1N4733CPE3/TR12

Overview

The Microchip Technology 1N4733CPE3/TR12 is a silicon voltage regulator diode in the 1N4728AP through 1N4764AP series. It provides a nominal Zener voltage of 5.1 V with a tight tolerance of +/- 2%, indicated by the 'C' suffix. The device operates at a test current of 49 mA and features a maximum dynamic impedance of 7 Ohms. It dissipates 1.0 W of power within an operating temperature range of -65°C to +150°C. Packaged in a plastic DO-41 axial lead case, it is supplied in tape and reel format.

Feature Summary

• Provides precise voltage regulation with a tight +/- 2% tolerance on the nominal Zener voltage.
• Features flexible axial-lead mounting terminals for standard through-hole integration.
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 flammability ratings.
• RoHS compliant devices are available with an e3 suffix indicating annealed matte-Tin plating.

Applications

• Voltage regulation over broad operating current and temperature ranges
• Reference voltage sources in electronic circuits
• Protection against voltage transients

Procurement Notes

Verify that the specific part number matches the required electrical characteristics, particularly the 5.1 V Zener voltage and the 2% tolerance associated with the C suffix. Confirm the presence of the TR12 suffix indicates the correct tape and reel packaging configuration. Ensure compliance requirements such as RoHS status align with project specifications before finalizing procurement orders.

Selection Notes

Select this component when a stable reference voltage near 5.1 V is required with high precision. The 2% tolerance makes it suitable for applications where tighter voltage accuracy is necessary compared to standard 5% or 10% variants. Consider the 1.0 W power dissipation capability and the thermal resistance values when designing heat management strategies for the circuit layout.

Part Context

This component belongs to the widely used 1N47xx series of 1-watt Zener diodes manufactured by Microsemi (now Microchip). The series covers a voltage selection from 3.3 to 100 volts. The 'P' suffix denotes plastic encapsulation, which offers lower thermal resistance compared to glass-body options. The 'e3' suffix confirms RoHS compliance, while 'TR' specifies tape and reel packaging for automated assembly.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4733A diodes with matching 5.1 V and 2% tolerance specifications. Surface mount equivalents such as SMAJ4733A or MLL4733A are available from the same manufacturer family. Verify that any substitute maintains the required 1.0 W power rating and compatible package dimensions for direct replacement.