1N3821AUR-1/TR

Single Zener Diodes Overview

The Microchip Technology 1N3821AUR-1/TR is a hermetically sealed glass Zener diode in the DO-213AB (MELF, LL41) leadless surface-mount package. It features a nominal Zener voltage of 3.3V with a ±5% tolerance and a test current of 76mA. The device has a maximum DC power dissipation of 1W at an end-cap temperature of 125°C, derating by 20mW/°C above this threshold. Electrical characteristics include a maximum Zener impedance (Zzt) of 10 ohms and a maximum reverse leakage current of 100µA at 1V. It operates within a temperature range of -65°C to +175°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass construction for environmental protection
• Leadless MELF package designed for automated surface-mount assembly
• Double plug construction for enhanced reliability
• Extended operating temperature range suitable for harsh environments

Single Zener Diodes Applications

• Voltage regulation in aerospace systems
• Reference voltage sources in defense electronics
• Temperature compensated circuits
• Overvoltage protection in military-grade equipment

Single Zener Diodes Procurement Notes

Verify that the ordering suffix /TR indicates tape-and-reel packaging when sourcing. Confirm compliance with MIL-PRF-19500/115 specifications if radiation hardness or specific military quality levels are required. Ensure the supplier provides traceability documentation consistent with the manufacturer's standards for this component series.

Single Zener Diodes Selection Notes

Select this component for applications requiring a stable 3.3V reference in a compact surface-mount form factor. Consider the low thermal resistance and high junction temperature capability for designs with limited cooling options. Verify that the 100µA leakage current meets the circuit requirements at the maximum operating voltage.

Single Zener Diodes Part Context

This part belongs to the CDLL3821 through CDLL3828A series of Zener diodes manufactured by Microchip Technology. These devices share the same DO-213AB package and general electrical structure but vary in nominal Zener voltage from 3.3V to 6.2V. The series is commonly used in precision analog circuits where size and reliability are critical constraints.

Single Zener Diodes Replacement Considerations

Direct parameter-equivalent replacements may be found within the same CDLL3821A family or other manufacturers' DO-213AB Zener diodes with identical 3.3V voltage and 1W power ratings. Verify mechanical dimensions and polarity markings match before substitution.