1N4478US/TR

Single Zener Diodes Overview

The Microchip Technology 1N4478US/TR is a surface mount Zener voltage regulator with a nominal breakdown voltage of 36 V and a maximum power dissipation of 1.5 W. It features a standard tolerance of ±5% and a dynamic impedance of 27 Ohms at the test current of 7 mA. The device operates within a junction temperature range of -65°C to +175°C and utilizes an A (D-5A) SQ-MELF package.

Single Zener Diodes Feature Summary

• Hermetically sealed void-less glass construction using internal metallurgical bonds for robust reliability.
• Military qualification per MIL-PRF-19500/406, suitable for high-reliability applications where failure is not tolerated.
• Inherently radiation hard and non-sensitive to electrostatic discharge.

Single Zener Diodes Applications

• Voltage regulation in broad operating current and temperature ranges
• High-reliability military and aerospace electronic systems
• Radiation-hardened circuit protection

Single Zener Diodes Procurement Notes

Verify that the specific ordering suffix matches the required reliability level and RoHS compliance status. Confirm the package type corresponds to the D-5A MELF form factor. Ensure the requested tolerance aligns with the standard 5% specification unless a tighter variant is explicitly ordered.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed surface mount Zener diode is required for environments demanding high thermal stability and radiation hardness. The 1.5 W power rating supports significant current handling, while the wide operating temperature range ensures functionality across extreme conditions.

Single Zener Diodes Part Context

This part belongs to the 1N4460US through 1N4496US series of industry-recognized 1.5 Watt Zener voltage regulators. The series provides extensive voltage selections from 3.3 to 200 Volts in various tolerance levels, offering a surface mount equivalent to popular JEDEC registered axial-lead series.

Single Zener Diodes Replacement Considerations

Equivalent parts include JAN1N4478CUS, JANTX1N4478CUS, and JANTXV1N4478US.

Single Zener Diodes FAQ

Is the 1N4478US/TR sensitive to electrostatic discharge?

No, the device is non-sensitive to ESD per MIL-STD-750 method 1020.

What is the maximum steady-state power dissipation?

The maximum steady-state power dissipation is 1.5 W at an ambient temperature of 25°C.