{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LD1117D25","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LD1117D25","canonicalUrl":"https://icboms.com/stmicroelectronics/LD1117D25","factsUrl":"https://icboms.com/api/mcp/products/LD1117D25","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LD1117D25, fixed 2.5V output LDO, 800mA, 1.2V dropout max, 75dB PSRR at 120Hz, 8-SOIC surface mount, 0°C to 125°C operating range.","salesMarkdown":"## Fixed 2.5 V rail — the output that defines the BOM position The STMicroelectronics LD1117D25 is a single-output, positive-voltage LDO regulator that delivers a fixed 2.5 V output at up to 800 mA. It comes in an 8-SOIC narrow-body surface-mount package, with a maximum dropout voltage of 1.2 V at full load. The 75 dB PSRR at 120 Hz is the figure that matters when this regulator sits downstream of a full-wave rectifier — it tells you how much 120 Hz ripple the regulator attenuates before it reaches the 2.5 V rail. ## Dropout headroom and load budget — sizing the input rail At 800 mA the dropout voltage can reach 1.2 V maximum, meaning the input must stay above 3.7 V to keep the 2.5 V output in regulation. The quiescent current is 10 mA — this is the current the regulator burns just to run, and it adds to the total load on the upstream supply. Protection features include over-current and over-temperature shutdown, which guard against a shorted output or a thermal runaway condition on a crowded board. No official successor part is listed on the ST record for this exact order code, so a buyer evaluating a replacement should look at the broader LD1117 family for a pin-compatible fixed 2.5 V variant in the same 8-SOIC package. ## Operating range and environment The maximum input voltage is 15 V, so the part can run from a 12 V bus or a 9 V battery rail with headroom to spare. The 8-SOIC supplier device package uses the standard narrow-body footprint — the copper area on the PCB under the die pad sets the effective thermal resistance.","metaTitle":"LD1117D25 STMicroelectronics LDO Regulator, 2.5V Fixed","metaDescription":"ST LD1117D25 fixed 2.5V LDO, 800mA output, 1.2V dropout, 75dB PSRR at 120Hz. 8-SOIC. Datasheet and replacement info.","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)":"2.5V"}},"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/LD1117D25/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LD1117D25","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LD1117D25 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}}