1 Mbit UV-erasable EPROM — 45 ns, military temp, ceramic DIP
The Cypress CY27H010-45WMB is a 1 Mbit UV-erasable EPROM organized as 128 K × 8 bits, accessed over a parallel interface with a 45 ns access time. It operates from a 4.5 V supply and is housed in a 32-lead ceramic DIP (32CDIP) for through-hole mounting. Rated for the full military temperature range of -55°C to 125°C, this part is built for avionics, missile guidance, satellite, and downhole instrumentation where commercial or industrial temperature parts cannot survive.
45 ns access time — bus timing fit
45 ns access time matches the spec table. Verify the memory controller's timing budget before committing the BOM line.
UV-erasable EPROM: no field updates possible
This is a UV-erasable EPROM, not an EEPROM or Flash. Firmware is programmed at the factory or in a development programmer using a UV eraser — there is no in-circuit reprogramming. Once the code is locked, every unit carries the same image. If your design requires field updates or bootloader flexibility, this is the wrong memory technology.
Ceramic 32CDIP — high-reliability package
The 32-lead ceramic DIP (32CDIP) provides a hermetic seal that protects the die from moisture and contaminants — essential for long-life missions in sealed or vacuum environments. Through-hole mounting offers mechanical robustness for high-shock and high-vibration installations typical of military and aerospace hardware.
Sourcing and lifecycle reality
Production status is flagged as end-of-life (EOL), and the part is sourced through independent distribution channels — not factory-direct. Availability and pricing are confirmed at quote time against an RFQ. For dual-sourcing or when the Cypress line is tight, the 5962-8961415QXA is a pin-compatible second source sharing the same 1 Mbit, 45 ns, 128 K × 8, parallel, 4.5 V, -55°C to 125°C, 32CDIP specifications.