1N2999RB

Overview

The 1N2999RB is a single Zener diode manufactured by Microchip Technology, designed for surge-protected power management in industrial applications. It features a nominal Zener voltage of 56 V with a tolerance of ±5%. The device supports a maximum power dissipation of 10 W and operates within a junction temperature range of -65°C to +175°C. Key electrical characteristics include a reverse leakage current of 5 µA at 42.6 V and an impedance of 16 Ohms. It utilizes a DO-213AA (DO-4) stud-mount package with cathode case connection.

Feature Summary

• Surge-protected power management solution for industrial use
• High thermal stability with extended operating junction temperature range
• Stud-mount construction for robust chassis installation

Applications

• Industrial power supply protection
• Voltage regulation in high-power circuits
• Surge suppression systems

Procurement Notes

Verify the manufacturer origin, as historical data indicates production by Microsemi Corporation before its acquisition by Microchip Technology. Confirm the specific datasheet version matches the required electrical tolerances and thermal specifications. Ensure the DO-213AA package dimensions align with the intended chassis mounting hardware. Check for RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a 56 V regulation point is required with significant power handling capabilities. The stud-mount package facilitates direct heat sinking to a chassis, making it suitable for environments where board space is limited but thermal dissipation is critical. Compare the 10 W power rating against the expected peak surge currents to ensure adequate safety margins during transient events.

Part Context

This part belongs to the family of high-power Zener diodes typically used in discrete voltage reference and clamping applications. The 1N2999RB specifically addresses scenarios requiring higher wattage than standard surface-mount devices can provide. Its legacy designation links it to earlier Microsemi product lines, now integrated into Microchip's broader diode portfolio for industrial and automotive sectors.

Replacement Considerations

Direct substitutes may include other 56 V, 10 W Zener diodes in DO-213AA packages from compatible manufacturers. Verify pinout compatibility, specifically the cathode case connection, to ensure correct circuit integration without rewiring.