1N4918/TR

Overview

The Microchip Technology 1N4918/TR is a temperature-compensated Zener diode designed for precision voltage regulation. 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 leaded package and dissipates up to 400 mW. Key electrical parameters include a maximum reverse leakage current of 15 µA, a Zener impedance of 25 Ohms, and a test current of 7.5 mA. It supports an extended operating temperature range from -65°C to +175°C.

Feature Summary

• Temperature compensated design ensures stable voltage regulation across wide thermal variations
• High reliability construction suitable for demanding industrial environments
• Precision voltage reference capability with tight manufacturing tolerances

Applications

• Precision voltage reference circuits requiring thermal stability
• Industrial control systems operating under extreme temperature conditions
• Test and measurement equipment calibration standards

Procurement Notes

Verify the specific suffix /TR indicates reel packaging when ordering. Confirm the manufacturer part number matches exactly as Microchip Technology sources these components. Ensure the required voltage tolerance aligns with the standard 5% specification provided in official datasheets. Check for any recent production change notices regarding package or material composition updates before finalizing procurement plans.

Selection Notes

Select this component when a stable 12.8 V reference is needed in high-temperature applications. The DO-7-2 package suits through-hole designs. Compare against non-compensated variants if thermal drift is not a primary constraint. Verify that the 400 mW power dissipation rating meets the circuit's thermal requirements under worst-case load conditions.

Part Context

This component belongs to the 1N49xx series of temperature-compensated Zener diodes manufactured by Microchip Technology. These devices are engineered to minimize voltage drift over temperature, making them distinct from standard Zener diodes. The series is widely used in applications where precise voltage levels must be maintained despite significant environmental thermal fluctuations.

Replacement Considerations

Public confirmed substitutes include JAN1N4918CUS, JAN1N4918DUS, JANTX1N4918CUS, and JANTX1N4918DUS. Verify that alternative parts match the 12.8 V nominal voltage and 400 mW power rating. Ensure the replacement package type is compatible with the existing PCB footprint.