{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MAX6639ATE+","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"MAX6639ATE","canonicalUrl":"https://icboms.com/analog-devices/MAX6639ATE","factsUrl":"https://icboms.com/api/mcp/products/MAX6639ATE%2B","rawCanonicalId":null},"summary":{"shortDescription":"Maxim Integrated MAX6639ATE+, IC Temp Monitor 2-Channel, ±2°C Local / ±1°C Remote Accuracy, I²C/SMBus, 3V-3.6V, -40°C to +125°C, 16-TQFN (5x5), Tube.","salesMarkdown":"## What this part is and where it fits The Maxim Integrated MAX6639ATE+ is a two-channel temperature monitor with integrated fan control, packing an ADC, PWM generator, and tachometer counter into a single 16-TQFN package. It reads its own die temperature and one external diode-connected transistor over a 0°C to 150°C sensing range, reporting ±2°C local and ±1°C remote accuracy. The I²C/SMBus interface lets a host controller read temperatures and set fan speed without extra glue logic. This is the kind of part you drop onto a server motherboard, a telecom line card, or an industrial controller where you need closed-loop thermal management and don't want to route analog signals across the board. ## Accuracy and sensor choice — what the numbers mean for your BOM The ±1°C remote accuracy is the headline number: it means you can trust the external diode reading to within a degree, which matters when you're setting a fan speed threshold or a thermal shutdown limit. The local sensor is ±2°C, fine for board-level monitoring. The external sensor must be a diode-connected transistor (not a thermistor) — the part expects the -2mV/°C slope of a silicon junction. A common diode-connected transistor with base and collector tied works; Maxim also sells dedicated sensor transistors. The 0°C to 150°C external range covers most hot spots, but the part itself runs from -40°C to 125°C, so it survives the ambient around a hot chassis. ## Package and mounting — field-swappable? It comes in a 16-TQFN (5x5 mm) with an exposed pad — that means you need a reflow station or a hot-air tool to swap it. Not a field-swap part unless you carry a hot-air pencil in your kit. The exposed pad must be soldered to a thermal land on the PCB for the local sensor to read board temperature accurately. ## Lifecycle and sourcing — active, no LTB worry The MAX6639ATE+ is listed as Active with ROHS3 compliance. No last-time-buy risk for ongoing production. If you're freezing a BOM, this part won't trigger a PCN-driven respin anytime soon.","metaTitle":"MAX6639ATE+ Temp Monitor, ±1°C Remote Accuracy, 16-TQFN","metaDescription":"MAX6639ATE+ temperature monitor with ±2°C local, ±1°C remote accuracy. I²C/SMBus output, fan control. Active, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tube","Accuracy":"±2°C Local(Max), ±1°C Remote(Max)","Function":"Fan Control, Temp Monitor","Topology":"ADC, PWM Generator, Tach Counter","Output Fan":"Yes","Output Type":"I²C/SMBus","Sensor Type":"Internal and External","Output Alarm":"Yes","Mounting Type":"Surface Mount","Package / Case":"16-WQFN Exposed Pad","lifecycle_stage":"eol_hot","Voltage - Supply":"3V ~ 3.6V","Sensing Temperature":"0°C ~ 150°C, External Sensor","Operating Temperature":"-40°C ~ 125°C","Supplier Device Package":"16-TQFN (5x5)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.13","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$6.13000","currency":"USD"},{"qty":5,"price":"$5.41000","currency":"USD"},{"qty":10,"price":"$4.78000","currency":"USD"},{"qty":25,"price":"$3.87760","currency":"USD"},{"qty":50,"price":"$3.42680","currency":"USD"},{"qty":100,"price":"$3.33670","currency":"USD"},{"qty":500,"price":"$2.79558","currency":"USD"},{"qty":1000,"price":"$2.61522","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/56d795c8d3baaebf1291a99e14c4985f.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is MAX6639ATE+ active or obsolete?","answer":"Active. The lifecycle status is current, with no end-of-life notice. It is ROHS3 compliant."},{"question":"What is the accuracy of MAX6639ATE+?","answer":"±2°C maximum local accuracy and ±1°C maximum remote accuracy when using a diode-connected transistor as the external sensor."},{"question":"Does MAX6639ATE+ work with any external sensor?","answer":"It works with an external diode-connected transistor (such as a 2N3906 with base and collector tied). It does not work with a thermistor — the part expects the -2mV/°C temperature coefficient of a silicon junction."},{"question":"Is MAX6639ATE+ compatible with 3.3V I2C?","answer":"Yes. The supply voltage range is 3V to 3.6V, and the I²C/SMBus interface operates at those levels. No level shifting is needed if the host runs at 3.3V."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/MAX6639ATE","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/MAX6639ATE when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}