1N4773A/TR

Overview

The 1N4773A/TR is a temperature-compensated Zener reference diode manufactured by Microchip Technology. It features a nominal Zener voltage of 9.1 V with a tight tolerance of 5%. The device operates in the DO-204AA (DO-7) axial through-hole package and dissipates up to 500 mW. Key electrical parameters include a maximum reverse leakage current of 10 uA, a Zener impedance of 200 Ohms at a test current of 1 mA, and an exceptionally low voltage temperature coefficient of 0.001 %/°C. It supports an operating temperature range from -65°C to +175°C.

Feature Summary

• Temperature compensated design for minimal voltage drift across wide thermal ranges
• High stability with ultra-low voltage temperature coefficient
• Robust glass encapsulation suitable for harsh environments

Applications

• Precision voltage reference circuits requiring high thermal stability
• Temperature compensation networks in analog systems
• Regulated power supplies demanding accurate reference voltages

Procurement Notes

Verify the specific suffix /TR indicates reel packaging configuration against official Microchip documentation. Confirm RoHS compliance status as datasheets may vary by revision. Ensure the required temperature coefficient specifications match the standard commercial grade unless military screening prefixes are explicitly ordered. Cross-reference the DO-204AA footprint dimensions with PCB layout requirements.

Selection Notes

Select this component when a stable 9.1 V reference is needed with superior temperature performance compared to standard Zener diodes. The 500 mW power rating suits moderate current applications. Verify that the 200 Ohm impedance meets the dynamic regulation requirements of the target circuit. Consider the axial leaded package for through-hole assembly processes.

Part Context

This part belongs to the 1N4765 through 1N4774A series of Zero-TC Reference Diodes. These devices are engineered to provide near-zero voltage temperature coefficients around the 9.1 V nominal point. The series utilizes silicon planar technology within hermetically sealed glass packages to ensure long-term reliability and consistent electrical characteristics over time.

Replacement Considerations

Direct substitutes within the same family include 1N4773 or 1N4773A without the trailing /TR if bulk packaging is acceptable. Other manufacturers producing equivalent 9.1 V temperature-compensated Zeners in DO-204AA packages may serve as alternatives, provided their temperature coefficients and impedance values meet the original design constraints.