1N4968US/TR

Single Zener Diodes Overview

The Microchip Technology 1N4968US/TR is a surface mount Zener voltage regulator with a nominal breakdown voltage of 27 V. It operates at a test current (IZT) of 50 mA and features a maximum dynamic impedance of 6 Ohms at IZT, rising to 180 Ohms at the knee current (IZK = 1 mA). The device dissipates up to 5 Watts at an ambient temperature of 140°C, with a thermal resistance of 7°C/W from junction to end cap. It withstands a continuous current of 176 mA and a surge current of 6.0 A for 8.3 ms square waves. The unit exhibits a reverse leakage current of 2 µA at 20.6 V and maintains a voltage tolerance of ±5%.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless-glass construction utilizing internal metallurgical bonds for high reliability
• Military qualification compliant with MIL-PRF-19500/356 standards
• Robust physical design resistant to electrostatic discharge per MIL-STD-750 Method 1020
• Inherently radiation hard characteristics suitable for demanding environments

Single Zener Diodes Applications

• High-reliability military electronic systems
• Voltage regulation circuits where failure is not tolerated
• Power supply protection and reference applications

Single Zener Diodes Procurement Notes

Verify that the specific part number suffix matches the required package style and tape-and-reel configuration. Confirm compliance with environmental directives such as RoHS or REACH status directly through manufacturer documentation. Ensure the ordering information aligns with the correct military qualification level if applicable. Cross-reference datasheet revisions to confirm electrical parameters remain consistent with system requirements.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed surface mount Zener diode is required for critical applications. The 5-watt power rating supports substantial current handling in compact packages. Verify that the 27 V breakdown voltage aligns with circuit design needs. Consider the wide operating temperature range and radiation hardness for aerospace or defense deployments.

Single Zener Diodes Part Context

This device belongs to the industry-recognized 1N49xxUS series of 5-watt glass Zener regulators. It shares the same voidless hermetic package and metallurgical bond technology as related parts like the 1N4966US and 1N4967US. The series offers extensive voltage selections ranging from 3.3 to 390 volts with standard 5% tolerances.

Single Zener Diodes Replacement Considerations

Equivalent axial-leaded versions exist within the same family, identified by removing the US suffix (e.g., 1N4968). Other manufacturers produce similar 5-watt Zener diodes, but direct substitution requires verifying hermetic sealing and military qualification requirements.