1N4729AG

Overview

The Microsemi Corporation 1N4729AG is a silicon planar power Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 3.6 V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 1 W at ambient temperature and operates within a junction temperature range of -65°C to +175°C. Packaged in the hermetically sealed DO-41 glass axial leaded case, it utilizes double slug construction for high reliability. Key electrical characteristics include a maximum reverse leakage current of 100 nA at the rated voltage and a Zener impedance of 25 Ohms measured at a test current of 10.5 mA.

Feature Summary

• Hermetically sealed glass construction using metallurgically bonded double slug design
• Voltage regulation capability across a broad range from 3.3 to 100 volts
• High temperature stability suitable for demanding operating environments
• Corrosion-resistant external surfaces with readily solderable leads

Applications

• Precision voltage reference circuits requiring stable regulation
• Overvoltage protection stages in sensitive electronic systems
• Clipping and waveform shaping circuits
• Power supply output regulation modules

Procurement Notes

Verify the specific manufacturer designation as Microsemi or its successor entities, given historical corporate acquisitions affecting product lines. Confirm that the DO-41 package matches the required mechanical footprint for the target assembly. Ensure compliance with relevant environmental directives if applicable to the end-use region. Check for any obsolescence notices or lifecycle status updates directly from the supplier before finalizing procurement plans.

Selection Notes

Select this component when a robust, hermetically sealed axial leaded Zener diode is required for high-reliability applications. The 1W power rating supports moderate current handling capabilities compared to smaller signal variants. The 3.6V nominal voltage makes it suitable for low-voltage regulation tasks. Consider the thermal management requirements associated with the 1W dissipation rating during continuous operation.

Part Context

The 1N4729AG belongs to the standard 1N47xx series of power Zener diodes, widely recognized for their use in general-purpose voltage regulation. This specific part number denotes the 3.6V variant within the series, distinguished by its AG suffix indicating specific testing or packaging attributes defined by the manufacturer. The series is characterized by its durability and consistent performance in industrial and commercial electronics.

Replacement Considerations

Compatible substitutes include the 1N4729A from other manufacturers such as Microchip Technology or NXP, provided they meet the same 3.6V, 1W, and DO-41 specifications. Verify that alternative sources offer equivalent hermetic sealing and electrical parameters like Zener impedance and leakage current to ensure circuit compatibility.