KT3170 Low-Power DTMF Receiver IC – Samsung – 18-Pin DIP

The KT3170 is a dedicated Dual-Tone Multi-Frequency (DTMF) receiver IC engineered by Samsung for telecommunication systems, tone-based control, and remote-access applications. Built on low-power CMOS and switched-capacitor filter technology, this device accurately separates and validates input tone pairs and delivers a 4-bit digital output code to any microcontroller interface.

With support for all 16 standard DTMF tone combinations, on-chip differential amplifiers, internal clock circuitry, and tri-state output lines, the KT3170 minimizes external component count and simplifies digital signalling design. It operates from a single 5-volt supply, consuming only around 15mW, making it ideal for embedded and battery-powered communication hardware.

The KT3170 accepts a low-cost 3.58 MHz crystal and provides built-in power-down / input-inhibit features for system-level energy control. This IC is widely used in telecom switching, remote activation systems, answering units, paging terminals, automation controllers, and PABX solutions.

Available in a standard 18-pin DIP package, it integrates easily into prototyping boards and legacy telecommunication hardware.

⭐ Key Features (Benefits)

• Supports all 16 standard DTMF tones

• Low-power operation — approx. 15mW typical

• Single 5V supply for easy digital integration

• Built-in differential input amplifier

• Internal clock oscillator (3.58 MHz crystal ready)

• Latched three-state outputs for direct MCU interface

• 4-bit digital code output

• Reduced external component cost

• Includes input inhibit / power-down functionality

• Optimized for telecom-grade audio decoding

🛠️ Common Applications

• PABX & digital key-phone systems

• Telephone exchange equipment

• Remote-access and command control

• Paging and answering systems

• Credit-card authorization terminals

• Mobile radio communication

• Home automation and remote entry

• Data entry over audio tones
  

  Parameter	Value
  Decoding Standard	16-tone DTMF
  Output Format	4-bit digital
  Operating Supply	5V
  Power Consumption	~15 mW
  Clock Input	3.58 MHz crystal
  Interface	Tri-state MCU outputs
  Technology	CMOS + Switched-Capacitor Filters
  Package	18-Pin DIP
  Operating Temp	–25°C to +75°C
  Functions	Tone Decode, Filtering, Validation