1N2984A

Overview

The 1N2984A is a silicon unidirectional Zener voltage regulator diode manufactured by Microchip Technology. It features a nominal Zener voltage of 20 V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 10 W at 25°C ambient temperature and has a maximum DC forward current of 125 mA. Key electrical parameters include a maximum Zener impedance of 4 Ohms and a leakage current of 5 µA at the rated voltage. The component utilizes a DO-213AA (DO-4) stud-mount package, designed for high-reliability applications requiring robust thermal management and hermetic sealing.

Feature Summary

• Hermetically sealed metal-glass construction for environmental protection
• Stud-mount configuration for efficient heat dissipation
• High power handling capability up to 10 watts
• Silicon junction technology for stable voltage regulation

Applications

• Voltage reference circuits in industrial equipment
• Overvoltage protection in aerospace systems
• Power supply regulation in military-grade electronics
• Surge suppression in critical infrastructure components

Procurement Notes

Verify that the specific order includes the correct suffix indicating the tolerance grade and packaging style. Confirm compliance requirements such as lead-free status or RoHS exemptions if applicable to the end-use environment. Ensure the supplier provides traceability documentation for hermetic seal integrity. Check for any specific handling instructions related to the stud-mount terminal during installation.

Selection Notes

Select this component when a precise 20 V reference is required in high-power environments. The DO-4 package allows direct mounting to chassis heatsinks, simplifying thermal design compared to surface-mount alternatives. Consider the 125 mA forward current limit when designing series resistor networks. Evaluate the 4 Ohm impedance against load regulation requirements for the specific application stability needs.

Part Context

This part belongs to the standard 1N298x series of high-power Zener diodes. These devices are commonly used in legacy and high-reliability designs where through-hole stud mounting is preferred. The series offers various voltage ratings while maintaining consistent mechanical and thermal characteristics across the product line.

Replacement Considerations

Direct substitutes include other manufacturers' equivalents in the DO-4 package with matching 20 V / 10 W specifications. Verify pinout compatibility, noting the anode is typically connected to the case. Ensure thermal resistance values are comparable to maintain safe operating temperatures under identical load conditions.