Original Part
Alternative Part
SDRAM - DDR Memory IC 128Mbit Parallel 200 MHz 700 ps 66-TSOP II
SDRAM - DDR Memory IC 128Mbit Parallel 200 MHz 700 ps 66-TSOP II
1. AS4C8M16D1A-5TCNTR Substitution Conclusion
Based on key electrical specifications and physical packaging, the AS4C8M16D1A-5TCNTR is a highly compatible drop-in replacement for the original part. The primary differences are its higher clock frequency (200 MHz vs. 133 MHz) and slightly faster access time (700 ps vs. 750 ps). This device offers greater performance headroom in bus timing and typically enables downward compatibility. In a system originally designed for 133 MHz, this chip will operate stably under the same or more relaxed timing conditions. However, note that this part is specified in a "TSOP II" package, which may have subtle mechanical dimensional differences from the original "TSOP" package. It is recommended to verify PCB footprint compatibility prior to physical installation.
2. AS4C8M16D1A-5TINTR Substitution Conclusion
The AS4C8M16D1A-5TINTR shares identical core parameters with the AS4C8M16D1A-5TCNTR; therefore, the substitution conclusion is the same—highly feasible. Like the -5TCNTR, its differences from the original part are the higher clock frequency (200 MHz) and faster access time (700 ps). This similarly results in higher peak data bandwidth. When maintaining the original system voltage, organization, and interface, this chip offers a direct replacement with potential performance margin benefits. The sole distinction lies in the suffix ("TINTR" vs. "TCNTR"), which typically indicates different tape-and-reel packaging or minimum order quantities. This does not affect the chip's electrical characteristics or functionality but requires attention during procurement and SMT assembly to ensure the packaging format is compatible with production line equipment.
Analysis ID: A256-189A000
Based on part parameters and for reference only. Not to be used for procurement or production.
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