1N4933

Overview

The Diotec Semiconductor 1N4933 is a fast recovery rectifier diode designed for general-purpose applications. It features an average forward current rating of 1 A and supports peak forward surge currents up to 30 A at 50 Hz or 33 A at 60 Hz. The device offers a maximum repetitive reverse voltage of 50 V with a low forward voltage drop of less than 1.2 V at 1 A. Key electrical characteristics include a reverse recovery time under 200 ns, leakage current below 5 µA at 25°C, and typical junction capacitance of 15 pF. It operates within a junction temperature range of -50°C to +150°C.

Feature Summary

• Fast recovery performance with reverse recovery time under 200 ns
• Low forward voltage drop for efficient power conversion
• High surge current capability for robust operation
• Low leakage current ensuring minimal power loss

Applications

• General purpose rectification in electronic circuits
• Free wheeling diodes in inductive load switching
• Polarity protection circuits
• DC-AC conversion stages

Procurement Notes

Verify the specific manufacturer source when ordering, as multiple vendors produce this standard part number. Confirm compliance with RoHS and ELV directives if required by your project specifications. Ensure the package type matches DO-41 axial lead requirements for your PCB layout. Check datasheet revisions for any updates on thermal resistance values or mechanical dimensions before finalizing component selection.

Selection Notes

Select this component for applications requiring fast switching speeds combined with moderate current handling capabilities. The DO-41 package provides reliable through-hole mounting suitable for standard industrial environments. Consider the thermal derating curve when designing for high ambient temperatures to maintain the 1 A rating. Verify that the 50 V reverse voltage rating aligns with the peak inverse voltage present in your circuit design.

Part Context

This component belongs to the 1N4933...1N4937 series of fast recovery rectifiers manufactured by Diotec Semiconductor AG. These devices are engineered for commercial and industrial grade reliability. The series shares common physical dimensions and basic electrical structures while varying primarily in their maximum repetitive reverse voltage ratings. They are widely used in standard power supply and signal processing applications.

Replacement Considerations

Cross-reference with other manufacturers' 1N4933 equivalents such as Vishay or Rectron versions. Ensure substitute parts meet the same 200 ns reverse recovery time and 1 A forward current specifications. Verify package compatibility with existing DO-41 footprints.