The differences between HT46R002/003 and HT48R002/003 are that the former two devices include an embedded 12-bit A/D converter and an 8-bit PWM. The multiple functions within these new devices extensively reduce the need for peripheral components, resulting in the added benefits of reduced PCB size and cost. Their precision internal system frequency oscillator further adds to these features making these new devices suitable for use in applications such as small household appliances.

Some of the special characteristics of the series can be seen in their OTP Program Memory capacity of 1Kx14 bits, SRAM Data Memory capacity of 64 bytes, industrial quality specification (-40~85℃), operating voltage range of 2.3V~5.5V, multi-function I/O pins, high speed 12-bit A/D converter, PWM function, internal RC oscillator, power-down and wake-up functions.

These new devices will see excellent use in the household appliance area such as hair care products, cooking appliances, electric fans, blenders, chargers etc. to name but a few. Presently, market attention is strongly focused on devices with excellent price/performance ratios, and in this respect these new Holtek devices conform well, giving them the capabilities to provide excellent MCU solutions to meet the needs of the modern household application area.

As is the case with other 8-bit Holtek MCUs, these new devices have high noise immunity as well as Watchdog and LVR protection features that give excellent immunity against malfunction or erroneous operation. The HT46R002 and HT48R002 devices are supplied in 8-pin DIP/SOP and 10-pin MSOP package types while the HT46R003 and HT48R003 devices are supplied in 16-pin DIP/NSOP package types.