HT12D IC

The HT12D is a popular decoder IC commonly used in remote control systems with RF (Radio Frequency) or IR (Infrared) communication. It's designed to work with its counterpart, the HT12E encoder IC, for wireless transmission applications.

Key Features:

• Part of the HT12 series by Holtek.
• Decodes 12-bit data: 8 address bits + 4 data bits.
• Compatible with HT12E encoder.
• Wide supply voltage range: 2.4V – 12V.
• Low power consumption.
• Valid Transmission (VT) pin indicates successful data reception.
• Built-in oscillator (requires external resistor).

Pin Configuration (18 Pins):

1–8 A0–A7 Address input pins

9 Ground Ground (0V)

10–13 AD0–AD3 Data output pins (decoded 4-bit data)

14 DIN Data input (from RF/IR receiver)

15 VT Valid Transmission indicator (HIGH when valid)

16 Osc2 Oscillator pin 2

17 Osc1 Oscillator pin 1 (connect resistor to Osc2)

18 Vcc Power supply

How It Works:

1. HT12E Encoder encodes 8 address + 4 data bits.
2. Transmits data via RF/IR transmitter module.
3. HT12D receives the encoded signal via DIN.
4. It compares the address bits with its own.
5. If the address matches, it activates the VT pin and outputs the data on AD0–AD3.

Applications:

• Wireless remote control systems.
• Home automation.
• RF-controlled robotic systems.
• Car/bike security systems.

Origin: China

Brand:- Holtek