HT12A/HT12E -- 212 Series of Encoders
 (HT12A EOL)

General Description

The 212 encoders are a series of CMOS LSIs for remote control system applications. They are capable of encoding information which consists of N address bits and 12-N data bits. Each address/data input can be set to one of the two logic states. The programmed addresses/data are transmitted together with the header bits via an RF or an infrared transmission medium upon receipt of a trigger signal. The capability to select a TE trigger on the HT12E or a DATA trigger on the HT12A further enhances the application flexibility of the 212 series of encoders. The HT12A additionally provides a 38kHz carrier for infrared systems.


  • Operating voltage
    - 2.4V~5V for the HT12A
    - 2.4V~12V for the HT12E
  • Low power and high noise immunity CMOS technology
  • Low standby current: 0.1uA (typ.) at VDD=5V
  • HT12A with a 38kHz carrier for infrared transmission medium
  • Minimum transmission word
    - Four words for the HT12E
    - One word for the HT12A
  • Built-in oscillator needs only 5% resistor
  • Data code has positive polarity
  • Minimal external components
  • Pair with Holtek's 212 series of decoders
  • 18-pin DIP, 20-pin SOP package

Technical Document


Other Information