1N4747AGE3

Overview

The Microchip Technology 1N4747AGE3 is a hermetically sealed Zener diode designed for high-reliability applications. It features a nominal Zener voltage of 20 V with a tight tolerance of 2%. The device operates in the DO-213AB MELF package and dissipates up to 1 W of power. Key electrical characteristics include a maximum dynamic impedance of 22 Ω and a test current of 12.5 mA. It supports an extended operating temperature range from -65 °C to +175 °C, ensuring stability in demanding environments.

Feature Summary

• Hermetic sealing provides enhanced protection against environmental contaminants and moisture ingress.
• Tight 2% voltage tolerance ensures precise regulation performance in sensitive circuits.
• Extended thermal capability allows reliable operation at junction temperatures up to 175 °C.

Applications

• Military and aerospace electronic systems requiring radiation and environmental hardness
• High-reliability industrial control equipment
• Precision voltage reference circuits in critical infrastructure

Procurement Notes

Verify the specific suffix 'AGE3' to confirm RoHS compliance and tin-lead termination specifications. Ensure procurement channels are authorized to guarantee authenticity for hermetically sealed components. Confirm that the 2% tolerance variant meets the design requirements, as standard commercial versions may differ. Validate package integrity upon receipt due to the hermetic nature of the DO-213AB housing.

Selection Notes

Select this component when strict voltage accuracy and environmental durability are required. The 2% tolerance distinguishes it from standard 5% variants suitable for general-purpose use. Consider the MELF package for automated surface-mount assembly where space is constrained but reliability is paramount. Evaluate thermal management needs given the 1 W dissipation rating and high-temperature operational limits.

Part Context

This part belongs to the 1N4747 series of Zener diodes manufactured by Microchip Technology. It represents a specialized, high-reliability version of the standard 1N4747A, distinguished by its hermetic glass encapsulation and tighter voltage tolerance. The series is widely recognized for robust performance in harsh conditions, offering superior longevity compared to non-sealed equivalents.

Replacement Considerations

Direct substitutes include other hermetically sealed 20V Zener diodes in the DO-213AB package with comparable 2% tolerance and 1W power ratings. Verify pinout compatibility and thermal resistance values before substitution. Non-hermetic equivalents like the standard 1N4747A may be used only if environmental exposure is controlled and loose tolerance is acceptable.