{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4N37M","brand":"onsemi","brandSlug":"onsemi","productSlug":"4N37M","canonicalUrl":"https://icboms.com/onsemi/4N37M","factsUrl":"https://icboms.com/api/mcp/products/4N37M","rawCanonicalId":null},"summary":{"shortDescription":"onsemi 4N37M, single-channel DC-input optoisolator, transistor with base output, 4170Vrms isolation, 100% min CTR at 10mA, 6-DIP through-hole package, -40°C to 100°C operating range.","salesMarkdown":"## Galvanic isolation with a base pin for bias flexibility The 4N37M is a single-channel optoisolator from onsemi that couples a DC-input LED to a phototransistor with a separate base connection. The base pin lets you set the switching threshold with an external resistor or bias network, which is useful when you need to adjust the turn-on point independent of the LED drive current. Rated for 4170Vrms isolation, it fits applications where the control side must be electrically isolated from the load — think PLC digital inputs, motor drive feedback, or AC mains detection circuits. The 6-DIP through-hole package is a standard footprint that mates with sockets or solders directly into plated through-holes; no reflow profile to manage. ## CTR floor and saturation voltage — what they mean for your drive budget Minimum current transfer ratio is 100% at If=10mA. That means with 10mA through the LED, the phototransistor can sink at least 10mA collector current while keeping Vce below 300mV. If your load needs more collector current, scale the LED drive proportionally — but stay under the 60mA absolute maximum forward current. The 300mV Vce saturation at 10mA collector current is the floor for the output voltage drop when the transistor is fully on. In a 5V logic interface, that leaves 4.7V at the collector — enough to guarantee a logic-high into a CMOS input. For higher collector currents, expect Vce(sat) to rise; the datasheet curve shows the trade-off. ## Active production — no obsolescence risk on this BOM line No end-of-life notice or successor has been issued. For a through-hole optoisolator in a mature package, this means stable supply and no forced redesign — the kind of part you can qualify once and leave in the BOM for years. The 6-DIP body is 0.300-inch wide, which is the industry-standard DIP-6 width — compatible with sockets and automatic insertion equipment.","metaTitle":"4N37M onsemi 4170Vrms Transistor Output 6-DIP","metaDescription":"onsemi 4N37M optoisolator: 4170Vrms isolation, 100% min CTR at 10mA, 300mV Vce sat, -40°C to 100°C. Active production, through-hole 6-DIP.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","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":"Active","lifecycle_stage":"eol_hot","Number of Channels":"1","Base Product Number":"4N37","Voltage - Isolation":"4170Vrms","Vce Saturation (Max)":"300mV","Operating Temperature":"-40°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)":"100% @ 10mA","Voltage - Forward (Vf) (Typ)":"1.18V","Turn On / Turn Off Time (Typ)":"2µs, 2µs","Current - DC Forward (If) (Max)":"60 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7000","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.77000","currency":"USD"},{"qty":10,"price":"$0.49900","currency":"USD"},{"qty":100,"price":"$0.32670","currency":"USD"},{"qty":1000,"price":"$0.25790","currency":"USD"},{"qty":2000,"price":"$0.24071","currency":"USD"},{"qty":5000,"price":"$0.23211","currency":"USD"},{"qty":10000,"price":"$0.22867","currency":"USD"},{"qty":25000,"price":"$0.22351","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/d7db4dc53d56bf7e534658a700fb47e3.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the Vce saturation of the 4N37M?","answer":"300mV maximum at 10mA collector current and 10mA forward current. This is the voltage drop across the output transistor when it is fully saturated."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/4N37M","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/4N37M when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T20:06:59.938Z","lastPublished":"2026-07-17T20:06:59.938Z","indexable":true}}