MT8870 DTMF Voice Decoding Module for Arduino & Phone Systems

MT8870 DTMF Voice Decoding Module – Reliable Tone Decoding for DIY Electronics

The MT8870 DTMF Voice Decoding Module is a compact, high-performance electronic module designed to decode Dual-Tone Multi-Frequency (DTMF) signals from phone lines, audio sources, and microcontrollers. Whether you're building a remote control system, automating telephone-based triggers, or integrating tone decoding into your Arduino or STM32 project, this module delivers accurate and stable signal decoding in a tiny footprint.

Ideal for hobbyists, engineers, and electronics developers, this module is available in single-unit, 5-piece, and 10-piece packs — making it a cost-effective solution for prototyping and wholesale orders alike.

Key Features

• MT8870 Chip: Industry-standard DTMF decoder IC for accurate tone recognition
• Compact Size: 26.5mm × 24.5mm — fits easily into tight enclosures and PCB layouts
• Low Power Consumption: Maximum working current of only 10mA — energy efficient for battery-powered designs
• Wide Operating Temperature: Rated from -65°C to +150°C for robust performance across environments
• 5V DC Supply: Compatible with standard Arduino, STM32, Raspberry Pi, and other microcontroller power rails
• DIY Kit Packaging: Ready to integrate into your own custom project builds
• Dissipation Power: 500mW — stable and efficient under continuous operation
• Available in Quantities: 1 piece, 5 pieces, or 10 pieces — perfect for individual projects or bulk builds

Technical Specifications

Common Applications

• Telephone tone-controlled relay and switching systems
• Arduino / STM32 DTMF remote control projects
• Industrial telephone automation
• Security and access control systems using phone keypads
• Audio tone recognition and signal processing experiments

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Frequently Asked Questions

Q: What does the MT8870 DTMF Voice Decoding Module do?

A: The MT8870 DTMF Voice Decoding Module detects and decodes Dual-Tone Multi-Frequency (DTMF) audio signals — the tones generated by telephone keypads. It outputs the decoded digit as a 4-bit binary signal, which can be read by a microcontroller (such as Arduino or STM32) to trigger actions, control relays, or process telephone commands.

Q: Is this module compatible with Arduino and STM32 microcontrollers?

A: Yes! The MT8870 module operates on a standard 5V DC supply, making it fully compatible with Arduino, STM32, and most other 5V microcontroller platforms. Simply connect the power and signal lines to your board and start decoding DTMF tones in your project.

Q: How many pieces do I need and what quantity options are available?

A: This module is available in 1-piece, 5-piece, and 10-piece options, so you can order exactly what you need — whether for a single prototype or a bulk production run. The low per-unit price on multi-packs makes it an excellent value for engineers and hobbyists building multiple units.

Q: What is the operating temperature range of this module?

A: The MT8870 DTMF Decoding Module is rated for an operating temperature range of -65°C to +150°C, making it suitable for use in a wide variety of environments, including industrial and outdoor enclosures.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.