1N4747A TR PBFREE

Overview

The Central Semiconductor Corp 1N4747A TR PBFREE is a silicon Zener diode designed for voltage regulation. It features a nominal Zener voltage of 20 V with a ±5% tolerance, operating within a range of 19.00 V to 21.00 V. The device dissipates up to 1.0 W at 50°C and operates between -65°C and +200°C. Electrical characteristics include a maximum reverse current of 5.0 µA at 13.7 V, a test current of 12.5 mA, and a maximum Zener impedance of 22 Ω. It utilizes the DO-41 axial through-hole package.

Feature Summary

• Provides stable voltage regulation using silicon Zener technology
• Features low reverse leakage current for high reliability
• Designed for industrial, commercial, entertainment, and computer applications

Applications

• Industrial equipment voltage regulation
• Commercial power supply circuits
• Computer system protection
• Entertainment electronics control

Procurement Notes

Verify that the ordering suffix 'TR' corresponds to tape-and-reel packaging as indicated by distributor listings. Confirm the 'PBFREE' designation aligns with RoHS compliance requirements. Ensure the component matches the DO-41 through-hole form factor required by the target circuit board layout before finalizing procurement.

Selection Notes

Select this component when a precise 20 V reference is required in a through-hole design. The 1.0 W power rating supports moderate current loads. Verify that the 22 Ω maximum impedance meets the noise and stability requirements of the specific application environment compared to lower impedance alternatives.

Part Context

This part belongs to the 1N4728A through 1N4764A series of 1-watt silicon Zener diodes manufactured by Central Semiconductor. The series covers a wide voltage range from 3.3 V to 100 V with consistent 5% tolerance across all variants. The 1N4747A specifically addresses the 20 V segment of this standardized product line.

Replacement Considerations

Publicly confirmed substitute part numbers include 1N4746A and 1N4748A from Central Semiconductor. Cross-manufacturer equivalents such as those from onsemi or Nexperia may be considered if electrical parameters match exactly.