1N4679

Overview

The Microchip Technology 1N4679 is a silicon Zener diode designed for voltage regulation applications. It operates within the DO-35 glass axial leaded package, providing a nominal Zener voltage of 2.0 V with a standard tolerance of ±5%. The device supports a maximum steady-state power dissipation of 500 mW at ambient temperatures below 75°C. It features a junction temperature rating up to 200°C and an isolated case connection. The component is suitable for through-hole mounting and functions reliably across a wide operating temperature range from -65°C to +175°C.

Feature Summary

• Hermetically sealed double slug type glass construction for high reliability
• Metallurgically bonded internal structure ensuring stable performance
• Standard 5% voltage tolerance for precise regulation requirements

Applications

• Voltage reference circuits requiring low voltage stability
• Overvoltage protection in sensitive electronic systems
• Clamping applications in signal processing paths

Procurement Notes

Verify the specific manufacturer source, as the 1N4679 designation is historically associated with multiple producers including Motorola and Microsemi. Confirm that the supplied unit matches the required JEDEC DO-35 package dimensions and electrical characteristics. Ensure compliance with RoHS directives if applicable to your assembly process. Request detailed datasheets to validate the exact test current and impedance values for your design simulation.

Selection Notes

Select this component when a low-voltage reference near 2V is required in a standard axial package. Consider the 500mW power rating against expected thermal conditions. Evaluate the ±5% tolerance against circuit sensitivity. Compare leakage current specifications if operating in high-impedance environments. Verify availability from authorized distributors to ensure authenticity and traceability.

Part Context

This part belongs to the widely recognized 1N4678 series of 500mW glass Zener diodes. The series covers a broad voltage range from 1.8V to 200V, offering standardized options for various regulation needs. The 1N4679 specifically addresses the lower end of this spectrum. Its DO-35 package remains a common choice for through-hole PCB designs requiring robust, hermetically sealed components.

Replacement Considerations

Equivalent parts include the 1N4679D-BP from Micro Commercial Components and the 1N4679CTA2 from Tak Cheong. These alternatives share similar 2V Zener voltage and 500mW power ratings in comparable packages. Verify pinout compatibility and tolerance levels before substitution.