MT8870 HT9170 DTMF Decoder IC DIP 18 Package

MT8870 HT9170 DTMF Decoder IC DIP 18 Package

The MT8870 and HT9170 are high-performance DTMF (Dual-Tone Multi-Frequency) decoder ICs designed to detect and decode telephone keypad tones into digital output codes. They are widely used in telecommunication, remote control, and automation systems where commands are sent over audio or telephone lines.

These ICs integrate band-split filters, digital decoder, and steering logic on a single chip, requiring only a few external components. When a valid DTMF tone pair is received, the IC outputs the corresponding 4-bit digital code along with a data valid (DV) signal, making it easy to interface with microcontrollers and digital logic.

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Applications

• Telephone-based remote control systems
• IVR and telecom equipment
• Wireless control and automation projects
• Security and access control systems
• Call routing and tone-controlled systems
• Paging and signaling equipment

Features

• Type: DTMF Decoder IC
• Compatible devices: MT8870 / HT9170
• Decodes all 16 standard DTMF tones
• On-chip band-split filters and digital decoder
• Provides 4-bit binary output of detected key
• Data Valid (DV) output indicates valid tone detection
• High immunity to speech and noise
• Crystal-controlled operation for high frequency accuracy
• Low power consumption
• Minimal external components required
• Package: DIP-18 (Through-hole)
• Easy interface with microcontrollers and logic circuits

MT8870-IC-DTMF-Decoder-IC Datasheet