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1N4966US/TR
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Product Detailed Parameters
- Description：DIODE ZENER 22V 5W E-MELF
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR),Cut Tape (CT)
- Voltage - Zener (Nom) (Vz)：22 V
- Tolerance：±5%
- Power - Max：5 W
- Impedance (Max) (Zzt)：5 Ohms
- Current - Reverse Leakage @ Vr：2 µA @ 16.7 V
- Operating Temperature：-65°C ~ 175°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：SQ-MELF, E
- Voltage - Forward (Vf) (Max) @ If：1.5 V @ 1 A
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 1N4966US/TR is a surface mount Zener voltage regulator with a nominal breakdown voltage of 22 V at a test current of 50 mA. It features a maximum dynamic impedance of 5.0 Ohms and a reverse leakage current of 2 µA at 16.7 V. The device supports a maximum continuous current of 216 mA and a surge current of 7.0 A. It operates within a junction temperature range of -65°C to +175°C and dissipates up to 5 Watts.
Feature Summary
- Hermetically sealed voidless glass construction with internal metallurgical bonds for high reliability
- Military qualified to MIL-PRF-19500/356 standards
- Inherently radiation hard and non-sensitive to electrostatic discharge
Applications
- High-reliability applications where failure cannot be tolerated
- Voltage regulation over broad operating current and temperature ranges
- Space-grade timing and aerospace systems
Procurement Notes
Verify the specific revision level and manufacturing origin against the latest datasheet before procurement. Confirm that the tape and reel packaging complies with EIA-481-B standards for automated assembly. Ensure compliance with relevant export control classifications such as EAR99. Check for any recent package or assembly site changes documented in Product Change Notices.
Selection Notes
Select this component for designs requiring robust surface mount voltage regulation in extreme environments. The 5-watt power rating allows for significant current handling compared to standard small-signal diodes. Consider the D-5B package dimensions for PCB layout constraints. Verify thermal derating requirements if operating above 140°C case temperature.
Part Context
This part belongs to the 1N4954US through 1N4996US series of 5-watt Zener regulators. These devices are designed for military and aerospace markets, offering superior stability and durability compared to commercial equivalents. The US suffix indicates the surface mount E-package configuration.
Replacement Considerations
Axial-leaded equivalents are available by removing the 'US' suffix (e.g., 1N4966). Other parts in the series offer different voltage ratings but share similar construction.
