1N4774/TR

Overview

The Microchip Technology 1N4774/TR is a single temperature-compensated Zener diode designed for precision voltage reference applications. It features a nominal Zener voltage of 9.1 V with a tight tolerance of 5%. The device operates in the DO-204AA (DO-35) axial package and dissipates up to 500 mW. Key electrical parameters include a maximum reverse leakage current of 10 µA, a Zener impedance of 200 Ohms at a test current of 1 mA, and a 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 ensures stable voltage regulation across wide thermal variations
• High precision voltage reference capability with tight tolerance specifications
• Robust construction suitable for high-temperature industrial environments

Applications

• Precision voltage reference circuits requiring thermal stability
• Temperature compensated regulator designs
• High-reliability electronic instrumentation

Procurement Notes

Verify the specific suffix /TR indicates reel packaging when ordering. Confirm RoHS compliance status through official Microchip documentation prior to integration. Ensure the DO-204AA footprint matches the target PCB layout. Validate that the 500 mW power dissipation rating aligns with the thermal management strategy of the final assembly.

Selection Notes

Select this component when a stable 9.1 V reference is required under varying thermal conditions. The low temperature coefficient makes it superior to standard Zener diodes for precision applications. Consider the axial leaded package constraints during mechanical design. Verify that the 200 Ohm impedance meets the noise and regulation requirements of the circuit.

Part Context

This part belongs to the Microchip 1N477x series of temperature-compensated Zener diodes. These devices are engineered to provide highly stable reference voltages by utilizing complementary voltage coefficients. The series is commonly used in applications where standard Zener drift would compromise system accuracy.

Replacement Considerations

Public confirmed substitutes include the generic 1N4774. Verify pinout compatibility and exact voltage tolerance matches before substitution.