{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM81BIMT-3/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM81BIMT-3-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM81BIMT-3-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM81BIMT-3%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM81BIMT-3/NOPB hardware monitor IC, ±3°C max accuracy, internal and external sensor, 2-wire SMBus output, fan control and alarm, 24-TSSOP package, tube.","salesMarkdown":"## 24-TSSOP footprint and board integration The LM81BIMT-3/NOPB: The tube delivery means the ICs are shipped in antistatic tubes, not tape-and-reel — factor this into pick-and-place feeder setup if your line expects reeled parts. ## What ±3°C max accuracy means for your thermal monitoring For a system that needs to trigger a fan or an alarm at a specific temperature threshold, this tolerance means the actual trip point can be up to 3°C away from the programmed value. If your thermal budget requires tighter control — say, ±1°C at a critical junction — you may need to calibrate the remote diode path or select a higher-grade monitor. For most equipment monitoring (server racks, power supplies, industrial controllers), ±3°C is adequate to prevent thermal runaway without nuisance alarms. ## Active production — no end-of-life concern Texas Instruments lists the LM81BIMT-3/NOPB with a lifecycle stage of 'current' and an official product status of 'Active'. The part is ROHS3 compliant, so it meets the EU RoHS directive without exemption. ## Internal architecture: ADC, comparator, fan control, register bank The LM81BIMT-3/NOPB integrates a sigma-delta ADC, a comparator, fan speed control logic, and a register bank. The sigma-delta ADC converts the analog voltage from the internal temperature sensor and the external diode-connected transistor into a digital value. The comparator checks the converted temperature against programmable limit registers and asserts the ALERT output if a limit is exceeded. The fan speed control block generates a PWM or linear output to drive a cooling fan based on the temperature reading — this closes the loop without host processor intervention. The register bank is accessed over the 2-wire SMBus for configuration and readback. ## Supply rail and operating range This covers most equipment environments except extended military or downhole applications.","metaTitle":"LM81BIMT-3/NOPB Texas Instruments Hardware Monitor, ±3°C","metaDescription":"Texas Instruments LM81BIMT-3/NOPB hardware monitor IC, ±3°C max accuracy, internal/external sensor, 2-wire SMBus, 24-TSSOP. Active production, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tube","Accuracy":"±3°C(Max)","Function":"Hardware Monitor","Topology":"ADC (Sigma Delta), Comparator, Fan Speed Control, Register Bank","Output Fan":"Yes","Output Type":"2-Wire SMBus","Sensor Type":"Internal and External","Output Alarm":"Yes","Mounting Type":"Surface Mount","Package / Case":"24-TSSOP (0.173\\\", 4.40mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"2.8V ~ 3.8V","Sensing Temperature":"-40°C ~ 125°C","Operating Temperature":"-40°C ~ 125°C","Supplier Device Package":"24-TSSOP"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.92","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$6.92000","currency":"USD"},{"qty":10,"price":"$6.21400","currency":"USD"},{"qty":25,"price":"$5.87440","currency":"USD"},{"qty":100,"price":"$5.09100","currency":"USD"},{"qty":250,"price":"$4.82996","currency":"USD"},{"qty":500,"price":"$4.33390","currency":"USD"},{"qty":1000,"price":"$3.69450","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/28737d4cf29e41f7d9007dc27dc8ba03.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the LM81BIMT-3/NOPB's temperature accuracy and what does it mean for my system?","answer":"This is the total error including the internal sensor and ADC. For thermal monitoring in servers, power supplies, or industrial controllers, this tolerance is sufficient to prevent thermal runaway. If your application requires tighter accuracy (e.g., ±1°C), you may need to calibrate the remote diode path or select a higher-grade monitor."},{"question":"What compliance documentation does Texas Instruments provide for LM81BIMT-3/NOPB?","answer":"Texas Instruments provides a RoHS certificate and material declaration."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM81BIMT-3-NOPB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM81BIMT-3-NOPB 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}}