Product Overview
Fujitsu 84256A-70L Static RAM - 32K x 8, 70ns, 5V, 28-Pin DIP, 62256-Compatible
Condition
Used, recovered from demanufactured equipment. Visually inspected and in good condition with nothing out of the ordinary noted. Guaranteed by our team. Evaluation: Visual inspection only. Function testing not performed. No accessories included.
Ships same business day from Idaho. Packed carefully.
Product Overview
Fujitsu 84256A-70L, 32,768 word x 8-bit CMOS static random access memory. Made in Japan. The -70L suffix designates a 70ns maximum access time with low-power standby characteristics. Organized as 32K x 8 (marketed as 256K-bit), it stores data without a refresh cycle and retains data as long as power or a minimum voltage is supplied. Housed in a standard 28-pin, 600-mil-wide plastic DIP package. Pin-compatible with the industry-standard 62256 series.
Key Features
- Organization: 32,768 words x 8 bits (32K x 8 / 256K-bit)
- Access time: 70ns maximum
- Supply voltage: 5V (+/- 10%)
- Package: 28-pin DIP, 600-mil wide (standard width)
- CMOS process: low-power standby operation
- No refresh required - static RAM
- Pin-compatible with 62256 and 43256 series
- Made in Japan
Applications
- System or buffer memory in 1980s and 1990s microcomputers (Apple II, Commodore, early x86 PCs)
- Classic arcade PCB repair (Neo Geo, Capcom, and similar boards)
- Industrial PLC peripheral modules requiring 5V SRAM
- Battery-backed RAM (save-game or settings retention with Dallas chip or coin cell)
- Maker and retro-computing projects: RC2014, Ben Eater 6502, and similar Z80 or 6502 builds
Frequently Asked Questions
Is this chip compatible with boards that call for a 62256?
Yes. The 84256A-70L is pin-compatible with the 62256 series and can substitute directly in sockets designed for that part number. The 70L variant can also safely replace slower -10L or -12L versions in most applications.
Will this fit a narrow (300-mil) DIP socket?
No. This is the standard 600-mil-wide DIP-28 package. It will not fit narrow or "skinny DIP" sockets. Confirm your board's socket width before installing.
Does this work in 3.3V systems?
No. This chip requires a regulated 5V supply. It is not compatible with 3.3V logic without level shifters.
What does the Fujitsu date code or logo look like?
Authentic Fujitsu chips carry the "F" logo and a date code on the package body. These markings are useful for verifying authenticity, which is a common concern in the retro and arcade repair communities.
The 84256A-70L is a well-understood part in the vintage computing and arcade repair communities. Verify your board's socket width and power supply before installation.
