Automotive 3:8 decoder/demultiplexer for the 2-6V bus
The Texas Instruments SN74HCS138QWBQBRQ1 is a single 3-line to 8-line decoder/demultiplexer in the 74HCS family, qualified to AEC-Q100 Grade 1 for automotive deployments. Operating from 2V to 6V with a -40°C to 125°C temperature range, it sinks or sources 7.8 mA per output — enough to drive the logic inputs of downstream ECUs or relay coils through a buffer stage. The 16-WFQFN exposed pad package (2.5x3.5 mm body) keeps the board footprint compact for space-constrained automotive control modules.
What AEC-Q100 Grade 1 means for the BOM
AEC-Q100 Grade 1 qualification certifies the device for -40°C to +125°C ambient — the full under-hood temperature band. An engine control unit or transmission module that sees 105°C on a summer grade still has margin to the 125°C ceiling. The single-supply 2-6V range spans the 3.3V and 5V automotive logic rails without a level translator — the same BOM position works across different ECU voltage domains.
Lifecycle and sourcing posture
Sourced through authorized distribution channels; availability and current pricing confirmed at RFQ against the BOM quantity.