1N4978US/TR

Single Zener Diodes Overview

The Microchip Technology 1N4978US/TR is a Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 68 V with a tolerance of ±5%. The device has a maximum power dissipation of 5 W and operates within a temperature range of -65°C to +175°C. Key electrical parameters include a reverse leakage current of 2 µA at 51.7 V, a forward voltage of 1.5 V at 1 A, and a maximum Zener impedance of 50 Ohms. It utilizes a square surface-mount package.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation with a nominal 68 V output.
• Capable of handling high power dissipation up to 5 W.
• Engineered for operation in extreme environments from -65°C to +175°C.
• Utilizes a compact square surface-mount form factor.

Single Zener Diodes Applications

• Voltage reference circuits
• Overvoltage protection systems
• Power supply regulation

Single Zener Diodes Procurement Notes

Verify the specific suffix US/TR against official Microchip documentation to confirm the exact package type and tape-and-reel configuration. Ensure compliance with MIL-PRF-19500 standards if military-grade qualification is required. Confirm RoHS status and environmental declarations prior to integration.

Single Zener Diodes Selection Notes

Select this component when a 68 V regulation point is needed with high thermal stability. The 5 W power rating supports significant current handling. Verify that the square SMT footprint fits the PCB layout constraints. Compare against axial equivalents if through-hole mounting is preferred.

Single Zener Diodes Part Context

This part belongs to the 1N4978 series of Zener diodes manufactured by Microchip Technology. It serves as a surface-mount variant of traditional axial components, offering similar electrical characteristics in a modern package suitable for automated assembly processes.

Single Zener Diodes Replacement Considerations

Direct substitutes include JAN1N4978, JANTXV1N4978, and 1N4977 (with voltage adjustment). Verify pinout compatibility and package dimensions before substitution.

Single Zener Diodes FAQ

What is the maximum operating temperature?

The maximum operating temperature is +175°C.

What is the Zener impedance?

The maximum Zener impedance is 50 Ohms.