1N4733P/TR8

Overview

The Microchip Technology 1N4733P/TR8 is a silicon planar Zener diode in the 1N4728AP through 1N4764AP series, housed in a plastic DO-41 (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 dissipates 1.0 W at 25°C and operates within a temperature range of -65°C to +150°C. 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 at 200 mA. The 'TR8' suffix indicates tape and reel packaging.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for through-hole applications
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Moisture classification is Level 1 per IPC/JEDEC J-STD-020B, requiring no dry pack

Applications

• Voltage reference circuits
• Overvoltage protection
• General-purpose voltage regulation

Procurement Notes

Verify that the ordering suffix matches the required specifications. The 'P' suffix designates the plastic encapsulated construction, while the 'TR8' suffix confirms the component is supplied in tape and reel format. Confirm RoHS compliance status if required by the assembly process, as this depends on the specific manufacturing lot and suffix configuration.

Selection Notes

Select this component when a 5.1 V regulated output is required in an axial lead package. Ensure the application current does not exceed the maximum regulator current of 178 mA. Verify thermal management requirements against the specified junction-to-lead thermal resistance of 45°C/W. Consider the plastic body material properties for environmental exposure compared to glass-sealed alternatives.

Part Context

This part belongs to the JEDEC registered 1N4728A through 1N4764A series of 1.0 Watt Zener diodes. The series offers extensive voltage selection from 3.3 to 100 Volts. The 'P' suffix specifically identifies the plastic molded variant, which provides lower thermal resistance compared to the glass-body options available in the same family.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4733A devices in the DO-41 package. Surface mount equivalents are available as SMAJ4733 or MLL4733.