The MT8870 is a device that can receive and decode DTMF signals. It has two parts: a filter section and a decoder section. The filter section uses a method called switched capacitor to separate the high and low frequency groups of the DTMF tones. The decoder section uses a method called digital counting to identify and convert all 16 DTMF combinations into a 4-bit code.
The MT8870 IC is a dedicated dual‐section DTMF receiver and decoder designed to detect touch‐tone dialling signals and convert them into digital output codes. Ideal for telecom interfaces and remote control systems, it processes both high and low frequency tone groups and delivers a 4‐bit binary representation for each of the 16 standard DTMF keys.
Key Features of MT8870 IC – DTMF Decoder IC
Complete on‐chip DTMF receiver and decoder for reliable tone detection
Low power consumption suitable for battery‐powered and portable designs
Built‐in gain setting amplifier with adjustable sensitivity
Configurable guard time for noise immunity and false‐tone rejection
Power‐down and inhibit modes to minimise current draw when idle
Backward compatible with MT8870C/MT8870C‐1 versions
Fast shipping from Zbotic across India
Applications and Use Cases
Telephone dial‐up interfaces for PBX and landline adaptors
Remote control systems using DTMF tone signalling
Security and alarm systems triggered via touch‐tone codes
Interactive voice response (IVR) and automated menu navigation
Home automation modules controlled over telephone lines
DTMF‐based data entry and telemetry systems
How to Use MT8870 IC – DTMF Decoder IC
To integrate the MT8870 IC, provide a regulated 5V–7V supply, route the audio input containing DTMF tones into the signal input pin, and configure the gain and guard time via external resistors. Once powered, the IC filters and decodes incoming tones, presenting a stable 4‐bit binary output on the data pins. Use the enable/inhibit pin to control decoding and the power‐down pin to reduce standby current.
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Easy Returns: Hassle-free replacement for defective products
Frequently Asked Questions
What supply voltage does the MT8870 IC require?
The MT8870 IC operates from a single 5V to 7V DC supply, with 5V being the typical recommended voltage for optimal performance.
How do I adjust the guard time on this decoder?
You can set the guard time by selecting the appropriate resistor value between the guard time pin and ground, allowing you to fine‐tune tone recognition and noise immunity.
Can I power down the MT8870 to save energy?
Yes. The IC features a dedicated power‐down mode pin; pulling it low disables internal circuits and reduces current consumption to microampere levels.
The MT8870 IC - DTMF Decoder IC is a versatile bluetooth, wifi and trans-receiver ics used across a wide range of applications including electronics projects, DIY builds, prototyping, and educational experiments.
Common use cases:
Integrating into a custom electronics project
Learning and experimenting with circuits
Replacing or upgrading components in existing setups
This product is ideal for electronics enthusiasts, engineers, and students.
Technical Tip: Always verify voltage and current requirements before connecting to your circuit. Check datasheets for detailed specifications and pin configurations.
Shipping & Delivery
Free shipping on orders above ₹999 across India
Dispatched within 1-3 business days
Expected delivery: 3-7 business days depending on location
Secure packaging to ensure safe transit of electronic components
15 Days Warranty
Please note that this item is only covered by a standard supplier warranty against manufacturing defects for a period of 15days from the time of delivery. It is important to understand that only manufacturing defects are covered under this warranty, and any other issues will not be considered for reimbursement or replacement. We strongly advise inspecting the product upon delivery to ensure it meets your expectations. In case of any manufacturing defects, we guarantee reimbursement or replacement.
What voids warranty:
If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.
Mahesh Garg (verified owner) –
This MT8870 IC – DTMF Decoder IC is amazing for home automation. Connected all my smart devices easily.
Aarav Reddy (verified owner) –
Good quality MT8870 IC – DTMF Decoder IC. Flash memory is sufficient for most projects.
Kunal Banerjee (verified owner) –
Perfect for my IoT project. This MT8870 IC – DTMF Decoder IC has excellent WiFi performance.
Dhruv Vohra –
This MT8870 IC – DTMF Decoder IC is amazing for home automation. Connected all my smart devices easily.
Deepak Dave –
Perfect for my IoT project. This MT8870 IC – DTMF Decoder IC has excellent WiFi performance.
Nikita Dhillon (verified owner) –
Good quality MT8870 IC – DTMF Decoder IC. Flash memory is sufficient for most projects.
Diya Arora (verified owner) –
Great quality MT8870 IC – DTMF Decoder IC. Flashed with ESPHome and it works beautifully.
Neeraj Pillai (verified owner) –
Outstanding MT8870 IC – DTMF Decoder IC! Programmed it with Arduino IDE. All features work as documented.
Pooja Rawat (verified owner) –
Decent MT8870 IC – DTMF Decoder IC. Had to install CP2102 drivers but works fine after that.
Sahil Arora (verified owner) –
Outstanding MT8870 IC – DTMF Decoder IC! Programmed it with Arduino IDE. All features work as documented.
Manish Mishra (verified owner) –
Great MT8870 IC – DTMF Decoder IC. OTA updates work perfectly. Using 5 of these around my house.
Vipin Gupta (verified owner) –
Nice MT8870 IC – DTMF Decoder IC for IoT prototyping. Breadboard compatible which is a plus.
Nitin Verma (verified owner) –
Decent MT8870 IC – DTMF Decoder IC. Had to install CP2102 drivers but works fine after that.
Pankaj Rathore (verified owner) –
Outstanding MT8870 IC – DTMF Decoder IC! Programmed it with Arduino IDE. All features work as documented.
Ravi Dave (verified owner) –
Excellent MT8870 IC – DTMF Decoder IC! WiFi connectivity is strong and stable. Perfect for IoT projects.
Atharv Joshi –
This MT8870 IC – DTMF Decoder IC is amazing for home automation. Connected all my smart devices easily.
Shivam Chauhan –
Decent MT8870 IC – DTMF Decoder IC. Had to install CP2102 drivers but works fine after that.
Vishal Mittal (verified owner) –
Nice MT8870 IC – DTMF Decoder IC for IoT prototyping. Breadboard compatible which is a plus.
Advik Panchal –
Love this MT8870 IC – DTMF Decoder IC. Built a smart switch with it. Works with Home Assistant perfectly.
Mayank Dave (verified owner) –
Average MT8870 IC – DTMF Decoder IC. WiFi drops occasionally but works for basic projects.
Dev Vohra (verified owner) –
Good MT8870 IC – DTMF Decoder IC. WiFi works well. Sometimes needs a reset but overall solid.
Girish Khanna (verified owner) –
Good quality MT8870 IC – DTMF Decoder IC. Flash memory is sufficient for most projects.