{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LD1117DTTR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LD1117DTTR","canonicalUrl":"https://icboms.com/stmicroelectronics/LD1117DTTR","factsUrl":"https://icboms.com/api/mcp/products/LD1117DTTR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LD1117DTTR, adjustable positive LDO regulator, 800 mA output, 1.2 V dropout max, 75 dB PSRR at 120 Hz, DPAK surface-mount package, 0°C to 125°C operating temperature.","salesMarkdown":"## Adjustable LDO for post-regulation — 800 mA, DPAK It delivers up to 800 mA output current with a maximum dropout voltage of 1.2 V at full load. A single internal regulator — one channel, positive output only. The 75 dB power-supply rejection ratio at 120 Hz tells you this part is designed to clean up the 100/120 Hz ripple from a full-wave rectified mains supply — common in appliance PSUs, industrial control boards, and office equipment where the raw DC rail comes from a line-frequency transformer and capacitor. Built-in over-current and over-temperature protection are included — the part folds back or shuts down rather than letting the junction run away under a sustained overload or a shorted output. ## Dropout and headroom — what the 1.2 V max means for your rail The 1.2 V dropout at 800 mA is the worst-case voltage difference between input and output needed to maintain regulation. If your input is a 5 V ±5 % rail, that is 4.75 V minimum — still above the dropout ceiling, but with only 250 mV of margin. A 5 V ±10 % rail at 4.5 V min sits right at the dropout boundary; you would need a lower-dropout part or a tighter input tolerance. The 5 mA quiescent current is the current the regulator consumes to run its internal bias — it flows to ground regardless of load. In a battery-powered design drawing microamps in sleep, 5 mA is too high; this part is sized for always-on line-powered circuits, not energy-harvesting or portable gear. ## 0°C to 125°C — indoor temperature grade only It will not start reliably below freezing — do not use it in outdoor telecom cabinets, automotive under-hood, or cold-storage applications without a heated enclosure. There is no announced end-of-life, no last-time-buy window, and no forced redesign. The DPAK package is widely stocked and the part number is a common cross-reference target.","metaTitle":"STMicroelectronics LD1117DTTR adjustable LDO, 800 mA, DPAK","metaDescription":"ST LD1117DTTR adjustable positive LDO regulator, 800 mA output, 1.2 V dropout max, 75 dB PSRR at 120 Hz. DPAK package, active production. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"STMicroelectronics","PSRR":"75dB (120Hz)","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"TO-252-3, DPak (2 Leads + Tab), SC-63","Product Status":"Active","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"800mA","Base Product Number":"LD1117","Protection Features":"Over Current, Over Temperature","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"0°C~125°C","Voltage - Input (Max)":"15V","Voltage Dropout (Max)":"1.2V @ 800mA","Voltage - Output (Max)":"15V","Supplier Device Package":"DPAK","Current - Quiescent (Iq)":"5 mA","Voltage - Output (Min/Fixed)":"1.25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.8500","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/494bb92f4effb270dec91ee8a399de6d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LD1117DTTR/alternatives.json"},"ai":{"faq":[{"question":"Is LD1117DTTR adjustable or fixed?","answer":"Adjustable. The output voltage is set by an external resistor divider from a 1.25 V internal reference, and can be adjusted up to a maximum of 15 V."},{"question":"Is LD1117DTTR equivalent to LD1117ADTTR?","answer":"The LD1117ADTTR is the 1 A output variant of the same basic regulator. The LD1117DTTR is rated for 800 mA. Both are adjustable, in the same DPAK package, and share the same pinout — but the output current ceiling differs, so they are not drop-in equivalents if your load exceeds 800 mA."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LD1117DTTR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LD1117DTTR 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}}