1N4728A TR

Overview

The Central Semiconductor Corp 1N4728A TR is a silicon Zener diode designed for voltage regulation. It features a nominal Zener voltage of 3.3 V with a 5% tolerance, tested at 76 mA. The device operates in the DO-41 axial package and dissipates up to 1.0 W at 50°C ambient temperature. Key electrical parameters include a maximum Zener impedance of 10 Ω at test current and 400 Ω at knee current, a reverse leakage current of 100 μA at 1.0 V, and a DC current limit of 1380 mA. The component supports an operating and storage temperature range from -65°C to +200°C.

Feature Summary

• Hermetically sealed glass passivated junction construction
• High reliability design suitable for industrial and commercial applications
• Axial leaded configuration for through-hole mounting

Applications

• Industrial voltage regulation circuits
• Commercial power supply protection
• Entertainment equipment power management
• Computer system voltage reference

Procurement Notes

Verify procurement status carefully as this specific part number has been classified as End of Life (EOL) by the manufacturer. Confirm availability of remaining stock or alternative sourcing channels before finalizing orders. Check for any extended shipment windows or minimum order quantity requirements associated with last-time buy inventory.

Selection Notes

Select this component only if the specific 3.3 V Zener voltage and 1.0 W power dissipation align with circuit requirements. Ensure the DO-41 package size fits the board layout constraints. Consider that the EOL status may impact long-term supply continuity, necessitating evaluation of future production needs against available stock levels.

Part Context

This component belongs to the 1N4728A series of 1-watt silicon Zener diodes manufactured by Central Semiconductor Corp. The series covers a voltage range from 3.3 V to 100 V with 5% tolerance. These devices are characterized by their robust glass passivation and wide thermal operating range, making them suitable for demanding environments where stable voltage regulation is critical.

Replacement Considerations

No direct replacement part numbers are listed by the manufacturer for the 1N4728A TR. Contact [email protected] for assistance in locating alternate sources or equivalent components from other manufacturers.