1N2984B

Overview

The 1N2984B is a Zener diode manufactured by Microchip Technology, designed for voltage regulation applications. It features a 20V nominal Zener voltage with a tolerance of ±5%. The device is rated for a maximum power dissipation of 10W and operates with a test current of 125mA. It exhibits a dynamic impedance of 4 Ohms at the specified test conditions. The component utilizes a stud-mount configuration within the DO-213AA package, allowing for direct chassis attachment to facilitate thermal management. Internal construction includes solder bonds and hermetic sealing.

Feature Summary

• Hermetically sealed welded construction for environmental protection
• Stud-mount design enabling direct chassis thermal dissipation
• Internal solder bond construction for mechanical stability

Applications

• Voltage regulation in high-power circuits
• Chassis-mounted reference voltage sources
• Overvoltage protection systems requiring robust thermal handling

Procurement Notes

Verify the specific manufacturer source, as components labeled 1N2984B may originate from Microchip Technology or legacy entities like Microsemi. Confirm the package type matches the required mounting hardware, specifically the DO-213AA stud mount configuration. Ensure the voltage rating aligns with circuit requirements, noting that this specific part number corresponds to the 20V variant within the broader 1N2984 series which spans various voltages.

Selection Notes

Select this component when a fixed 20V regulation point is required with significant power handling capabilities. The stud-mount form factor is essential for applications where board space is limited but heat sinking via a chassis is feasible. Verify that the system can accommodate the physical dimensions and mounting hole specifications of the DO-213AA package. Consider the thermal resistance characteristics if operating near the 10W limit.

Part Context

The 1N2984B belongs to a family of high-power Zener diodes characterized by hermetic sealing and stud-mount packaging. This series typically covers a wide range of Zener voltages, from approximately 6.8V to 200V, all sharing similar mechanical and thermal profiles. The 'B' suffix often denotes a specific tolerance class, typically ±5%, distinguishing it from other variants in the same voltage category.

Replacement Considerations

Direct substitutes must match the 20V Zener voltage, 10W power rating, and DO-213AA stud-mount package. Verify compatibility with legacy Microsemi or New Jersey Semi-Conductor products if sourcing from alternative manufacturers. Ensure the replacement maintains the hermetic seal and internal solder bond construction for equivalent reliability.