1N2972B

Overview

The 1N2972B is a high-reliability Zener diode manufactured by Central Semiconductor, designed for robust voltage regulation in demanding environments. It features an 8.2V nominal Zener voltage with a 5% tolerance and a 10W power dissipation rating. The device utilizes silicon technology housed in a hermetically sealed DO-4 metal package (O-MUPM-D1). It operates within a temperature range of -65°C to +175°C and exhibits a maximum dynamic impedance of 1.5 Ω.

Feature Summary

• Hermetically sealed metal construction ensures environmental protection and long-term stability
• High thermal capacity supports 10W power dissipation for heavy-duty regulation tasks
• Military-grade reliability designation indicates suitability for critical applications

Applications

• High-reliability military and aerospace electronic systems
• Industrial equipment requiring stable voltage references under extreme temperatures
• Power supply circuits demanding robust overvoltage protection

Procurement Notes

Verify the specific manufacturer origin, as the part number appears associated with both Central Semiconductor and Microchip/Microsemi product lines depending on the qualification grade. Confirm that the required version meets the necessary MIL-PRF-19500 standards if military qualification is mandated. Ensure the DO-4 package configuration matches the mechanical constraints of the target assembly before finalizing procurement orders.

Selection Notes

Select this component when a high-power, ruggedized Zener diode is required for harsh operating conditions. The DO-4 metal package provides superior heat dissipation compared to glass or plastic alternatives. Consider the 1.5 Ω dynamic impedance for applications requiring tight voltage regulation under varying current loads. Verify compatibility with existing mounting hardware due to the stud-mount nature of the DO-4 case.

Part Context

This component belongs to a series of 10W Zener diodes registered with JEDEC, covering voltage ranges from approximately 3.9V to 200V. These devices are often qualified to JAN, JANTX, and JANTXV levels, indicating compliance with strict military performance standards. The series is characterized by internal solder bond construction for enhanced mechanical integrity.

Replacement Considerations

Direct substitutes include other 10W Zener diodes in the DO-4 package with matching 8.2V specifications. Cross-reference with Microsemi/Microchip equivalents such as the JANTX1N2972RB for verified military-grade sourcing. Ensure any replacement maintains the same hermetic sealing and thermal performance characteristics.