1N4921A/TR

Overview

The Microchip Technology 1N4921A/TR is a temperature-compensated Zener diode designed for precision voltage regulation applications. It features a nominal Zener voltage of 19.2 V with a tight tolerance of ±5%. The device is housed in a DO-35 (DO-204AH) through-hole package and supports a maximum power dissipation of 500 mW. It operates within an extended temperature range from -65°C to +175°C, ensuring stability under varying thermal conditions. The component is supplied in a reel packaging format.

Feature Summary

• Temperature compensated design for stable voltage reference performance across wide thermal ranges
• Precision voltage regulation with tight manufacturing tolerance
• Robust through-hole construction suitable for high-reliability circuit integration

Applications

• Precision voltage reference circuits requiring thermal stability
• Overvoltage protection in sensitive electronic systems
• Voltage clamping applications in industrial control equipment

Procurement Notes

Verify the specific suffix TR indicates reel packaging when sourcing. Confirm RoHS compliance status as documentation may vary by production batch. Ensure the DO-35 package dimensions match your PCB footprint requirements. Cross-reference the manufacturer part number with official Microchip databases to validate authenticity and current production status before finalizing procurement decisions.

Selection Notes

Select this component when a stable 19.2 V reference is required in environments with significant temperature fluctuations. The temperature compensation feature distinguishes it from standard Zener diodes, making it suitable for high-precision analog circuits. Consider the 500 mW power rating to ensure adequate thermal headroom in your specific application layout.

Part Context

This component belongs to Microchip's family of temperature-compensated Zener diodes, which are engineered for superior voltage stability compared to conventional devices. These diodes utilize specialized doping profiles to minimize voltage drift over temperature, providing reliable performance in critical instrumentation and measurement applications where standard regulators are insufficient.

Replacement Considerations

Direct substitutes include other temperature-compensated Zener diodes with matching 19.2 V nominal voltage and similar power ratings. Verify package compatibility and electrical tolerances when considering alternatives from different manufacturers to ensure circuit performance remains within specified limits.