What the TMS370C742ANT is and where it fits
The Texas Instruments TMS370C742ANT is an 8-bit microcontroller from the TMS370 family, built around the TMS370 core at 5 MHz. It carries 8 KB of OTP program memory, 256 x 8 RAM, and 256 x 8 EEPROM — enough for fixed-function control loops in motor drives, industrial timers, and appliance controllers where firmware is locked at the factory. On-chip peripherals include a PWM generator, watchdog timer, SCI serial interface, and an 8-channel 8-bit A/D converter. The 27 I/O lines route through a 40-pin PDIP package, rated for -40°C to 105°C operation on a 4.5 V to 5.5 V supply.
OTP memory — no field updates possible
Program memory is one-time programmable (OTP), meaning the firmware image is burned during production and cannot be changed afterward. This suits high-volume, fixed-function products where the code is mature and field updates are not required. For development or low-volume runs, plan for a separate UV-erasable windowed package or an emulator — the TMS370C742ANT itself is a production-only ordering code.
Through-hole PDIP — design-in constraints
The 40-pin PDIP (0.600" body width) is a through-hole package. It fits standard DIP sockets and wave-solder processes.
Temperature grade and environment
Rated for -40°C to 105°C, the TMS370C742ANT covers industrial and automotive under-hood temperature ranges. The 5 V supply rail (4.5 V to 5.5 V) is standard for legacy 5 V logic families and sensor interfaces. The SCI serial port runs at the core clock rate; no external oscillator is needed thanks to the internal oscillator.
Sourcing and lifecycle
The part is RoHS non-compliant, which may affect shipments to regions with RoHS restrictions — confirm your local compliance requirements before ordering.