MT8870 DTMF Decoder IC with 4-Bit Output
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Prices updated: 12 Oct 2026
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About this product
MT8870 is a DTMF (touch-tone) decoder IC that converts the dual-tone signals from a telephone keypad into a 4-bit binary output. It is used in remote-control projects that receive commands over a landline or mobile phone call, with the output read directly by a microcontroller.
Specifications
- Function
- DTMF decoder
- Output
- 4-bit binary
- Clock
- 3.579545 MHz crystal (typical)
- Supply voltage
- 5 V (typical)
- Package
- 18-pin DIP
Frequently asked questions
What clock does it need?
The standard clock in the typical application circuit is a 3.579545 MHz crystal.
How can I tell when a valid tone has been decoded?
Use the StD (data valid) output, which goes high when a valid DTMF tone has been decoded, so the microcontroller can read the 4-bit output at the right time.
