1N4121UR-1/TR

Single Zener Diodes Overview

The Microchip Technology 1N4121UR-1/TR is a glass surface mount Zener voltage regulator with a nominal breakdown voltage of 33 V. It operates within the 1N4099UR through 1N4135UR series and utilizes a hermetically sealed DO-213AA (SOD80/MLL34) MELF package. The device provides a maximum steady-state power dissipation of 0.5 watts at an end cap temperature below 100°C or ambient temperature below 25°C. Electrical characteristics include a test current of 250 μA, a maximum impedance of 0.01 Ω, and a typical temperature coefficient of 0.085 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass DO-213AA MELF package
• Internal metallurgical bond construction
• Radiation hard design
• ESD insensitive per MIL-STD-750 Method 1020

Single Zener Diodes Applications

• Voltage regulation in surface mount circuits
• Reference voltage generation
• Overvoltage protection

Single Zener Diodes Procurement Notes

Verify that the ordering suffix matches the required configuration. The 'TR' suffix indicates tape and reel packaging, while the '-1' suffix denotes internal metallurgical bonding. Confirm RoHS compliance status based on the specific e3 designation if applicable. Ensure the component meets the intended thermal and electrical requirements for the target application environment.

Single Zener Diodes Selection Notes

Select this component when a 33 V Zener reference is required in a compact surface mount form factor. The DO-213AA package offers a direct footprint replacement for traditional axial leads. Consider the radiation hardness and ESD immunity for use in harsh environments. Verify the operating temperature range and power derating curves to ensure reliable performance under expected load conditions.

Single Zener Diodes Part Context

This part belongs to the Microsemi Scottsdale Division 1N4099UR through 1N4135UR series of 0.5 W glass Zener diodes. These devices serve as surface mount equivalents to JEDEC registered axial-leaded parts. The series covers a wide voltage range from 1.8 V to 100 V with standard 5% tolerances available without additional suffixes.

Single Zener Diodes Replacement Considerations

Equivalent axial-leaded parts include the 1N4121. Surface mount alternatives within the same family are 1N4121UR and MLL4121.