Logic buffer with 3-state bus control
The 74HC241D,652 is a dual 4-bit non-inverting buffer with 3-state outputs from NXP's 74HC family — each element drives four bits, giving an 8-bit bus interface in one 20-pin SOIC package. The 3-state output allows multiple buffers to share a common data bus: when the output enable is deasserted, the pins go high-impedance and the bus floats, preventing contention between drivers. Supply voltage spans 2V to 6V, covering both 3.3V and 5V logic rails — the 74HC threshold is CMOS-compatible with TTL-level inputs across this range.
Temperature grade and environment
Rated for -40°C to 125°C ambient — this is the full industrial temperature band, so the buffer holds its logic thresholds and propagation delay across the thermal extremes of an outdoor telecom cabinet or an engine-bay ECU. The 20-SOIC wide-body package (7.50 mm body width) is a standard footprint for medium-density logic — it sits on the same land pattern as many 20-pin SOIC parts, simplifying PCB layout when swapping suppliers.
Output drive and fan-out
Each output sources or sinks 7.8 mA — enough to drive a handful of CMOS gate inputs or an LED indicator directly, but not enough for a relay coil or a long unterminated trace without a line driver. The non-inverting path means the output follows the input polarity — no logic inversion to account for in the truth table, which simplifies debug when probing bus activity.
Lifecycle and compliance
ROHS3 compliant — the part meets the EU RoHS exemption-free standard, clearing it for global shipping without additional compliance paperwork.