{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LD1117S28TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LD1117S28TR","canonicalUrl":"https://icboms.com/stmicroelectronics/LD1117S28TR","factsUrl":"https://icboms.com/api/mcp/products/LD1117S28TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LD1117S28TR, fixed 2.85 V LDO regulator, 800 mA output, 75 dB PSRR at 120 Hz, over-current and over-temperature protection, SOT-223 package, obsolete.","salesMarkdown":"## Fixed 2.85 V rail, 800 mA — obsolete but still on the shelf The STMicroelectronics LD1117S28TR is a fixed-output positive LDO regulator delivering 2.85 V at up to 800 mA. It is part of the LD1117 family, a workhorse low-dropout series used in post-regulation and local rail conditioning for mixed-signal boards, set-top boxes, and industrial control modules where a clean 2.85 V supply is needed. A PSRR of 75 dB at 120 Hz attenuates full-wave-rectified ripple. ## Protection built in — over-current and over-temperature The LD1117S28TR integrates over-current and over-temperature protection, so a sustained output short or a high ambient temperature triggers thermal shutdown rather than letting the die exceed its safe operating area. This reduces the need for external supervisory circuitry in fault-prone environments like motor-adjacent boards or outdoor telecom modules. ## Sourcing reality — obsolete, sourced to order","metaTitle":"STMicroelectronics LD1117S28TR LDO Regulator, Fixed 2.85 V","metaDescription":"ST LD1117S28TR fixed 2.85 V LDO regulator, 800 mA output, 75 dB PSRR at 120 Hz. SOT-223 package.","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":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-261-4, TO-261AA","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":"SOT-223","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"2.85V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.3000","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/494bb92f4effb270dec91ee8a399de6d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LD1117S28TR/alternatives.json"},"ai":{"faq":[{"question":"Does LD1117S28TR have over current protection?","answer":"Yes, it includes over-current and over-temperature protection features."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LD1117S28TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LD1117S28TR 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}}