SMAJ6491E3/TR13

Single Zener Diodes Overview

The SMAJ6491E3/TR13 is a 1.5-watt Zener diode manufactured by Microsemi Corporation, housed in the DO-214AC (SMAJ) surface-mount package. It provides a nominal Zener voltage of 5.6 volts with a test current of 45.0 mA and a maximum dynamic impedance of 600 ohms. The device features a knee impedance of 0.50 ohms at a test current of 1.0 mA and a maximum reverse leakage current of 2.0 µA at 5.0 volts. It supports a maximum continuous surge current of 255 mA at 25°C and operates within a temperature range of -55°C to +150°C.

Single Zener Diodes Feature Summary

• Provides superior surge protection against ESD and electrical fast transients using a larger active die element for double the overall surge performance compared to standard equivalents.
• Features a thermally efficient design with stress-relief J-bend contacts that lower junction temperatures and extend the operating temperature range before derating begins.
• Offers high reliability through metallurgical bonding and compliance with rigorous screening standards including MIL-PRF-19500/406 options.

Single Zener Diodes Applications

• High-reliability voltage regulation in low-profile surface mount locations requiring easy placement and strain relief
• Airborne or satellite applications where lightweight components are required
• Protection from ESD and EFT transients per IEC61000-4-2 and -4-4

Single Zener Diodes Procurement Notes

Verify the specific suffix 'e3' confirms RoHS compliance and matte-tin plating as documented in the datasheet. Confirm the 'TR13' designation aligns with the specified tape and reel packaging containing 2500 units per reel on a 13-inch diameter spool. Ensure the part number matches the exact SMAJ6491 variant to guarantee the correct 5.6V specification and tolerance.

Single Zener Diodes Selection Notes

Select this component when a 1.5-watt surface-mount Zener diode is needed for precise voltage regulation in space-constrained designs. The DO-214AC package offers a low-profile form factor suitable for automated handling. Consider the thermal resistance of 15 °C/W and power derating characteristics if operating near the upper temperature limits.

Single Zener Diodes Part Context

This device belongs to the SMAJ6485 thru SMAJ6491 series of 1.5-watt Zener diodes. It serves as a surface-mount equivalent to the axial-leaded 1N6485 thru 1N6491 series, providing comparable electrical performance in a smaller footprint. The series covers Zener voltages ranging from 3.3 volts to 200 volts.

Single Zener Diodes Replacement Considerations

The SMAJ6491E3/TR13 is electrically equivalent to the SMAJ4491 series and the axial 1N6491. Verify pinout compatibility and thermal requirements when substituting with other SMAJ series variants.