16-Channel 5V Relay Module with Optocoupler for ESP32 IoT
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Prices updated: 12 Oct 2026
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About this product
This 16-channel relay board has a 5 V control interface, optocoupler isolation and an indicator LED for each output. Each channel has an independent common (COM) terminal. Loads up to AC 250 V / 10 A are supported, and it is intended for switching appliances, lighting and industrial loads from an ESP32 or other microcontroller. Board size is 166 x 134 mm.
Specifications
- Number of channels
- 16
- Control signal voltage
- 5 V
- Load rating
- AC 250V/10A, AC 125V/15A, DC 30V 10A
- Isolation
- Optocoupler on each channel
- Indicator
- LED per channel
- Dimensions
- 166 x 134 mm
Frequently asked questions
Can the ESP32 3.3V GPIO drive this relay board directly?
The control signal is listed at 5 V, while ESP32 GPIO outputs 3.3 V logic. Some boards trigger reliably at 3.3 V, but check the input threshold. If it does not switch reliably, use a level shifter or transistor stage.
Can I power the relays from the ESP32 board?
No. The relay coils need a separate 5 V supply sized for all relays that may switch at once. Do not draw that current from the ESP32 development board's 5 V pin, and connect all grounds together.
