The HT66F003 is an integrated circuit (IC) manufactured by Holtek and available in a 16-pin 150-mil SOP package. It is compliant with the RoHS standard, which specifies limits on the use of hazardous substances in electrical and electronic products.The HT66F003 is a low-voltage 8-bit microcontroller, designed for use in all types of applications requiring low-power consumption, such as remote control products, toys, and digital appliances. It features an 8051 instruction set, 8KB internal ROM, and 256 bytes RAM. It also includes a 12-bit analog-to-digital converter (ADC) with 10 channels, an 8-channel 10-bit pulse width modulation (PWM) engine, and two configurable serial ports. It can operate at a clock frequency up to 24 MHz.