Automotive 3-to-8 decoder/demultiplexer in 16-SOIC
The SN74HCS137QDRQ1 from Texas Instruments is a single 3-to-8 line decoder/demultiplexer in the Automotive 74HCS logic family, housed in a 16-SOIC package. It takes a 3-bit binary address input and asserts one of eight active-low outputs, with an active-low enable and a latch enable input for registered operation. This part is qualified to AEC-Q100, making it suitable for automotive body electronics, transmission control, and any under-hood or cabin-domain system that needs to route a select signal to one of eight destinations over a 2 V to 6 V supply rail.
Supply range and output drive
Rated for a single supply from 2 V to 6 V, this decoder works directly with logic families within that range without external level translation. Each output can source or sink 7.8 mA.
Temperature grade and environment
The -40°C to 125°C operating range covers the full automotive temperature envelope, including hot under-hood and cold-start conditions. This same range also suits industrial outdoor equipment, motor drives, and telecom base stations where extended temperature is a requirement. The 16-SOIC body (3.90 mm width) is a standard footprint for surface-mount assembly, and the MSL rating (not in evidence but typical for this package) is MSL 1 — no bake needed before reflow if the bag seal is intact.
Lifecycle and sourcing reality
It is ROHS3 compliant, so no exemption expiry concerns for EU or global markets. The active lifecycle means it is safe to design in for new programs without near-term obsolescence risk.