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-TSSOP
Transceiver, Non-Inverting 2 Element 8 Bit per Element 3-State Output 48-TSSOP
1. 74FCT162245ATPAG Substitution Conclusion
From the perspective of core logic function, supply voltage, and pin configuration (functional compatibility), the 74FCT162245ATPAG can serve as a substitute for the original part. However, two critical technical differences prevent it from being a direct drop‑in replacement and require design verification. The differences are: First, the package dimensions differ. The original part uses the wider 48‑BSSOP (7.50mm), whereas the substitute is the narrower 48‑TFSOP (6.10mm). This results in incompatible PCB pad layouts, necessitating a board redesign. Second, the output drive capability differs. The original part provides 32mA (high) / 64mA (low) drive current, while the substitute offers a symmetric 24mA / 24mA. The substitute’s ability to drive heavy loads—especially on the low‑side—is significantly reduced, which may degrade signal integrity or fail to drive the loads connected in the original design. A reassessment of the system’s fan‑out and load characteristics is mandatory.
2. 74FCT162245CTPAG8 Substitution Conclusion
This device is identical to the 74FCT162245ATPAG in all key parameters provided; therefore, the substitution conclusion is the same: It is functionally compatible but cannot be directly replaced due to physical package size and output drive capability limitations. The key differences again lie in: the package change from 48‑BSSOP to the narrower 48‑TFSOP, making the PCB layout incompatible; and the reduction in drive current from an asymmetric 32mA/64mA to a symmetric 24mA/24mA. This weakens the driving strength, nearly halving the low‑side sink current capability in particular. If the original system design operates near the driving limits of the original device, the substitution risks system malfunction or reduced reliability.
Analysis ID: 4684-11E9000
Based on part parameters and for reference only. Not to be used for procurement or production.
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