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Product Detailed Parameters
- Description：IC SRAM 256KBIT PARALLEL 28SOJ
- Series：-
- Mfr：Alliance Memory, Inc.
- Package：Tape & Reel (TR)
- Memory Type：Volatile
- Memory Format：SRAM
- Technology：SRAM - Asynchronous
- Memory Size：256Kbit
- Memory Organization：32K x 8
- Memory Interface：Parallel
- Write Cycle Time - Word, Page：12ns
- Voltage - Supply：4.5V ~ 5.5V
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：28-BSOJ (0.300", 7.62mm Width)
- Supplier Device Package：28-SOJ
- Access Time：12 ns
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Overview
The AS7C256A-12JIN is a 256 Kbit (32K x 8) asynchronous static random-access memory manufactured by Alliance Memory. It operates within a voltage range of 4.5 V to 5.5 V and features a maximum access time of 12 ns. The device utilizes a parallel interface and is housed in a 28-pin Small Outline J-Lead (SOJ) package designed for surface-mount technology. It supports an industrial operating temperature range from -40°C to +85°C with a maximum supply current of 70 mA.
Feature Summary
- Asynchronous SRAM architecture providing fast random access capabilities
- Industrial-grade temperature rating for reliable operation in harsh environments
- Single 5V power supply compatibility for standard logic integration
Applications
- Industrial control systems requiring robust memory storage
- Embedded applications operating in extreme temperature conditions
- Data buffering in high-speed parallel processing circuits
Procurement Notes
Verify the suffix 'IN' confirms the SOJ-28 package and industrial temperature range. Confirm whether 'R' indicates tape-and-reel packaging or if it is a distributor-specific variant, as official datasheets typically list 'AS7C256A-12JIN'. Ensure the 5V supply requirement matches the target circuit design before procurement.
Selection Notes
Select this component when a 256 Kbit capacity is required with 12 ns speed in an industrial environment. Compare against the AS7C256A-15 series for lower cost options if slower speeds are acceptable. Consider the AS7C256A-10TIN for faster performance in TSOP packages if space constraints differ.
Part Context
This part belongs to the AS7C256A family of 256 Kbit CMOS SRAMs. It shares architectural similarities with other members like the AS7C256A-15TCN but differs in package type (SOJ vs TSOP) and operating temperature range (Industrial vs Commercial). The SOJ form factor offers specific mechanical advantages for certain board layouts compared to standard thin-shrink packages.
Replacement Considerations
AS7C256A-12JIN serves as a direct pin-compatible replacement for older 256Kx8 SRAMs in the same package. Verify that substitute parts maintain the 5V voltage specification and industrial temperature limits.
