1N4899/TR

Overview

The Microchip Technology 1N4899/TR 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 (DO-204AA) axial through-hole package and dissipates up to 400 mW of power. Key electrical characteristics include a maximum reverse leakage current of 15 µA, a Zener impedance of 25 Ohms at a test current of 7.5 mA, and an exceptionally low voltage temperature coefficient of 0.005 %/°C. It supports a wide operating temperature range from -65°C to +175°C.

Feature Summary

• Temperature compensated design ensures stable voltage regulation across extreme thermal variations
• Low voltage temperature coefficient minimizes drift in precision reference circuits
• Robust high-temperature operation capability suitable for demanding industrial environments

Applications

• Precision voltage reference sources requiring minimal thermal drift
• Temperature-compensated regulator circuits in harsh environments
• High-reliability industrial instrumentation and control systems

Procurement Notes

Verify the specific suffix configuration against official Microchip documentation to ensure compatibility with required packaging and compliance standards. Confirm that the component meets all necessary environmental certifications for the intended deployment region. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity and traceability before finalizing procurement orders.

Selection Notes

Select this component when circuit stability under varying thermal conditions is critical. The low temperature coefficient makes it superior to standard Zener diodes for precision references. Ensure the application current does not exceed the limits defined by the 400 mW power dissipation rating in the DO-7 package. Verify that the 12.8 V breakdown voltage aligns with the system's regulatory requirements.

Part Context

This component belongs to Microchip's legacy MIL-spec and commercial grade Zener diode portfolio. It is manufactured using established semiconductor processes to ensure long-term availability and reliability. The 1N4899 series is widely recognized in aerospace and defense sectors for its consistent performance and rugged construction in axial leaded packages.

Replacement Considerations

Consult official Microchip substitution guides for verified equivalents. Generic replacements may lack the specific temperature compensation characteristics or tight tolerance required for this application.