{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LD1117DT33","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LD1117DT33","canonicalUrl":"https://icboms.com/stmicroelectronics/LD1117DT33","factsUrl":"https://icboms.com/api/mcp/products/LD1117DT33","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LD1117 series, LD1117DT33 positive fixed 3.3V LDO regulator, 800mA output, 1.2V dropout max, 75dB PSRR at 120Hz, DPAK surface-mount package, 0°C to 125°C operating temperature.","salesMarkdown":"## Fixed 3.3 V rail in a DPAK — what this LDO delivers The STMicroelectronics LD1117DT33 is a positive fixed-output LDO regulator delivering 3.3 V at up to 800 mA from a maximum input of 15 V. The output is fixed — no external resistor divider needed — and the single regulator channel is protected against over-current and over-temperature events. The maximum dropout voltage is 1.2 V at the full 800 mA load. That means the input rail must stay above 4.5 V to maintain regulation at the output — a 3.3 V rail from a 5 V supply has 1.7 V of headroom, which is comfortable. If the input dips below 4.5 V under load, the output follows it down. PSRR is 75 dB at 120 Hz, which is the typical rectified line-frequency ripple. That level of rejection cleans up the 120 Hz hum from a mains-derived supply. The LD1117DT33 is listed as Obsolete. STMicroelectronics no longer manufactures it in volume. ## Sourcing posture — how to get this part today Because the part is obsolete, it is not available through the factory or franchised distributors in new-production quantities. No stock-holding claim; every lot is verified before shipment.","metaTitle":"STMicroelectronics LD1117DT33 LDO Regulator, 3.3V Fixed","metaDescription":"ST LD1117DT33 positive fixed 3.3V LDO, 800mA output, 1.2V dropout max, 75dB PSRR at 120Hz. DPAK surface mount.","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":"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)":"3.3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6400","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/494bb92f4effb270dec91ee8a399de6d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LD1117DT33/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between the LD1117DT33 and the LD1117DT50?","answer":"The only difference is the fixed output voltage: the LD1117DT33 outputs 3.3 V, while the LD1117DT50 outputs 5.0 V. Both are in the same DPAK package, same 800 mA current rating, same dropout and protection features. The pinout is identical — they are drop-in replacements for each other on the board if the output voltage matches your rail requirement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LD1117DT33","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LD1117DT33 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}}