Triple 3-input NOR gate in 74LV — why the 2V–5.5V range matters
The Texas Instruments SN74LV27AD packs three independent 3-input NOR gates into a single 14-SOIC package, running from a 2V to 5.5V supply. That supply window means it works directly with 3.3V microcontrollers and legacy 5V logic without a level translator — a common gotcha when mixing voltage domains on the same board.
At 5V and 50 pF load the maximum propagation delay is 7.9 ns. That puts the SN74LV27AD in the same timing class as the 74LVC family, so it fits into existing 5V NOR-gate sockets without re-tuning the hold-time budget. At 3.3V the delay will be slightly longer — budget about 11 ns typical — still fine for SPI clock rates up to 20 MHz or address decode in a moderate-speed memory interface.
The quiescent current is a maximum 20 µA across the whole range, so it won't load the supply rail in battery-backed or always-on sections.
That means it is still in regular production, no last-time-buy notice, and no pressure to stockpile or find a replacement. The 74LV series is a mature low-voltage logic family with broad distribution support, so lead times tend to be short — confirm current availability at quote time.