1N4917A/TR

Overview

The Microchip Technology 1N4917A/TR is a temperature-compensated Zener diode designed for precision voltage reference applications. It features a nominal Zener voltage of 19.2 V with a tight tolerance of ±5%. The device operates in the DO-35 (DO-204AH) axial through-hole package and dissipates up to 500 mW of power. Key electrical characteristics include a maximum reverse leakage current of 15 µA, a Zener impedance of 25 Ω at a test current of 7.5 mA, and a low voltage temperature coefficient of 0.01 %/°C. It supports an operating temperature range from -65 °C to +175 °C.

Feature Summary

• Temperature compensated design ensures stable voltage regulation across wide thermal variations
• High precision voltage reference capability with tight manufacturing tolerance
• Robust high-temperature operation suitable for demanding industrial environments

Applications

• Precision voltage reference circuits requiring thermal stability
• Temperature compensation networks in analog signal conditioning
• Overvoltage protection in sensitive electronic instrumentation

Procurement Notes

Verify the specific suffix TR indicates tape-and-reel packaging configuration when ordering. Confirm RoHS compliance status as non-compliant variants may exist within the same part family. Ensure the DO-35 lead form matches the target PCB footprint requirements. Cross-reference the manufacturer datasheet for exact testing conditions regarding leakage and impedance parameters before final integration.

Selection Notes

Select this component when a stable 19.2 V reference is required under varying thermal loads. The low temperature coefficient makes it superior to standard Zener diodes for precision applications. Consider the 500 mW power rating against expected dissipation levels. The through-hole package is suitable for prototyping or high-reliability manual assembly processes where surface mount alternatives are not preferred.

Part Context

This component belongs to Microchip's legacy discrete diode portfolio, specifically the 1N49xx series of temperature-compensated Zener diodes. These devices are engineered to maintain consistent performance in harsh environments. The 1N4917A variant provides a specific voltage point optimized for compensation applications, distinguishing it from general-purpose rectifiers or standard voltage regulators.

Replacement Considerations

Public confirmed substitute part numbers: 1N4993US.TR, 1N4717/TR.