{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MAX6645ABFAUB+","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"MAX6645ABFAUB","canonicalUrl":"https://icboms.com/analog-devices/MAX6645ABFAUB","factsUrl":"https://icboms.com/api/mcp/products/MAX6645ABFAUB%2B","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices MAX6645ABFAUB+ fan-speed controller, internal and external sensor, ±3.5°C local / ±3°C remote accuracy, PWM output, 10-uMAX/uSOP package, Tube.","salesMarkdown":"## Fan-speed controller with dual temperature sensing The MAX6645ABFAUB+ from Analog Devices integrates a temperature monitor and fan-speed controller in a single 10-uMAX/uSOP package. It measures its own die temperature and one external diode-connected transistor, combining local and remote sensing into one control loop. Accuracy is ±3.5°C (max) on the local channel and ±3°C (max) on the remote channel — tight enough to set fan-speed ramps based on a hot spot like a CPU core or power-stage die without overshooting the thermal budget. ## What the functional blocks mean for your BOM The part contains an ADC, a PWM generator, and a tachometer counter. The ADC digitises both temperature channels; the PWM generator drives the fan directly from the PWM output pin; the tach counter reads the fan's speed signal to close the loop. This means a single IC replaces a discrete thermistor, comparator, and PWM driver — saving board area and reducing the BOM count for a speed-controlled fan. The operating temperature range covers -40°C to +125°C, matching the industrial temperature grade — suitable for equipment enclosures where ambient air can reach 85°C and the local die runs hotter. The remote sensor input accepts an external diode-connected transistor (typically a 2N3906 or a substrate PNP on an ASIC). The sensing range for the external sensor is -40°C to +125°C, so it can monitor a processor die or a power MOSFET case across the full industrial temperature span. The 10-TFSOP / 10-MSOP package has a 0.118-inch (3.00 mm) body width and a 0.50 mm lead pitch. The supplier device package is designated 10-uMAX/uSOP. For pick-and-place assembly, order the tape-and-reel variant if available; the tube quantity is typically 50 or 100 pieces depending on the supplier's packaging code. No official successor or pin-compatible alternative is listed by Analog Devices. If a second-source is needed for a dual-source BOM, the closest functional match is another device in the MAX6645 family with the same package code — confirm the accuracy grade and the PWM frequency range before substituting.","metaTitle":"MAX6645ABFAUB+ Fan Controller, ±3°C Remote Accuracy, 10-uMAX","metaDescription":"Analog Devices MAX6645ABFAUB+ fan-speed controller with ±3.5°C local / ±3°C remote accuracy. Active production, ROHS3. Sourced to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Package":"Tube","Accuracy":"±3.5°C Local(Max), ±3°C Remote(Max)","Function":"Fan Control, Temp Monitor","Topology":"ADC, PWM Generator, Tach Counter","Output Fan":"Yes","Output Type":"PWM","Sensor Type":"Internal and External","Output Alarm":"Yes","Mounting Type":"Surface Mount","Package / Case":"10-TFSOP, 10-MSOP (0.118\\\", 3.00mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"3V ~ 5.5V","Sensing Temperature":"-40°C ~ 125°C, External Sensor","Operating Temperature":"-40°C ~ 125°C","Supplier Device Package":"10-uMAX/uSOP"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.75","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$3.75000","currency":"USD"},{"qty":10,"price":"$3.36500","currency":"USD"},{"qty":25,"price":"$3.18160","currency":"USD"},{"qty":100,"price":"$2.75730","currency":"USD"},{"qty":250,"price":"$2.61592","currency":"USD"},{"qty":500,"price":"$2.34724","currency":"USD"},{"qty":1000,"price":"$1.97960","currency":"USD"},{"qty":2500,"price":"$1.88062","currency":"USD"},{"qty":5000,"price":"$1.80992","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the accuracy of the MAX6645ABFAUB+?","answer":"Local temperature accuracy is ±3.5°C (max), and remote temperature accuracy is ±3°C (max). These are the worst-case limits over the full operating temperature range."},{"question":"What package does the MAX6645ABFAUB+ come in?","answer":"It ships in a Tube."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/MAX6645ABFAUB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/MAX6645ABFAUB when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}