{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LD1117DT18C","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LD1117DT18C","canonicalUrl":"https://icboms.com/stmicroelectronics/LD1117DT18C","factsUrl":"https://icboms.com/api/mcp/products/LD1117DT18C","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LD1117DT18C, fixed-output LDO, 1.8V, 800mA, 1.3V dropout max, 75dB PSRR at 120Hz, DPAK surface-mount, -40°C to 125°C.","salesMarkdown":"The LD1117DT18C is officially obsolete per the manufacturer lifecycle record. ## Fixed 1.8V output, 800mA capacity This is a single-output positive LDO regulator from ST's LD1117 family, providing a fixed 1.8V rail at up to 800mA continuous output. Maximum dropout voltage is 1.3V at full load, meaning the input rail must stay above 3.1V to maintain regulation — a key headroom check for 3.3V or 5V bus-derived supplies. Quiescent current is 10 mA typical; this is not a low-Iq part for battery-standby designs but is acceptable for always-on board-level regulation where the load current dominates the power budget. ## PSRR and protection features Power supply rejection ratio is 75 dB at 120 Hz, providing effective ripple attenuation on rectified line-frequency supplies — relevant for industrial or audio-stage pre-regulation where the input bus carries residual mains hum. Built-in over-current and over-temperature protection allow the regulator to survive output shorts or thermal overload without external clamp diodes. ## DPAK package and temperature grade The tab is the output terminal — layout must connect it to the output rail with adequate copper area for thermal dissipation at 800 mA.","metaTitle":"LD1117DT18C LDO Regulator, 1.8V Fixed, 800mA, DPAK","metaDescription":"STMicroelectronics LD1117DT18C LDO, fixed 1.8V output, 800mA, 75dB PSRR at 120Hz. DPAK package, -40°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":"Tube","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":"-40°C~125°C","Voltage - Input (Max)":"15V","Voltage Dropout (Max)":"1.3V @ 800mA","Voltage - Output (Max)":"-","Supplier Device Package":"DPAK","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/LD1117DT18C/alternatives.json"},"ai":{"faq":[{"question":"Is LD1117DT18C obsolete?","answer":"Yes, the manufacturer has marked the LD1117DT18C as obsolete. No official successor is listed."},{"question":"What package is the LD1117DT18C?","answer":"It is supplied in a TO-252-3 DPAK surface-mount package, also referred to as DPAK or SC-63."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LD1117DT18C","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LD1117DT18C 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}}