The ICL7135CPI+ is a 4.5-digit display driver from Analog Devices, in a 28-pin DIP package (0.600-inch body width). It operates from a single 4V to 6V supply and integrates the analog-to-digital conversion and multiplexed BCD output drive for a 4.5-digit display. The 4.5-digit resolution means it resolves a ±20,000-count full-scale input — the half-digit provides over-range indication, useful for panel meters that need to read slightly above the nominal maximum.
Housed in a 28-lead PDIP (0.600-inch row spacing), the ICL7135CPI+ is a through-hole part suited for prototyping, breadboard development, and production runs where wave-solder assembly is preferred over SMT reflow. The 0.600-inch DIP footprint is standard — the same pattern accepts the ICL7135 in ceramic DIP or plastic DIP variants, so a single PCB layout covers multiple sourcing options.
Temperature grade and environment
For extended temperature operation, the ICL7135CQI+ (PLCC package) or the industrial-grade ICL7135IPI+ (PDIP, -25°C to +85°C) are the next steps up the temperature ladder — pin compatibility varies by package.