Active 5V XOR gate for industrial temp BOMs
If your board sees engine-bay heat or cold-soak in a remote enclosure, the CD74HCT86MT keeps the XOR function within the timing budget.
32ns propagation delay at 4.5V — timing margin in the data path
The max propagation delay is 32 ns with a 4.5V supply driving a 50 pF load. For a 5V system clocked at 20 MHz (50 ns period), that delay consumes about 64% of the cycle — leaving 18 ns for the rest of the path. Budget this into your timing closure; at higher capacitive loads the delay stretches beyond the datasheet figure. Input logic thresholds are 0.8V low and 2V high — compatible with standard 5V TTL outputs. Outputs source and sink 4 mA each, enough to drive one or two 74HCT loads or a low-power LED indicator directly. Quiescent current maxes at 2 µA — negligible in the power budget for a 5V rail. The real draw is the switching current, which scales with frequency and load capacitance, but the static floor stays low.
14-SOIC footprint — board-fit and sourcing posture
The supplier device package is also 14-SOIC — no footprint ambiguity between the case code and the recommended pad layout.