1N4897A/TR

Overview

The 1N4897A/TR is a temperature-compensated Zener diode manufactured by Microchip Technology. It features a nominal Zener voltage of 12.8 V with a tolerance of ±5%. The device has a maximum power dissipation of 400 mW and operates within a junction temperature range of -65°C to +175°C. Key electrical parameters include a maximum reverse leakage current of 15 µA, a Zener impedance of 400 Ohms, and a voltage temperature coefficient of 0.001 %/°C. It is housed in an axial DO-7 (DO-204AA) package and supplied in a reel.

Feature Summary

• Temperature compensated design for stable voltage regulation across wide thermal ranges
• High operating junction temperature capability up to 175°C
• Low voltage temperature coefficient ensuring precision performance

Applications

• Precision voltage reference circuits requiring thermal stability
• Overvoltage protection in sensitive electronic systems
• Test and measurement equipment calibration references

Procurement Notes

Verify the specific suffix TR indicates tape-and-reel packaging configuration. Confirm RoHS compliance status as documentation may vary by production batch. Ensure the DO-7 axial leaded package matches your PCB footprint requirements. Cross-reference the 12.8V Zener voltage specification against circuit design limits to prevent overvoltage conditions during operation.

Selection Notes

Select this component when high thermal stability is critical for voltage regulation accuracy. The low temperature coefficient makes it suitable for environments with significant temperature fluctuations. Consider the 400 mW power rating for appropriate heat dissipation planning. Verify that the axial DO-7 package fits the available board space and mounting constraints.

Part Context

This part belongs to the 1N48xx series of temperature-compensated Zener diodes from Microchip Technology. These devices are engineered to provide superior voltage stability compared to standard Zener diodes by utilizing a combination of Zener and avalanche breakdown mechanisms. The series is widely used in applications demanding precise reference voltages under varying thermal conditions.

Replacement Considerations

Check datasheets for equivalent temperature-compensated Zener diodes with matching 12.8V nominal voltage and ±5% tolerance. Verify compatibility of the DO-7 package and 400 mW power rating. Ensure similar temperature coefficient specifications are met for direct substitution in precision reference applications.