{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LT1121IS8-3.3#TRPBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LT1121IS8-3.3TRPBF","canonicalUrl":"https://icboms.com/analog-devices/LT1121IS8-3.3TRPBF","factsUrl":"https://icboms.com/api/mcp/products/LT1121IS8-3.3%23TRPBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LT1121IS8-3.3#TRPBF LDO linear regulator, fixed 3.3V output, 150mA, 0.7V dropout, 58dB PSRR at 120Hz, 8-SOIC surface mount, -40°C to 125°C.","salesMarkdown":"## 150mA fixed 3.3V LDO — what the dropout and PSRR mean on your board The LT1121IS8-3.3#TRPBF is a single-output positive LDO from Analog Devices, delivering a fixed 3.3V at up to 150mA. Maximum dropout is 0.7V at full load, so the input rail needs to stay above 4.0V to keep the output in regulation — a 5V bus with a 0.5V diode drop still leaves enough headroom. PSRR is 58dB at 120Hz, which means it knocks down line-frequency ripple from a rectified AC supply by a factor of roughly 800 — useful when this LDO is post-regulating a noisy 5V rail in an industrial controller or a battery charger. Quiescent current is 50µA typical, so in always-on applications like a sensor node or a keep-alive rail the regulator's own draw won't dominate the battery budget. ## 8-SOIC package — board fit and rework Housed in an 8-SOIC (0.154-inch wide, 3.90mm body width), the LT1121IS8-3.3#TRPBF uses a standard footprint that solders with a basic iron or hot-air station — no thermal pad, no exposed paddle, so rework on a populated board is straightforward. ROHS3 compliant, so it meets the current EU restriction directive without an exemption.","metaTitle":"LT1121IS8-3.3#TRPBF LDO, 150mA, 3.3V fixed, 8-SOIC","metaDescription":"Analog Devices LT1121IS8-3.3#TRPBF LDO regulator, 150mA fixed 3.3V output, 0.7V dropout, 58dB PSRR at 120Hz, -40 to 125°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Interface & Transceivers"],"specifications":{"PSRR":"58dB (120Hz)","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":"150mA","Protection Features":"Over Temperature, Reverse Polarity","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C","Voltage - Input (Max)":"30V","Voltage Dropout (Max)":"0.7V @ 150mA","Current - Supply (Max)":"14 mA","Supplier Device Package":"8-SO","Current - Quiescent (Iq)":"50 µA","Voltage - Output (Min/Fixed)":"3.3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.61","stockQuantity":15,"priceTiers":[{"qty":1,"price":"$6.61000","currency":"USD"},{"qty":10,"price":"$5.93700","currency":"USD"},{"qty":25,"price":"$5.61320","currency":"USD"},{"qty":100,"price":"$4.86470","currency":"USD"},{"qty":250,"price":"$4.61520","currency":"USD"},{"qty":500,"price":"$4.14120","currency":"USD"},{"qty":1000,"price":"$3.49258","currency":"USD"},{"qty":2500,"price":"$3.31795","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the PSRR of LT1121IS8-3.3#TRPBF?","answer":"58dB at 120Hz. That is the line-frequency ripple rejection — enough to clean up a rectified AC supply before feeding sensitive analog circuitry."},{"question":"Will LT1121IS8-3.3#TRPBF drop into a board designed for ADP166ACPZN-3.3-R7?","answer":"Not without a board spin. The ADP166ACPZN-3.3-R7 comes in a 6-lead LFCSP package (3mm x 3mm), while the LT1121 uses an 8-SOIC. Both deliver 150mA at 3.3V fixed, but the pinout and footprint are different — the ADP166 also has a lower maximum input voltage (5.5V vs 30V)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LT1121IS8-3.3TRPBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LT1121IS8-3.3TRPBF 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}}