1N4738ATR

Overview

The onsemi 1N4738ATR is a single silicon Zener diode designed for voltage regulation and reference applications. It features an 8.2 V nominal Zener voltage with a ±5% tolerance, tested at 31 mA. The device dissipates up to 1 W of power in the DO-41 through-hole package. Key electrical characteristics include a maximum reverse leakage current of 10 µA and a Zener impedance of 4.5 Ω. It operates reliably within a temperature range of -65°C to +200°C.

Feature Summary

• Provides stable voltage regulation using a glass-passivated junction design.
• Capable of handling high surge currents while maintaining low dynamic impedance.
• Supports high-temperature soldering processes without compromising performance.

Applications

• Voltage regulation in power supply circuits
• Reference voltage generation for analog systems
• Overvoltage protection for sensitive electronic components

Procurement Notes

Verify the specific manufacturer part number against official onsemi documentation to ensure compatibility with your design requirements. Confirm that the DO-41 axial leaded package matches your PCB footprint and mounting constraints. Check for any RoHS compliance updates or environmental declarations relevant to your region's regulations before finalizing procurement.

Selection Notes

Select this component when a precise 8.2 V reference is required with moderate power handling capabilities. Ensure the circuit design accounts for the 1 W power dissipation limit at elevated ambient temperatures. Verify that the 4.5 Ω impedance meets the noise and stability requirements of the application compared to lower-impedance alternatives.

Part Context

This component belongs to the standard 1N47 series of Zener diodes, widely used in general-purpose electronics. The 'ATR' suffix typically indicates a tape-and-reel packaging format suitable for automated assembly processes. It serves as a fundamental discrete semiconductor device for basic voltage clamping and regulation tasks across various industrial and consumer applications.

Replacement Considerations

Cross-reference with other manufacturers offering the 1N4738A specification in DO-41 packages. Verify pinout orientation and thermal resistance values match the original design intent. Ensure substitute parts meet the same ±5% voltage tolerance and 1 W power rating standards.