1N4739A

Overview

The SMC Diode Solutions 1N4739A is a silicon planar Zener diode designed for voltage regulation and reference applications. It features a nominal Zener voltage of 9.1 V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 1 W at ambient temperatures up to +50°C, derating linearly thereafter. It utilizes the DO-41 axial leaded package, suitable for through-hole mounting. Key electrical characteristics include a maximum reverse leakage current of 10 µA at 7 V and a dynamic impedance of 5 Ω at the test current of 28 mA. The component operates within a junction temperature range of -65°C to +200°C.

Feature Summary

• Provides stable voltage regulation using silicon planar technology
• Offers precise voltage tolerance for accurate reference circuits
• Supports high thermal stability with extended operating temperature range

Applications

• Voltage regulation in power supply circuits
• Overvoltage protection for sensitive electronic components
• Reference voltage sources in measurement instruments

Procurement Notes

Verify the specific manufacturer marking and datasheet revision when sourcing from SMC Diode Solutions, as specifications may vary slightly between production batches or legacy documentation versions. Confirm compliance with RoHS directives if required by your assembly process. Ensure the DO-41 package dimensions match your PCB footprint requirements before finalizing procurement decisions.

Selection Notes

Select this component when a standard 9.1 V regulation point is required in through-hole designs. Consider the 1 W power rating and thermal derating curves for high-temperature environments. Compare dynamic impedance and leakage current specifications against alternative manufacturers to ensure compatibility with precision circuit requirements.

Part Context

The 1N4739A belongs to the widely recognized 1N47xx series of Zener diodes, established for general-purpose voltage regulation. This series has been manufactured by numerous semiconductor companies for decades, ensuring broad industry familiarity and availability. The 1N4739A specifically targets the 9.1 V segment, a common value used in biasing and reference applications across various electronic systems.

Replacement Considerations

Direct replacements include Vishay 1N4739A, onsemi 1N4739A, Microchip 1N4739A, and Rectron 1N4739A. These parts share identical electrical parameters and DO-41 packaging, allowing for pin-compatible substitution in existing designs without circuit modification.