{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LP3990MFX-1.8/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LP3990MFX-1.8-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LP3990MFX-1.8-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LP3990MFX-1.8%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LP3990MFX-1.8/NOPB fixed-output LDO, 1.8V, 150mA, 200mV dropout, 80µA quiescent, SOT-23-5, -40°C to 85°C, active.","salesMarkdown":"## 1.8 V fixed LDO — parametric fit for 150 mA rail The LP3990MFX-1.8/NOPB is a fixed 1.8 V output LDO from Texas Instruments, rated for 150 mA continuous output with a maximum dropout of 0.2 V at full load. Quiescent current is 80 µA typical, with a maximum supply current of 120 µA. For a battery-powered sensor node that stays awake 1 % of the time, the regulator's own draw adds about 1 µA average to the system budget — negligible against a 150 mA load pulse but significant if the rail powers a deep-sleep domain where every microamp counts. ## PSRR across the audio band Power-supply rejection ratio is specified at 55 dB at 1 kHz and 35 dB at 10 kHz. At 1 kHz, that 55 dB attenuates a 100 mVpp ripple on the input to about 180 µVpp at the output — clean enough for an analog front-end or a codec supply. The 20 dB roll-off by 10 kHz means switching-regulator ripple above that frequency passes through with less rejection; a 1 MHz switcher's fundamental ripple will see roughly 30 dB of attenuation, so a post-filter LC stage ahead of this LDO is worth considering if the load is noise-sensitive. ## Package, temperature grade, and protection Housed in a SOT-23-5 (SC-74A) package, the LP3990MFX-1.8/NOPB occupies about 3 mm × 3 mm on the board — a standard footprint for 150 mA-class LDOs, reflow-compatible with lead-free profiles. On-chip protection includes over-temperature shutdown and short-circuit current limiting. The short-circuit limit folds back the output current, so a hard short on the 1.8 V rail won't exceed the package's thermal capacity before the thermal trip engages. Enable control lets the system power down the regulator, dropping quiescent current to near zero — useful for sequencing or sleep-mode power gating. The device is ROHS3 compliant, covering the EU RoHS exemption set including lead in high-melting-temperature solder.","metaTitle":"LP3990MFX-1.8/NOPB LDO 1.8V 150mA SOT-23-5","metaDescription":"Texas Instruments LP3990MFX-1.8/NOPB fixed 1.8V LDO, 150mA, 200mV dropout, 80µA quiescent, SOT-23-5. Active production, RoHS3. Quoted per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"PSRR":"55dB ~ 35dB (1kHz ~ 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":"150mA","Protection Features":"Over Temperature, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 85°C","Voltage - Input (Max)":"6V","Voltage Dropout (Max)":"0.2V @ 150mA","Current - Supply (Max)":"120 µA","Supplier Device Package":"SOT-23-5","Current - Quiescent (Iq)":"80 µA","Voltage - Output (Min/Fixed)":"1.8V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.96","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.96000","currency":"USD"},{"qty":10,"price":"$0.84700","currency":"USD"},{"qty":25,"price":"$0.79520","currency":"USD"},{"qty":100,"price":"$0.64900","currency":"USD"},{"qty":250,"price":"$0.60284","currency":"USD"},{"qty":500,"price":"$0.51304","currency":"USD"},{"qty":1000,"price":"$0.41043","currency":"USD"},{"qty":3000,"price":"$0.37195","currency":"USD"},{"qty":6000,"price":"$0.36300","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/343b93ba5a74788be3e584100b5d908a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the PSRR of the LP3990MFX-1.8/NOPB at 1 kHz and 10 kHz?","answer":"The PSRR is 55 dB at 1 kHz and 35 dB at 10 kHz. This means a 100 mVpp ripple at 1 kHz on the input is attenuated to about 180 µVpp at the output; at 10 kHz the same ripple passes through at roughly 1.8 mVpp."},{"question":"What package does the LP3990MFX-1.8/NOPB come in?","answer":"The device is supplied in a SOT-23-5 (SC-74A) surface-mount package."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LP3990MFX-1.8-NOPB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LP3990MFX-1.8-NOPB 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}}