AS7C256A-12JCNTR

Overview

The AS7C256A-12JCNTR is a 256 Kbit (32K x 8) asynchronous static random-access memory (SRAM) manufactured by Alliance Memory, Inc. It operates within a supply 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 a maximum power supply current of 70 mA and functions reliably across an industrial temperature range from -40°C to +85°C.

Feature Summary

• Asynchronous parallel SRAM architecture providing fast data access without external clock synchronization
• Industrial-grade thermal stability ensuring reliable operation across extended temperature ranges
• Single 5V power supply compatibility simplifying integration into standard logic systems

Applications

• Industrial control systems requiring robust memory under varying environmental conditions
• Embedded applications utilizing 5V logic families for data buffering
• Automotive electronics operating within specified industrial temperature limits

Procurement Notes

Verify the specific suffix 'JCNTR' confirms the SOJ-28 package and tape-and-reel packaging format. Ensure the design accommodates the 4.5V to 5.5V supply requirement. Confirm moisture sensitivity handling procedures are followed during assembly due to surface-mount construction. Cross-reference the manufacturer datasheet for pinout accuracy and electrical characteristics before finalizing procurement specifications.

Selection Notes

Select this component when a 256 Kbit capacity with 12 ns speed is required in a 28-pin SOJ form factor. It is suitable for designs needing industrial temperature performance (-40°C to +85°C). Consider alternatives if commercial temperature range suffices or if a TSOP package is preferred for board space constraints. Verify power consumption limits against system capabilities given the 70 mA maximum current draw.

Part Context

This part belongs to the AS7C256A family of high-speed CMOS static RAMs. The 'J' indicates the SOJ package style, while 'NTR' typically denotes the tape-and-reel packaging variant. This series offers non-volatile-like ease of use with volatile speed, serving as a direct replacement for older EPROM or EEPROM solutions in many microcontroller-based systems.

Replacement Considerations

Check for AS7C256A-12JCN for tube packaging or AS7C256A-12TCN for TSOP packages if form factor changes are acceptable. Verify pin-to-pin compatibility with other 256Kx8 SRAMs from different manufacturers before substitution.