1N4983US/TR

Single Zener Diodes Overview

The Microchip Technology 1N4983US/TR is a surface mount, voidless-hermetically-sealed 5-watt glass Zener voltage regulator. It belongs to the military-qualified 1N4954US through 1N4996US series, compliant with MIL-PRF-19500/356. The device features an internal metallurgical bond and triple-layer passivation. Key electrical parameters at 25°C include a nominal Zener voltage of 110 V at a test current of 12 mA, a maximum dynamic impedance of 125 ohms at IZT and 1000 ohms at IZK=1mA, and a maximum reverse leakage current of 2 µA at 110 V. The temperature coefficient is +0.100 %/°C. Maximum continuous current is 43.0 mA, with a surge current capability of 1.2 A for an 8.3 ms square wave.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless hard glass package with tungsten slugs for high-reliability applications
• Internal Category I metallurgical bonds ensuring robust construction
• Triple-layer passivation providing protection against environmental stressors
• Non-sensitive to electrostatic discharge (ESD) per MIL-STD-750 Method 1020

Single Zener Diodes Applications

• High-reliability aerospace and defense systems where failure cannot be tolerated
• Military-grade power supply regulation circuits
• Radiation-hardened electronic environments
• Critical voltage reference applications in harsh thermal conditions

Single Zener Diodes Procurement Notes

Verify that the ordered component matches the specific part number 1N4983US/TR to ensure correct voltage rating and tolerance. Confirm the presence of the "US" suffix indicates the surface mount E-package variant. Check for any additional ordering suffixes such as C or D if tighter voltage tolerances are required, as these alter the electrical specifications. Ensure the supplier provides documentation confirming compliance with MIL-PRF-19500/356 for military qualification requirements.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed, surface-mount Zener diode with 5-watt power dissipation is required. It is suitable for designs operating between -65°C and +175°C junction temperature. Choose this part over axial-leaded equivalents when board space constraints necessitate a surface mount footprint. Consider the specific Zener voltage and tolerance requirements, noting that standard 5% tolerance is available without suffixes, while tighter tolerances require specific letter codes.

Single Zener Diodes Part Context

This component is part of the broader 1N4954US through 1N4996US series of 5-watt Zener regulators manufactured by Microsemi's Scottsdale Division. These devices share common mechanical and packaging characteristics, including the voidless-glass construction and JEDEC registration. The series offers a wide range of Zener voltages from 3.3 V to 390 V, allowing designers to select appropriate voltage ratings while maintaining consistent reliability standards across the product line.

Single Zener Diodes Replacement Considerations

Axial-leaded equivalents such as 1N4983 are available by deleting the "US" suffix, but they differ in mounting style and potentially thermal performance. Direct surface-mount replacements from other manufacturers may not offer identical hermetic sealing or military qualification. Verify pinout compatibility and thermal resistance values when substituting with non-Microsemi parts.