1N4747A_T50R

Overview

The onsemi 1N4747A_T50R is a Zener diode with a nominal voltage of 20 V and a tolerance of ±5%. It operates within a junction temperature range of -65°C to +200°C. The device features a maximum power dissipation of 1.0 W at lead temperatures up to 50°C, derating by 6.67 mW/°C above this threshold. Electrical characteristics include a maximum Zener impedance (ZZ) of 12.5 Ω at the test current (IZ) of 25 mA, and a leakage current (IR) of 0.25 µA at a reverse voltage (VR) of 5 V. Non-repetitive peak reverse current (IZSM) is rated at 225 mA.

Feature Summary

• Provides stable voltage regulation through Zener breakdown mechanism in the reverse bias region.
• Utilizes a glass case package for robust environmental protection and thermal stability.
• Designed for high-temperature operation with an extended junction temperature range.

Applications

• Voltage reference circuits requiring precise potential levels.
• Overvoltage protection stages in electronic systems.
• Clamping applications to limit signal amplitude peaks.

Procurement Notes

Verify the specific ordering suffix matches the required packaging configuration. Confirm that the component meets all applicable industry standards and reliability requirements for the intended deployment environment. Ensure compatibility with existing circuit board layouts and thermal management strategies before finalizing procurement decisions.

Selection Notes

Select this component based on the required Zener voltage tolerance and power dissipation capabilities. Evaluate the thermal derating curve to ensure adequate heat sinking or airflow conditions are present. Consider the package type and pinout compatibility with the target assembly process and mechanical constraints.

Part Context

This part belongs to the 1N4728A-1N4758A series of Zener diodes manufactured by onsemi. The series offers a wide range of voltage ratings from 3.3 V to 56 V, all housed in the DO-41 glass case. These devices are designed for general-purpose voltage regulation and protection applications across various industrial and consumer electronics sectors.

Replacement Considerations

Cross-reference with other manufacturers offering equivalent 20V Zener diodes in DO-41 packages. Verify matching electrical parameters such as Zener impedance, leakage current, and power rating. Ensure physical dimensions and marking conventions align with existing inventory or design specifications.