from -65 °C to +150 °C.

Feature Summary

• Fast switching capability with minimal recovery delay
• Low junction capacitance for high-frequency signal integrity
• Robust thermal performance across extended temperature ranges

Applications

• Computer logic circuits
• High-speed signal switching
• General purpose rectification

Procurement Notes

Verify the specific manufacturer suffix and RoHS compliance status, as multiple vendors produce this standard part number. Confirm the package type matches the required DO-35-2 form factor. Ensure the datasheet aligns with the intended operating voltage and current limits before integration into the final design.

Selection Notes

Select this component when low capacitance and rapid switching are critical requirements. The 75 V reverse voltage rating suits low-voltage digital systems. Verify that the 10 mA forward current limit meets the circuit load demands without exceeding thermal dissipation constraints in the chosen enclosure.

Part Context

This component belongs to the standard 1N series of silicon switching diodes widely used in digital electronics. It serves as a fundamental discrete semiconductor element for signal processing and protection. The DO-35 package provides a compact solution for through-hole mounting on printed circuit boards.

Replacement Considerations

Equivalent parts include the 1N4148 and 1N914. Verify pinout compatibility and ensure the substitute meets the 75 V reverse voltage and 2 ns recovery time specifications.