1N2978B

Overview

The Microchip Technology 1N2978B is a silicon unidirectional Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 14 V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 10 W and operates within a temperature range of -65°C to 175°C. It utilizes a DO-213AA (DO-4) package with chassis stud mount configuration, where the case serves as the anode connection.

Feature Summary

• High power handling capability with 10 W maximum dissipation rating
• Extended thermal operation range supporting high-temperature environments up to 175°C
• Robust mechanical construction utilizing chassis stud mount for efficient heat transfer

Applications

• Voltage regulation in industrial power supplies
• Overvoltage protection circuits in harsh environments
• Reference voltage generation in military-grade electronic systems

Procurement Notes

Verify the specific manufacturer source, as this component is produced by multiple vendors including Microchip, NXP, and Central Semiconductor. Confirm that the received unit matches the required MIL-PRF-19500/124 qualification level if specified for your design. Ensure the package type corresponds to the DO-213AA standard for proper mounting compatibility.

Selection Notes

Select this component when a stable 14 V reference is required under high-power conditions. The wide operating temperature range makes it suitable for aerospace or automotive applications where extreme thermal cycling occurs. Consider the stud-mount requirement for thermal management infrastructure during PCB layout planning.

Part Context

This part belongs to the JEDEC registered 1N2970B through 1N3015B series of 10 W Zener diodes. These devices provide voltage regulation values between 3.9 V and 200 V. The series is available in commercial versions and qualified levels including JAN, JANTX, and JANTXV, offering flexibility for different reliability requirements.

Replacement Considerations

Compatible substitutes include the JANTX1N2978B from NXP and equivalent parts from Central Semiconductor Corp. Verify electrical parameters such as knee impedance and leakage current against the original datasheet to ensure circuit performance remains unaffected.