The 1N4978US from Semtech Corporation is a 68 V ±5% Zener diode rated 5 W, for surface mounting.
The 1N4978US from Microchip Technology is a 68 V, 5 W Zener diode with ±5% tolerance, surface mount in a D-5B package.
The 1N4978US/TR from Microchip Technology is a voltage regulator zener diode.
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