Original Part
Transceiver, Non-Inverting 2 Element 8 Bit per Element 3-State Output 48-TSSOP
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-SSOP
1. 74ABT16245BDL,112 Substitution Conclusion
The devices are functionally and pin-compatible, but attention must be paid to the package difference. Direct substitution is feasible provided the PCB design allows for it. The core logic function (non-inverting 2x8-bit tri-state transceiver), supply voltage range (4.5V to 5.5V), and key drive capabilities (output currents of 32mA and 64mA) are identical, ensuring equivalent electrical performance and logical behavior. The primary distinction lies in the package footprint: the original part is a narrower 48-TSSOP (6.10mm body width), while the substitute is a wider 48-SSOP (7.50mm body width). Their physical dimensions and pin pitch differ, despite sharing identical pinout and functionality. If the original PCB layout is designed for the TSSOP package, this SSOP substitute cannot be directly soldered; the PCB pad pattern must be modified. Direct replacement is possible only if the board can accommodate or has already allocated space for the larger SSOP package.
2. 74ABTH162245ADL,11 Substitution Conclusion
The devices are broadly compatible in function and pinout, but a significant difference in a key drive parameter makes direct substitution inadvisable without evaluating the load conditions. This part is similar to the original in logic function, supply voltage, and package outline (48-SSOP). However, there is a critical electrical discrepancy: its low-level output current (I_OL) is only 12mA, substantially lower than the original's 64mA. This represents a major reduction in its sink current (pull-down) drive strength. When driving heavy loads (e.g., low impedance inputs or multiple parallel inputs), this can cause the output low-level voltage (V_OL) to rise beyond its specified maximum, potentially leading to signal level errors, degraded noise margin, and system instability. Unless it is confirmed that the actual load current in the application is well below 12mA, this part is not suitable as a direct substitute.
Analysis ID: AB6B-E84F000
Based on part parameters and for reference only. Not to be used for procurement or production.
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