1N3998RA

Single Zener Diodes Overview

The Microchip Technology 1N3998RA is a 10W Zener diode with a nominal voltage of 6.2V and a standard tolerance of ±5%. It operates within a junction temperature range of -65°C to +175°C and features a DO-213AA (DO-4) stud-mount package. The device offers a maximum dynamic impedance of 1.1 Ohms at the test current of 405mA, with a reverse leakage current of 10µA at 2.0V. Qualified under MIL-PRF-19500/124 for JAN, JANTX, and JANTXV levels, it utilizes internal solder bond construction.

Single Zener Diodes Feature Summary

• Hermetically sealed welded metal and glass construction with internal solder bond.
• Inherently radiation hard design suitable for harsh environments.
• Non-sensitive to electrostatic discharge per MIL-STD-750 method 1020.
• Standard polarity configuration with cathode connected to the mounting stud.

Single Zener Diodes Applications

• Voltage regulation over broad current and temperature ranges.
• Military and aerospace electronic systems requiring high reliability.
• Harsh environment applications benefiting from radiation hardness.

Single Zener Diodes Procurement Notes

Verify the specific qualification level required, as JAN, JANTX, and JANTXV grades are available. Confirm that the standard polarity matches the circuit design, as this suffix indicates cathode-to-stud orientation. Ensure thermal management accounts for the 10W dissipation rating and derating requirements above 55°C case temperature. Check for RoHS compliance needs, noting that commercial versions may differ in plating options.

Single Zener Diodes Selection Notes

Select this component when a 6.2V reference or regulator is needed in a stud-mount form factor. The DO-4 package facilitates direct chassis mounting for efficient heat dissipation. Consider the ±5% tolerance and temperature coefficient of +0.045%/°C for precision requirements. Verify that the maximum DC Zener current of 1520mA aligns with the system's power budget and thermal constraints.

Single Zener Diodes Part Context

This part belongs to the 1N3993A through 1N3998A series of 10W Zener diodes. These devices share the same DO-213AA package and general electrical characteristics but vary by nominal voltage. The RA suffix specifically denotes the reverse polarity configuration relative to the standard 1N2970B series, where the cathode is attached to the stud rather than the anode.

Single Zener Diodes Replacement Considerations

Direct substitutes include other manufacturers' 1N3998 equivalents meeting MIL-PRF-19500/124 specifications. Commercial grade 1N3998 parts without military qualification may be used if environmental ratings allow. Verify mechanical dimensions and thread compatibility (10-32 UNF-2A) before substitution.

Single Zener Diodes FAQ

What does the 'RA' suffix indicate on the 1N3998RA?

The 'RA' suffix indicates that the device has standard polarity for the 1N3993A–1N3998A series, meaning the cathode is connected to the mounting stud.

Is the 1N3998RA radiation hard?

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

What is the maximum operating junction temperature?

The maximum junction temperature (TJ) is +175°C.