1N4784A/TR

Overview

The Microchip Technology 1N4784A/TR is a temperature-compensated Zener diode designed for precision voltage regulation. It features an 8.5 V nominal Zener voltage with a tight 5% tolerance and operates within a wide thermal range from -65°C to +175°C junction temperature. The device dissipates up to 500 mW in a DO-204AA-2 axial package, suitable for through-hole mounting. Key electrical characteristics include a maximum reverse leakage current of 10 µA, a Zener impedance of 100 Ohms at a test current of 1 mA, and a low voltage temperature coefficient of 0.0005 %/°C.

Feature Summary

• Temperature compensated design ensures stable voltage output across extreme thermal variations
• High reliability construction supports operation in demanding industrial environments
• Precision voltage regulation capability with tight manufacturing tolerances

Applications

• Precision reference voltage sources in measurement instrumentation
• Voltage regulation circuits requiring stability over wide temperature ranges
• Protection circuits in aerospace and military electronic systems

Procurement Notes

Verify the specific suffix /TR indicates reel packaging when confirming orders. Confirm RoHS compliance status as documentation may indicate non-compliance for certain variants. Validate that the DO-204AA-2 package dimensions match your PCB footprint requirements. Ensure the 500 mW power dissipation rating aligns with your thermal management design constraints before finalizing procurement.

Selection Notes

Select this component when precise voltage referencing is required under significant thermal stress. The low temperature coefficient makes it superior to standard Zener diodes for critical applications. Consider the 100 Ohm impedance value for high-frequency noise sensitivity in your circuit design. Verify that the 1 mA test current condition matches your operating bias point for accurate performance prediction.

Part Context

This part belongs to Microchip's legacy 1N47xx series of Zener diodes, adapted for modern manufacturing processes. The 1N4784A variant specifically targets applications needing stable 8.5 V references. The /TR suffix denotes tape and reel packaging for automated assembly. This series maintains compatibility with traditional through-hole mounting techniques while offering enhanced thermal performance.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify pinout compatibility and thermal resistance characteristics if considering alternative manufacturers. Ensure any replacement meets the same 175°C maximum junction temperature rating.