Yl105 Datasheet ((free)) May 2026

(specifically the FIT-221 YL105 series) is a general-purpose, yellow-colored heat shrink tubing manufactured by Alpha Wire

. It is primarily designed for cable and wire management, providing insulation and protection in harsh environments. Mouser Electronics India Key Features Irradiated Polyolefin (PO) , which offers high durability and reliability. Shrink Ratio: Features a 2:1 shrink ratio

, allowing it to provide a snug fit over irregular shapes and connectors. Temperature Range: Operating Temperature: Minimum Shrink Temperature: Durability & Protection: Flame Resistant:

Meets UL 224 flammability ratings, ensuring it will not spread fire in the event of an electrical fault. Fluid & Chemical Resistant:

Built to withstand exposure to various chemicals and fluids, making it suitable for industrial use. Electrical Properties: Provides a dielectric strength of Flexibility:

The tubing remains flexible after shrinking, preventing damage to the enclosed cables. Mouser Electronics India Common Applications The YL105 series is often used for: Electrical insulation and cable bundling. Color-coding (yellow) for identification. Strain relief and protection against abrasion or moisture. XTRA-GUARD 1 applications. Mouser Electronics India (like 1/2" or 3/4") or do you need the full PDF datasheet for a specific part number? FIT2213/4 YL105 Alpha Wire | Mouser India yl105 datasheet

Table_title: To show similar products, select at least one checkbox Table_content: header: | Product Attribute | Attribute Value | Mouser Electronics India Alpha Wire F2211IN YL105 - Heat Shrink Tubing - Utmel

Common Applications

  • Home automation (controlling lights, fans, garage doors)
  • Industrial control systems
  • IoT projects (e.g., watering system controlled by ESP8266)
  • DIY robotics (turning high-current motors on/off)
  • Safety cut-off circuits

Jumper Settings (Critical for Correct Operation)

A key detail missing from many quick-start guides is the jumper located near the optocoupler. This jumper determines the trigger logic:

  • Jumper attached (default): The module operates in active LOW mode. The relay activates when the IN pin is connected to GND (logic 0).
  • Jumper removed: The module operates in active HIGH mode. The relay activates when the IN pin receives +5V (logic 1).

Note: Some variants have a solder bridge instead of a jumper. Check your module carefully.

Basic Arduino Connection (Active HIGH)

  1. Connect VCC to Arduino 5V.
  2. Connect GND to Arduino GND.
  3. Connect IN to digital pin 7.
  4. Ensure jumper is removed (active HIGH).

Code Example:

int relayPin = 7;

void setup() 
pinMode(relayPin, OUTPUT);
digitalWrite(relayPin, LOW); // relay off initially
 Jumper Settings (Critical for Correct Operation) A key


void loop() 
digitalWrite(relayPin, HIGH); // turn relay ON
delay(2000);
digitalWrite(relayPin, LOW);  // turn relay OFF
delay(2000);

D. No Shielded Traces

The PCB layout (visible in the datasheet’s mechanical drawing) has long, unshielded traces. This makes the module susceptible to EMI from motors or power supplies. The datasheet provides zero guidance on filtering or external capacitors.

3. Pinout Configuration

The YL-105 module typically features a standard 2.54mm pitch header (usually 8 pins).

| Pin Number | Pin Name | Description | | :--- | :--- | :--- | | 1 | GND | Ground (Power Supply Negative) | | 2 | VCC | Power Supply (1.9V – 3.6V) | | 3 | CSN | SPI Chip Select (Active Low) | | 4 | SCK | SPI Clock Input | | 5 | MOSI | SPI Data Input (Master Out Slave In) | | 6 | MISO | SPI Data Output (Master In Slave Out) | | 7 | GIO1 | General Purpose I/O / Interrupt Pin 1 | | 8 | GIO2 | General Purpose I/O / Interrupt Pin 2 | trigger logic levels

(Note: Pin numbering may vary slightly depending on the specific PCB revision, but GND/VCC are usually on the ends. Always verify with the silkscreen on your specific board.)

Introduction

In the world of electronics and microcontroller projects (Arduino, Raspberry Pi, ESP8266, STM32), the ability to control high-power devices—such as lamps, motors, solenoids, and pumps—using low-power logic signals is essential. The YL105 is one of the most popular and widely available single-channel relay modules designed precisely for this purpose.

If you have searched for the yl105 datasheet, you are likely looking for pinout specifications, trigger logic levels, power requirements, or application diagrams. While the YL105 is a generic module (often manufactured by multiple vendors without a single "official" datasheet), this article consolidates the standard specifications, electrical characteristics, and usage guidelines that apply to 99% of YL105 modules found on the market.

By the end of this guide, you will have all the information equivalent to a full manufacturer’s datasheet, enabling you to safely and effectively integrate the YL105 into your projects.