{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ADM1021ARQ","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"ADM1021ARQ","canonicalUrl":"https://icboms.com/analog-devices/ADM1021ARQ","factsUrl":"https://icboms.com/api/mcp/products/ADM1021ARQ","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices ADM1021ARQ, Temp Monitoring System (Sensor), Internal and External Sensor, ±1°C Local / ±5°C Remote Accuracy, SMBus Output, 3V–5.5V Supply, 16-SSOP/QSOP, Surface Mount.","salesMarkdown":"## What the ADM1021ARQ does and where it fits The ADM1021ARQ from Analog Devices is a temperature monitoring system that combines an internal temperature sensor with support for an external diode-connected transistor, letting it measure its own die temperature and a remote junction simultaneously. It reports both readings over an SMBus interface and asserts an alarm output when either temperature exceeds a programmed limit. The part is built around an internal ADC, comparator, multiplexer, and register bank — it handles the conversion and decision logic without needing a host microcontroller to poll continuously. The supply range spans 3V to 5.5V, so it can sit on a 3.3V or 5V rail without an extra regulator. The operating temperature range is 0°C to 100°C, and the external sensor is specified over the same 0°C to 100°C window — typical for equipment that runs inside a conditioned enclosure: server racks, telecom line cards, base stations, and industrial controllers where the board ambient stays below 100°C. ## Accuracy split — local vs remote The local sensor is rated at ±1°C, which is tight enough for most board-level thermal monitoring — you can trust it to trigger a fan ramp or throttle a processor before the junction hits its critical limit. The remote channel is specified at ±5°C. That wider tolerance means the remote reading is more of a coarse over-temperature flag than a precision measurement. If the application needs better than ±5°C from the external diode, the ADM1023ARQ-REEL sibling tightens remote accuracy to ±3°C and extends the remote sensing range to 120°C. ## Package and footprint The device is supplied in a 16-lead SSOP (0.154-inch body width, 3.90 mm) and also listed with a 16-QSOP supplier device package. The two codes refer to the same physical footprint — SSOP and QSOP are interchangeable in this case — but confirm the exact package marking on your incoming inspection if the board was laid out for one variant. Mounting is surface-mount only. ## Lifecycle and sourcing The part is RoHS non-compliant per the listing, so verify your assembly's exemption status if you need lead-free processing.","metaTitle":"ADM1021ARQ Temperature Sensor, ±1°C Local / ±5°C Remote","metaDescription":"ADI ADM1021ARQ temp monitoring system: ±1°C local, ±5°C remote accuracy, SMBus output, 3V–5.5V supply, 16-SSOP/QSOP.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Bulk","Accuracy":"±1°C Local, ±5°C Remote","Function":"Temp Monitoring System (Sensor)","Topology":"ADC, Comparator, Multiplexer, Register Bank","Output Fan":"No","Output Type":"SMBus","Sensor Type":"Internal and External","Output Alarm":"Yes","Mounting Type":"Surface Mount","Package / Case":"16-SSOP (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"3V ~ 5.5V","Sensing Temperature":"0°C ~ 100°C, External Sensor","Operating Temperature":"0°C ~ 100°C","Supplier Device Package":"16-QSOP"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.5","stockQuantity":0,"priceTiers":[{"qty":201,"price":"$1.50000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/9ca7770d91e1928aedf721e2b43f8020.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Can the ADM1021ARQ be used for remote temperature sensing?","answer":"Yes — the ADM1021ARQ supports an external diode-connected transistor as a remote temperature sensor, in addition to its internal sensor. The remote channel is rated over 0°C to 100°C with an accuracy of ±5°C."},{"question":"What is the accuracy of the ADM1021ARQ temperature sensor?","answer":"The local (internal) sensor is accurate to ±1°C. The remote (external) sensor is accurate to ±5°C."},{"question":"Can ADM1021ARQ be used with a 3.3V microcontroller?","answer":"Yes — the supply range is 3V to 5.5V, so it operates directly from a 3.3V rail. The SMBus interface is compatible with 3.3V logic levels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/ADM1021ARQ","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/ADM1021ARQ 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}}