1N4746A G

Overview

The Microsemi Corporation 1N4746A G is a silicon unidirectional Zener voltage regulator diode designed for through-hole mounting. It features a DO-35 glass axial-leaded package and provides a nominal Zener voltage of 18 V with a tolerance of ±5%. The device supports a maximum power dissipation of 1 W at specified temperatures, with a test current of 14 mA and a maximum dynamic impedance of 20 Ohms. It operates within a temperature range of -65°C to +200°C and exhibits a maximum reverse leakage current of 5 µA.

Feature Summary

• Provides stable voltage regulation using a single silicon junction in a hermetically sealed glass body.
• Supports high-temperature operation up to 200°C suitable for demanding environments.
• Features internal metallurgical bonding options available via specific suffixes for enhanced reliability.

Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection in electronic systems
• Clamping applications in signal processing

Procurement Notes

Verify the exact suffix configuration when ordering, as it determines specific reliability attributes such as metallurgical bonding or RoHS compliance. Confirm that the required package type matches the design constraints, as variations exist between standard commercial and high-reliability versions. Ensure the selected variant meets all environmental and electrical specifications for the target application before finalizing procurement.

Selection Notes

Select this component for applications requiring robust voltage regulation in high-temperature environments. The DO-35 package offers a compact form factor for through-hole designs. Consider the specific suffix requirements for military or aerospace standards if higher reliability is necessary compared to standard commercial variants.

Part Context

This part belongs to the broader family of 1N47xx series Zener diodes manufactured by Microsemi (formerly Microchip Semiconductor). These devices are widely used for general-purpose voltage regulation. The 1N4746A G specifically denotes the 18V variant within this established lineup, offering consistent performance characteristics across different manufacturing batches.

Replacement Considerations

Equivalent parts include the 1N4746A from other manufacturers like onsemi or Taiwan Semiconductor. Surface-mount equivalents such as the MLL4746A are available for space-constrained designs. Verify pinout compatibility and thermal ratings when substituting.