Single 8-Input NAND in 74HCT — Where It Fits
The CD74HCT30M is a single 8-input NAND gate from the 74HCT series — HCMOS logic with TTL-compatible input thresholds. The 8-input topology is a niche combinatorial cell used in wide AND-OR-INVERT trees, address decoding, or parity-check networks where you need to collapse eight signals into one NAND function without cascading multiple 2- or 3-input gates. Input logic-low threshold is 0.8 V max, logic-high is 2 V min — these are the TTL levels that let the 74HCT family interface directly with 5 V TTL outputs without a level shifter. Quiescent current is 2 µA max, so the gate's own draw is negligible in a mixed-signal or battery-backed system. Output drive is 4 mA source and 4 mA sink at rated voltage — enough to drive one or two standard 74HCT loads but not a high-fanout bus. Propagation delay is 28 ns max at 4.5 V with a 50 pF load, which sets the ceiling for the data path timing budget.
14-SOIC Narrow-Body — Footprint and Reflow Fit
The CD74HCT30M comes in a 14-SOIC package with a 0.154-inch (3.90 mm) body width — the narrow SOIC-14 footprint, not the wider 0.300-inch SOIC-14W. Packaging is tube, not tape-and-reel — factor this into the pick-and-place feeder setup. If the line runs reel-fed only, request a reel option or plan for tube-to-reel transfer. The part is ROHS3 compliant, so no RoHS exemption expiry to track for the solder alloy. A high-MSL part that skips the bake risks popcorning in the 260 °C peak reflow.
Active Lifecycle — No Obsolescence Clock Ticking
ROHS3 compliance is current — no RoHS exemption expiry to manage. No stock-holding claim; the supply posture is per-RFQ.