1N4989US

Single Zener Diodes Overview

The Microchip Technology 1N4989US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 200 V and a maximum power dissipation of 5 W. It operates within a junction temperature range of -65°C to +175°C. The device features a standard voltage tolerance of ±5% and a test current (IZT) of 5 mA. Maximum reverse leakage current is specified at 2 µA, while the dynamic impedance (ZZT) reaches 500 Ohms. The component utilizes a voidless hermetically sealed glass package.

Single Zener Diodes Feature Summary

• Military qualified to MIL-PRF-19500/356 for high-reliability applications
• Voidless hermetically sealed glass construction with internal metallurgical bonds
• Triple-layer passivation for enhanced robustness
• Inherently radiation hard

Single Zener Diodes Applications

• High-reliability aerospace systems
• Defense electronics requiring failure-intolerant components
• Harsh environment voltage regulation
• Radiation-hardened circuit protection

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required military qualification standards and package type. Confirm compliance with material declarations and environmental directives relevant to the procurement region. Ensure the ordering suffix aligns with the desired tolerance or packaging configuration. Validate supplier authenticity due to the specialized nature of this component.

Single Zener Diodes Selection Notes

Select this component when a 200 V Zener diode is required in a surface mount format. Consider the 5 W power rating and wide operating temperature range for demanding environments. Verify that the 500 Ohm dynamic impedance meets the circuit's noise and regulation requirements. Ensure the D-5B footprint fits the available board space.

Single Zener Diodes Part Context

This device belongs to the 1N4954US through 1N4996US series of surface mount Zener regulators. These components are designed as industry-standard replacements for axial-leaded versions, offering equivalent electrical performance in a compact form factor suitable for automated assembly processes.

Single Zener Diodes Replacement Considerations

JAN1N4989US

Single Zener Diodes FAQ

What is the maximum continuous current for the 1N4989US?

The maximum continuous regulator current (IZM) is 23.6 mA.

How is polarity indicated on the 1N4989US package?

Polarity is indicated by a band on the cathode end of the device.