MT8870 IC DTMF Decoder Receiver IC DIP18
Review: 5 - "A masterpiece of literature" by John Doe, written onMay 4, 20020

MT8870 IC DTMF Decoder Receiver IC DIP18

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  • Product SKU: INTEG020
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The MT8870 is a DTMF (Dual-Tone Multi-Frequency) receiver integrated circuit.

Here are some key features and functions of the MT8870 IC:

DTMF Decoding: The primary function of the MT8870 is to decode DTMF signals, which are commonly used in telephone systems for dialing numbers.

Frequency Detection: It is capable of detecting the two frequencies that represent each key on a standard telephone keypad.

Digital Output: The IC provides a digital output corresponding to the decoded DTMF signal. This output is often in the form of a 4-bit binary code representing the pressed key.

Valid Output Signal: The MT8870 generates a valid output signal to indicate when a DTMF digit has been detected and is ready to be read.

Dial Tone Rejection: The IC is designed to reject continuous dial tones, focusing on recognizing valid DTMF signals.

External Components: It requires minimal external components for operation, making it relatively easy to integrate into various applications.

Interface with Microcontrollers: The output of the MT8870 can be easily interfaced with microcontrollers for further processing and control.

Power Supply: The IC typically operates on a dual power supply, commonly around ±5V.


Common applications include telephone keypads, remote control systems, automated systems, and any application where DTMF signaling is used.

Latch and Unlatch Function: Some versions of the MT8870 have a latch and unlatch function, allowing the IC to store the last decoded digit until a new digit is received.

Robust Design: The IC is designed to be stable and robust, capable of functioning reliably in different operating conditions.


  • Complete DTMF Receiver
  • Low power consumption
  • Internal gain setting amplifier
  • Adjustable guard time
  • Central office quality
  • Power-down mode
  • Inhibit mode
  • Backward compatible with MT8870C/MT8870C-1

Physical Attributes

  • Length * Width * Height (mm): 22 x 8 x 7
  • Weight (gm): 2


Package Includes

  • 1 x MT8870 IC - DTMF Decoder Receiver IC DIP-18

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