What this part is and where it fits
The Texas Instruments SN74HCS09QDRQ1 is a quad 2-input AND gate from the automotive-grade 74HCS series, combining Schmitt-trigger inputs with open-drain outputs. The open-drain output sinks 7.8 mA per channel. AEC-Q100 qualification is the primary sourcing gate for this part. The -40°C to 125°C operating range covers underhood and engine-bay environments.
Open-drain outputs and wired-AND configuration
The open-drain output stage lets multiple gate outputs connect to a common pull-up resistor, forming a wired-AND bus. Input logic levels scale with supply: a low threshold of 1V to 3V and a high threshold of 1.5V to 4.2V over the 2V to 6V supply range.
Lifecycle and sourcing posture
ROHS3 compliant. The Q1 suffix denotes the automotive-qualified variant with PPAP documentation available.
Timing and signal integrity
Maximum propagation delay is 11 ns at 6V supply with 50 pF load. Quiescent current is 2 µA maximum.
