1N6333

Overview

The Microchip Technology 1N6333 is a military-qualified, voidless hermetically sealed glass Zener diode with a nominal voltage of 24.0 V and a maximum power dissipation of 500 mW. It operates within a junction temperature range of -65°C to +175°C. The device features a standard 5% voltage tolerance, a dynamic impedance of 24 ohms at the test current of 5.2 mA, and a maximum reverse leakage current of 10 µA at 25°C. It utilizes axial leads in a DO-35 package.

Feature Summary

• Hermetically sealed voidless-glass construction with internal metallurgical bonds for high-reliability applications.
• Qualified per MIL-PRF-19500/533 standards across JAN, JANTX, JANTXV, and JANS reliability levels.
• Inherently radiation hard and non-sensitive to electrostatic discharge (ESD) per MIL-STD-750 method 1020.

Applications

• High-reliability aerospace systems where component failure cannot be tolerated.
• Military-grade voltage regulation circuits requiring broad operating current stability.
• Harsh environment electronics utilizing robust axial-lead mounting terminals.

Procurement Notes

Verify that the specific ordering suffix matches the required reliability level (JAN, JANTX, JANTXV, or JANS), as these designations dictate qualification standards rather than altering electrical function. Confirm RoHS compliance status if applicable, noting that commercial versions may differ from military specifications. Ensure lead finish requirements align with assembly processes, as tin/lead options are standard while matte/tin is available for commercial grades only.

Selection Notes

Select this component when a 24 V reference is needed in a ruggedized, through-hole form factor. The 500 mW rating supports moderate current loads, while the wide temperature range (-65°C to +175°C) suits extreme environments. Consider tighter tolerances (1% or 2%) via part nomenclature if standard 5% accuracy is insufficient for the circuit design.

Part Context

This device belongs to the 1N6309 through 1N6355 series of industry-recognized Zener voltage regulators. The series spans voltages from 2.4 V to 200 V, offering extensive selection for various regulation needs. All variants share the same voidless hermetic glass package and military qualification framework, ensuring consistent mechanical and environmental performance across the product line.

Replacement Considerations

Direct substitutes include other parts within the 1N6309–1N6355 series that match the 24 V specification. Equivalent alternatives must maintain the 500 mW power rating and DO-35 axial package. Verify that any replacement meets the same MIL-PRF-19500/533 qualification level required by the original design.

FAQ

What is the thermal resistance of the 1N6333?

The thermal resistance from junction to lead is 150 °C/W for devices in the 1N6309–1N6320 range, while the 1N6321–1N6355 range (including the 1N6333) has a junction-to-lead thermal resistance of 95.5 °C/W.

How is polarity indicated on the device?

Polarity is identified by a band painted on the body of the glass package, which marks the cathode end of the diode.