1N4738A

Overview

The SMC Diode Solutions 1N4738A is a silicon planar Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 8.2V with a 5% tolerance and a maximum power dissipation of 1W at 25°C ambient temperature. The device utilizes a DO-41 glass axial leaded package, ensuring reliable performance in through-hole mounting configurations. Key electrical characteristics include a maximum reverse leakage current of 10µA at 6V and a Zener impedance of 4.5 Ohms at a test current of 31mA. The component supports a wide operating temperature range from -65°C to +200°C junction temperature.

Feature Summary

• Glass passivated junction construction for high reliability and stability
• Low Zener impedance and low regulation factor for precise voltage control
• Guaranteed high-temperature soldering capability up to 260°C

Applications

• General purpose voltage regulation circuits
• Reference voltage sources in electronic systems
• Overvoltage protection stages

Procurement Notes

Verify the specific manufacturer source when sourcing this part number, as it is produced by multiple vendors including SMC Diode Solutions, Vishay, onsemi, and Micro Commercial Components. Confirm that the received component matches the required DO-41 package and 8.2V specification. Check for RoHS compliance status if environmental regulations apply to your assembly process. Ensure the supplier provides valid datasheets confirming the 5% voltage tolerance and 1W power rating.

Selection Notes

Select this component for designs requiring a standard 8.2V reference point with moderate power handling capabilities. The DO-41 package is suitable for manual or automated through-hole assembly processes. Consider the thermal resistance and ambient temperature conditions to ensure the 1W power dissipation limit is not exceeded during operation. Verify compatibility with existing circuit board layouts designed for axial lead components.

Part Context

The 1N4738A belongs to the widely recognized 1N47xx series of Zener diodes, which are industry-standard components for basic voltage regulation tasks. This series offers a broad range of voltage values, with the 1N4738A specifically providing an 8.2V breakdown voltage. The DO-41 glass package is a legacy form factor still prevalent in industrial and consumer electronics due to its robustness and ease of use in traditional PCB designs.

Replacement Considerations

• 1N4738A-E1 (Vishay)
• 1N4738ATR (onsemi)
• 1N4738A-TP (Micro Commercial Components)