{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LE33CD-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LE33CD-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/LE33CD-TR","factsUrl":"https://icboms.com/api/mcp/products/LE33CD-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LE33CD-TR linear regulator, 3.3V fixed output, 100mA, 8-SOIC (0.154\", 3.90mm Width), surface mount, Tape & Reel, active.","salesMarkdown":"## 3.3V fixed rail, 100mA capacity — the fit for a clean analog supply The LE33CD-TR is a single-output positive LDO from STMicroelectronics, delivering a fixed 3.3V at up to 100mA. The 0.5V max dropout at full load means the input rail must stay above 3.8V to maintain regulation — a 5V bus or a 3.6V Li-ion cell near end-of-discharge both provide enough headroom. Its PSRR profile — 80dB at 120Hz dropping to 60dB at 10kHz — tells you where the rejection lives: it scrubs 100/120Hz ripple from a rectified AC supply very well, but switching-regulator noise above 10kHz sees less attenuation. For a sensitive analog front-end, a post-filter LC stage ahead of this LDO is worth the board space. ## Industrial temperature range and protection set The 18V absolute-max input gives margin against 12V bus transients without an external clamp. Built-in over-current and over-temperature protection means the part folds back or shuts down before damaging itself — useful when the load is a shorted bypass cap or the ambient spikes above 125°C. The Enable pin lets a GPIO or supervisor pull the output to zero for sequenced power-up or low-power sleep. ## 8-SOIC footprint and tape-and-reel packaging The tape-and-reel option (Cut Tape also available) feeds pick-and-place without a reel change. ## Active lifecycle — no last-time-buy pressure For a BOM that needs a stable 3.3V LDO through the next several production runs, this part does not force a redesign cycle.","metaTitle":"STMicroelectronics LE33CD-TR LDO, 3.3V Fixed, 100mA, 8-SOIC","metaDescription":"STMicroelectronics LE33CD-TR linear regulator, 3.3V fixed output, 100mA, 8-SOIC package. PSRR 80dB~60dB (120Hz~10kHz). Active production, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Interface & Transceivers"],"specifications":{"PSRR":"80dB ~ 60dB (120Hz ~ 10kHz)","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Control Features":"Enable","Current - Output":"100mA","Protection Features":"Over Current, Over Temperature","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C","Voltage - Input (Max)":"18V","Voltage Dropout (Max)":"0.5V @ 100mA","Current - Supply (Max)":"3 mA","Supplier Device Package":"8-SOIC","Current - Quiescent (Iq)":"1 mA","Voltage - Output (Min/Fixed)":"3.3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.22","stockQuantity":15,"priceTiers":[{"qty":1,"price":"$1.22000","currency":"USD"},{"qty":10,"price":"$1.08800","currency":"USD"},{"qty":25,"price":"$1.03240","currency":"USD"},{"qty":100,"price":"$0.84790","currency":"USD"},{"qty":250,"price":"$0.79260","currency":"USD"},{"qty":500,"price":"$0.70044","currency":"USD"},{"qty":1000,"price":"$0.55298","currency":"USD"},{"qty":2500,"price":"$0.51611","currency":"USD"},{"qty":5000,"price":"$0.49030","currency":"USD"},{"qty":12500,"price":"$0.47187","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/79488437186ff138d01d7d54427ec4bd.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the PSRR of the LE33CD-TR and why does it matter?","answer":"The LE33CD-TR's PSRR is 80dB at 120Hz and 60dB at 10kHz. The 80dB figure at line frequency means it attenuates 100/120Hz ripple from a rectified AC supply by a factor of 10,000 — clean enough for a 16-bit ADC reference. The drop to 60dB at 10kHz means switching-regulator noise above that frequency passes through with only 1,000× attenuation; a low-pass filter ahead of the LDO helps."},{"question":"Does the LE33CD-TR drop in as a replacement for the LD39020DTPU33R?","answer":"Both are fixed 3.3V positive LDOs in 8-SOIC with Enable and over-current/over-temperature protection, so the pinout and footprint are the same. The LD39020DTPU33R delivers 200mA (double the LE33CD-TR's 100mA) but its input max is only 5.5V versus 18V. If your rail is below 5.5V and you need the extra current, the LD39020DTPU33R works; if you need the higher input voltage tolerance, the LE33CD-TR is the one."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LE33CD-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LE33CD-TR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}