1N4904A/TR

Overview

The 1N4904A/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 temperature range of -65°C to +175°C. It utilizes a DO-7 axial through-hole package and includes a test current of 2 mA.

Feature Summary

• Temperature compensated design for stable voltage regulation across wide thermal ranges
• High junction temperature capability supporting operation up to 175°C
• Through-hole axial leaded construction for standard PCB mounting

Applications

• Precision voltage reference circuits requiring thermal stability
• Overvoltage protection in industrial environments
• Voltage clamping in high-temperature electronic systems

Procurement Notes

Verify the specific suffix against official Microchip documentation to confirm tape-and-reel packaging versus bulk supply. Ensure the requested part number matches the exact electrical specifications, particularly the 12.8 V Zener voltage and 400 mW power rating, as variations exist within the family. Cross-reference the manufacturer's latest datasheet for any updates on RoHS compliance or material declarations prior to ordering.

Selection Notes

Select this component when a stable 12.8 V reference is needed in applications subject to significant thermal fluctuations. The temperature compensation feature distinguishes it from standard Zener diodes, making it suitable for precision analog circuits. Confirm that the through-hole DO-7 package aligns with the board layout requirements and that the 400 mW power rating suffices for the expected operating current.

Part Context

This part belongs to Microchip's temperature-compensated Zener diode series, designed for applications demanding high voltage stability over varying temperatures. Unlike standard Zener diodes, these devices incorporate internal compensation mechanisms to minimize voltage drift. The 1N4904A variant specifically targets the 12.8 V range, offering a balance between precision and power handling in a traditional axial package.