{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317MDCYR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM317MDCYR","canonicalUrl":"https://icboms.com/texas-instruments/LM317MDCYR","factsUrl":"https://icboms.com/api/mcp/products/LM317MDCYR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM317MDCYR, adjustable positive voltage regulator, 500 mA output, 40 V input max, 1.25 V to 37 V output, PSRR 80 dB ~ 65 dB at 120 Hz, SOT-223-4, -40°C to 125°C.","salesMarkdown":"## 40 V input ceiling sets the supply headroom Its 40 V maximum input and 500 mA output cover the common ground for powering analog rails, sensor supplies, and low-power logic from unregulated or semi-regulated DC buses. Output adjusts from 1.25 V up to 37 V with two external resistors — the classic LM317 topology. Single regulator, positive output configuration. ## Ripple rejection at line frequency PSRR is specified at 80 dB to 65 dB at 120 Hz. That 65 dB floor is the design-in number for a 60 Hz full-wave rectified supply — it tells you how much 120 Hz ripple bleeds through to the output. For a clean 5 V analog rail, that is still about 1.8 mV ripple from a 1 Vpp input ripple, which is acceptable for most 12-bit ADC references but marginal for a 16-bit precision chain. ## SOT-223-4 — rework and thermal reality The SOT-223-4 package (TO-261-4 equivalent) is surface-mount with a large centre tab. The tab is the thermal path and the output pin — it needs a solid copper pour and vias to the ground plane to keep junction temperature under 125°C at 500 mA with a moderate input-output differential. ## Protection features and quiescent current Built-in over-current, over-temperature, and short-circuit protection. Quiescent current is 10 mA typical — not a low-Iq part, so not for battery-powered always-on rails, but fine for line-powered industrial and automotive circuits.","metaTitle":"LM317MDCYR Adjustable Regulator, 500 mA, SOT-223-4, Active","metaDescription":"LM317MDCYR adjustable positive voltage regulator, 500 mA output, 40 V input max, PSRR 80 dB ~ 65 dB at 120 Hz, SOT-223-4 package, active lifecycle.","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":"$0.6600","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/8add0f5d520bdac069fa89d976dea0aa.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317MDCYR/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM317MDCYR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM317MDCYR 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}}