{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LP38691DTX-1.8/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LP38691DTX-1.8-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LP38691DTX-1.8-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LP38691DTX-1.8%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LP38691 series LDO voltage regulator, fixed 1.8V output, 500mA, TO-252-3 (DPak) surface-mount package, 55dB PSRR at 120Hz, -40°C to 125°C operating range.","salesMarkdown":"## Fixed 1.8V rail for noise-sensitive loads The LP38691DTX-1.8/NOPB: With 55 dB of PSRR at 120 Hz, this part filters mains-derived ripple on the upstream supply — relevant when the input comes from a rectified AC source or a switching pre-regulator that leaves 100/120 Hz ripple on the bus. Quiescent current is 55 µA typical, and the maximum supply current is 100 µA — low enough for always-on rails in battery-powered or energy-harvesting designs where every microamp counts. ## Thermal and package fit for the BOM Operating temperature spans -40°C to 125°C, so the regulator can sit on a board that sees under-hood ambient or industrial enclosure heat without derating the output current below 500 mA. Integrated over-temperature protection shuts the output down if the junction exceeds the thermal limit — no external watchdog or crowbar circuit needed for fault recovery. ## Active lifecycle and compliance posture ROHS3 compliant per the manufacturer's declaration — no restricted substances above the threshold limits, which clears the part for EU RoHS and similar regional regulations without an exemption expiry risk.","metaTitle":"LP38691DTX-1.8/NOPB LDO, 1.8V Fixed, 500mA, TO-252-3","metaDescription":"Texas Instruments LP38691DTX-1.8/NOPB LDO regulator, 1.8V fixed output, 500mA, 55dB PSRR at 120Hz, -40 to 125°C, TO-252-3. Active, ROHS3. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"PSRR":"55dB (120Hz)","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-252-3, DPak (2 Leads + Tab), SC-63","lifecycle_stage":"eol_hot","Current - Output":"500mA","Protection Features":"Over Temperature","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C","Voltage - Input (Max)":"10V","Current - Supply (Max)":"100 µA","Supplier Device Package":"TO-252-3","Current - Quiescent (Iq)":"55 µA","Voltage - Output (Min/Fixed)":"1.8V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.18","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$2.18000","currency":"USD"},{"qty":10,"price":"$1.95500","currency":"USD"},{"qty":25,"price":"$1.84440","currency":"USD"},{"qty":100,"price":"$1.57140","currency":"USD"},{"qty":250,"price":"$1.47552","currency":"USD"},{"qty":500,"price":"$1.29108","currency":"USD"},{"qty":1000,"price":"$1.06975","currency":"USD"},{"qty":2500,"price":"$1.04400","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/646e217adc5eed5fb5e0b93776e1ee3e.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the PSRR of LP38691DTX-1.8/NOPB at 120 Hz?","answer":"The power-supply rejection ratio is 55 dB at 120 Hz. This is the ripple attenuation from the input to the output at the fundamental frequency of a full-wave rectified mains supply."},{"question":"What package does LP38691DTX-1.8/NOPB come in?","answer":"It ships in a TO-252-3 (DPak) surface-mount package, also referenced as SC-63. The supplier device package is TO-252-3."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LP38691DTX-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/LP38691DTX-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}}