{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LDL1117S33R","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LDL1117S33R","canonicalUrl":"https://icboms.com/stmicroelectronics/LDL1117S33R","factsUrl":"https://icboms.com/api/mcp/products/LDL1117S33R","rawCanonicalId":null},"summary":{"shortDescription":"IC REG LINEAR 3.3V 1.2A SOT223","salesMarkdown":"The STMicroelectronics LDL1117S33R is a 3.3 V fixed-output low-dropout linear regulator rated for a full 1.2 A of output current, packaged in a four-lead SOT-223 (TO-261-4/TO-261AA). It is built as a single positive regulator and accepts an input supply up to 18 V, which gives design margin for 5 V, 9 V, or even a lightly loaded 12 V rail once headroom is checked against dropout. The maximum dropout is specified at 0.6 V at the full 1.2 A load, so a 5 V input holds regulation comfortably down to roughly 3.9 V at the input pin before the pass device starts to saturate — that margin is what makes the part forgiving in systems with loosely regulated front-end supplies or long PCB traces. Where the LDL1117 earns its place on the BOM is power-supply rejection. It holds 87 dB of PSRR at 120 Hz, decaying to 65 dB by 100 kHz, which makes it a practical choice for post-regulating a noisy DC rail ahead of audio codecs, AFE reference buffers, and mixed-signal loads sensitive to mains-frequency ripple and low-frequency switching residue. The quiescent current is 500 µA — not a battery part, but reasonable for a 1.2 A-capable LDO, and it buys a wide-bandwidth PSRR curve. Built-in protection includes over-current limiting, over-temperature shutdown, and an input under-voltage lockout, so the part is self-protecting across the specified -40 °C to 125 °C junction-temperature range. When you select it, confirm the SOT-223 copper area can handle 1.2 A continuous load and verify the input-to-output dropout budget across your operating corners; with a fixed 3.3 V output, a 0.6 V dropout envelope, and an 18 V absolute input limit, it is a drop-in-capable workhorse for the 5 V-to-3.3 V rail that needs quiet output at real current.","metaTitle":"LDL1117S33R LDO 3.3V 1.2A SOT-223 — STMicroelectronics | ICBOMS","metaDescription":"STMicro LDL1117S33R LDO regulator 3.3 V 1.2 A SOT-223 −40 to 125 °C. Get a quote from ICBOMS Shenzhen sourcing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":[],"specifications":{"PSRR":"87dB ~ 65dB (120Hz ~ 100kHz)","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-261-4, TO-261AA","lifecycle_stage":"eol_hot","Current - Output":"1.2A","Protection Features":"Over Current, Over Temperature, Under Voltage Lockout (UVLO)","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C (TJ)","Voltage - Input (Max)":"18V","Voltage Dropout (Max)":"0.6V @ 1.2A","Supplier Device Package":"SOT-223","Current - Quiescent (Iq)":"500 µA","Voltage - Output (Min/Fixed)":"3.3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.58242","priceTiers":[{"qty":1,"price":"$0.58242","currency":"USD"},{"qty":10,"price":"$0.49036","currency":"USD"},{"qty":30,"price":"$0.42465","currency":"USD"},{"qty":100,"price":"$0.37021","currency":"USD"},{"qty":500,"price":"$0.35330","currency":"USD"},{"qty":1000,"price":"$0.34202","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LDL1117S33R/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LDL1117S33R","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LDL1117S33R when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-13T15:26:53.526Z","lastPublished":"2026-08-13T15:26:53.526Z","indexable":true}}