# 8 Channel I2C Electromagnetic Relay Module Opto 8 Channel I2C Electromagnetic Relay Module Opto Isolated PCF8574 3.3V 5.0V - **Seller:** [Olegs Bugrovs's store](https://lectronz.com/stores/krida_electronics), Riga, Latvia - **Price:** €18.48 (EUR, before shipping and taxes) - **Availability:** In stock - **HS code:** 854200 - **Product page:** https://lectronz.com/products/-8-channel-i2c-electromagnetic-relay-module-opto ## Images ![8 Channel I2C Electromagnetic Relay Module Opto](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzEwMTAsInB1ciI6ImJsb2JfaWQifX0=--69ec336aeb3088c3a35c864f4e4effd78bd7734d/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-05-27T15-3A16-3A56.113Z-02.jpg) ![8 Channel I2C Electromagnetic Relay Module Opto](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzEwMTEsInB1ciI6ImJsb2JfaWQifX0=--f8fd845fabe7d88a3769863d52e67a1084932db2/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-05-27T15-3A16-3A56.113Z-01.jpg) ![8 Channel I2C Electromagnetic Relay Module Opto](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzEwMTIsInB1ciI6ImJsb2JfaWQifX0=--f88b5ccc55025421aa97e6b7e82e1aca303bb687/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-05-27T15-3A16-3A56.113Z-04.jpg) ![8 Channel I2C Electromagnetic Relay Module Opto](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzEwMTMsInB1ciI6ImJsb2JfaWQifX0=--c560162cb7ca512b806227e3544ef15faaec7c82/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-05-27T15-3A16-3A56.113Z-05.jpg) ![8 Channel I2C Electromagnetic Relay Module Opto](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzEwMTQsInB1ciI6ImJsb2JfaWQifX0=--c3674ef90747fd45a01076e724e59a942bc9df9a/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-05-27T15-3A16-3A56.113Z-08.jpg) ![8 Channel I2C Electromagnetic Relay Module Opto](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzEwMTUsInB1ciI6ImJsb2JfaWQifX0=--5985922da8f4b9a9af896203ec1def1b56a414a2/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-05-27T15-3A16-3A56.113Z-07.jpg) ![8 Channel I2C Electromagnetic Relay Module Opto](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzEwMTYsInB1ciI6ImJsb2JfaWQifX0=--6374fffa114ac2eee94dd0c05d929b8bb4f2eff4/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-05-27T15-3A16-3A56.113Z-09.jpg) ![8 Channel I2C Electromagnetic Relay Module Opto](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzEwMTcsInB1ciI6ImJsb2JfaWQifX0=--d2965356ffb672e44f734e269b68c6e66021c152/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-05-27T15-3A16-3A56.113Z-11.jpg) ![8 Channel I2C Electromagnetic Relay Module Opto](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzEwMTgsInB1ciI6ImJsb2JfaWQifX0=--d3cc7714c61a5ed37c06c1fb9e3347f844648862/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-05-27T15-3A16-3A56.113Z-12.jpg) ![8 Channel I2C Electromagnetic Relay Module Opto](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzEwMTksInB1ciI6ImJsb2JfaWQifX0=--62ae1f033fa4abcf64bda5c9847cc589892ab5d3/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-05-27T15-3A16-3A56.113Z-13.jpg) ![8 Channel I2C Electromagnetic Relay Module Opto](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzEwMjAsInB1ciI6ImJsb2JfaWQifX0=--cfea5ce6049c854892a81c14e5d7cc3fe69543d6/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-05-27T15-3A16-3A56.113Z-15.jpg) ![8 Channel I2C Electromagnetic Relay Module Opto](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzEwMjEsInB1ciI6ImJsb2JfaWQifX0=--b66549e08647e651a1e414ace53f0fd1032a73d5/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-05-27T15-3A16-3A56.113Z-14.jpg) ## Description **8 Channel Opto Isolated Electromagnetic Relay Module with I2C Interface, PCF8574** - compatible with Home Assistant / ESPHome - DUAL Power support - 3.3V for logic side and 5.0V for relays --- **Product description:** - PCB board dimension 72mm x 150mm - Compatible with DIN rail plastic holder - Operation DC voltage – 3.3V and 5.0V - Maximum current @5.0V – 700mA - Maximum current per relay – 10A peak - LEDs indicators for each electromagnetic relay channel - Relays with SPDT switch contacts: Normally Open, Common, Normally Closed - Relay contact resistance 100 milliohms max. ( initial value ) - Relay insulation resistance 100 MOhm min. (DC 500V) - Relay operation time 8 ms max - Relay release time 5ms max - Relay dielectric strength 750 VAC, 50/60Hz between contact - Relay dielectric strength 1,500 VAC, 50/60Hz between all elements - Relay expected life Mechanical - 10,000,000 operations min. - Relay expected life Electrical - 100,000 operations min. at rated load - Working temperature range - 25 C ~ + 80 C - Comes with different slave address 0x27 or 0x3F, depends on the batch - Each board can be assigned an I2C address between 0x20...0x27 (0x38...0x3F) by the DIP switch - The module contains an PCF8574 or PCF8574A chip - The SDA and SCL lines are pulled up to D.VCC with 5.6k resistors on the relay module. - Up to 8 boards can be connected to I2C bus line. --- **PIN description:** - A.VCC - analog (relays) power supply - A.GND - analog (relays) ground - D.VCC - logic side (digital) power supply - D.GND - logic side (digital) ground - SDA - i2c serial data - SCL - i2c serial clock --- **Sample codes:** - Arduino sample code for 0x27 slave address - https://drive.google.com/open?id=1bhoR4dusLg54g0WM_b_a0Efto5wGJ3SZ - Arduino sample code for 0x3F slave address - https://drive.google.com/open?id=14HXx25LMoYRrmThCqxxRv5AvvmoChJDV - Code for controlling each channel separately - https://drive.google.com/open?id=1xvJZBvRlOtW8DJ1urEnSKOScQ5fM5Zs1 - Multiboards controlling code - https://drive.google.com/open?id=131HilQV8ZbCkEMC_oS3NJGbEQn-aUKaF - Home Assistant *yaml code - https://drive.google.com/file/d/1puJG7e_3uAKEAuQfctY5cBt5C62L2Q1I/view?usp=sharing --- **Free contact me, if you have any question !**