1N4921A

Overview

The Microchip Technology 1N4921A is a temperature-compensated Zener diode designed for precision voltage regulation. It features a nominal Zener voltage of 19.2 V with a tight tolerance of ±5%. The device operates in the DO-35 axial through-hole package and dissipates up to 500 mW at +50°C, with power derating applied above this threshold. It maintains functionality across an extended operating temperature range from -65°C to +175°C. Key electrical characteristics include a maximum reverse leakage current of 15 µA and a low noise profile suitable for sensitive reference applications.

Feature Summary

• Temperature compensated design ensures stable voltage reference performance across wide thermal variations
• Low noise operation minimizes signal interference in precision analog circuits
• Metallurgically bonded construction provides robust mechanical integrity and reliability

Applications

• Precision voltage reference sources in measurement instrumentation
• Temperature-stable regulator circuits requiring low drift
• Sensitive analog signal conditioning stages

Procurement Notes

Verify the specific suffix designation against the manufacturer datasheet to confirm exact tolerance and temperature coefficient specifications. Ensure the procurement channel provides original manufacturer documentation to validate authenticity. Confirm RoHS compliance status as indicated in official product declarations before finalizing orders.

Selection Notes

Select this component when circuit requirements demand high thermal stability and low noise levels. The DO-35 package suits through-hole designs needing compact axial mounting. Evaluate the 500 mW power dissipation limit against expected thermal loads to ensure safe operation within the specified temperature range without excessive derating.

Part Context

This part belongs to the 1N49xx series of temperature-compensated Zener diodes manufactured by Microchip Technology. These devices utilize double plug construction to achieve superior voltage stability compared to standard Zener diodes. The series is engineered for applications where reference accuracy must remain consistent despite significant environmental temperature fluctuations.

Replacement Considerations

Consult official Microchip cross-reference guides for verified equivalent parts. Generic replacements may not match the specific temperature compensation characteristics or noise profiles required for precision reference applications.