Original Part
Transceiver, Non-Inverting 2 Element 8 Bit per Element 3-State Output 48-SSOP
Alternative Part
Transceiver, Non-Inverting 2 Element 8 Bit per Element 3-State Output 48-SSOP
Transceiver, Non-Inverting 2 Element 8 Bit per Element 3-State Output 48-TSSOP
1. 74FCT162245ATPVCT Substitution Conclusion
This part is a viable substitute, but attention must be paid to the difference in output drive strength. The substitute is fully compatible with the original part in terms of core logic function (non-inverting bidirectional transceiver), supply voltage, bit width, and package (48-BSSOP), allowing for a direct pin-to-pin drop-in replacement. The key difference lies in the output drive current: the original part features asymmetric drive (32mA source / 64mA sink), whereas the substitute offers symmetric drive (24mA / 24mA). Consequently, the substitute has slightly weaker sourcing capability (8mA lower) and significantly reduced sinking capability (40mA lower). This may impact its fan-out and signal integrity when driving heavy loads, such as multi-drop parallel buses, long traces, or high capacitive loads. However, it should function correctly in standard applications with lighter loads.
2. 74FCT162245CTPACT Substitution Conclusion
Substitution requires caution and a thorough evaluation of both output drive capability and package compatibility. While this part is compatible with the original in logic function, supply voltage, and bit width, it presents two critical deviations. First, its output drive current is also symmetric at 24mA/24mA, imposing the same drive strength limitations as noted above. Second, it uses a narrower 48-TSSOP package (width: 6.10mm) compared to the original 48-BSSOP package (width: 7.50mm). Therefore, not only must the drive capability be assessed against the load requirements, but the PCB layout must also be redesigned. Although the pin pitch is identical, the different package outline width and lead span prevent a direct physical solder replacement. It is essential to verify that the new package is suitable for the available board space and thermal management.
Analysis ID: 88D7-4476000
Based on part parameters and for reference only. Not to be used for procurement or production.
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