1N4746A BK PBFREE

Overview

The Central Semiconductor Corp 1N4746A BK PBFREE is a silicon Zener diode designed for voltage regulation in industrial, commercial, entertainment, and computer applications. It features a nominal Zener voltage of 18 V with a ±5% tolerance. The device operates within a temperature range of -65°C to +200°C and dissipates up to 1.0 W at 50°C ambient. Key electrical parameters include a maximum reverse current of 5.0 μA at 13.7 V, a maximum Zener impedance of 20 Ω at the test current of 14 mA, and a DC current limit of 13.7 mA.

Feature Summary

• Provides stable voltage regulation using silicon technology
• Designed for high-temperature operation up to 200°C
• Offers tight voltage tolerance for precision circuits

Applications

• Industrial equipment voltage regulation
• Commercial electronics power supplies
• Computer system circuit protection

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm plating options and compliance status. Confirm availability through authorized distributors as stock levels fluctuate. Ensure the component meets RoHS requirements if applicable to your manufacturing process. Cross-reference datasheet revisions to ensure compatibility with existing designs.

Selection Notes

Select this component when a 18 V reference is required in a DO-41 axial package. Consider the 1.0 W power dissipation capability and the wide operating temperature range for harsh environments. Verify that the 20 Ω impedance and 5.0 μA leakage meet the specific circuit constraints. Compare against other manufacturers' equivalents if supply chain diversification is necessary.

Part Context

This part belongs to the 1N4728A through 1N4764A series of 1-watt silicon Zener diodes. The series covers a voltage range from 3.3 V to 100 V with consistent 5% tolerance across all variants. These components are widely used in general-purpose voltage regulation tasks where standard axial packaging is preferred for through-hole mounting.

Replacement Considerations

Publicly confirmed parameter-equivalent substitutes include 1N4746A from onsemi, Microchip Technology, and Nexperia USA Inc.