1N2998RB

Overview

The Microchip Technology 1N2998RB is a 52V Zener diode with a 10W power rating, housed in a DO-213AA (DO-4) stud-mount package. It features reverse polarity configuration with the anode connected to the stud. The device operates within a junction temperature range of -65°C to +175°C and offers standard voltage tolerances of ±5%. Qualified under MIL-PRF-19500/124 for JAN, JANTX, and JANTXV reliability levels, it provides hermetically sealed construction suitable for demanding environments.

Feature Summary

• Hermetically sealed welded metal and glass construction with internal solder bond design.
• Reverse polarity configuration where the anode is connected to the mounting stud.
• Inherently radiation hard and non-sensitive to electrostatic discharge per MIL-STD-750 method 1020.
• Available in JAN, JANTX, and JANTXV military qualification grades.

Applications

• Voltage regulation over broad current and temperature ranges.
• High-reliability aerospace and defense electronic systems.
• Radiation-hardened circuit protection applications.

Procurement Notes

Verify the specific reliability grade required, as JAN, JANTX, and JANTXV qualifications are available. Confirm that the reverse polarity orientation matches the system design requirements. Ensure thermal management accounts for the 12°C/W junction-to-case resistance and derating curves above 55°C. Check for RoHS compliance needs, noting that e3 suffixes apply only to commercial grades.

Selection Notes

Select this component when a 52V regulation point is needed with high power dissipation capabilities. The reverse polarity variant is essential if the circuit design requires the anode to be electrically common with the chassis or heat sink. Consider the operating temperature range and verify that the maximum DC Zener current ratings align with the expected load conditions at elevated temperatures.

Part Context

This part belongs to the JEDEC registered 1N2970B through 1N3015B series of 10W Zener diodes. These devices provide voltage regulation values between 3.9V and 200V. The 1N2998RB specifically utilizes the DO-213AA package and is designed for robust performance in industrial and military-grade applications requiring stable voltage reference points.

Replacement Considerations

Direct replacements must match the 52V nominal Zener voltage, 10W power rating, and reverse polarity configuration. Verify compatibility with MIL-PRF-19500/124 qualification levels if military standards are mandated. Ensure the replacement maintains the same DO-213AA mechanical footprint and terminal specifications.