1N4900A/TR

Overview

The Microchip Technology 1N4900A/TR is a temperature-compensated Zener diode designed for precision voltage regulation. It features a nominal Zener voltage of 12.8 V with a tight tolerance of ±5%. The device operates in the DO-7 axial through-hole package and dissipates up to 400 mW. Key electrical parameters include a maximum reverse leakage current of 15 µA, a Zener impedance of 200 Ohms at a test current of 1 mA, and a voltage temperature coefficient of 0.01 %/°C. It supports an extended operating temperature range from -65°C to +175°C.

Feature Summary

• Temperature compensated design ensures stable voltage regulation across wide thermal variations
• High reliability construction suitable for demanding industrial and aerospace environments
• Precision voltage tolerance maintains accuracy within specified limits under varying conditions

Applications

• Precision voltage reference circuits requiring low temperature drift
• Industrial control systems operating in extreme temperature ranges
• Aerospace and defense electronics with strict reliability standards

Procurement Notes

Verify the specific suffix TR indicates tape and reel packaging configuration against official datasheets. Confirm RoHS compliance status as documentation may vary by production batch. Ensure the DO-7 package dimensions match PCB layout requirements before finalizing procurement decisions.

Selection Notes

Select this component when precise voltage stability over temperature is critical. The 12.8 V rating suits applications needing specific reference levels without additional scaling. Consider the 400 mW power dissipation limit for thermal management planning in enclosed designs.

Part Context

This part belongs to Microchip's legacy 1N49xx series of Zener diodes, adapted for surface or through-hole mounting via specific suffixes. The 1N4900A variant specifically targets the 12.8 V segment, offering improved temperature characteristics compared to standard Zener diodes in the same voltage class.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.