{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LDK320ADU33R","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LDK320ADU33R","canonicalUrl":"https://icboms.com/stmicroelectronics/LDK320ADU33R","factsUrl":"https://icboms.com/api/mcp/products/LDK320ADU33R","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LDK320ADU33R, fixed-output positive LDO regulator, 3.3V, 200mA, 0.35V dropout max, 90µA quiescent current, PSRR 88dB ~ 48dB (120Hz ~ 10kHz), SOT-89 (TO-243AA) package, -40°C to 125°C junction temperature.","salesMarkdown":"## 3.3V fixed LDO for industrial and automotive rails Key features include a maximum dropout voltage of 0.35 V at the full 200 mA load, a quiescent current of 90 µA typical, and a supply current ceiling of 100 µA. The part integrates over-current and over-temperature protection. The LDK320ADU33R delivers 88 dB of power-supply rejection at 120 Hz, dropping to 48 dB at 10 kHz. That 88 dB at line frequency is strong — it cleans up the 100/120 Hz ripple from a rectified mains supply down to microvolt levels. The roll-off above 1 kHz means this LDO alone won't fully suppress switching-regulator ripple in the 100 kHz to 1 MHz range; a post-filter LC stage or a separate low-noise regulator is worth budgeting if the load is an analog front-end or a PLL supply. At 200 mA with 1 V input-to-output differential, dissipation is 200 mW. It is ROHS3 compliant. For new designs this part is a current-production choice — no EOL risk on the near horizon.","metaTitle":"STMicroelectronics LDK320ADU33R LDO Regulator, 3.3V 200mA","metaDescription":"ST LDK320ADU33R fixed 3.3V output LDO, 200mA, 0.35V dropout max, 90µA Iq, PSRR 88dB at 120Hz. SOT-89 package, -40 to 125°C. Active, available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"PSRR":"88dB ~ 48dB (120Hz ~ 10kHz)","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-243AA","lifecycle_stage":"eol_hot","Current - Output":"200mA","Protection Features":"Over Current, Over Temperature","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C (TJ)","Voltage - Input (Max)":"18V","Voltage Dropout (Max)":"0.35V @ 200mA","Current - Supply (Max)":"100 µA","Supplier Device Package":"SOT-89","Current - Quiescent (Iq)":"90 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":"$0.79300","currency":"USD"},{"qty":25,"price":"$0.75280","currency":"USD"},{"qty":100,"price":"$0.61840","currency":"USD"},{"qty":250,"price":"$0.57804","currency":"USD"},{"qty":500,"price":"$0.51084","currency":"USD"},{"qty":1000,"price":"$0.40329","currency":"USD"},{"qty":2500,"price":"$0.37641","currency":"USD"},{"qty":5000,"price":"$0.35759","currency":"USD"},{"qty":12500,"price":"$0.34414","currency":"USD"},{"qty":25000,"price":"$0.33339","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/6ebb962cd36cb2f7f9e5df5a63090103.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LDK320ADU33R/alternatives.json"},"ai":{"faq":[{"question":"Does LDK320ADU33R have thermal shutdown protection?","answer":"Yes, the part includes over-temperature protection as one of its integrated protection features, alongside over-current protection."},{"question":"Is LDK320ADU33R a direct replacement for LD39020DTPU33R?","answer":"Both are 3.3 V fixed-output 200 mA LDOs in SOT-89 packages with the same temperature range, but the LD39020DTPU33R has a lower maximum input voltage of 5.5 V versus the LDK320ADU33R's 18 V. They are not pin-compatible substitutes — the LDK320ADU33R handles higher input rails, while the LD39020DTPU33R adds an enable pin and soft-start. Check the input voltage and control feature requirements before substituting."},{"question":"What is the PSRR of LDK320ADU33R?","answer":"The power-supply rejection ratio is 88 dB at 120 Hz, rolling off to 48 dB at 10 kHz. This makes it effective for 100/120 Hz mains ripple but less so for high-frequency switching noise above 1 MHz."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LDK320ADU33R","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LDK320ADU33R 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}}