1N4747A-T

Overview

The 1N4747A-T is a single silicon unidirectional voltage regulator diode manufactured by Vishay General Semiconductor - Diodes Division. It features a nominal Zener voltage of 20 V with a tolerance of ±5%. The device is designed for through-hole mounting in a DO-41 axial glass package, offering a power dissipation rating of 1 W. Key electrical characteristics include a maximum reverse leakage current of 5 µA and a Zener impedance of 22 Ω at a test current of 12.5 mA. The component operates within a temperature range of -65 °C to +200 °C.

Feature Summary

• Provides stable voltage regulation via Zener breakdown mechanism
• Utilizes glass passivation for environmental protection
• Designed for high thermal stability in axial configurations

Applications

• Voltage reference circuits
• Overvoltage protection stages
• Clipping and clamping applications

Procurement Notes

Verify the specific manufacturer designation when sourcing, as the 1N4747A part number is utilized by multiple semiconductor producers including onsemi, STMicroelectronics, and CDIL. Confirm that the suffix '-T' corresponds to the intended packaging format from the specific vendor's datasheet. Ensure compliance with RoHS and REACH requirements relevant to the manufacturing origin. Cross-reference the exact electrical parameters against the official datasheet provided by the supplier to guarantee compatibility with the design specifications.

Selection Notes

Select this component for applications requiring a precise 20 V reference point with moderate power handling capabilities. The DO-41 package suits standard through-hole PCB layouts. Consider the 22 Ω dynamic impedance when designing for low-noise sensitivity. Evaluate the thermal management requirements given the 1 W dissipation limit and the specified operating temperature range up to 200 °C.

Part Context

This component belongs to the standard 1N47xx series of Zener diodes, widely recognized for general-purpose voltage regulation. The series covers a broad range of voltage values, with the 1N4747A specifically targeting the 20 V segment. It is a legacy part number maintained across various manufacturers to ensure interchangeability in established electronic designs.

Replacement Considerations

Direct substitutes include 1N4747A from onsemi, STMicroelectronics, or CDIL. Equivalent parts from Vishay may carry suffixes such as -TR or -TAP depending on reel configuration. Verify pinout and package dimensions match the DO-41 standard before substitution.