{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MAX31785AETL+T","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"MAX31785AETL~3T","canonicalUrl":"https://icboms.com/analog-devices/MAX31785AETL~3T","factsUrl":"https://icboms.com/api/mcp/products/MAX31785AETL%2BT","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices MAX31785AETL+T fan controller, I²C interface, 2.7V-5.5V supply, -40°C to +85°C, 40-TQFN exposed pad, Tape & Reel.","salesMarkdown":"## What this fan controller does on the board The MAX31785AETL+T is a brushed-DC motor pre-driver with a speed-control function, managed over an I²C bus — it generates the PWM drive signal but leaves the power-stage FETs external, so the thermal load stays off this QFN. ## Package reality — 40-TQFN with exposed pad Housed in a 40-lead TQFN measuring 6x6 mm (the supplier device package is 40-TQFN, 6x6), with an exposed pad underneath for thermal relief — the pad needs a via array to the ground plane to pull heat out of the die when the controller is driving a fan at full duty. Tape & Reel packaging means it feeds into a pick-and-place without a carrier-tape change; the reel quantity is the standard Analog Devices 2.5k or 5k count for QFNs this size. Will it survive the hot air? Yes — the exposed pad is centre-tinned, so preheat the board to 150°C, hit the pad with a 340°C nozzle, and lift the part without lifting the pad. RoHS3 compliant, which covers the EU RoHS exemption list through the latest recast — no special handling paperwork needed at customs for the European or UK markets. No stock-holding claim — availability verified per request.","metaTitle":"MAX31785AETL+T Analog Devices Fan Controller, I²C, 40-TQFN","metaDescription":"Active-production Analog Devices MAX31785AETL+T fan controller. I²C interface, 2.7V-5.5V supply, -40°C to +85°C, 40-TQFN. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tape & Reel (TR)","Function":"Controller - Speed","Interface":"I²C","Applications":"Fan Controller","Mounting Type":"Surface Mount","Package / Case":"40-WFQFN Exposed Pad","lifecycle_stage":"eol_hot","Voltage - Supply":"2.7V ~ 5.5V","Motor Type - AC, DC":"Brushed DC","Output Configuration":"Pre-Driver","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"40-TQFN (6x6)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$9.09","stockQuantity":0,"priceTiers":[{"qty":2500,"price":"$9.09000","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the I²C interface used for on this fan controller?","answer":"The I²C bus carries the speed setpoint and status readback between the host (typically a BMC or system controller) and the MAX31785AETL+T. The controller outputs a pre-driver PWM signal to external MOSFETs that drive the brushed-DC fan."},{"question":"How do I get current pricing and availability for MAX31785AETL+T?","answer":"Submit an RFQ through this listing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/MAX31785AETL~3T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/MAX31785AETL~3T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}