{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4N25300","brand":"onsemi","brandSlug":"onsemi","productSlug":"4N25300","canonicalUrl":"https://icboms.com/onsemi/4N25300","factsUrl":"https://icboms.com/api/mcp/products/4N25300","rawCanonicalId":null},"summary":{"shortDescription":"onsemi 4N25 series optoisolator, 4N25300, 1-channel DC input, transistor with base output, 5300Vrms isolation, 6-DIP (0.300\", 7.62mm) through-hole package, tube.","salesMarkdown":"## 5300Vrms isolation in a 6-DIP through-hole package The onsemi 4N25300 is a single-channel optoisolator in the 4N25 family, providing 5300Vrms galvanic isolation between a DC input LED and a phototransistor output with the base brought out. The 6-DIP (0.300\", 7.62mm) through-hole package suits legacy board layouts where surface-mount reflow is not an option — common in industrial control cards, PLC I/O modules, and power-supply feedback paths that need a clean isolation barrier. ## 20% minimum CTR at 10 mA — the coupling margin that matters A minimum current transfer ratio of 20% at 10 mA forward current means the output transistor sinks at least 2 mA collector current when the LED is driven at 10 mA. That is the floor for worst-case coupling — if your downstream logic threshold needs 1 mA, you have 100% headroom before the link drops out. The typical forward voltage is 1.18 V at that drive current, so the LED drop is predictable across temperature. Switching is rated at 2 µs turn-on and 2 µs turn-off typical — fast enough for 100 kHz data rates in isolated serial links or gate-drive feedback, but not for high-speed digital isolation above 1 Mbps. The 30 V maximum collector-emitter voltage on the output side covers 24 V logic rails and 15 V analog supplies with margin. onsemi has marked the 4N25300 as obsolete. No pin-compatible direct replacement from onsemi is documented, so a BOM substitution would require validating the CTR, isolation voltage, and switching speed against the application.","metaTitle":"onsemi 4N25300 Optoisolator, 5300Vrms, 6-DIP, Obsolete","metaDescription":"onsemi 4N25300 obsolete optoisolator, 1-channel DC input, transistor output, 5300Vrms isolation, 6-DIP.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Optoisolators"],"specifications":{"Mfr":"onsemi","Series":"-","Package":"Tube","Input Type":"DC","Output Type":"Transistor with Base","Mounting Type":"Through Hole","Package / Case":"6-DIP (0.300\\\", 7.62mm)","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Number of Channels":"1","Base Product Number":"4N25","Voltage - Isolation":"5300Vrms","Vce Saturation (Max)":"500mV","Operating Temperature":"-55°C ~ 100°C","Rise / Fall Time (Typ)":"-","Voltage - Output (Max)":"30V","Supplier Device Package":"6-DIP","Current - Output / Channel":"-","Current Transfer Ratio (Max)":"-","Current Transfer Ratio (Min)":"20% @ 10mA","Voltage - Forward (Vf) (Typ)":"1.18V","Turn On / Turn Off Time (Typ)":"2µs, 2µs","Current - DC Forward (If) (Max)":"100 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6900","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cdfaf651d7a1a3387e48131363a5f4f6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/4N25300/alternatives.json"},"ai":{"faq":[{"question":"What is the 4N25300's input and output type?","answer":"The input is DC (LED), and the output is a phototransistor with the base terminal brought out. This allows external base drive or a resistor to tailor the switching threshold."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/4N25300","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/4N25300 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T06:19:29.155Z","lastPublished":"2026-07-21T06:19:29.155Z","indexable":true}}