{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040BIM3-2.0","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040BIM3-2.0","canonicalUrl":"https://icboms.com/texas-instruments/LM4040BIM3-2.0","factsUrl":"https://icboms.com/api/mcp/products/LM4040BIM3-2.0","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040 series precision shunt voltage reference, LM4040BIM3-2.0, fixed 2.048V output, ±0.2% tolerance, 100 ppm/°C, 35 µVrms noise, SOT-23-3 surface mount, industrial temperature range.","salesMarkdown":"The LM4040BIM3-2.0 is a precision shunt voltage reference from Texas Instruments' LM4040 family, delivering a fixed 2.048V output with ±0.2% initial tolerance. This is the voltage a 12-bit ADC with a 2.048V reference input sees as its full-scale — every millivolt of error at the reference directly shifts the conversion result by about half an LSB. As a shunt reference, it behaves like a precision Zener diode: it regulates the output voltage by shunting current through the cathode to ground, requiring a series resistor from the supply. The minimum cathode current is 65 µA, and the maximum output current is 15 mA — the resistor value must be chosen so the current through the reference stays within this window across load and supply variations. ## Temperature drift and noise — the accuracy budget For a 12-bit system with a 2.048V reference, that drift consumes about 0.1 LSB — acceptable. For a 16-bit system, the same drift eats roughly 1.6 LSBs, so this part is marginal for 16-bit precision without calibration. Wideband noise is specified at 35 µVrms over 10 Hz to 10 kHz. In a slow-sampling ADC (below 100 SPS), this noise can be averaged out; in a fast SAR ADC sampling at 1 MSPS, the noise bandwidth overlaps the conversion window and may degrade the effective resolution by 1–2 bits unless the reference output is filtered. The SOT-23-3 package (TO-236-3, SC-59 equivalent) is a common footprint shared across the LM4040 family. If your BOM calls for the 'BIM3' grade (B = ±0.2% tolerance, I = industrial temperature, M3 = SOT-23-3), the 'AIM3' grade (A = ±0.1% tolerance) is a drop-in replacement with tighter initial accuracy — but it carries the same obsolete status.","metaTitle":"LM4040BIM3-2.0 Shunt Voltage Reference, 2.048V ±0.2%","metaDescription":"LM4040BIM3-2.0 precision shunt reference, 2.048V fixed output, ±0.2% tolerance, 100 ppm/°C drift, 35 µVrms noise, 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":"±0.2%","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":"15 mA","Current - Supply":"-","Current - Cathode":"65 µA","Base Product Number":"LM4040","Noise - 0.1Hz to 10Hz":"-","Noise - 10Hz to 10kHz":"35µVrms","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"SOT-23-3","Temperature Coefficient":"100ppm/°C","Voltage - Output (Min/Fixed)":"2.048V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/8c40cf163b5cda64fd88ad5c9f25fe6d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040BIM3-2.0/alternatives.json"},"ai":{"faq":[{"question":"What is the replacement for LM4040BIM3-2.0?","answer":"The LM4040 family includes other voltage options (1.225V, 2.5V, 4.096V, 5V, 10V) and tolerance grades (A = ±0.1%, C = ±0.5%, D = ±1%, E = ±2%), but none is listed as a direct replacement for the 2.048V BIM3 variant. A pin-compatible alternative within the family would need to match the 2.048V fixed output, SOT-23-3 package, and shunt topology — verify the tolerance and temperature coefficient against your BOM requirements."},{"question":"What is the difference between LM4040BIM3-2.0 and LM4040AIM3-2.0?","answer":"The difference is initial output tolerance. The 'B' grade (LM4040BIM3-2.0) specifies ±0.2% tolerance, while the 'A' grade (LM4040AIM3-2.0) specifies ±0.1% tolerance. Both share the same 2.048V fixed output, SOT-23-3 package, industrial temperature range, and obsolete lifecycle status. The 'A' grade is a tighter-tolerance drop-in replacement if your system accuracy budget requires it."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040BIM3-2.0","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040BIM3-2.0 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}}