JANS1N4955CUS

Single Zener Diodes Overview

The JANS1N4955CUS is a hermetically sealed, single Zener diode manufactured by Microchip Technology. It features a nominal Zener voltage of 7.5 V with a tolerance of ±2%. The device is rated for a maximum power dissipation of 5 W and operates within an extended temperature range from -65°C to +175°C. Key electrical characteristics include a maximum reverse leakage current of 100 µA at 5.7 V, a Zener impedance of 1.5 Ohms, and a forward voltage of 1.5 V at 1 A. It utilizes a surface-mount SQ-MELF package.

Single Zener Diodes Feature Summary

• Hermetically sealed construction using voidless-glass technology with internal metallurgical bonding for enhanced reliability in harsh environments.
• Radiation-hardened design specifically qualified for space-grade applications requiring high resilience against ionizing radiation.
• Extended thermal performance capability allowing stable operation across a wide temperature range from -65°C to +175°C.

Single Zener Diodes Applications

• Spacecraft power regulation systems
• Avionics voltage reference circuits
• Military electronic equipment protection

Single Zener Diodes Procurement Notes

Verify the specific suffix CUS indicates the surface-mount SQ-MELF configuration and radiation-hardened status. Confirm compliance with MIL-PRF-19500 specifications if required for your program. Check for RoHS exemption documentation as this component typically falls under military/space exemptions. Ensure the supplier provides traceability certificates consistent with aerospace procurement standards.

Single Zener Diodes Selection Notes

Select this component when radiation hardness and hermetic sealing are mandatory requirements. Compare against standard commercial variants if environmental conditions do not necessitate space-grade qualification. Consider the surface-mount form factor for PCB layout constraints versus axial leaded alternatives like the JAN1N4955. Verify that the 7.5 V regulation point aligns with system voltage requirements.

Single Zener Diodes Part Context

This part belongs to the 1N4955 series of 5 Watt Zener Voltage Regulators produced by Microchip Technology (formerly Microsemi). The series includes various packaging options such as axial through-hole and surface-mount configurations. The JANS prefix denotes a specific subset of devices engineered for nuclear and space environments, distinguishing them from standard industrial or commercial grade parts in the same family.

Single Zener Diodes Replacement Considerations

Direct substitutes include other radiation-hardened Zener diodes from qualified manufacturers meeting MIL-PRF-19500 standards. Cross-reference with JAN1N4955CUS for pin-compatible alternatives if package dimensions must remain identical. Verify that any replacement maintains the same 5 W power rating and 7.5 V nominal voltage with comparable impedance characteristics.