1N4744A

Overview

The SMC Diode Solutions 1N4744A is a silicon planar Zener diode designed for voltage regulation and reference applications. It features a DO-41 axial leaded package suitable for through-hole mounting. The device provides a nominal Zener voltage of 15 V with a tolerance of ±5%. It supports a maximum power dissipation of 1 W at ambient temperatures up to +75°C, derating linearly above this threshold. Key electrical characteristics include a test current of 17 mA, a maximum reverse leakage current of 5 µA at rated voltage, and a Zener impedance of 14 Ω. The component operates within a junction temperature range of -65°C to +175°C.

Feature Summary

• Provides stable voltage regulation using a silicon planar epitaxial structure.
• Features low leakage current for efficient performance in reference circuits.
• Utilizes an axial glass-passivated package for robust mechanical stability.

Applications

• Voltage regulation in power supply circuits
• Voltage reference sources in measurement equipment
• Overvoltage protection in electronic systems

Procurement Notes

Verify the specific manufacturer designation on the component marking to confirm SMC Diode Solutions origin, as the 1N4744A is a JEDEC standard part produced by multiple vendors. Ensure the procurement documentation explicitly lists SMC Diode Solutions as the manufacturer to avoid substitution with generic equivalents that may have different quality control or material specifications. Cross-reference the datasheet revision date to ensure compliance with current environmental standards.

Selection Notes

Select this component when a standard 15 V regulation point is required in through-hole designs. Consider the 1 W power rating and thermal derating requirements for the specific enclosure environment. Verify that the 14 Ω impedance meets the noise and stability requirements of the application. Compare against alternative manufacturers if supply chain constraints exist, ensuring pinout and package dimensions remain compatible with existing PCB layouts.

Part Context

The 1N4744A belongs to the widely used 1N47xx series of Zener diodes, which are standardized across the semiconductor industry. This series is characterized by its reliability in general-purpose voltage regulation tasks. SMC Diode Solutions manufactures this part to meet the electrical specifications defined by the JEDEC outline, ensuring interchangeability with other major suppliers while maintaining specific quality attributes associated with their production lines.

Replacement Considerations

Direct replacements include Vishay 1N4744A, Microchip 1N4744A, and Central Semiconductor 1N4744A BK PBFREE. These parts share identical electrical parameters and DO-41 packaging. Verify that any substitute maintains the same 5% voltage tolerance and 1 W power rating to ensure circuit compatibility without redesign.