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. IS43R16800E-5TL-TR Substitution Conclusion
From a core specification standpoint, the IS43R16800E-5TL-TR is a viable substitute for the W9412G6KH-5 TR. Both devices are identical in memory density (128Mbit), organization (8M x 16), technology (DDR), clock frequency (200MHz), operating voltage (2.3V~2.7V), and package (66-TSOP II). This establishes the necessary physical and fundamental electrical conditions for a direct drop-in replacement.
The nominal differences lie in the "Memory Interface" description (Parallel vs. SSTL_2) and the "Access Time" parameter (700 ps vs. 50 ns). In practice, SSTL_2 is the standard parallel interface electrical specification for DDR memory; therefore, the "Parallel" designation in this context is functionally equivalent to SSTL_2 and does not represent a material discrepancy.
The significant numerical disparity in access time (700 picoseconds versus 50 nanoseconds) is highly indicative of a data entry error in the original part's specification or a reference to a different parameter. For a 200MHz DDR chip, 700ps is a reasonable value for tAC (Clock to Data Output Access Time), whereas 50ns is entirely inconsistent with DDR speed grades. Consequently, the 700ps value should be considered authoritative. This parameter indicates that the substitute device meets, and potentially exceeds, the signal output speed requirements of the original part.
In summary, this component demonstrates a high degree of substitution feasibility.
2. AS4C8M16D1A-5TCNTR Substitution Conclusion
The AS4C8M16D1A-5TCNTR is also a valid and effective substitute for the W9412G6KH-5 TR. Its key specifications—memory density, organization, technology, frequency, voltage range, and package—are a complete match with the original component, ensuring hardware compatibility.
Similar to the ISSI device, it shares the same two nominal discrepancies with the original part: the "Memory Interface" is listed as Parallel instead of SSTL_2, and the "Access Time" is specified as 700ps instead of 50ns. As previously noted, the interface terminology difference stems from common usage conventions, with both referring to the JEDEC-standard DDR SSTL_2 parallel interface. The large disparity in access time again strongly suggests that the 50ns value for the original part is erroneous. The 700ps figure is a typical performance parameter consistent with DDR-400 specifications, confirming that the substitute chip's response speed is within normal and acceptable limits.
This part is likewise feasible for direct substitution.
Analysis ID: 347F-4274000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com