1N4738A-T

Overview

The Vishay 1N4738A-T is a silicon planar power Zener diode in the DO-41 (DO-204AL) package. It provides an 8.2 V nominal Zener voltage with a standard ±5% tolerance. The device operates at a test current of 31 mA and dissipates up to 1.3 W of power. Key electrical parameters include a maximum reverse leakage current of 10 µA, a typical dynamic resistance of 6 Ω, and a surge current rating of 550 mA. It supports junction temperatures up to 175 °C.

Feature Summary

• Silicon planar construction for high power stabilization
• Glass passivated junction for reliability
• Standardized ±5% voltage tolerance

Applications

• Voltage stabilization circuits
• High power clipping applications

Procurement Notes

Verify the specific ordering code suffix against the manufacturer's official documentation to confirm packaging details. Confirm compliance definitions via the provided Vishay material categorization link. Ensure lead temperature requirements are met during soldering to maintain component integrity.

Selection Notes

Select this component for applications requiring stable voltage regulation within the 8.2 V range. Consider the 1.3 W power dissipation capability and thermal resistance when designing heat management solutions. Verify that the operating environment remains within the specified -65 °C to +175 °C storage temperature range.

Part Context

This part belongs to the Vishay 1N4728A through 1N4761A series of 1 Watt Zener diodes. The series covers a wide voltage selection from 3.3 V to 75 V. These components utilize a glass passivated junction and are designed for general-purpose voltage regulation tasks in electronic circuits.

Replacement Considerations

Cross-reference with other manufacturers' 1N4738A equivalents. Verify that substitute parts match the 8.2 V nominal voltage, 1.3 W power rating, and DO-41 package dimensions to ensure mechanical and electrical compatibility.

FAQ

What is the maximum forward voltage?

The maximum forward voltage is 1.2 V at a forward current of 200 mA.

What is the thermal resistance junction-to-ambient?

The thermal resistance junction-to-ambient is 110 K/W, valid provided electrodes at a distance of 4 mm from the case are kept at ambient temperature.