{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LDK320M30R","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LDK320M30R","canonicalUrl":"https://icboms.com/stmicroelectronics/LDK320M30R","factsUrl":"https://icboms.com/api/mcp/products/LDK320M30R","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LDK320M30R, linear voltage regulator, fixed 3V output, 200mA, positive, surface-mount SOT-23-5, 88dB ~ 48dB PSRR (120Hz ~ 10kHz), 0.35V dropout max, 90 µA quiescent current, -40°C ~ 125°C junction temperature.","salesMarkdown":"The STMicroelectronics LDK320M30R is a fixed 3 V output, 200 mA positive LDO in a SOT-23-5 package. Its headline PSRR of 88 dB at 120 Hz drops to 48 dB at 10 kHz, which means the regulator knocks down low-frequency ripple from a mains-rectified rail or a DC-DC converter's fundamental very effectively, but the rejection rolls off well before the switching harmonics. For a 400 kHz switcher, the bulk of the attenuation happens at the fundamental; the 10 kHz figure is where you start to see the residual ripple on the output. The 0.35 V max dropout at 200 mA sets the input headroom — a 3.3 V rail needs to stay above 3.35 V to hold regulation at full load. Quiescent current sits at 90 µA, making this a candidate for always-on or lightly loaded rails where standby draw matters. ## Dropout and quiescent — the BOM-fit numbers The 0.35 V dropout maximum at 200 mA is the number to budget against the input rail's minimum during cold-crank or brownout. If the input is a 3.6 V rail, you have about 250 mV of margin before the output drops out. The 90 µA quiescent current is typical at no load; the supply current maximum is 100 µA. Enable control is provided, so the regulator can be gated off by a GPIO to cut the 90 µA when the load is shut down. Protection features include over-current and over-temperature shutdown — no reverse-current or reverse-voltage protection, so the output should not be driven above the input. No official second-source or pin-compatible alternate is listed by ST, but the LD39020DTPU33R (3.3 V fixed, 200 mA, SOT-23-5) shares the same package and output current rating, though its PSRR is specified at 80 dB to 55 dB over 1 kHz to 100 kHz and its input voltage max is 5.5 V versus 18 V for the LDK320M30R.","metaTitle":"STMicroelectronics LDK320M30R LDO Regulator, 3V Fixed Output","metaDescription":"ST LDK320M30R linear regulator: 3V fixed output, 200mA, 88dB PSRR at 120Hz, 0.35V dropout max, SOT-23-5. Active, ROHS3.","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":"SC-74A, SOT-753","lifecycle_stage":"eol_hot","Control Features":"Enable","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-23-5","Current - Quiescent (Iq)":"90 µA","Voltage - Output (Min/Fixed)":"3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.87","priceTiers":[{"qty":1,"price":"$0.91000","currency":"USD"},{"qty":10,"price":"$0.81400","currency":"USD"},{"qty":25,"price":"$0.77280","currency":"USD"},{"qty":100,"price":"$0.63490","currency":"USD"},{"qty":250,"price":"$0.59344","currency":"USD"},{"qty":500,"price":"$0.52444","currency":"USD"},{"qty":1000,"price":"$0.45570","currency":"USD"},{"qty":3000,"price":"$0.45570","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/6ebb962cd36cb2f7f9e5df5a63090103.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LDK320M30R/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LDK320M30R","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LDK320M30R 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}}