The MMBD914 is a JEDEC standardized product manufactured by many suppliers. A question we receive sometimes is which supplier marks their diode which way and how to tell the difference between suppliers, often in the form of “which supplier does the 5D marking call out?”
The answer is both all of them and none of them. The ‘5D’ marking is part of the JEDEC standard for this product and does not have a manufacturer-specific meaning. Any given manufacturer’s MMBD914 is intended to be interchangeable with anybody else’s; if your MMBD914 has special “heightened” specifications only available from a single manufacturer, it’s not really a MMBD914 anymore and should not be using this part number or marking.