1N4778/TR

Overview

The Microchip Technology 1N4778/TR is a single Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 8.5 V with a tolerance of ±5%. The device operates in the DO-35 (DO-204AH) axial through-hole package and dissipates up to 500 mW of power. Key electrical parameters include a maximum reverse leakage current of 10 µA, a Zener impedance of 200 Ohms, and a test current of 1 mA. It supports an operating temperature range from -65 °C to +175 °C.

Feature Summary

• Temperature compensated design for stable voltage reference performance across wide thermal ranges
• High reliability construction suitable for demanding industrial environments
• Precision voltage regulation capability within specified tolerance limits

Applications

• Voltage reference circuits requiring high stability
• Overvoltage protection systems
• Precision power supply regulation

Procurement Notes

Verify the specific suffix and packaging configuration against official Microchip documentation before ordering. Confirm that the DO-35 package dimensions align with your PCB layout requirements. Ensure the 500 mW power dissipation rating meets your thermal management constraints. Cross-reference the manufacturer part number to avoid confusion with similar variants in the 1N47xx series.

Selection Notes

Select this component when a stable 8.5 V reference is required in a through-hole assembly. The wide operating temperature range makes it suitable for harsh environments. Consider the 200 Ohm impedance for dynamic load applications. Verify compatibility with existing circuit designs regarding leakage current and power dissipation limits.

Part Context

This component belongs to the standard Zener diode family manufactured by Microchip Technology. It utilizes the legacy 1N47xx numbering system adapted for modern production. The device is classified under discrete semiconductors and diodes. It serves as a fundamental passive component for voltage clamping and regulation in electronic assemblies.

Replacement Considerations

Consult official Microchip substitution guides for verified equivalents. Generic replacements may not match the specific temperature compensation characteristics or impedance values.