1N2988B

Overview

The 1N2988B is a 10 W Zener diode manufactured by Microchip Technology. It features a nominal Zener voltage of 27 V with a tolerance of ±5%. The device operates at a test current of 95 mA and exhibits a maximum dynamic impedance of 7 Ohms. It utilizes a DO-213AA (TO-5) stud-mount package, designed for chassis mounting applications requiring robust voltage regulation in power supply circuits.

Feature Summary

• Provides stable voltage regulation with a 10 W power dissipation rating
• Features a low dynamic impedance of 7 Ohms for precise voltage control
• Utilizes a rugged stud-mount package for secure chassis installation

Applications

• Electronic power supply voltage regulation
• Chassis-mounted reference voltage sources
• Overvoltage protection circuits

Procurement Notes

Verify the manufacturer designation as Microchip Technology or its predecessor entities such as Microsemi. Confirm the package type is DO-213AA (TO-5) and the voltage tolerance is ±5%. Ensure compliance with RoHS directives if required for the specific application environment. Cross-reference part numbers carefully to distinguish between similar variants like 1N2988A.

Selection Notes

Select this component when a high-power 27 V Zener diode is required for chassis-mounted applications. The 10 W rating supports significant current handling compared to smaller packages. The stud-mount design facilitates direct thermal coupling to heatsinks or chassis structures. Verify that the 7 Ohm dynamic impedance meets the circuit's stability requirements.

Part Context

This component belongs to the standard 1N2988 series of 10 W Zener diodes. These devices are commonly used in industrial and military-grade electronics where reliability under high power conditions is critical. The series offers various voltage options within the same mechanical footprint, allowing for flexible design integration across different power supply architectures.

Replacement Considerations

Check for equivalents from other manufacturers offering identical 10 W, 27 V, ±5% specifications in a TO-5 package. Ensure thermal resistance characteristics match the original design constraints. Verify pinout compatibility if the replacement uses a different lead configuration.