1N4922/TR

Overview

The Microchip Technology 1N4922/TR is a temperature compensated Zener diode designed for precision voltage reference applications. It features a nominal Zener voltage of 19.2 V with a tight tolerance of ±5%. The device operates in the DO-35 (DO-204AH) through-hole package and dissipates up to 500 mW. Key electrical parameters include a maximum reverse leakage current of 15 µA, a Zener impedance of 25 Ohms at a test current of 7.5 mA, and a low voltage temperature coefficient of 0.01 %/°C. It supports an operating temperature range from -65°C to +175°C.

Feature Summary

• Temperature compensated design ensures stable voltage reference across wide thermal ranges
• Low noise characteristics suitable for sensitive analog circuitry
• High reliability construction with extended high-temperature operation capability

Applications

• Precision voltage reference circuits
• Temperature compensated oscillator references
• Analog signal conditioning stages requiring stable bias voltages

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm RoHS status as non-compliant per available documentation. Ensure ordering quantities align with reel packaging requirements specified by the distributor. Validate that the DO-35 package dimensions match your PCB footprint constraints before finalizing procurement.

Selection Notes

Select this component when a stable 19.2 V reference is required with minimal drift over temperature variations. The ±5% tolerance offers standard precision without the cost of tighter grades. Consider the 500 mW power rating for thermal management in enclosed environments. The through-hole DO-35 package facilitates easy prototyping and manual assembly compared to surface-mount alternatives.

Part Context

This part belongs to Microchip's legacy 1N49xx series of temperature-compensated Zener diodes. These components are engineered to provide superior stability compared to standard Zener diodes, particularly in the 5V to 20V range where temperature coefficients can be minimized. The 'TR' suffix indicates tape and reel packaging for automated handling.

Replacement Considerations

Direct substitutes include other 19.2 V temperature-compensated Zener diodes from manufacturers like ON Semiconductor or Vishay, provided they meet the same DO-35 package and 500 mW power dissipation requirements. Verify pinout compatibility and ensure equivalent temperature coefficient specifications.