1N4989US/TR

Single Zener Diodes Overview

The Microchip Technology 1N4989US/TR is a surface mount Zener Voltage Regulator with a nominal voltage of 200 V and a test current of 5 mA. It features a maximum dynamic impedance of 500 Ohms at the test point and 1850 Ohms at the knee current. The device has a maximum reverse leakage current of 2 µA at 152 V and a temperature coefficient of 0.110 %/°C. Maximum continuous current is 23.6 mA, with a surge current rating of 0.50 A. Power dissipation is rated at 5 Watts at an ambient temperature of 140°C, derating linearly to zero at 175°C.

Single Zener Diodes Feature Summary

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

Single Zener Diodes Applications

• High-reliability electronic systems where failure cannot be tolerated
• Voltage regulation over broad operating current and temperature ranges
• Radiation-hardened circuit designs

Single Zener Diodes Procurement Notes

Verify that the ordering suffix matches the required package type and tolerance. Confirm military qualification requirements against specific project standards. Check datasheet revisions for updated electrical characteristics. Ensure thermal management aligns with the specified power dissipation and derating curves. Validate compatibility with existing board layouts regarding the E-MELF footprint.

Single Zener Diodes Selection Notes

Select this component for applications requiring a 200 V Zener reference in a surface mount form factor. Consider the 5 Watt power handling capability and wide operating temperature range from -65°C to +175°C. Evaluate the high dynamic impedance for suitability in precision regulation tasks. Compare against axial-leaded equivalents if through-hole mounting is preferred.

Single Zener Diodes Part Context

This part belongs to the 1N4954US thru 1N4996US series of 5 Watt glass Zener diodes. These devices are industry-recognized regulators available in standard 5% tolerances. The series offers extensive voltage selections from 3.3 to 390 volts. Tighter tolerances are available via specific suffix letters on the part number.

Single Zener Diodes Replacement Considerations

Axial-leaded equivalents exist by deleting the US suffix, such as 1N4989. Other voltage ratings within the same series may serve as functional substitutes if voltage levels differ.