{"product_id":"4-channel-tlp281-optocoupler-isolation-module-arduino","title":"4-Channel TLP281 Optocoupler Module for Arduino | Isolation Board","description":"\n\u003ch2\u003e4-Channel TLP281 Optocoupler Isolation Module for Arduino \u0026amp; Microcontrollers\u003c\/h2\u003e\n\u003cp\u003eProtect your microcontroller from high-voltage systems and electrical noise with this compact 4-Channel Opto-isolator Module built around the TLP281 IC. Ideal for Arduino, Raspberry Pi, and single-chip microcomputer (SCM) projects, this breakout board creates a solid electrical barrier between your low-voltage logic side and higher-voltage output circuits — keeping your sensitive components safe and your signals clean.\u003c\/p\u003e\n\n\u003ch3\u003eHow It Works\u003c\/h3\u003e\n\u003cp\u003eInside the TLP281 IC are four LEDs paired with four photodiodes. When a signal is applied to an input pin (IN1–IN4), light crosses the isolation barrier to trigger the corresponding output (OUT1–OUT4) — all without any direct electrical connection between the two sides. Onboard transistors correct the natural signal inversion produced by standard opto-isolators, so the logic you put in is faithfully replicated on the high-voltage output side.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4 Independent Channels:\u003c\/strong\u003e IN1\/IN2\/IN3\/IN4 independently control OUT1\/OUT2\/OUT3\/OUT4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow-to-High Voltage Control:\u003c\/strong\u003e Drive 9V or 12V (up to 24V HVCC max) circuits from a 3.3V or 5V microcontroller\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLogic-Preserving Design:\u003c\/strong\u003e Onboard transistors correct signal inversion — input logic is replicated at the output\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectrical Noise Barrier:\u003c\/strong\u003e Isolates noisy motor\/servo circuits from your sensitive MCU logic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Sink Current:\u003c\/strong\u003e Maximum absorption current of 500 mA per channel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eArduino \u0026amp; SCM Compatible:\u003c\/strong\u003e GND connects directly to your Arduino or microcontroller ground\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact PCB:\u003c\/strong\u003e Only 25 × 24 mm (approx. 0.98 × 0.94 in) — fits tight enclosures and breadboard builds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIP Package IC:\u003c\/strong\u003e Easy to inspect and replace if needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIC Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTLP281-A (4-channel)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Voltage (LV side)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.3V or 5V (TTL\/CMOS logic)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh-Voltage Supply (HVCC)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 24V max\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 (OUT1, OUT2, OUT3, OUT4)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Sink Current per Channel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e500 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Current (typical)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHVCC ÷ 5.1 kΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDIP\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePCB Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25 × 24 mm \/ 0.98 × 0.94 in\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eArduino and microcontroller projects controlling motors, relays, or servos at higher voltages\u003c\/li\u003e\n  \u003cli\u003eIsolating signal lines in electrically noisy environments (motor drives, PWM circuits)\u003c\/li\u003e\n  \u003cli\u003eLevel shifting between 3.3V and 5V\/12V\/24V systems\u003c\/li\u003e\n  \u003cli\u003eIndustrial automation prototyping and DIY electronics\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 4-Channel TLP281 Opto-isolator IC Module for Arduino \/ MCU Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.energystar.gov\/products\" target=\"_blank\" rel=\"noopener\"\u003eENERGY STAR product efficiency guidance\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the maximum high-voltage supply (HVCC) this opto-isolator module can handle?\u003c\/h4\u003e\n\u003cp\u003eA: The HVCC input on this 4-channel TLP281 module supports a maximum of 24V. It is commonly used to interface a 3.3V or 5V microcontroller with 9V or 12V output circuits, such as motors and relays.\u003c\/p\u003e\n\u003ch4\u003eQ: Does this module invert the input signal like a standard opto-isolator?\u003c\/h4\u003e\n\u003cp\u003eA: No — unlike bare LED opto-isolators that naturally invert the signal, this board includes onboard transistors that correct the inversion. The logic level you apply at an IN pin is faithfully replicated at the corresponding OUT pin on the high-voltage side.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this module compatible with Arduino boards?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The input pins (IN1–IN4) connect directly to Arduino digital I\/O ports, and the GND pin connects to your Arduino ground. It works seamlessly with 3.3V and 5V Arduino and other microcontroller platforms.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use all four channels simultaneously and independently?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. Each of the four channels operates independently — IN1 controls OUT1, IN2 controls OUT2, and so on. All four can be active at the same time without interference.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the maximum high-voltage supply (HVCC) this opto-isolator module can handle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The HVCC input on this 4-channel TLP281 module supports a maximum of 24V. 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