1N4929A/TR

Overview

The 1N4929A/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 is rated for 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 50 Ohms, and a test current of 4 mA. The component utilizes an axial DO-7 (DO-204AA) through-hole package and is supplied in reel packaging.

Feature Summary

• Temperature compensated design utilizing a series-connected silicon junction to stabilize voltage across wide thermal ranges
• Single configuration optimized for precision reference applications requiring low temperature coefficient performance

Applications

• Precision voltage reference circuits
• Temperature compensated regulator designs
• High-stability analog signal conditioning

Procurement Notes

Verify the specific suffix designation against official Microchip documentation to confirm the exact tape-and-reel quantity and handling specifications. Ensure that the required operating temperature range aligns with the specified -65°C to +175°C limits. Confirm compliance requirements as RoHS status may vary by production batch. Cross-reference the manufacturer part number directly with authorized distributors to validate authenticity and current availability status.

Selection Notes

Select this component when stable voltage regulation is critical under varying thermal conditions. The temperature compensation feature distinguishes it from standard Zener diodes, making it suitable for environments with significant temperature fluctuations. Verify that the 400 mW power rating meets the circuit's dissipation needs and that the axial leaded package fits the board layout constraints.

Part Context

This component belongs to the 1N49xxA series of temperature-compensated Zener diodes produced by Microchip Technology. These devices are engineered to provide superior voltage stability compared to conventional Zener diodes by combining a negative temperature coefficient Zener junction with a positive coefficient forward-biased diode junction. This series is commonly used in industrial and military-grade electronics where reliability under thermal stress is essential.

Replacement Considerations

Direct replacements within the same family include 1N4908A/TR and 1N4899A/TR, which share identical 12.8 V specifications and temperature-compensated characteristics. Verify pinout compatibility and package dimensions before substitution.