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-TSSOP
Transceiver, Non-Inverting 2 Element 8 Bit per Element 3-State Output 48-SSOP
1. 74FCT162245ATPACT Substitution Conclusion
The 74FCT162245ATPACT is functionally equivalent to the original 74FCT16245CTPAG8 in terms of logic function, supply voltage range (4.5V–5.5V), and package (48-TFSOP, 6.10mm width). It is pin‑to‑pin compatible and can be mounted directly without footprint modification.
The key difference lies in the output drive current: the original device provides asymmetric drive (32 mA high, 64 mA low), whereas the substitute offers symmetric drive (24 mA both high and low). The substitution therefore results in significantly reduced drive capability, particularly for low‑level current, which drops from 64 mA to 24 mA. This reduction may introduce signal‑integrity risks in high‑load or high‑capacitance applications, such as increased voltage drop, extended rise/fall times, or reduced noise margin.
If the actual load current does not exceed 24 mA and timing requirements are not critical, the substitution is acceptable. Otherwise, the circuit’s drive capability should be re‑evaluated.
2. 74FCT162245ATPVCT Substitution Conclusion
The 74FCT162245ATPVCT matches the original 74FCT16245CTPAG8 in logic function and supply voltage (4.5V–5.5V), but presents two critical differences:
First, its output drive current is symmetric 24 mA (compared to the original asymmetric 32 mA/64 mA), reducing drive strength and potentially affecting signal integrity under heavy loads.
Second, the package is 48‑BSSOP (7.50mm width) versus the original 48‑TFSOP (6.10mm width). The differing package dimensions and pin pitch make the devices physically incompatible; they cannot be mounted on the same PCB pads.
While electrical substitution requires careful assessment of current demands, the physical mismatch makes direct replacement impossible. A PCB layout redesign and revised assembly process would be necessary.
Analysis ID: 82C3-03BE000
Based on part parameters and for reference only. Not to be used for procurement or production.
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