1N4989CUS/TR

Single Zener Diodes Overview

The Microchip Technology 1N4989CUS/TR is a surface mount Zener voltage regulator with a nominal breakdown voltage of 200 V and a test current of 5 mA. It features a tight voltage tolerance of ±2%, indicated by the 'C' suffix, and operates within a temperature range of -65°C to +175°C. The device utilizes a voidless hermetically sealed glass package (E Package/D-5B) with tungsten slugs and copper end caps. It supports a maximum power dissipation of 5 Watts at an ambient temperature of 140°C and includes internal Category I metallurgical bonds.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless-glass construction with internal metallurgical bonds for high reliability
• Military qualification per MIL-PRF-19500/356 standards
• Inherently radiation hard and non-sensitive to electrostatic discharge
• Triple-layer passivation for robust protection

Single Zener Diodes Applications

• High-reliability military applications where failure cannot be tolerated
• Radiation-hardened electronic systems
• Voltage regulation in extreme temperature environments

Single Zener Diodes Procurement Notes

Verify that the ordering suffix matches the required specifications. The 'US' suffix indicates the surface mount D-5B package, while the 'C' suffix confirms the ±2% voltage tolerance. Confirm the tape and reel packaging option aligns with EIA-481-B standards before procurement. Ensure the component meets the specific military qualification requirements of MIL-PRF-19500/356.

Single Zener Diodes Selection Notes

Select this component when a 200 V Zener diode with ±2% tolerance is required for surface mount assembly. The D-5B package is suitable for applications needing high thermal stability and radiation hardness. Consider the 5W power rating and the operating temperature range up to 175°C for harsh environment designs. Verify compatibility with existing board layouts due to the specific pad dimensions of the E Package.

Single Zener Diodes Part Context

This part belongs to the 1N4954US through 1N4996US series of 5-watt surface mount Zener regulators. These devices are designed for critical applications requiring high reliability and robust construction. The series offers a wide selection of voltages from 3.3V to 390V with various tolerance options. The 1N4989CUS/TR specifically provides a 200V regulation point with tighter precision than standard variants.

Single Zener Diodes Replacement Considerations

Equivalent axial-leaded versions exist as 1N4989 without the US suffix. Other parts in the series offer different voltage ratings but share similar package and qualification characteristics.