1N4733 G

Overview

The Microsemi Corporation 1N4733 G is a silicon planar power Zener diode housed in a hermetically sealed glass DO-35 axial leaded package. It provides a nominal Zener voltage of 5.1 V with a standard tolerance of 5%. The device is rated for a steady-state power dissipation of 0.5 W at 25°C ambient temperature. Key electrical parameters include a maximum reverse leakage current of 5 µA and a Zener impedance of 7 Ω at the test current of 49 mA. The component supports an operating junction temperature range from -65°C to +175°C.

Feature Summary

• Hermetically sealed glass body construction ensures reliability in harsh environments
• Silicon planar technology provides stable voltage regulation characteristics
• Axial leaded DO-35 package facilitates flexible mounting options

Applications

• Voltage regulation circuits requiring high reliability
• Reference voltage sources in precision instrumentation
• Overvoltage protection stages in sensitive electronic systems

Procurement Notes

Verify that the specific part number includes the 'G' suffix, which denotes the glass package variant. Confirm RoHS compliance status as historical Microsemi documentation indicates this specific configuration may not be compliant. Ensure the supplier provides valid traceability data for the hermetic seal integrity given the military heritage of the DO-35 glass package style.

Selection Notes

Select this component when a hermetically sealed glass package is required for environmental protection rather than plastic encapsulation. Compare thermal resistance values against plastic equivalents like the 1N4733AP if higher thermal efficiency is needed. Verify that the 0.5 W power rating meets the application's peak dissipation requirements without excessive derating.

Part Context

This device belongs to the broader family of 1 Watt Zener Diodes produced by Microsemi, specifically utilizing the lower power DO-35 form factor. While the series spans voltages from 3.3 V to 100 V, the 1N4733 G represents the 5.1 V node within the standard 5% tolerance range. It serves as a legacy alternative to modern surface mount regulators where through-hole glass sealing is mandated.

Replacement Considerations

Equivalent parts include the 1N4733A from other manufacturers using the same JEDEC outline. For hermetic requirements, check availability of MQ1N4733AGTR variants. Plastic alternatives such as 1N4733AP offer similar electrical performance but lack the hermetic seal.