YX202-S-112DMF

Overview

YX202-S-112DMF 12V DC Relay with Normally Open (NO) contact rated at 10A. Designed for switching high-current loads in embedded systems, home automation, industrial control, and IoT applications. Compatible with Arduino, ESP32, STM32, and other microcontroller platforms via a transistor driver circuit.

Specifications

Parameter	Value
Model	YX202-S-112DMF
Coil Voltage	12V DC
Contact Configuration	SPST-NO (Normally Open)
Contact Rating AC	10A / 250VAC
Contact Rating DC	10A / 30VDC
Coil Resistance	~360Ω
Coil Power	~400mW
Package	Through-hole PCB mount
Operating Temperature	-40°C to +85°C
Switching Time	≤10ms
Release Time	≤5ms

Features

• 12V coil — suitable for 12V powered systems
• Normally Open (NO) — circuit opens when relay is de-energized
• 10A contact rating — handles motors, lights, pumps, heaters
• PCB mount — easy soldering and integration
• Low coil power — efficient for battery-powered systems
• Compatible with transistor driver circuits (NPN 2N2222, BC547, ULN2003)

Wiring

• COM — Common terminal
• NO — Normally Open (connects when relay is energized)
• Coil Pin 1 — Connect to 12V via transistor collector
• Coil Pin 2 — Connect to GND

Driver Circuit (with ESP32 / Arduino)

• Use NPN transistor (2N2222 or BC547)
• Base → 1kΩ resistor → GPIO pin
• Collector → Relay coil pin 1
• Emitter → GND
• Add flyback diode (1N4007) across coil pins

Applications

• Motor ON/OFF switching
• 12V solenoid valve control
• AC load switching (lights, fans, heaters)
• Industrial automation
• Smart home relay control
• Battery-powered IoT systems