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 V_DD=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
• 20-pin SOP package
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