{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LD1117F33C","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LD1117F33C","canonicalUrl":"https://icboms.com/stmicroelectronics/LD1117F33C","factsUrl":"https://icboms.com/api/mcp/products/LD1117F33C","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LD1117F33C, fixed 3.3V LDO voltage regulator, 800mA output, 1.3V dropout max, 75dB PSRR at 120Hz, TO-220-3 through-hole package, -40°C to 125°C.","salesMarkdown":"## Fixed 3.3 V rail, 800 mA — the LDO for moderate loads The STMicroelectronics LD1117F33C is a fixed 3.3 V output low-dropout regulator rated for 800 mA continuous output. Dropout voltage maxes at 1.3 V at full load. The single positive regulator includes over-current and over-temperature protection, and quiescent current runs 10 mA typical. ## 75 dB PSRR — ripple rejection on the mains-derived rail Power-supply rejection ratio is 75 dB at 120 Hz, which is the fundamental ripple frequency from a full-wave rectified 60 Hz line. That level of rejection attenuates a 1 Vpp ripple on the input to under 0.2 mVpp at the output — useful for powering analog stages or noise-sensitive loads fed from an unregulated bulk supply. ## Industrial temperature range, TO-220 through-hole The TO-220-3 package with a metal tab can be bolted to a heatsink or chassis — the tab is the output terminal, so the heatsink path is electrically live and must be isolated or accounted for in the layout. ## Obsolete — sourcing reality and the replacement path No official successor is listed on the record. For new designs or volume production, the LD1117 series includes adjustable-output variants and other fixed voltages in the same TO-220 footprint; the base product number LD1118 family may offer a current-production alternative, but pin compatibility and dropout specs should be verified against the specific application.","metaTitle":"ST LD1117F33C LDO Voltage Regulator, 3.3V Fixed, 800mA","metaDescription":"STMicroelectronics LD1117F33C fixed 3.3V LDO, 800mA output, 1.3V dropout max, 75dB PSRR at 120Hz. TO-220-3, -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":"Through Hole","Package / Case":"TO-220-3","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":"TO-220","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"3.3V"}},"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/LD1117F33C/alternatives.json"},"ai":{"faq":[{"question":"Is LD1117F33C compatible with LD1117V33?","answer":"Both parts share the LD1117 base number and a fixed 3.3 V output, but the suffix indicates different packages — the F33C is TO-220-3, while the V33 is typically in a different package (e.g., SOT-223). They are not pin-compatible without a board change. Verify the package and footprint before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LD1117F33C","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LD1117F33C 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}}