1N3994RA

Single Zener Diodes Overview

The Microchip Technology 1N3994RA is a silicon unidirectional Zener diode designed for reverse voltage regulation. It features a nominal Zener voltage of 4.3 V with a tolerance of ±5%. The device supports a maximum power dissipation of 10 W and operates within a temperature range of -65 °C to +175 °C. Key electrical parameters include a dynamic impedance of 1.5 Ω, a maximum reverse leakage current of 10 µA, and a test current of 580 mA. It utilizes a DO-203AA (DO-4) stud-mount package.

Single Zener Diodes Feature Summary

• High thermal stability enabling operation up to +175 °C
• Robust 10 W power dissipation capability for high-current regulation
• Stud-mount construction for efficient heat sinking

Single Zener Diodes Applications

• Reverse voltage regulation in industrial power systems
• Overvoltage protection circuits requiring high thermal endurance
• Voltage reference applications in harsh environments

Single Zener Diodes Procurement Notes

Verify RoHS compliance status as sources indicate non-compliance. Confirm the specific manufacturer lot and datasheet revision upon ordering. Ensure the procurement channel provides authentic Microchip Technology components to guarantee performance specifications and reliability standards are met for critical applications.

Single Zener Diodes Selection Notes

Select this component when a 4.3 V regulation point is required with significant power handling. The DO-4 stud-mount package necessitates appropriate mounting hardware and thermal interface materials. Consider the 1.5 Ω dynamic impedance for load regulation requirements and ensure the operating environment stays within the specified -65 °C to +175 °C range.

Single Zener Diodes Part Context

This part belongs to the 1N399x series of high-power Zener diodes manufactured by Microchip Technology. These devices are engineered for rugged applications where standard surface-mount packages cannot dissipate sufficient heat. The RA suffix typically denotes specific manufacturing or packaging variations within the Microchip portfolio, distinct from generic equivalents.

Single Zener Diodes Replacement Considerations

The 1N3994A is a comparable variant offering identical 4.3 V, 10 W, and DO-4 specifications. Verify pinout compatibility and thermal resistance characteristics before substitution. Ensure the replacement part meets the same environmental and electrical tolerances required by the original design.