SMAJ4478E3/TR13

Single Zener Diodes Overview

The SMAJ4478E3/TR13 is a 1.5 Watt Zener Diode manufactured by Microsemi Corporation, belonging to the SMAJ4460 through SMAJ4496 series. It features a nominal Zener voltage of 36 Volts with a test current of 7.0 mA and a maximum dynamic impedance of 27 Ohms. The device utilizes a DO-214AC (SMAJ) surface mount package and operates within a temperature range of -55°C to +150°C. It provides steady-state power dissipation of 1.5 Watts, derating to zero at 150°C, and includes stress-relief J-bend contacts for thermal efficiency.

Single Zener Diodes Feature Summary

• Metallurgically bonded construction with stress-relief J-bend contacts for improved handling and strain relief
• Thermally efficient design that lowers junction temperatures and extends operating ranges before derating begins
• Provides superior surge quality protection against ESD per IEC61000-4-2 and EFT transients per IEC61000-4-4

Single Zener Diodes Applications

• High reliability voltage regulation in low profile surface mount locations requiring easy placement
• Airborne or satellite applications due to lightweight plastic encapsulation
• Protection from ESD and EFT transients in electronic circuits

Single Zener Diodes Procurement Notes

Verify the specific part number SMAJ4478E3/TR13 against official Microsemi documentation to confirm RoHS compliance indicated by the e3 suffix. Ensure the ordering quantity aligns with the standard tape and reel packaging specifications found in the datasheet. Cross-reference the manufacturer's latest product change notices to verify current production status and availability.

Single Zener Diodes Selection Notes

Select this component when a 36 Volt Zener reference is required in a surface mount configuration. The SMAJ package offers a lower profile compared to MELF styles while providing double the surge performance of previous generations. Consider the 1.5 Watt power rating and the specific dynamic impedance characteristics for precision voltage regulation needs.

Single Zener Diodes Part Context

This component belongs to the SMAJ4460 thru SMAJ4496 series of 1.5 Watt Zener Diodes produced by Microsemi's Scottsdale Division. The series meets or exceeds the electrical performance of the 1N4460 thru 1N4496 discrete diodes. The 'e3' suffix denotes RoHS compliant devices with matte-tin plating, and the '/TR13' indicates tape and reel packaging.

Single Zener Diodes Replacement Considerations

The SMAJ4478E3/TR13 is functionally equivalent to the through-hole 1N4478 diode. For direct replacements within the same package family, consult the SMAJ4460-SMAJ4496 datasheet for other voltage options.