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. 74FCT163245CPVG Substitution Conclusion
Direct substitution is not recommended. While this device matches the original in logic function (non-inverting transceiver), bit width, output type, and package outline (48-SSOP), there are critical differences in operating voltage and drive capability. This is a 3.3V LVTTL device with a supply voltage range of 2.7V to 3.6V, whereas the original is a 5V TTL device rated for 4.5V to 5.5V. These voltage levels are entirely incompatible; using the 3.3V part in a 5V system could lead to device failure or logic level errors. Furthermore, its high-level output current (8mA) is significantly lower than the original's (24mA). This asymmetry in drive strength, coupled with its weaker high-level drive capability, may result in unreliable operation when driving the same load.
2. 74FCT162245CTPAG Substitution Conclusion
Substitution is viable, provided the mechanical footprint requirements are met. This device is electrically identical to the original in all key parameters, including operating voltage range (4.5V to 5.5V), logic function, bit width, and symmetrical drive current (24mA sink/source). Both belong to the same voltage and logic level family, ensuring identical interface characteristics and drive capability. The primary difference is in the package profile: this part uses a narrower 48-TSSOP body (6.1mm wide) compared to the original 48-SSOP package (7.5mm wide). Before substitution, verify that the PCB layout has sufficient clearance for the narrower footprint and that mechanical installation is feasible. The pinout and functionality are fully pin-to-pin compatible.
Analysis ID: B781-3B64000
Based on part parameters and for reference only. Not to be used for procurement or production.
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