1N4747A BK TIN/LEAD

Overview

The Central Semiconductor Corp 1N4747A BK TIN/LEAD is a silicon unidirectional voltage regulator diode designed for through-hole mounting in the DO-41 axial package. It features a nominal Zener voltage of 20 V with a tolerance of ±5%. The device supports a maximum power dissipation of 1 W and operates within a junction temperature range of -65°C to +200°C. Key electrical characteristics include a test current of 12.5 mA, a maximum reverse leakage current of 5 µA, and a maximum Zener impedance of 22 Ω.

Feature Summary

• Utilizes glass passivated silicon planar construction for reliable voltage regulation
• Supports high thermal stability with an extended operating temperature range up to 200°C
• Provides precise voltage control with tight manufacturing tolerances

Applications

• General purpose voltage regulation circuits
• Power supply reference voltage generation
• Overvoltage protection stages

Procurement Notes

Verify the specific manufacturer designation, as the 1N4747A part number is produced by multiple semiconductor vendors including onsemi, CDIL, and Taiwan Semiconductor. Confirm that the Central Semiconductor variant matches the required pinout and physical dimensions for your PCB layout. Ensure compliance with RoHS directives if applicable to your assembly process, noting that tin/lead terminations may be restricted in certain jurisdictions.

Selection Notes

Select this component when a standard 20 V regulation point is required in a high-power axial package. The DO-41 form factor allows for robust mechanical mounting compared to smaller surface-mount alternatives. Consider the 1 W power rating and thermal resistance when designing heat dissipation strategies for continuous operation at elevated ambient temperatures.

Part Context

This component belongs to the widely recognized 1N47 series of power Zener diodes. The series covers a broad spectrum of voltage ratings from 3.3 V to 82 V, all sharing similar DO-41 packaging and 1 W power handling capabilities. This standardized approach facilitates easy substitution across various electronic designs requiring stable DC voltage references.

Replacement Considerations

Verified equivalent part numbers include 1N4747A manufactured by onsemi, CDIL, and Taiwan Semiconductor. These parts share identical electrical specifications and mechanical footprint, allowing for direct replacement in existing designs without circuit modification.