{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317DCYG3","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM317DCYG3","canonicalUrl":"https://icboms.com/texas-instruments/LM317DCYG3","factsUrl":"https://icboms.com/api/mcp/products/LM317DCYG3","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM317 series adjustable positive voltage regulator, LM317DCYG3, 1.5 A output, 40 V input max, 1.25 V to 37 V adjustable output, SOT-223-4 surface-mount package, tube.","salesMarkdown":"## Wide-range adjustable LDO in a compact surface-mount package The LM317DCYG3 is the classic three-terminal adjustable positive voltage regulator from Texas Instruments, delivering up to 1.5 A continuous output from a 40 V max input rail, adjustable from 1.25 V to 37 V via two external resistors. Housed in a SOT-223-4 surface-mount package, it offers a compact footprint for designs where the traditional TO-220 through-hole version is too tall or incompatible with automated assembly. The 10 mA quiescent current is a trade-off for the wide input range and built-in protection — not a low-Iq choice for battery gear, but fine for industrial rails where the load current dwarfs the regulator's own draw. ## PSRR and protection — what the numbers mean for your rail PSRR is 64 dB typical at 120 Hz, dropping to 57 dB — this is the line ripple rejection from a full-wave rectifier's 120 Hz hum. It cleans up a bulk-capacitor filtered rail well enough for op-amp supplies or logic, but a noise-sensitive ADC front-end would need a post-filter or a higher-PSRR LDO. Built-in over-current, over-temperature, and short-circuit protection mean the regulator survives a momentary output short without external foldback circuitry — the thermal shutdown cycles the output until the fault clears. Operating temperature range is 0°C to 125°C — industrial ambient up to 85°C is fine, but the junction-to-ambient thermal resistance of the SOT-223-4 (typically 62°C/W with 1 in² copper) limits the continuous current at high ambient; derate accordingly. Sourced through authorized distribution channels; volume pricing and lead time confirmed at RFQ against your BOM quantity.","metaTitle":"Texas Instruments LM317DCYG3 Adjustable LDO, 1.5 A","metaDescription":"Texas Instruments LM317DCYG3 adjustable positive voltage regulator, 1.5 A output, 40 V input max, PSRR 64 dB at 120 Hz. Active production, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","PSRR":"64dB ~ 57dB (120Hz)","Series":"-","Package":"Tube","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":"1.5A","Base Product Number":"LM317","Protection Features":"Over Current, Over Temperature, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"0°C~125°C","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":"$1.3400","priceTiers":[{"qty":1,"price":"$1.34000","currency":"USD"},{"qty":10,"price":"$1.19800","currency":"USD"},{"qty":80,"price":"$0.93388","currency":"USD"},{"qty":320,"price":"$0.87294","currency":"USD"},{"qty":560,"price":"$0.77145","currency":"USD"},{"qty":1040,"price":"$0.60903","currency":"USD"},{"qty":2560,"price":"$0.56843","currency":"USD"},{"qty":5040,"price":"$0.54001","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/6e4aef63b3328a11f0a16987811b26d6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317DCYG3/alternatives.json"},"ai":{"faq":[{"question":"What is the PSRR of LM317DCYG3?","answer":"PSRR is 64 dB typical at 120 Hz, dropping to 57 dB — adequate for rejecting full-wave rectifier ripple in general-purpose analog or logic rails, but not sufficient for noise-sensitive RF or precision ADC supplies without additional filtering."},{"question":"Will LM317DCYG3 drop into a board designed for LM1085IS-ADJ/NOPB?","answer":"Not without a board spin. The LM1085IS-ADJ/NOPB is a 3 A adjustable regulator in a TO-263 package, while the LM317DCYG3 is a 1.5 A part in a smaller SOT-223-4 footprint. The pinout is similar (adj, output, input) but the pad geometry and thermal management differ — the LM1085's larger tab requires a different copper area."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM317DCYG3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM317DCYG3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}