1N4919A/TR

Overview

The Microchip Technology 1N4919A/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 tolerance of ±5%. The device operates in the DO-35 (DO-204AH) axial through-hole package and dissipates up to 500 mW. Key electrical parameters include a maximum reverse leakage current of 15 µA, a Zener impedance of 25 Ohms 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 reference across wide thermal ranges
• Low noise characteristics suitable for sensitive analog circuitry
• High reliability construction with extended operating temperature capability

Applications

• Precision voltage reference circuits
• Temperature compensated regulator designs
• Low noise analog signal conditioning

Procurement Notes

Verify the specific suffix /TR indicates tape and reel packaging configuration when ordering. Confirm RoHS compliance status as required by project specifications. Ensure the DO-35 axial lead form factor matches the target PCB layout constraints. Validate that the 500 mW power dissipation rating aligns with the thermal management strategy of the final assembly.

Selection Notes

Select this component when a stable 19.2 V reference is required with minimal drift over temperature variations. The low Zener impedance and temperature coefficient make it superior to standard Zener diodes for precision tasks. Consider the axial package style for through-hole mounting requirements. Evaluate the 500 mW power handling against the expected bias current in the application circuit.

Part Context

This part belongs to the 1N49xx series of temperature compensated Zener diodes manufactured by Microchip Technology. These components are engineered to provide high stability and low noise performance compared to conventional Zener references. The series utilizes specialized doping profiles to achieve near-zero temperature coefficients around the breakdown voltage point.

Replacement Considerations

Cross-reference with other manufacturers' 1N4919 equivalents such as those from ON Semiconductor or Vishay. Verify that substitute parts maintain the same 19.2 V nominal voltage and DO-35 package dimensions. Ensure replacement components meet the same 0.01 %/°C temperature coefficient specification.