{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4041BELT-1.2","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LM4041BELT-1.2","canonicalUrl":"https://icboms.com/stmicroelectronics/LM4041BELT-1.2","factsUrl":"https://icboms.com/api/mcp/products/LM4041BELT-1.2","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LM4041BELT-1.2 precision shunt voltage reference, 1.225V fixed output, ±0.2% tolerance, 100ppm/°C temperature coefficient, SOT-23-3 package, -40°C to 125°C range.","salesMarkdown":"## ±0.2% tolerance — the BOM-fit decision The LM4041BELT-1.2 is a precision shunt voltage reference from STMicroelectronics, fixed at 1.225V output with a ±0.2% tolerance — the tightest bin in the LM4041 family. For a 1.225V reference, ±0.2% means the output is guaranteed within 1.222V to 1.228V over the full temperature range, which is the spec that decides whether the ADC reference or comparator threshold stays inside the system error budget without a trim pot. ## Shunt topology — resistor selection drives the BOM As a shunt reference, the LM4041BELT-1.2 behaves like a precision Zener: it requires an external series resistor from the supply to the cathode to set the bias current. The cathode current must be at least 50 µA to maintain regulation and must not exceed the 12 mA maximum output current — the resistor value is calculated from (Vsupply - 1.225V) / (Iload + 50 µA), ensuring the shunt always has enough current to sink. ## Temperature range and noise floor The 100ppm/°C temperature coefficient means the output drifts by 122.5 µV per °C — at 125°C the total drift from 25°C is about 12.25 mV, which is within the ±0.2% tolerance band. Noise is specified at 60 µVrms over 10 Hz to 10 kHz, low enough for 12-bit ADC references in noisy industrial settings.","metaTitle":"STMicroelectronics LM4041BELT-1.2 Shunt Voltage Reference","metaDescription":"STMicroelectronics LM4041BELT-1.2 precision shunt reference, 1.225V fixed output, ±0.2% tolerance, 100ppm/°C drift, -40°C to 125°C, SOT-23-3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"STMicroelectronics","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Tolerance":"±0.2%","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-236-3, SC-59, SOT-23-3","Product Status":"Active","Reference Type":"Shunt","Voltage - Input":"-","lifecycle_stage":"eol_hot","Current - Output":"12 mA","Current - Supply":"-","Current - Cathode":"50 µA","Base Product Number":"LM4041","Noise - 0.1Hz to 10Hz":"-","Noise - 10Hz to 10kHz":"60µVrms","Operating Temperature":"-40°C~125°C(TA)","Supplier Device Package":"SOT-23-3","Temperature Coefficient":"100ppm/°C","Voltage - Output (Min/Fixed)":"1.225V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.3900","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/06ccf6ae1f4c6fea187fcb5187905d18.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the tolerance of LM4041BELT-1.2?","answer":"The LM4041BELT-1.2 has a ±0.2% tolerance on the 1.225V fixed output, which is the tightest bin in the LM4041 family."},{"question":"What is the maximum cathode current for LM4041BELT-1.2?","answer":"The maximum cathode current is 12 mA, with a minimum of 50 µA required to maintain regulation."},{"question":"Is LM4041BELT-1.2 active or obsolete?","answer":"It is suitable for new designs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LM4041BELT-1.2","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LM4041BELT-1.2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T19:08:58.318Z","lastPublished":"2026-07-16T19:08:58.318Z","indexable":true}}