1N4903

Overview

The Microchip Technology 1N4903 is a temperature-compensated Zener diode designed for precision voltage regulation applications. It features a nominal Zener voltage of 12.8 V with a tight tolerance of 5%. The device operates in the DO-7-2 axial through-hole package, supporting a maximum power dissipation of 400 mW. Key electrical characteristics include a test current of 2 mA and a low reverse leakage current of 15 uA. The component exhibits a voltage temperature coefficient of 0.01 %/C, ensuring stable performance across an operating temperature range from -65 C to +175 C.

Feature Summary

• Temperature compensated design ensures minimal voltage drift over wide thermal ranges
• High stability provided by precise 5% voltage tolerance specification
• Robust construction supports operation in extreme environmental conditions

Applications

• Precision reference voltage sources requiring high thermal stability
• Voltage regulation circuits in harsh industrial environments
• Test and measurement instrumentation calibration standards

Procurement Notes

Verify the specific suffix designation against official datasheets to confirm temperature compensation status, as standard variants may differ. Confirm RoHS compliance requirements prior to ordering, as historical production runs may vary. Ensure the procurement channel provides traceability documentation consistent with aerospace or military specifications if required by the application. Cross-reference the manufacturer part number with authorized distributor catalogs to validate current availability and manufacturing status.

Selection Notes

Select this component when circuit designs demand superior thermal stability compared to standard Zener diodes. The 12.8 V output level suits applications requiring specific reference points without additional scaling. Consider the DO-7-2 package dimensions for PCB layout constraints. Evaluate the 400 mW power rating against expected dissipation levels to ensure safe operating margins under all load conditions.

Part Context

This component belongs to Microchip's legacy discrete semiconductor portfolio, specifically within the Zener diode category. It serves as a specialized variant optimized for temperature-sensitive operations, distinguishing it from general-purpose regulation devices. The product line maintains compatibility with established through-hole mounting techniques used in reliable electronic systems.

Replacement Considerations

Consult official substitution guides for equivalent temperature-compensated Zener diodes with matching 12.8 V ratings. Verify that alternative components meet the same 5% tolerance and thermal coefficient specifications to maintain circuit accuracy.