{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LD1117V33C","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LD1117V33C","canonicalUrl":"https://icboms.com/stmicroelectronics/LD1117V33C","factsUrl":"https://icboms.com/api/mcp/products/LD1117V33C","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LD1117V33C, a fixed 3.3 V output LDO in TO-220-3, rated 800 mA continuous with a 1.3 V max dropout at full load and 75 dB PSRR at 120 Hz.","salesMarkdown":"## 3.3 V fixed rail, 800 mA — what the dropout tells you The LD1117V33C is a single-output positive LDO from STMicroelectronics, fixed at 3.3 V output with an 800 mA current rating. The 1.3 V maximum dropout at 800 mA means the input must stay above 4.6 V to regulate — a 5 V rail with 10 % tolerance (4.5 V min) is borderline; a 5 V rail with 5 % tolerance (4.75 V min) clears the headroom with 150 mV to spare. Below that, the output tracks the input minus dropout, and ripple rejection collapses. That attenuation knocks a 1 Vpp ripple down to about 180 µVpp at the output — clean enough for most analog loads, but if the load draws 800 mA the dropout rises and the PSRR curve shifts; the datasheet's PSRR-vs-frequency plot (not reproduced here) should be checked against your ripple spectrum. ## Industrial temperature grade and protection The TO-220-3 package with its exposed metal tab allows bolting to a heatsink; at 800 mA and 1.3 V dropout the dissipation is 1.04 W, which in still air at 25°C needs a heatsink to keep junction below 125°C. Built-in over-current and over-temperature protection means the part folds back rather than failing short — a useful behaviour for a rail that powers an MCU or sensor cluster where a hard short could damage downstream circuitry. The base product number LD1117 covers a family of fixed and adjustable output voltages in TO-220 and SMD packages; the V33C suffix locks the 3.3 V fixed output and through-hole TO-220 variant. Because this is an active catalog part with a long production history, it is available through multiple distribution channels.","metaTitle":"LD1117V33C STMicro 3.3V 800mA LDO Regulator TO-220","metaDescription":"LD1117V33C from STMicroelectronics: fixed 3.3V output, 800mA LDO, 1.3V max dropout, 75dB PSRR at 120Hz, -40°C to 125°C, TO-220-3. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","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":"Active","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":"$1.3100","priceTiers":[{"qty":1,"price":"$1.31000","currency":"USD"},{"qty":10,"price":"$1.15100","currency":"USD"},{"qty":25,"price":"$1.08120","currency":"USD"},{"qty":100,"price":"$0.88250","currency":"USD"},{"qty":250,"price":"$0.81964","currency":"USD"},{"qty":500,"price":"$0.69760","currency":"USD"},{"qty":1000,"price":"$0.57584","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/494bb92f4effb270dec91ee8a399de6d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LD1117V33C/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LD1117V33C","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LD1117V33C when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}