1N4124UR/TR

Single Zener Diodes Overview

The Microchip Technology 1N4124UR/TR is a glass surface mount Zener voltage regulator with a nominal breakdown voltage of 43 V. It operates within the 1N4099UR through 1N4135UR series and utilizes a hermetically sealed DO-213AA (SOD80/MLL34) MELF package. The device provides a steady-state power dissipation of 0.5 W at an end cap temperature below 100°C or ambient temperature below 25°C. Electrical characteristics include a maximum Zener impedance of 250 Ohms, a test current of 250 µA, and a maximum reverse leakage current of 40 µA. The component supports tape and reel packaging for automated assembly.

Single Zener Diodes Feature Summary

• Hermetically sealed glass MELF package suitable for surface mount applications
• Inherently radiation hard construction
• ESD insensitive per MIL-STD-750 Method 1020
• Regulates voltage across a broad operating current and temperature range

Single Zener Diodes Applications

• Voltage regulation in surface mount circuits
• Radiation-hardened electronic systems
• Temperature compensated reference designs

Single Zener Diodes Procurement Notes

Verify that the ordering suffix matches the required tolerance and termination finish. Confirm the presence of the TR suffix indicates tape and reel packaging rather than bulk units. Ensure the specific part number aligns with the intended JEDEC equivalent requirements and check for any additional military qualification suffixes if applicable to the design specifications.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed surface mount Zener diode is required for space-constrained PCB layouts. Consider the 0.5 W power rating and thermal resistance values when designing heat dissipation paths on FR4 substrates. Verify that the 43 V nominal voltage and 250 Ohm impedance meet the circuit's regulation and noise density requirements.

Single Zener Diodes Part Context

This part belongs to the Microsemi Scottsdale Division 1N4099UR through 1N4135UR series of 0.5 Watt glass surface mount Zeners. These devices serve as surface mount equivalents to JEDEC registered axial-leaded parts like the 1N4124. The series offers voltages from 1.8 to 100 V with standard 5% tolerances and optional tighter tolerances via specific suffixes.

Single Zener Diodes Replacement Considerations

JEDEC registered equivalents include the 1N4124. Surface mount alternatives within the same family are MLL4124 or MLL4124e3. Devices with internal metallurgical bonds require the -1 suffix (e.g., 1N4124UR-1).

Single Zener Diodes FAQ

What is the maximum Zener impedance for the 1N4124UR?

The maximum Zener impedance (ZZT) is 250 Ohms.

Is the 1N4124UR radiation hard?

Yes, the device is inherently radiation hard as described in Microsemi MicroNote 050.