{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317MQDCYR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM317MQDCYR","canonicalUrl":"https://icboms.com/texas-instruments/LM317MQDCYR","factsUrl":"https://icboms.com/api/mcp/products/LM317MQDCYR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM317 series adjustable positive voltage regulator, order code LM317MQDCYR, 500 mA output, 1.25 V to 37 V adjustable output, PSRR 80 dB to 65 dB at 120 Hz, -40°C to 125°C junction temperature, SOT-223-4 surface-mount package.","salesMarkdown":"## 500 mA adjustable regulator in SOT-223-4 — what the PSRR number tells you The LM317MQDCYR is a positive adjustable voltage regulator from the LM317 family, delivering up to 500 mA output current from a 1.25 V to 37 V adjustable output range. The PSRR of 80 dB to 65 dB at 120 Hz attenuates ripple from a full-wave rectified mains supply — critical when the regulator feeds noise-sensitive analog loads like an ADC reference or an op-amp rail. ## Industrial temperature grade and protection On-chip protection includes over-current limiting, thermal shutdown, and short-circuit current foldback — the regulator survives a sustained output short without external crowbar circuitry. Housed in a TO-261-4 (SOT-223-4) surface-mount package, the LM317MQDCYR has a 0.50 mm pitch between the three signal leads and the large tab. A 2-layer board with a 1-inch-square copper pour on the tab gives adequate derating for 500 mA at 85°C ambient; thinner copper or smaller pads will force a lower current ceiling.","metaTitle":"LM317MQDCYR Adjustable Positive Regulator, 500 mA, SOT-223-4","metaDescription":"Texas Instruments LM317MQDCYR adjustable positive voltage regulator, 1.25 V to 37 V output, 500 mA, PSRR 80 dB at 120 Hz, -40°C to 125°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","PSRR":"80dB ~ 65dB (120Hz)","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"TO-261-4, TO-261AA","Product Status":"Active","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"500mA","Base Product Number":"LM317","Protection Features":"Over Current, Over Temperature, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C~125°C(TJ)","Voltage - Input (Max)":"40V","Voltage Dropout (Max)":"-","Voltage - Output (Max)":"37V","Supplier Device Package":"SOT-223-4","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"1.25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7200","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/8add0f5d520bdac069fa89d976dea0aa.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317MQDCYR/alternatives.json"},"ai":{"faq":[{"question":"Can LM317MQDCYR replace LM317LD?","answer":"Both are adjustable positive regulators from the LM317 family, but the LM317LD is in a different package (SOIC-8). Pin compatibility depends on the specific board layout — the SOT-223-4 footprint has a different tab connection than the SOIC-8. Confirm the pad layout before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM317MQDCYR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM317MQDCYR 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}}