1-of-8 decoder for automotive address and control decode
The Texas Instruments CAHCT138QPWRG4Q1 is a single 3-to-8 line decoder/demultiplexer from the Automotive 74AHCT logic family, AEC-Q100 qualified for use in vehicle-electronics subsystems. It accepts three binary select inputs and an active-low enable, producing one active-low output per input combination — the standard topology for memory-mapped peripheral select, chip-enable generation, and address decoding on a 5V bus. The 4.5V to 5.5V single-supply range matches legacy 5V TTL and CMOS logic rails, and the 8mA source/sink output drive is sufficient to switch a single LSTTL load or drive the enable pin of a downstream memory or register bank without a buffer.
AEC-Q100 qualification and 125°C junction rating
The AEC-Q100 qualification means the part has passed wafer-level reliability, parametric drift, and package-level stress tests per the Automotive Electronics Council standard — a requirement for any tier-1 production release.
16-TSSOP footprint and surface-mount assembly
Housed in a 16-TSSOP package (4.40mm body width, 0.65mm pitch), this decoder fits the compact PCB layouts typical of modern ECU and ADAS sensor modules.
This is a clean lifecycle position for both prototype builds and long-run production — no redesign pressure from an impending obsolescence event. ROHS3 compliant, with no restricted substances above the threshold limits. The suffix G4 indicates TI's green/RoHS package finish, so no additional exemption paperwork is needed for EU or China RoHS compliance statements.