1N4969US

Single Zener Diodes Overview

The Microchip Technology 1N4969US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 30 V. It operates at a test current of 40 mA and features a maximum dynamic impedance of 8 Ohms at this point, rising to 2.5 Ohms at a knee current of 1 mA. The device handles a maximum continuous current of 158 mA and supports surge currents up to 5.5 A for an 8.3 ms square wave pulse. It dissipates 5 Watts of power at an ambient temperature of 125°C, derating linearly to zero at 175°C. The unit exhibits a reverse leakage current of 2 µA at 22.8 V and maintains a forward voltage of 1.5 V at 1.0 A.

Single Zener Diodes Feature Summary

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

Single Zener Diodes Applications

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

Single Zener Diodes Procurement Notes

Verify the specific revision level and manufacturing origin against the latest datasheet before procurement. Confirm that the supplier provides traceability documentation required for military or space-grade contracts. Ensure the ordering suffix matches the exact tolerance and package requirements specified in the design. Check for any recent packaging label changes or assembly site notifications that may affect compliance status.

Single Zener Diodes Selection Notes

Select the 1N4969US when a 30 V regulation point is required in a surface mount form factor. This component is suitable for designs needing robust thermal performance up to 175°C junction temperature. Consider the 5 W power dissipation capability and the specific thermal resistance values for heat sinking calculations. Verify that the 8 Ohm dynamic impedance meets the noise and stability requirements of the target application circuit.

Single Zener Diodes Part Context

This component belongs to the 1N4954US through 1N4996US series of 5 Watt glass Zener diodes manufactured by Microsemi, now part of Microchip Technology. These devices are designed for demanding environments where standard commercial parts would fail. The series offers a wide range of voltage options from 3.3 V to 390 V, all sharing the same hermetic voidless-glass package construction.

Single Zener Diodes Replacement Considerations

Axial-leaded equivalents such as the 1N4969 are available for through-hole mounting. Other voltage variants within the 1N4954US-1N4996US series share identical packaging and reliability characteristics.