The 9311DC is a single 1-of-16 decoder/demultiplexer in a 24-pin ceramic DIP (CDIP) package. It takes a 4-bit binary address input and asserts one of sixteen active-low outputs, making it the standard part for memory-chip select decoding, address demultiplexing, and data-routing in 5V TTL systems. The through-hole 24-CDIP (0.600" body width) is the hermetic, high-reliability version — suited for socketed boards in industrial controllers, test equipment, and legacy telecom racks where a plastic DIP would be a downgrade.
Supply and output drive — sizing the load
Runs on a single 5V rail (4.75V to 5.25V), so it drops straight into a 5V TTL or HCT logic bus without a separate regulator. For memory-select duty the fan-out to CMOS inputs is fine; for driving multiple LS-TTL loads, check the total low-level sink budget.
Temperature grade and storage reality
That covers office equipment, benchtop instruments, and indoor industrial cabinets, but not an engine bay or a rooftop enclosure. The CDIP package is ceramic, so moisture sensitivity is low; store the tubes in a dry cabinet if the room humidity cycles, but no bake is needed before reflow (through-hole anyway — wave solder or hand-solder).
RoHS non-compliant (the CDIP package uses lead-bearing solder dip or tin-lead finish), so if your BOM requires RoHS exemption for high-reliability or military use, this part fits; for full RoHS compliance, look at the surface-mount plastic equivalents.