1N4728 G

Overview

The Microsemi Corporation 1N4728G is a silicon unidirectional Zener voltage regulator diode designed for general-purpose regulation applications. It features a nominal Zener voltage of 3.3V with a tolerance of 5%. The device is rated for a maximum power dissipation of 1W and operates within a temperature range of -65°C to 150°C. It utilizes a hermetically sealed glass DO-204AL (DO-41) axial leaded package, providing isolation between the component body and the circuit ground.

Feature Summary

• Hermetically sealed glass encapsulation ensures environmental protection and reliability in harsh conditions.
• Metallurgically bonded construction provides mechanical stability and thermal performance superior to plastic alternatives.
• Oxide passivated die protects the internal junction against corrosion and physical damage.

Applications

• Voltage regulation in power supply circuits
• Overvoltage protection for sensitive electronic components
• Reference voltage generation in analog signal processing

Procurement Notes

Verify that the specific part number suffix matches the required hermetic sealing and package type. Confirm RoHS compliance status if restricted substances are prohibited in the target assembly. Ensure the supplier provides traceability documentation for military or aerospace screening levels if applicable.

Selection Notes

Select this component when high reliability and hermetic sealing are required for a 3.3V regulation point. The glass DO-41 package offers better thermal resistance than plastic equivalents. Consider tighter tolerance variants if the standard 5% specification does not meet circuit requirements.

Part Context

This component belongs to the 1N47xx series of 1-watt silicon Zener diodes manufactured by Microsemi. The 'G' suffix specifically denotes the glass-body variant, which is distinct from the plastic-bodied 'P' suffix options within the same JEDEC numbering system. This series covers a wide voltage range from 3.3V to 100V.

Replacement Considerations

Equivalent parts include the Motorola/NXP 1N4728A and the Microchip 1N4728AG. Verify pinout compatibility and ensure the replacement maintains the hermetic seal requirement if operating in extreme environments.