1N4746AE3/TR13

Overview

The Microchip Technology 1N4746AE3/TR13 is a silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 18 V with a tolerance of 5%. The device supports a power dissipation of 1 W and operates within a temperature range from -65 °C to +175 °C. Packaged in the DO-213AB (MELF) format, it utilizes surface-mount technology. Key electrical characteristics include a maximum reverse leakage current of 100 nA, a Zener impedance of 20 Ohms, and a test current of 14 mA.

Feature Summary

• Provides stable voltage regulation using a single silicon Zener junction
• Capable of handling high thermal loads with a 1 W power dissipation rating
• Engineered for extended operational stability across extreme industrial temperature ranges

Applications

• Precision voltage reference circuits requiring stable DC levels
• Overvoltage protection stages in sensitive electronic systems
• Clamping applications in signal processing paths

Procurement Notes

Verify the specific suffix configuration against official Microchip documentation to ensure compatibility with required packaging and compliance standards. Confirm that the MELF package variant meets the mechanical constraints of the target PCB layout. Cross-reference the RoHS status and manufacturing origin details directly with the supplier to align with project regulatory requirements before finalizing procurement orders.

Selection Notes

Select this component when a robust 18 V regulation point is needed in a compact surface-mount form factor. The wide operating temperature range makes it suitable for harsh environments where standard commercial-grade diodes may fail. Ensure the circuit design accounts for the specified Zener impedance and test current conditions to maintain accuracy under varying load conditions.

Part Context

This part belongs to the established 1N4746 series of Zener diodes, widely recognized for reliability in industrial electronics. The E3 designation indicates lead-free construction compliant with environmental directives. The TR13 suffix specifies tape-and-reel packaging optimized for automated surface-mount assembly processes, distinguishing it from bulk or axial variants within the same family.

Replacement Considerations

Direct substitutes include the CDLL4746A/TR and 1N4746AUR/TR, which share identical electrical specifications and the DO-213AB MELF package. Verify pinout orientation and hermetic sealing requirements if replacing non-hermetic versions with hermetic equivalents in critical aerospace or military applications.