SMAJ4491E3/TR13

Single Zener Diodes Overview

The SMAJ4491E3/TR13 is a 1.5 Watt Zener Diode manufactured by Microsemi Corporation, housed in a DO-214AC (SMAJ) surface mount package. It provides a nominal Zener voltage of 120 Volts with a ±5% tolerance. The device operates within a temperature range of -55°C to +150°C and features a thermal resistance of 15 °C/W. Electrical characteristics include a maximum dynamic impedance of 4500 Ohms at a test current of 400 mA, a reverse leakage current of 25 µA maximum at the test voltage, and a continuous surge current rating of 12 Amperes.

Single Zener Diodes Feature Summary

• Provides superior surge protection against ESD and electrical fast transients per IEC standards
• Features a thermally efficient design with stress-relief J-bend contacts for easier automatic placement
• Utilizes a larger active die element to double overall surge performance compared to standard equivalents

Single Zener Diodes Applications

• High reliability voltage regulation in low profile surface mount locations
• Airborne or satellite applications requiring lightweight components
• Protection from ESD and EFT transients in electronic circuits

Single Zener Diodes Procurement Notes

Verify that the ordering suffix 'e3' confirms RoHS compliance as specified in the datasheet. Confirm the package type matches the required DO-214AC footprint. Ensure the specific part number corresponds to the intended Zener voltage and tolerance requirements for the application.

Single Zener Diodes Selection Notes

Select this component when a 120 Volt Zener diode is required in a surface mount configuration. Consider the 1.5 Watt power dissipation capability and the operating temperature range up to 150°C. The device offers improved mechanical handling due to its flat profile and stress-relief contacts compared to traditional MELF packages.

Single Zener Diodes Part Context

This component belongs to the SMAJ4460 through SMAJ4496 series of 1.5 Watt Zener Diodes. It serves as a surface mount equivalent to the JEDEC registered 1N4491 axial leaded diode. The series is designed to meet or exceed the electrical performance of these legacy components while providing enhanced surge capabilities.

Single Zener Diodes Replacement Considerations

The SMAJ4491E3/TR13 is electrically equivalent to the 1N4491 axial leaded Zener diode. For direct replacement in existing designs, ensure the new surface mount footprint can accommodate the DO-214AC package dimensions.