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8 Channel I2C Electromagnetic Relay Module Opto Isolated PCF8574 3.3V 5.0V

8 Channel I2C Electromagnetic Relay Module Opto

Sold by Olegs Bugrovs's store

$21.67

No tax for United States [change]
This store is temporarely paused. We are on the summer vacation from 11 July till 27 July 2025.

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:


Free contact me, if you have any question !

Links to code and documentation

No additional links provided for this product.

Product HS Code: 854200

Shipping policy

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The seller

Olegs Bugrovs's store

Olegs Bugrovs's store logo

Riga, Latvia
31 orders since May 13, 2022
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