1N4733AP/TR12

Overview

The Microchip Technology 1N4733AP/TR12 is a silicon 1.0-watt Zener diode in the 1N4728AP through 1N4764AP series, housed in a plastic DO-41 or DO-204AL axial lead package. It provides voltage regulation with a nominal Zener voltage of 5.1 V and a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +150°C and features flexible mounting terminals. Electrical characteristics include a maximum dynamic impedance of 7 Ohms at a test current of 49 mA, a maximum reverse current of 10 µA, and a forward voltage of 1.2 V maximum at 200 mA.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for standard circuit 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 in power supply circuits
• Reference voltage generation in electronic systems
• Overvoltage protection applications

Procurement Notes

Verify that the ordering suffix TR12 corresponds to the tape and reel packaging option described in the datasheet as adding a TR suffix. Confirm RoHS compliance status by checking for the e3 suffix if required, as standard devices may use tin-lead plating. Ensure the specific manufacturer designation aligns with current Microchip Technology documentation, noting historical references to Microsemi Scottsdale Division.

Selection Notes

Select this component when a 5.1 V regulated voltage is required with a 1.0-watt power dissipation capability. The plastic encapsulation offers lower thermal resistance compared to glass-body options. Consider the ±5% tolerance suitable for general-purpose applications. Verify thermal derating requirements based on the intended ambient temperature and mounting configuration on FR4 PCBs.

Part Context

This part belongs to the JEDEC registered 1N4728A to 1N4764A series of 1.0-watt Zener diodes. The series covers a voltage selection from 3.3 to 100 volts. The AP designation indicates a plastic construction variant. Surface mount equivalents are available in SMAJ and MLL packages for designs requiring alternative form factors.

Replacement Considerations

Surface mount equivalents such as SMAJ4733A or MLL4733A are available from the same manufacturer family. Glass-body variants designated with a G suffix exist but exhibit higher thermal resistance.