{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LD1117DT28TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LD1117DT28TR","canonicalUrl":"https://icboms.com/stmicroelectronics/LD1117DT28TR","factsUrl":"https://icboms.com/api/mcp/products/LD1117DT28TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LD1117DT28TR, positive fixed LDO regulator, 2.85V output, 800mA current, 1.2V dropout max, 75dB PSRR at 120Hz, DPAK surface-mount package, 0°C to 125°C operating range.","salesMarkdown":"## Fixed 2.85 V rail for legacy designs The STMicroelectronics LD1117DT28TR is a single-output positive fixed LDO regulator delivering 2.85 V at up to 800 mA. It comes in a DPAK (TO-252-3) surface-mount package and operates over 0°C to 125°C — a commercial-to-hot range suited for indoor power supplies and industrial control boards that need a clean 2.85 V rail from a 15 V max input. ## Dropout voltage and thermal budget at 800 mA Maximum dropout is 1.2 V at the full 800 mA load. At 2.85 V output that requires at least 4.05 V input to stay in regulation — a 3.3 V rail is too low; plan for a 5 V or higher pre-regulator rail. ## Obsolete — sourcing from the aftermarket channel Expect to work with broker or surplus stock; verify date-code freshness and moisture sensitivity before reflow.","metaTitle":"STMicroelectronics LD1117DT28TR LDO Regulator","metaDescription":"ST LD1117DT28TR positive fixed LDO, 2.85V output, 800mA, 1.2V dropout max, 75dB PSRR at 120Hz. DPAK package, 0°C to 125°C.","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) Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-252-3, DPak (2 Leads + Tab), SC-63","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":"DPAK","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"2.85V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.5500","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/494bb92f4effb270dec91ee8a399de6d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LD1117DT28TR/alternatives.json"},"ai":{"faq":[{"question":"What can replace LD1117DT28TR?","answer":"A pin-compatible alternative within the LD1117 family would need to match the DPAK footprint, fixed 2.85 V output, and 800 mA capability. Check the base product number LD1117 for other fixed-voltage variants or adjustable versions that can be set to 2.85 V with external resistors."},{"question":"Does LD1117DT28TR require a heatsink?","answer":"At 800 mA with 1.2 V dropout, the device dissipates nearly 1 W."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LD1117DT28TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LD1117DT28TR 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}}