JAN1N6344US

Single Zener Diodes Overview

The JAN1N6344US is a military-qualified Zener voltage regulator diode from the 1N6309 through 1N6355 series, manufactured by Microchip Technology. It operates in a B-SQ MELF surface-mount package with a nominal Zener voltage of 68 V and a test current of 1.8 mA. The device features a maximum dynamic impedance of 155 ohms and a steady-state power dissipation of 0.5 W at an end cap temperature of 150 °C. It supports a junction temperature range from -65 °C to +175 °C and includes internal Category III metallurgical bonds.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless glass construction with tungsten slugs for robust physical integrity.
• Internal Category III metallurgical bonding ensures high reliability under demanding conditions.
• Surface mount equivalent of the JEDEC registered 1N6309 through 1N6355 axial-leaded series.
• Inherently radiation hard and non-sensitive to electrostatic discharge per MIL-STD-750 method 1020.

Single Zener Diodes Applications

• High-reliability aerospace systems where component failure cannot be tolerated.
• Military electronic circuits requiring strict adherence to MIL-PRF-19500/533 standards.
• Voltage regulation across broad operating current and temperature ranges.
• Radiation-hardened environments utilizing inherent device hardness properties.

Single Zener Diodes Procurement Notes

Verify that the specific ordering suffix matches the required reliability level (JAN, JANTX, JANTXV, or JANS) and voltage tolerance. Confirm RoHS compliance status if applicable, as compliant versions are available only on commercial grades. Ensure the procurement documentation explicitly references MIL-PRF-19500/533 qualification. Validate that the package type corresponds to the B-SQ MELF form factor before finalizing orders.

Single Zener Diodes Selection Notes

Select this component when a surface-mount solution is required for the 1N6309–1N6355 series functionality. Choose based on the specific Zener voltage tolerance requirements, noting that tighter tolerances utilize different nomenclature suffixes. Consider the thermal resistance characteristics relative to the intended heat sinking strategy. Verify compatibility with existing PCB footprints designed for the B-SQ MELF package dimensions.

Single Zener Diodes Part Context

This part belongs to the industry-recognized 0.5 watt Zener voltage regulator family produced by Microchip Technology. It serves as the surface-mount counterpart to traditional axial-leaded packages like DO-35. The series provides extensive selections ranging from 2.4 to 200 volts, catering to diverse voltage regulation needs in critical applications.

Single Zener Diodes Replacement Considerations

Direct replacements include other variants within the 1N6309 through 1N6355 series that share the same B-SQ MELF package and MIL-PRF-19500/533 qualification. Substitutes must match the 68 V nominal voltage and 0.5 W power rating. Axial-leaded equivalents like the 1N6344 require mechanical adaptation.