What this part is and where it fits
The 8753H/BQA is an 8-bit microcontroller built around the 8051 CPU core, clocked at 12 MHz. Program memory is UVPROM — one-time factory-programmed, not field-reprogrammable — so the firmware must be finalized before ordering. With 32 I/O lines and a UART/USART serial interface, it suits embedded control tasks in harsh environments: the operating temperature range spans -55°C to 125°C (TC), qualifying it for avionics, missile guidance, satellite systems, and downhole instrumentation where commercial-grade parts cannot survive.
12 MHz clock and UVPROM — design constraints
The 12 MHz clock drives the 8051 CPU core. UVPROM memory prevents field firmware updates.
Temperature grade and environment
Rated for -55°C to 125°C (TC). Through-hole package (Bulk) suits hand-soldering and socketed boards.