1N4779/TR

Overview

The 1N4779/TR is a single silicon Zener diode manufactured by Microchip Technology, designed for voltage regulation applications. It features a nominal Zener voltage of 8.5V with a tolerance of ±5%. The device has a power dissipation rating of 0.5W (500mW) and operates within a temperature range of -65°C to +175°C. It is housed in a DO-204AH (DO-35) glass axial leaded package, suitable for through-hole mounting. The component is specified as temperature compensated.

Feature Summary

• Temperature compensated design for stable voltage regulation across wide operating ranges
• Hermetically sealed glass axial package ensuring environmental durability
• Single diode configuration optimized for discrete voltage reference circuits

Applications

• Voltage regulation in precision analog circuits
• Overvoltage protection in sensitive electronic systems
• Reference voltage generation in measurement instrumentation

Procurement Notes

Verify the specific suffix /TR indicates tape and reel packaging if required for automated assembly. Confirm RoHS compliance status as sources indicate non-compliance or restricted availability. Check current stock levels as some distributors report limited supply. Ensure the DO-35 package matches the target PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component when an 8.5V regulated reference is needed with high-temperature stability up to 175°C. The 0.5W power rating suits low-current regulation tasks. Compare against standard Zener diodes if temperature compensation is critical for the application's accuracy requirements over varying thermal conditions.

Part Context

This part belongs to the Microchip Technology 1N47xx series of Zener diodes. These components are widely used in industrial and military-grade electronics due to their reliability and hermetic sealing options. The 1N4779 variant specifically targets applications requiring precise voltage clamping at 8.5V with enhanced thermal performance characteristics compared to standard commercial grade equivalents.

Replacement Considerations

Equivalent parts include the 1N4779 without the /TR suffix for loose tube packaging. Verify pinout compatibility with DO-35 packages when substituting. Cross-reference with other manufacturers' 8.5V 500mZener diodes only if electrical parameters match exactly.