1N4736A

Overview

The SMC Diode Solutions 1N4736A is a silicon planar Zener diode designed for voltage regulation and reference applications. It features a nominal Zener voltage of 6.8 V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 1 W at an ambient temperature of 50°C, utilizing the DO-41 axial leaded package. Key electrical characteristics include a maximum reverse leakage current of 10 µA at the rated voltage and a Zener impedance of 3.5 Ω measured at a test current of 37 mA. The component supports a maximum operating junction temperature of 175°C.

Feature Summary

• Provides stable voltage regulation through controlled avalanche breakdown in the reverse bias region.
• Utilizes a glass passivated junction to ensure long-term reliability and environmental stability.
• Engineered for high surge current handling capabilities within the specified thermal limits.

Applications

• Voltage reference circuits requiring precise potential levels.
• Overvoltage protection stages in low-power electronic systems.
• Clamping applications for transient suppression in signal paths.

Procurement Notes

Verify the specific manufacturer designation when sourcing, as the 1N4736A part number is utilized by multiple semiconductor producers including Microchip, onsemi, and Littelfuse/SMC. Confirm that the received component matches the required DO-41 package dimensions and pin configuration. Ensure the datasheet aligns with the specific electrical tolerances and thermal ratings needed for the target application environment before finalizing procurement.

Selection Notes

Select this component for designs requiring a standard 6.8 V reference point with moderate power handling. The DO-41 package facilitates through-hole mounting, suitable for prototyping or industrial equipment where mechanical robustness is prioritized over miniaturization. Evaluate the thermal management requirements to ensure the 1 W dissipation rating remains within safe operating limits under worst-case load conditions.

Part Context

The 1N4736A belongs to the widely recognized 1N47xx series of Zener diodes, established decades ago as industry standards for voltage regulation. While originally defined by JEDEC specifications, the part number is now licensed across various manufacturers. SMC Diode Solutions produces this variant using planar technology, maintaining compatibility with legacy circuit designs while offering modern manufacturing consistency and quality control protocols.

Replacement Considerations

Direct substitutes include the 1N4736A manufactured by Microchip Technology, onsemi, and Littelfuse. Cross-referencing is essential to verify identical Zener voltage, impedance, and package footprint. Surface-mount equivalents such as the MLL4736A may be considered if board space constraints require a transition from axial leads to MELF packaging.