90 ns parallel NOR flash for legacy 8-bit buses
The Micron MT28F010-90 is a 1 Mbit parallel NOR flash organized as 128K x 8, with a 90 ns access time, in a 32-PLCC surface-mount package. It operates from a 4.5 V supply and is rated over the -40°C to 125°C temperature range (TC). This is a non-volatile memory intended for firmware storage on parallel buses — common in industrial controllers, avionics black-box recorders, and telecom line cards where the CPU expects a byte-wide memory interface.
Lifecycle and sourcing reality
The lifecycle record shows conflicting signals: one entry marks the part as end-of-life (hot), while another lists it as Active. This is typical for a mature NOR flash that has moved to limited-run or last-time-buy status at the factory but remains available through independent distribution. The MT28F010-90 is not an officially discontinued line with a published end date — but expect allocation pressure and no guarantee of future factory replenishment. We source this part to order against an RFQ through our independent channel; availability and current pricing are confirmed at quote time. No official successor order code is listed; if you need a drop-in replacement, the MT28F010-12/B shares the same footprint, supply, and organization with a 120 ns access time and wider -55°C to 125°C temperature range.
Date-code and provenance check
Given the lifecycle ambiguity, verifying the date-code and marking consistency is important. The 32-PLCC package should carry a clean laser-etched Micron logo and the MT28F010-90 part number with a date-code that matches the manufacturer's plant format for that week. Re-marked or sanded tops are a red flag — the PLCC body is small, and a relabeled part often shows uneven laser contrast or a missing index dot. We can provide decap X-ray or marking inspection reports on request to confirm the die matches the Micron NOR flash layout.