{"product_id":"optocoupler-tester-module-4-pin-online-test-gen-3-4-5-6","title":"Optocoupler Tester Module – 4-Pin Online Test Gen 3\/4\/5\/6","description":"\n\u003ch2\u003eOptocoupler Tester Module – Fast, Accurate 4-Pin Detection Online\u003c\/h2\u003e\n\u003cp\u003eWhether you're a seasoned electronics technician or a passionate DIY repair enthusiast, this \u003cstrong\u003eOptocoupler Tester Module\u003c\/strong\u003e makes verifying 4-pin optocouplers quick and straightforward. Simply connect via USB or USB-C, touch the probe to your component, and let the LED indicator tell you instantly whether the optocoupler is functioning correctly — no guesswork, no complicated setup.\u003c\/p\u003e\n\u003cp\u003eAvailable in four generations (3rd, 4th, 5th, and 6th), each version brings incremental upgrades including Type-C connectivity, surface-mount (patch) optocoupler testing, and even a built-in flashlight with rechargeable battery in the 6th generation.\u003c\/p\u003e\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOnline (In-Circuit) Testing:\u003c\/strong\u003e Test optocouplers directly on the board without desoldering — a huge time-saver during diagnostics.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstant LED Feedback:\u003c\/strong\u003e A flashing indicator light confirms a good optocoupler; a steady on\/off state signals a fault. No meters or readings to interpret.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4-Pin Optocoupler Compatible:\u003c\/strong\u003e Designed specifically for standard 4-pin DIP optocouplers (through-hole). Generations 5 \u0026amp; 6 also support surface-mount (patch) optocouplers.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUSB \/ Type-C Powered:\u003c\/strong\u003e Gen 3 uses a standard USB-A interface; Gens 4, 5, and 6 use a modern Type-C connector. Gen 6 includes an onboard battery for untethered use.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in Power Indicator:\u003c\/strong\u003e Gens 4, 5, and 6 light up as soon as power is connected, so you always know the tester is ready.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGen 6 Flashlight:\u003c\/strong\u003e Integrated LED flashlight illuminates the work area for precision testing in low-light conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact PCB Design:\u003c\/strong\u003e Green PCB construction with clearly marked PIN 1 reference, making probe placement fast and accurate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eGeneration Comparison\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n      \u003cth style=\"padding:8px; border:1px solid #ddd;\"\u003eGeneration\u003c\/th\u003e\n      \u003cth style=\"padding:8px; border:1px solid #ddd;\"\u003eInterface\u003c\/th\u003e\n      \u003cth style=\"padding:8px; border:1px solid #ddd;\"\u003ePower LED\u003c\/th\u003e\n      \u003cth style=\"padding:8px; border:1px solid #ddd;\"\u003eSMD (Patch) Test\u003c\/th\u003e\n      \u003cth style=\"padding:8px; border:1px solid #ddd;\"\u003eFlashlight\u003c\/th\u003e\n      \u003cth style=\"padding:8px; border:1px solid #ddd;\"\u003eBattery\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e3rd Gen\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eUSB-A\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eNo\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eNo\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eNo\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eNo\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f9f9f9;\"\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e4th Gen\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eType-C\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eYes\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eNo\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eNo\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eNo\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e5th Gen\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eType-C\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eYes\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eYes\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eNo\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eNo\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f9f9f9;\"\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e6th Gen\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eType-C\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eYes\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eYes\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eYes\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eYes\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Name:\u003c\/strong\u003e Optocoupler Tester\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Green (PCB)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e PCB + Electronic Components\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Component:\u003c\/strong\u003e 4-Pin DIP Optocouplers (Gens 5 \u0026amp; 6 also support SMD patch optocouplers)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower Input:\u003c\/strong\u003e USB-A (Gen 3) \/ Type-C (Gens 4, 5, 6)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow to Use\u003c\/h3\u003e\n\u003col\u003e\n  \u003cli\u003eConfirm the circuit board under test is \u003cstrong\u003ecompletely powered off\u003c\/strong\u003e and that all electrolytic capacitors are fully discharged before testing. Never test on a live board.\u003c\/li\u003e\n  \u003cli\u003eIdentify \u003cstrong\u003ePIN 1\u003c\/strong\u003e of the optocoupler — it is the pin marked with a small dot. The tester board has a corresponding PIN 1 marker.\u003c\/li\u003e\n  \u003cli\u003eConnect the tester to a USB power source via the appropriate cable.\u003c\/li\u003e\n  \u003cli\u003eTouch the tester probe to the optocoupler. A \u003cstrong\u003eflashing LED\u003c\/strong\u003e indicates the component is functioning correctly. Steady on or steady off indicates a fault.\u003c\/li\u003e\n  \u003cli\u003eIf results are inconclusive, remove the optocoupler from the board and insert it directly into the tester's DIP socket on the breadboard for confirmation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Optocoupler Tester Module (generation of your choice)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino\"\u003e1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-scr-solid-state-relay-switch-module-dc3-24v-40a-optocoupler\"\u003e1-Channel SCR Solid State Relay Module DC3-24V 40A Optocoupler\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-25mm-1000-turn-precision-copper-inductor-coil-diy-electronics\"\u003e0.25mm 1000-Turn Precision Copper Inductor Coil for DIY Circuits\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor general guidance on electrical safety when working on circuit boards, refer to \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA's Electrical Safety Guidelines\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Can this optocoupler tester check components while still soldered on the motherboard?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — this tester is specifically designed for online (in-circuit) testing, meaning you can test 4-pin optocouplers directly on the board without desoldering them. Just ensure the board is completely powered off and capacitors are discharged before making contact with the probe.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What does the flashing LED mean during testing?\u003c\/h4\u003e\n\u003cp\u003eA: A flashing LED indicator confirms the optocoupler is functioning correctly. If the light remains steadily on or stays completely off, the optocoupler is likely faulty and should be removed and retested in the tester's dedicated DIP socket for confirmation.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Which generation should I choose?\u003c\/h4\u003e\n\u003cp\u003eA: If you only need basic through-hole (DIP) optocoupler testing with a simple USB connection, the 3rd generation is sufficient. For modern Type-C connectivity, choose Gen 4. If you also need to test surface-mount (SMD\/patch) optocouplers, go with Gen 5 or Gen 6. The 6th generation is the most advanced, adding a built-in flashlight and onboard rechargeable battery for fully portable, untethered use.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this tester compatible with all types of optocouplers?\u003c\/h4\u003e\n\u003cp\u003eA: This tester is designed for standard 4-pin DIP optocouplers. Generations 5 and 6 additionally support surface-mount (patch) 4-pin optocouplers. Other optocoupler types (e.g., 6-pin, 8-pin) are not currently supported.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Can this optocoupler tester check components while still soldered on the motherboard?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — this tester is specifically designed for online (in-circuit) testing, meaning you can test 4-pin optocouplers directly on the board without desoldering them. 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The 6th generation is the most advanced, adding a built-in flashlight and onboard rechargeable battery for fully portable, untethered use.\"}}, {\"@type\": \"Question\", \"name\": \"Is this tester compatible with all types of optocouplers?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This tester is designed for standard 4-pin DIP optocouplers. Generations 5 and 6 additionally support surface-mount (patch) 4-pin optocouplers. Other optocoupler types (e.g., 6-pin, 8-pin) are not currently supported.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/oasis-select.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Electronics \u0026 Tech\", \"item\": \"https:\/\/oasis-select.com\/collections\/electronics-tech\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Optocoupler Tester Module – 4-Pin Online Test Gen 3\/4\/5\/6\", \"item\": \"https:\/\/oasis-select.com\/products\/optocoupler-tester-module-4-pin-online-test-gen-3-4-5-6\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"6th","offer_id":47748570677353,"sku":"14:350853#6th","price":20.73,"currency_code":"USD","in_stock":true},{"title":"5th","offer_id":47748570710121,"sku":"14:350852#5th","price":20.73,"currency_code":"USD","in_stock":true},{"title":"4th","offer_id":47748570742889,"sku":"14:350850#4th","price":20.73,"currency_code":"USD","in_stock":true},{"title":"3rd","offer_id":47748570775657,"sku":"14:365458#3rd","price":20.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/S88cc995386294eee8a691b84b8ff3f4cT.webp?v=1783086196","url":"https:\/\/oasis-select.com\/products\/optocoupler-tester-module-4-pin-online-test-gen-3-4-5-6","provider":"Oasis Select","version":"1.0","type":"link"}