1N4926A/TR

Overview

The 1N4926A/TR is a temperature-compensated Zener diode manufactured by Microchip Technology. It features a nominal Zener voltage of 19.2 V with a tolerance of ±5%. The device operates in the DO-35 (DO-204AH) axial through-hole package and dissipates up to 500 mW of power. Key electrical parameters include a maximum reverse leakage current of 15 µA, a Zener impedance of 200 Ohms at test currents, and a voltage temperature coefficient of 0.002 %/°C. It supports an operating temperature range from -65 °C to +175 °C.

Feature Summary

• Temperature compensated design for stable voltage regulation across wide thermal ranges
• High-temperature operation capability up to 175 °C junction temperature
• Axial leaded construction suitable for through-hole mounting applications

Applications

• Precision voltage reference circuits requiring thermal stability
• Overvoltage protection in high-temperature industrial environments
• Voltage regulator stages in aerospace or military-grade electronics

Procurement Notes

Verify the specific suffix TR indicates reel packaging when ordering. Confirm RoHS compliance status as some variants may be non-compliant. Ensure the DO-35 package dimensions match your PCB footprint requirements. Check for obsolescence notices on the manufacturer website before finalizing procurement plans.

Selection Notes

Select this component when precise voltage regulation is required under varying thermal conditions. The low temperature coefficient makes it superior to standard Zener diodes for critical references. Verify that the 500 mW power rating meets the circuit's dissipation needs. Ensure the axial package style aligns with the assembly process.

Part Context

This part belongs to Microchip's legacy 1N49xx series of temperature-compensated Zener diodes. These components are designed to replace older industry-standard parts while offering improved thermal performance. The series is widely used in applications where voltage drift due to temperature changes must be minimized.

Replacement Considerations

Direct substitutes include other 1N4926A variants from different manufacturers if pin-compatible. Verify that replacement parts maintain the same 19.2 V nominal voltage and ±5% tolerance. Ensure the replacement also offers a similar temperature coefficient and power dissipation rating.