BUY KM41C4000CJ-7 https://www.utsource.net/itm/p/8928401.html

Description: 4Mbit (512K x 8-bit) CMOS Static RAM Features: - High speed access time: 70/90/120/150ns - Low power consumption: Active current max. 70mA (typ. 45mA) - Standby current max. 10μA (typ. 2μA) - Single power supply: 3.3V ± 0.3V - Fully static operation: No clock or refresh required - TTL compatible inputs and outputs - Easy memory expansion - Pin and function compatible with KM41C4000CJ-6 Application: - Automotive - Industrial - Medical - Networking - Telecommunications - Consumer Electronics - Military/Aerospace (For reference only)