1N4730A

Overview

The Fairchild Semiconductor 1N4730A is a silicon planar power Zener diode designed for voltage regulation and clipping applications. It features a nominal Zener voltage of 3.9 V with a tolerance of ±5%. The device dissipates 1 W of power at 25°C ambient temperature, derating linearly above this threshold. Key electrical parameters include a maximum reverse leakage current of 10 µA at 1 V, a Zener impedance of 9 Ohms, and a test current of 64 mA. It operates within a temperature range of -65°C to +200°C and utilizes the DO-41 glass axial lead package.

Feature Summary

• Utilizes silicon planar technology for robust voltage regulation performance
• Provides stable DC voltage reference in stabilizing and clipping circuits
• Features high thermal stability with extended operating temperature range

Applications

• DC voltage stabilization in power supply circuits
• Signal waveform clipping and limiting
• Voltage reference generation in electronic systems

Procurement Notes

Verify component authenticity through official Fairchild or authorized distributor channels due to historical manufacturing status. Confirm RoHS compliance requirements against specific project standards, as legacy variants may differ. Ensure proper handling procedures are followed during installation to maintain junction integrity and prevent electrostatic discharge damage during assembly processes.

Selection Notes

Select this component when a precise 3.9 V regulation point is required with moderate power dissipation capabilities. The DO-41 package suits through-hole mounting constraints where space permits. Consider thermal derating factors if ambient temperatures exceed standard limits. Evaluate alternative manufacturers only if equivalent electrical characteristics and mechanical dimensions match the original design specifications exactly.

Part Context

This part belongs to the 1N47xx series of one-watt Zener diodes widely used in general-purpose electronics. Fairchild Semiconductor was a primary supplier before its acquisition by onsemi. The 1N4730A specifically targets low-voltage regulation needs within this family, offering a balance between voltage precision and power handling suitable for industrial and consumer applications requiring reliable voltage clamping.

Replacement Considerations

Equivalent parts include the onsemi 1N4730A-T50A and Micro Commercial Components 1N4730A-TP. Verify pinout compatibility and package dimensions (DO-41) before substitution. Ensure replacement devices meet the same ±5% voltage tolerance and 1 W power rating to maintain circuit performance without modification.