1N4733E3/TR13

Overview

The Microchip Technology 1N4733E3/TR13 is a silicon 1-watt Zener diode in the 1N4728AP through 1N4764AP series, housed in a plastic DO-41 (DO-204AL) axial-lead package. It features a nominal Zener voltage of 5.1 V with a standard ±5% tolerance and a test current of 49 mA. The device exhibits a maximum dynamic impedance of 7 ohms at the test current and a maximum reverse leakage current of 1 µA at 10 V. Rated for power dissipation up to 1.0 watt at 25°C lead temperature, it operates within a junction-to-ambient thermal resistance of 105°C/W on FR4 PCBs. The component is RoHS compliant, moisture classified as Level 1, and supplied in tape and reel packaging.

Feature Summary

• Provides voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for standard through-hole integration
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Applications

• Voltage regulation circuits requiring stable reference voltages
• Power supply protection against overvoltage conditions
• Clamping applications for transient voltage suppression

Procurement Notes

Verify that the ordering suffix matches the required specifications: 'e3' indicates RoHS compliance, 'P' denotes the plastic DO-41 package, and 'TR13' specifies the tape and reel quantity. Confirm the manufacturer source is Microsemi or its authorized successor entity, Microchip Technology, to ensure authenticity. Check datasheet revisions for any updates to electrical characteristics or mechanical dimensions before finalizing procurement orders.

Selection Notes

Select this component when a 5.1 V regulated output is needed with a 1-watt power handling capability in an axial-lead form factor. Ensure the application environment stays within the -65°C to +150°C operating temperature range. Consider the 7-ohm dynamic impedance for ripple rejection requirements. Verify that the PCB copper pad layout supports the specified thermal resistance values for adequate heat dissipation during steady-state operation.

Part Context

This part belongs to the widely used 1N47xx series of silicon Zener diodes, specifically the plastic encapsulated variants designated by the 'AP' suffix in the base family. The 'e3' suffix confirms environmental compliance, while 'TR13' identifies the specific bulk packaging format for automated assembly. These devices are JEDEC registered and serve as standard components for general-purpose voltage regulation tasks in industrial and commercial electronics.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4733A diodes in DO-41 packages. Surface mount alternatives in the same voltage class are SMAJ4733A or MLL4733A. When substituting, verify that the replacement meets the same 1-watt power rating, 5.1 V nominal voltage, and ±5% tolerance specifications.