{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FODM124","brand":"onsemi","brandSlug":"onsemi","productSlug":"FODM124","canonicalUrl":"https://icboms.com/onsemi/FODM124","factsUrl":"https://icboms.com/api/mcp/products/FODM124","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FODM124, single-channel DC-input transistor-output optoisolator, 3750Vrms isolation, 4-SMD Gull Wing package, -40°C to 110°C operating range.","salesMarkdown":"## 3750Vrms isolation in a 4-SMD Gull Wing package The FODM124 is a single-channel optoisolator from onsemi that passes 3750Vrms of galvanic isolation between a DC-input LED and a phototransistor output. That isolation rating suits it for breaking ground loops in industrial sensor interfaces, PLC digital inputs, and low-power signal isolation where you need to keep the field side separate from the controller side. The 4-SMD Gull Wing footprint is a standard surface-mount package — it reflows on a normal lead-free profile without special handling. ## CTR spread and output drive capability The current transfer ratio is specified from 100% minimum to 1200% maximum, both measured at 1 mA forward current. That wide spread means the designer must bias the LED for the worst-case 100% CTR to guarantee the output transistor saturates — a 1 mA forward current yields at least 1 mA of collector current at the output. The 80V collector-emitter breakdown and 80 mA continuous output current give enough headroom to drive a logic gate input or a small relay coil directly. Compared to the FODM121B sibling, the FODM124 shares the same 3750Vrms isolation, same 3 µs rise/fall times, same 400 mV Vce saturation, and same temperature range. The difference is in the CTR bin: the FODM124's 100%-1200% range is wider than the FODM121B's typical bin, which gives more margin in designs where the LED drive current varies but also means the output saturation point is less predictable across temperature. ## Active lifecycle and compliance The FODM124 carries an Active product status from onsemi, with ROHS3 compliance — no lead, no phthalates, no restricted substances under the current EU directive. The -40°C to 110°C operating range covers industrial and outdoor telecom enclosures without needing a wider-temperature variant.","metaTitle":"FODM124 Optoisolator – onsemi 3750Vrms Transistor Output","metaDescription":"onsemi FODM124 single-channel DC-input transistor-output optoisolator. 3750Vrms isolation, 100%-1200% CTR at 1 mA, 80V/80mA output. Active, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Tube","Input Type":"DC","Output Type":"Transistor","Mounting Type":"Surface Mount","Package / Case":"4-SMD, Gull Wing","lifecycle_stage":"eol_hot","Number of Channels":"1","Voltage - Isolation":"3750Vrms","Vce Saturation (Max)":"400mV","Operating Temperature":"-40°C ~ 110°C","Rise / Fall Time (Typ)":"3µs, 3µs","Voltage - Output (Max)":"80V","Supplier Device Package":"4-SMD","Current - Output / Channel":"80mA","Current Transfer Ratio (Max)":"1200% @ 1mA","Current Transfer Ratio (Min)":"100% @ 1mA","Voltage - Forward (Vf) (Typ)":"1.3V (Max)","Current - DC Forward (If) (Max)":"50 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.67","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.67000","currency":"USD"},{"qty":10,"price":"$0.43900","currency":"USD"},{"qty":100,"price":"$0.29010","currency":"USD"},{"qty":1000,"price":"$0.22399","currency":"USD"},{"qty":2000,"price":"$0.20241","currency":"USD"},{"qty":5000,"price":"$0.18891","currency":"USD"},{"qty":10000,"price":"$0.18216","currency":"USD"},{"qty":25000,"price":"$0.17946","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/269c736c440b53ce097423b4caa3ac66.pdf","sourceUrl":null},"ai":{"faq":[{"question":"How can I order the FODM124 or request a quote?","answer":"The FODM124 is active and available to order against your BOM quantity. Submit an RFQ through this page — we source from our multi-distributor network and confirm current pricing and lead time at quote time. The part ships in tube packaging; if you need tape-and-reel, check the FODM124R2 variant."},{"question":"What is the closest functional second-source for the FODM124?","answer":"The FODM121B is a near-identical peer: same 3750Vrms isolation, same 3 µs rise/fall, same 400 mV Vce sat, same 4-SMD Gull Wing package. The main difference is the CTR bin — the FODM124 guarantees 100%-1200% at 1 mA, while the FODM121B has a tighter typical bin. Either part can substitute in most designs if the LED drive current is set for the worst-case minimum CTR."},{"question":"Is the FODM124 RoHS compliant and lead-free?","answer":"Yes, the FODM124 is ROHS3 compliant, which means it meets the current EU RoHS directive including the exemption for lead in solder. The part is lead-free and suitable for lead-free reflow profiles."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FODM124","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FODM124 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T20:09:36.114Z","lastPublished":"2026-07-17T20:09:36.114Z","indexable":true}}