{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LD1117DTR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LD1117DTR","canonicalUrl":"https://icboms.com/stmicroelectronics/LD1117DTR","factsUrl":"https://icboms.com/api/mcp/products/LD1117DTR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LD1117DTR adjustable positive LDO regulator, 800 mA output, 75 dB PSRR at 120 Hz, 1.2 V max dropout at full load, 0°C to 125°C, 8-SOIC surface-mount package.","salesMarkdown":"## LD1117DTR — adjustable LDO in 8-SOIC, now obsolete The STMicroelectronics LD1117DTR is an adjustable positive low-dropout voltage regulator delivering up to 800 mA. It comes in an 8-SOIC surface-mount package — a standard footprint that places cleanly on a pick-and-place line without special handling. Key protection features include over-current and over-temperature shutdown. The quiescent current is 5 mA, typical for a general-purpose LDO of this output class. The LD1117DTR provides 75 dB ripple rejection at 120 Hz. The 1.2 V maximum dropout at 800 mA means the input must stay at least 1.2 V above the programmed output voltage at full load. For new designs, ST recommends evaluating current-production LDOs in the LD1117 family or a comparable adjustable LDO from another vendor. The 8-SOIC package is standard and the adjustable output topology is widely second-sourced, so a pin-compatible alternate from another manufacturer is a practical option for dual-sourcing.","metaTitle":"LD1117DTR Adjustable LDO Regulator, 800 mA, 75 dB PSRR","metaDescription":"STMicroelectronics LD1117DTR adjustable positive LDO regulator. 800 mA output, 75 dB PSRR at 120 Hz, dropout 1.2 V max.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"STMicroelectronics","PSRR":"75dB (120Hz)","Series":"-","Package":"Tape & Reel (TR)","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Obsolete","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":"8-SOIC","Current - Quiescent (Iq)":"5 mA","Voltage - Output (Min/Fixed)":"1.25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7090","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/494bb92f4effb270dec91ee8a399de6d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LD1117DTR/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to LD1117DTR?","answer":"No official pin-compatible cross-reference is recorded for the LD1117DTR. The adjustable LDO topology and 8-SOIC footprint are industry-standard, so many adjustable LDOs in SOIC-8 from other manufacturers are potential drop-in candidates — confirm the pinout and compensation scheme against your specific BOM before committing."},{"question":"Is LD1117DTR compatible with 3.3 V output?","answer":"Yes, the LD1117DTR is an adjustable regulator. A 3.3 V output is set by the external resistor divider per the standard formula Vout = 1.25 V × (1 + R2/R1). The 1.25 V reference and 15 V input maximum cover the 3.3 V output comfortably, provided the input voltage stays above the dropout ceiling of 1.2 V plus the output voltage."},{"question":"What is LD1117DTR's listed PSRR?","answer":"The LD1117DTR is specified for 75 dB ripple rejection at 120 Hz. This is the typical line-frequency rejection performance for a general-purpose LDO of this class."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LD1117DTR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LD1117DTR 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}}