{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LD1117D18","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LD1117D18","canonicalUrl":"https://icboms.com/stmicroelectronics/LD1117D18","factsUrl":"https://icboms.com/api/mcp/products/LD1117D18","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LD1117D18, positive fixed LDO regulator, 1.8V output, 800mA, 75dB PSRR at 120Hz, dropout 1.2V max at 800mA, 8-SOIC package, 0°C to 125°C.","salesMarkdown":"## Fixed 1.8 V rail, 800 mA capacity The STMicroelectronics LD1117D18 is a single-output positive fixed LDO regulator delivering a regulated 1.8 V output at up to 800 mA. Maximum dropout voltage is 1.2 V at the full 800 mA load, so the input rail must stay above 3.0 V to maintain regulation. ## Protection and quiescent draw Built-in over-current and over-temperature protection cover the usual fault conditions. For new designs or BOM sustainment, a pin-compatible fixed 1.8 V LDO in the same 8-SOIC footprint from the LD1117 family is the natural cross-reference — confirm the dropout and current rating match the application.","metaTitle":"ST LD1117D18 LDO Regulator, 1.8V Fixed, 800mA, 8-SOIC","metaDescription":"STMicroelectronics LD1117D18 positive fixed LDO, 1.8V output, 800mA, 75dB PSRR at 120Hz.","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":"Tube","Output Type":"Fixed","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)":"-","Supplier Device Package":"8-SOIC","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"1.8V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/494bb92f4effb270dec91ee8a399de6d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LD1117D18/alternatives.json"},"ai":{"faq":[{"question":"Is the LD1117D18 obsolete?","answer":"Yes, STMicroelectronics lists the LD1117D18 as obsolete."},{"question":"What is the LD1117D18's PSRR?","answer":"The LD1117D18 provides 75 dB of power-supply rejection at 120 Hz, which is the typical line-frequency ripple frequency. This makes it suitable for noise-sensitive analog loads powered from a rectified AC source."},{"question":"Can the LD1117D18 be used for a 3.3 V output?","answer":"No — the LD1117D18 is a fixed 1.8 V output regulator. For a 3.3 V rail, you would need the fixed 3.3 V variant in the same LD1117 family (e.g., LD1117D33) or an adjustable version with external resistors."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LD1117D18","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LD1117D18 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}}