1N4734A

Overview

The SMC Diode Solutions 1N4734A is a silicon planar Zener diode designed for voltage regulation and reference applications. It features a glass passivated die construction within a DO-41 axial leaded package, ensuring reliable performance in through-hole mounting configurations. The device provides a nominal Zener voltage of 5.6 V with a standard tolerance of ±5%. It supports a maximum power dissipation of 1 W at ambient temperatures up to 75°C, de-rating linearly above this threshold. Key electrical characteristics include a maximum reverse leakage current of 5 µA at 2 V and a dynamic impedance of 5 Ω at the test current of 45 mA. The component operates across a junction temperature range of -65°C to +200°C.

Feature Summary

• Glass passivated die construction for enhanced environmental stability and long-term reliability
• High power dissipation capability of 1.0 Watt in a compact DO-41 axial package
• Low leakage current characteristics suitable for precision voltage reference circuits
• Compliant with UL flammability classification rating 94V-O for plastic case material

Applications

• Voltage regulation in DC power supply circuits
• Precision voltage reference sources in measurement instrumentation
• Overvoltage protection stages in electronic signal paths
• Clamping applications in transient suppression networks

Procurement Notes

Verify the specific manufacturer designation on the component marking, as the 1N4734A JEDEC number is utilized by multiple semiconductor producers. Confirm that the received units match the required package style (DO-41) and terminal finish specifications. Ensure compliance with relevant environmental directives such as RoHS if applicable to the target assembly. Cross-reference the supplier's datasheet for exact thermal derating curves and mechanical dimensions prior to PCB layout finalization.

Selection Notes

Select this component when a standard 5.6 V regulation point is required with moderate power handling capabilities. The DO-41 package offers robust mechanical stability for manual or automated through-hole insertion processes. Consider the ±5% voltage tolerance against circuit sensitivity requirements. Evaluate the thermal management strategy to ensure the junction temperature remains within the specified operating range during continuous conduction.

Part Context

The 1N4734A belongs to the widely adopted 1N47xx series of 1-watt Zener diodes, established under JEDEC standards. This series provides a comprehensive range of voltage options from 3.3 V to 100 V, facilitating standardized design practices across various industries. The 1N4734A specifically addresses the common 5.6 V requirement, which is frequently used in logic level shifting and reference applications due to its favorable temperature coefficient characteristics near this voltage value.

Replacement Considerations

Direct functional substitutes include the Vishay 1N4734A, Nexperia 1N4734A, and Microsemi MQ1N4734DPTR. Verify package compatibility and tolerance grades before substitution. Alternative manufacturers may offer slight variations in dynamic impedance or leakage current; review specific datasheets to ensure these parameters meet the original design constraints.