{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LK112M33TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LK112M33TR","canonicalUrl":"https://icboms.com/stmicroelectronics/LK112M33TR","factsUrl":"https://icboms.com/api/mcp/products/LK112M33TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LK112M33TR linear regulator, fixed 3.3V output, 150mA, positive, enable, overcurrent and overtemperature protection, SOT-23-5, Tape & Reel.","salesMarkdown":"## Fixed 3.3V rail at 150 mA — the board-level fit The LK112M33TR is a single-output positive linear regulator delivering a fixed 3.3 V at up to 150 mA from a maximum input of 14 V. That 3.3 V rail is the common digital core or I/O supply for a wide range of MCUs, sensors, and interface ICs — the 150 mA ceiling covers a small Cortex-M0 system or a single MEMS sensor plus its buffer, but not a multi-rail FPGA bank. ## PSRR at 400 Hz — what the 55 dB means for the downstream noise budget PSRR is specified at 55 dB at 400 Hz — that is the rejection ratio for ripple on the input rail at that frequency. A 100 mVpp ripple at 400 Hz on the input appears as roughly 0.18 mVpp on the output. The dropout voltage is 0.35 V max at the full 150 mA load — the input rail must stay above 3.65 V across the load range to keep the output in regulation. A 5 V rail with 5% tolerance (4.75 V min) provides 1.1 V of headroom, well clear of dropout. ## Quiescent current and enable — battery-life implications Quiescent current is 250 µA typical — the regulator's own draw when delivering load. ## Temperature range and protection — where it survives The operating junction temperature range is -30°C to 125°C, covering industrial and most automotive under-hood ambient conditions. Integrated overcurrent and overtemperature protection means the part will current-limit or thermally shut down before damaging itself under a sustained fault — useful for a supply rail that might see a momentary short during board assembly or in the field. ## SOT-23-5 package — footprint and rework context It is a common, low-cost, manually solderable footprint that fits on a two-layer board without micro-vias. The enable pin is on pin 3; the typical application circuit requires two small ceramic bypass caps on the input and output.","metaTitle":"STMicro LK112M33TR LDO, 3.3V Fixed, 150mA, SOT-23-5","metaDescription":"STMicroelectronics LK112M33TR linear regulator, 3.3V fixed output at 150mA. Active production, ROHS3 compliant. PSRR 55dB at 400Hz. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"PSRR":"55dB (400Hz)","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"SC-74A, SOT-753","lifecycle_stage":"eol_hot","Control Features":"Enable","Current - Output":"150mA","Protection Features":"Over Current, Over Temperature","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-30°C ~ 125°C","Voltage - Input (Max)":"14V","Voltage Dropout (Max)":"0.35V @ 150mA","Supplier Device Package":"SOT-23-5","Current - Quiescent (Iq)":"250 µA","Voltage - Output (Min/Fixed)":"3.3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.89","priceTiers":[{"qty":1,"price":"$0.89000","currency":"USD"},{"qty":10,"price":"$0.78200","currency":"USD"},{"qty":25,"price":"$0.73480","currency":"USD"},{"qty":100,"price":"$0.59970","currency":"USD"},{"qty":250,"price":"$0.55700","currency":"USD"},{"qty":500,"price":"$0.47404","currency":"USD"},{"qty":1000,"price":"$0.39130","currency":"USD"},{"qty":3000,"price":"$0.39130","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/bb78e09eb54e12bef06ece81ee2a6a21.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LK112M33TR/alternatives.json"},"ai":{"faq":[{"question":"What is the PSRR of the LK112M33TR at 400 Hz?","answer":"The LK112M33TR has a PSRR of 55 dB at 400 Hz. This means a 100 mVpp ripple on the input at that frequency is attenuated to about 0.18 mVpp on the output."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LK112M33TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LK112M33TR 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}}