{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4051AEM3-1.2","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4051AEM3-1.2","canonicalUrl":"https://icboms.com/texas-instruments/LM4051AEM3-1.2","factsUrl":"https://icboms.com/api/mcp/products/LM4051AEM3-1.2","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4051AEM3-1.2 precision shunt voltage reference, fixed 1.225 V output, ±0.1% tolerance, 50ppm/°C temperature coefficient, 65 µA cathode current, SOT-23-3 package, -40°C to 125°C.","salesMarkdown":"The LM4051AEM3-1.2 is a precision shunt voltage reference from Texas Instruments, delivering a fixed 1.225 V output with a tight ±0.1% initial tolerance and a 50 ppm/°C temperature coefficient. It operates as a shunt (two-terminal) reference, meaning it regulates the voltage by shunting current away from the load — a topology that handles both positive and negative supply rails and works with a single external resistor to set the bias current. The 65 µA minimum cathode current is the quiescent floor — the reference needs at least that much current flowing into the cathode to stay in regulation. The 12 mA maximum output current sets the load ceiling; above that the shunt can't sink enough current to hold the output. In practice, the external bias resistor is sized so the total current (load + cathode) stays between 65 µA and 12 mA across all line and load conditions. ## SOT-23-3 — rework and footprint notes The LM4051AEM3-1.2 comes in a SOT-23-3 package, a three-lead surface-mount package with a 0.95 mm pitch. The shunt topology is inherently robust — no output capacitor needed for stability, and the reference can survive transient overcurrent as long as the junction temperature stays within limits. ## Obsolete — sourcing and replacement reality The LM4051AEM3-1.2 is officially obsolete. For new designs, a modern shunt reference in the same SOT-23-3 footprint with a 1.225 V output and comparable or better tolerance should be evaluated — the LM4051 family's base number suggests other tolerance grades (e.g., ±0.2%, ±0.5%) may still be active, but the A-grade ±0.1% variant is discontinued.","metaTitle":"LM4051AEM3-1.2 Shunt Voltage Reference, 1.225 V, ±0.1%","metaDescription":"LM4051AEM3-1.2 precision shunt reference, fixed 1.225 V output, ±0.1% tolerance, 50ppm/°C drift, SOT-23-3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Tolerance":"±0.1%","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-236-3, SC-59, SOT-23-3","Product Status":"Obsolete","Reference Type":"Shunt","Voltage - Input":"-","lifecycle_stage":"eol_hot","Current - Output":"12 mA","Current - Supply":"-","Current - Cathode":"65 µA","Base Product Number":"LM4051","Noise - 0.1Hz to 10Hz":"-","Noise - 10Hz to 10kHz":"20µVrms","Operating Temperature":"-40°C~125°C(TA)","Supplier Device Package":"SOT-23-3","Temperature Coefficient":"50ppm/°C","Voltage - Output (Min/Fixed)":"1.225V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.9800","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/e499b7cd54f3272232db27a8df268948.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4051AEM3-1.2/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4051AEM3-1.2","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4051AEM3-1.2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}