1N4917/TR

Overview

The 1N4917/TR is a temperature-compensated Zener reference diode manufactured by Microchip Technology. It features a nominal Zener voltage of 19.2 V with a tight tolerance of ±5%. The device is designed for low-noise applications and utilizes metallurgically bonded double plug construction to ensure stability. It operates in the DO-204AH (DO-35) through-hole package, supporting a power dissipation of 500 mW. The component exhibits a maximum reverse leakage current of 15 µA and a Zener impedance of 600 Ohms. It functions reliably within an operating temperature range from -65 °C to +175 °C.

Feature Summary

• Temperature compensated design for stable voltage reference performance across varying thermal conditions
• Metallurgically bonded double plug construction ensuring mechanical integrity and long-term reliability
• Low noise characteristics suitable for precision analog circuitry and sensitive measurement applications

Applications

• Precision voltage reference circuits requiring high thermal stability
• Temperature compensation networks in analog signal processing systems
• Low-noise power supply regulation and monitoring applications

Procurement Notes

Verify the specific suffix /TR indicates tape and reel packaging configuration when sourcing. Confirm RoHS compliance status as documentation may vary by production batch. Ensure the DO-35 package dimensions match the target PCB footprint requirements. Validate that the 19.2 V nominal voltage aligns with the system's reference voltage specifications before integration.

Selection Notes

Select this component when a stable, low-noise voltage reference is required over a wide temperature range. The ±5% tolerance provides sufficient accuracy for general precision applications without the cost of tighter grades. The through-hole DO-35 package facilitates easy prototyping and manual assembly. Consider the 500 mW power rating to ensure adequate thermal headroom in the final enclosure design.

Part Context

This part belongs to Microchip's legacy single Zener diode portfolio, specifically optimized for reference applications rather than standard voltage regulation. The 1N4917 designation identifies the 19.2 V temperature-compensated variant within the series. These devices are commonly used in instrumentation where drift must be minimized. The /TR suffix denotes the specific shipping format for automated placement equipment.

Replacement Considerations

Direct replacements include other manufacturers' 1N4917 equivalents meeting the same 19.2 V and ±5% tolerance specifications. Verify that substitute components maintain the same DO-35 package outline and pinout compatibility. Ensure replacement parts offer comparable Zener impedance and leakage current characteristics to preserve circuit noise performance.