1N4749 G

Overview

The 1N4749 G is a Zener Voltage Regulator Diode manufactured by Microsemi Corporation. It features a nominal Zener voltage of 24 V with a power dissipation rating of 1 W. The device utilizes a glass axial-leaded DO-35 package and operates within a temperature range of -65 °C to +175 °C. Key electrical characteristics include a maximum dynamic impedance of 25 Ω, a test current of 10.5 mA, and a maximum reverse leakage current of 100 nA. The component is classified as non-RoHS compliant.

Feature Summary

• Provides stable voltage regulation in a hermetically sealed glass body package
• Features internal metallurgical bonding for high reliability applications
• Operates effectively across an extended industrial temperature range

Applications

• Low voltage stabilizers
• Voltage reference circuits
• Protection against overvoltage transients

Procurement Notes

Verify the specific suffix requirements for your application, as the 'G' designation indicates a glass body construction which differs from plastic encapsulated variants. Confirm RoHS compliance status if environmental regulations apply, as this specific part number is listed as non-compliant. Ensure the procurement channel sources directly from authorized distributors to guarantee authenticity and traceability for high-reliability uses.

Selection Notes

Select this component when a 24 V regulation point is required in a compact axial package. The glass construction offers superior thermal performance compared to plastic equivalents. Consider the 1 W power rating and 25 Ω impedance for circuit design calculations. Verify that the operating environment does not require lead-free soldering compatibility due to the non-RoHS status.

Part Context

This diode belongs to the standard JEDEC registered 1N47xx series of Zener regulators. It shares the same electrical profile as other manufacturers' 1N4749 parts but adheres to Microsemi's specific manufacturing standards for hermetic sealing and metallurgical bonding. It serves as a direct replacement for legacy designs requiring robust voltage regulation in small form factors.

Replacement Considerations

Equivalent parts include the 1N4749A from other manufacturers such as NXP or onsemi. For surface mount needs, consider MELF packages like the 1N4749UR-1E3, though pinout and mounting differences must be addressed.