1N4118-1

Single Zener Diodes Overview

The Microchip Technology 1N4118-1 is a 500 mW metallurgically bonded glass Zener diode in an axial-lead DO-35 package. It provides a nominal Zener voltage of 27 V with a standard tolerance of ±5%. The device operates within a junction and storage temperature range of -65°C to +175°C. Electrical characteristics include a maximum dynamic impedance of 150 Ohms at a test current of 250 µA, a maximum reverse leakage current of 1 µA at 20.5 V, and a maximum noise density of 20.5 µV/√Hz.

Single Zener Diodes Feature Summary

• Features internal metallurgical bonding for enhanced structural integrity and reliability.
• Qualified per MIL-PRF-19500/435 standards for high-reliability applications.
• Provides stable voltage regulation across broad ranges of current and temperature.
• Constructed with hermetically sealed glass packaging.

Single Zener Diodes Applications

• Voltage reference circuits requiring radiation hardness
• High-reliability power supply regulation
• Temperature-compensated Zener references

Single Zener Diodes Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for the application, as the base part number covers multiple qualification grades. Confirm RoHS compliance status if environmental regulations apply, noting that commercial versions may differ from military qualifications. Ensure the ordering suffix matches the desired tolerance and packaging configuration.

Single Zener Diodes Selection Notes

Select this component when a robust, low-noise Zener regulator is needed for harsh environments. The 27 V output suits mid-range reference applications. Consider the 500 mW power dissipation limit and derating requirements above 50°C. Verify that the axial-lead DO-35 package fits the mechanical constraints of the design.

Single Zener Diodes Part Context

This device belongs to the 1N4099-1 through 1N4135-1 series of 500 mW Zener diodes manufactured by Microchip Technology. These components are designed for demanding electronic systems where long-term stability and resistance to environmental stressors are critical. The series offers a wide selection of voltages from 1.8 V to 100 V.

Single Zener Diodes Replacement Considerations

Public confirmed substitute part numbers: JANS1N4118-1, JANS1N4118C-1, JANS1N4118D-1.

Single Zener Diodes FAQ

What is the maximum noise density specified for the 1N4118-1?

The maximum noise density is 20.5 µV/√Hz at the test current of 250 µA.

How does the power dissipation change with temperature?

The rated 0.5 W power dissipation must be linearly derated starting at a lead temperature of 50°C, reaching zero at 175°C.