1N4773

Overview

The Microchip Technology 1N4773/TR is a temperature-compensated Zener reference diode housed in the DO-204AA (DO-7) axial glass package. It provides a nominal Zener voltage of 9.1 V with a tight tolerance of 5% and a low voltage temperature coefficient of 0.001%/°C. The device dissipates up to 500 mW, operates within a junction temperature range of -65°C to +175°C, and maintains a maximum reverse leakage current of 10 µA at a test current of 1 mA.

Feature Summary

• Temperature compensated design for minimal voltage drift across wide thermal ranges
• Hermetically sealed glass construction ensuring environmental stability
• Low voltage temperature coefficient for high precision reference applications

Applications

• Precision voltage reference circuits requiring thermal stability
• Temperature compensation networks in analog systems
• High-reliability industrial instrumentation power supplies

Procurement Notes

Verify the specific suffix against official documentation, as prefixes like MQ or MX indicate distinct military-grade screening levels rather than standard commercial variants. Confirm RoHS compliance status directly with the manufacturer, as historical data indicates non-compliance for certain versions. Ensure the ordering quantity aligns with reel packaging requirements specified in the datasheet.

Selection Notes

Select this component when stable voltage regulation is critical under varying thermal conditions. The 9.1 V nominal output and low temperature coefficient make it suitable for precision references. Verify that the required operating temperature range fits within the -65°C to +175°C specification and that the 500 mW power dissipation meets circuit demands.

Part Context

This part belongs to the 1N4765 through 1N4774A series of Zero-TC Reference Diodes manufactured by Microsemi/Microchip Technology. These devices are designed to provide stable voltage references with minimal change over temperature. The series covers various nominal voltages centered around 9.1 V, utilizing silicon technology in hermetically sealed glass packages for durability.

Replacement Considerations

Substitutes include other parts from the 1N4765–1N4774A series with matching voltage and TC specifications. Military equivalents may require prefixes such as MQ, MX, MV, or MSP depending on the required screening level. Verify pinout compatibility and package dimensions before integration.