1N4774A/TR

Overview

The Microchip Technology 1N4774A/TR is a temperature-compensated Zener diode designed for precision voltage reference applications. It features a nominal Zener voltage of 9.1 V with a tolerance of ±5%. The device operates in the DO-7 (DO-204AA) through-hole package and dissipates up to 250 mW. Key electrical characteristics include a maximum reverse leakage current of 10 µA, a Zener impedance of 200 Ohms, and a low voltage temperature coefficient of 0.0005 %/°C. It functions within a junction temperature range of -55°C to +100°C.

Feature Summary

• Temperature compensated design for stable voltage reference performance across varying thermal conditions
• Hermetically sealed glass case construction ensuring long-term reliability
• Low voltage temperature coefficient minimizes drift in precision circuits

Applications

• Precision voltage reference sources
• Temperature compensated regulator circuits
• Low-level signal processing references

Procurement Notes

Verify the specific suffix '/TR' indicates tape and reel packaging configuration when ordering. Confirm the manufacturer is Microchip Technology, as this part number family has historical origins from other semiconductor vendors. Ensure the required power rating of 250 mW aligns with your thermal management design. Cross-reference datasheets to confirm the exact Zener impedance and leakage specifications match your circuit requirements before finalizing procurement.

Selection Notes

Select this component when a stable voltage reference near 9.1 V is required with minimal temperature drift. The DO-7 through-hole package suits prototyping or legacy board designs. Consider the 250 mW power dissipation limit against expected operating currents. The low temperature coefficient makes it suitable for environments where thermal stability is critical compared to standard Zener diodes.

Part Context

This component belongs to the 1N47xxA series of temperature-compensated Zener diodes manufactured by Microchip Technology. These devices are engineered to provide superior voltage stability over temperature ranges compared to conventional Zener diodes. The 'A' suffix typically denotes tighter tolerance specifications, while the '/TR' suffix specifies the reel packaging format for automated assembly processes.

Replacement Considerations

Public confirmed substitute part numbers: 1N4774A.