1N4734A

Overview

The Fairchild Semiconductor 1N4734A is a silicon unidirectional Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 5.6V with a standard tolerance of 5%. The device is rated for a power dissipation of 1W at an ambient temperature of 25°C, with a derating factor of 6.67 mW/°C above this threshold. It utilizes a DO-41 glass axial leaded package and operates within a junction and storage temperature range of -65°C to +200°C. Key electrical characteristics include a maximum dynamic impedance of 5Ω and a typical reverse leakage current of less than 5.0µA.

Feature Summary

• Glass passivated die construction ensures stable performance and reliability under various operating conditions.
• High power dissipation capability of 1W allows effective thermal management in through-hole circuit designs.
• Low inductance design supports efficient operation in high-frequency switching and signal processing environments.

Applications

• Voltage reference circuits requiring precise potential levels
• Overvoltage protection stages in electronic systems
• Clamping applications for transient suppression

Procurement Notes

Verify the specific manufacturer source, as Fairchild Semiconductor was acquired by ON Semiconductor. Confirm RoHS compliance status, as legacy stock may differ from current production runs. Ensure the package type matches the required DO-41 specification for your PCB layout. Check datasheets for any updates regarding testing currents or impedance values that may vary between original Fairchild and subsequent ON Semiconductor manufacturing batches.

Selection Notes

Select this component when a 5.6V regulation point is required with high power handling capabilities. The DO-41 package is suitable for through-hole mounting where higher thermal mass is beneficial. Consider the 5% tolerance if tighter voltage precision is not critical. Evaluate the operating temperature range to ensure compatibility with extreme environmental conditions up to 200°C.

Part Context

The 1N4734A belongs to the widely used 1N47xx series of Zener diodes, which are standard components for low-to-medium power voltage regulation. This series is characterized by its robust glass encapsulation and axial lead configuration, making it a staple in industrial and consumer electronics for decades. The 5.6V rating is a common reference voltage in analog circuit design.

Replacement Considerations

Equivalent parts include the Microchip Technology 1N4734A/TR and Nexperia 1N4734A,133. These alternatives maintain the same 5.6V Zener voltage and 1W power rating within the DO-41 package. Verify pinout compatibility and thermal derating curves before substitution to ensure identical performance in the target application.