Quad OR gate in 14-TSSOP — timing and temperature grade
The MM74HCT32MTC is a quad 2-input OR gate from onsemi's 74HCT series, packaged in a 14-TSSOP (0.173", 4.40mm width) for surface-mount assembly. It operates across a 2V to 6V supply range, making it a direct drop-in for TTL-compatible 5V logic systems and 3.3V mixed-voltage buses. Maximum propagation delay is 20ns at 6V with a 50pF load — this sets the timing budget for the critical path. The -55°C to 125°C operating range covers industrial and military-grade environments — the same die can sit in an engine-bay ECU or a cold-chain data logger without a temperature-grade change.
Output drive and static power — what the numbers mean for the bus
Each output sinks or sources 5.2mA — enough to drive one or two standard TTL loads or a CMOS input with 10-15pF gate capacitance. For heavier fan-out (more than 4 loads), buffer the output with a line driver or use the 74HCT series' higher-drive siblings. Quiescent current is 2 µA max — the gate draws essentially nothing when idle. In battery-powered designs that cycle the supply rail, this keeps the sleep-mode drain below the leakage floor of most regulators. Input logic thresholds are TTL-compatible: 0.8V low, 2.0V high. This means the gate interprets a 0.8V signal as logic low and a 2.0V signal as logic high — it will correctly decode 3.3V CMOS outputs that swing 0-3.3V, but a 2.5V CMOS output with a 1.2V low may not meet the 0.8V low threshold if the driver's VOL is above 0.8V.
Active lifecycle — no obsolescence risk for this BOM line
onsemi lists the MM74HCT32MTC as Active — no NRND, EOL, or last-time-buy flags. The 74HCT series is a mature logic family with broad second-source availability (TI, Nexperia, Diodes Inc all produce pin-compatible parts), so single-source risk is low.