{"product_id":"mt8870ds-mt8870-sop18-dtmf-tone-decoder-ic-5pcs","title":"MT8870DS \/ MT8870 SOP-18 DTMF Tone Decoder IC (5pcs)","description":"\u003ch2\u003eMT8870DS \/ MT8870 — SOP-18 DTMF Tone Decoder IC\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eMT8870DS\u003c\/strong\u003e is a complete \u003cstrong\u003eDTMF (Dual-Tone Multi-Frequency) receiver IC\u003c\/strong\u003e in SOP-18 SMD package. It decodes all \u003cstrong\u003e16 standard DTMF tones\u003c\/strong\u003e (0–9, A–D, *, #) and outputs a \u003cstrong\u003e4-bit binary code\u003c\/strong\u003e plus a strobe signal — making it ideal for telephone remote control, tone-based command systems, and audio frequency detection. This listing provides \u003cstrong\u003e5 pieces\u003c\/strong\u003e — new and original.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Numbers\u003c\/td\u003e\n\u003ctd\u003eMT8870DS \/ MT8870D \/ MT8870\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eSOP-18 (SMD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDTMF Tones Decoded\u003c\/td\u003e\n\u003ctd\u003eAll 16 (0–9, A–D, *, #)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput\u003c\/td\u003e\n\u003ctd\u003e4-bit binary (Q1–Q4) + StD strobe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrystal Frequency\u003c\/td\u003e\n\u003ctd\u003e3.579545MHz (standard NTSC crystal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage (Vdd)\u003c\/td\u003e\n\u003ctd\u003e2.5V – 5.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Sensitivity\u003c\/td\u003e\n\u003ctd\u003e-25dBm (typ.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuard Time\u003c\/td\u003e\n\u003ctd\u003e40ms (min. tone duration)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-40°C to +85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003e5 PCS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch3\u003eDTMF Output Code Table\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eKey\u003c\/th\u003e\n\u003cth\u003eQ4\u003c\/th\u003e\n\u003cth\u003eQ3\u003c\/th\u003e\n\u003cth\u003eQ2\u003c\/th\u003e\n\u003cth\u003eQ1\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e*\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e#\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eA–D\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e0–1\u003c\/td\u003e\n\u003ctd\u003e0–1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch3\u003eWhy Choose MT8870DS?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003eComplete DTMF receiver\u003c\/strong\u003e — bandpass filter, decoder, and latch in one IC\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003e4-bit parallel output\u003c\/strong\u003e — directly readable by Arduino\/ESP32 GPIO or 74HC595\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eStD strobe output\u003c\/strong\u003e — interrupt-driven reading, no polling needed\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eStandard 3.58MHz crystal\u003c\/strong\u003e — uses common NTSC TV crystal, easy to source\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003e2.5–5.5V operation\u003c\/strong\u003e — compatible with 3.3V and 5V systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eCompatible With \/ Works With\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eArduino UNO\/Nano (read Q1–Q4 on digital pins, StD as interrupt)\u003c\/li\u003e\n\u003cli\u003eESP32 \/ ESP8266 (3.3V compatible, read via GPIO)\u003c\/li\u003e\n\u003cli\u003eTelephone line interface circuits (600Ω transformer coupling)\u003c\/li\u003e\n\u003cli\u003e3.579545MHz crystal (standard NTSC, widely available)\u003c\/li\u003e\n\u003cli\u003eMT8880 (DTMF transceiver, transmit + receive)\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelephone Remote Control\u003c\/strong\u003e — control Arduino relay via DTMF tones from any phone\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDTMF Decoder Module\u003c\/strong\u003e — decode keypad tones for access control systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTone-Based Command System\u003c\/strong\u003e — audio frequency command decoder for radio remote control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaller ID \/ IVR System\u003c\/strong\u003e — detect DTMF digits in telephone IVR applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecurity System\u003c\/strong\u003e — DTMF-based alarm arm\/disarm via telephone\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: What crystal does MT8870DS need?\u003c\/strong\u003e\u003cbr\u003eA: A standard \u003cstrong\u003e3.579545MHz\u003c\/strong\u003e crystal (NTSC color burst frequency). This is the same crystal used in old NTSC TV sets and is widely available. Connect between pins OSC1 and OSC2 with 22pF load capacitors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: How do I connect MT8870DS to Arduino?\u003c\/strong\u003e\u003cbr\u003eA: Connect Q1–Q4 to Arduino digital pins (D2–D5), StD to an interrupt pin (D2 or D3). When StD goes HIGH, read Q1–Q4 to get the 4-bit DTMF code. Use \u003ccode\u003eattachInterrupt()\u003c\/code\u003e for reliable detection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Can MT8870DS decode tones from a smartphone?\u003c\/strong\u003e\u003cbr\u003eA: Yes. Play DTMF tones through a speaker near the MT8870DS input, or connect via audio jack. The IC's input sensitivity (-25dBm) is sufficient for audio-level signals from smartphones.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e5× MT8870DS \/ MT8870 SOP-18 DTMF Tone Decoder IC\u003c\/li\u003e\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46991482323179,"sku":"\u003cnone\u003e","price":14.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/mt8870ds-sop18-dtmf-ic.webp?v=1761545254","url":"https:\/\/keszoox.com\/products\/mt8870ds-mt8870-sop18-dtmf-tone-decoder-ic-5pcs","provider":"Keszoox","version":"1.0","type":"link"}