{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LP38691DT-3.3/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LP38691DT-3.3-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LP38691DT-3.3-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LP38691DT-3.3%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LP38691DT-3.3/NOPB LDO linear regulator, fixed 3.3 V output, 500 mA, TO-252-3 (DPak) surface-mount package, 55 dB PSRR at 120 Hz, -40 to 125 °C operating range.","salesMarkdown":"## Dropout and PSRR — what the numbers mean for the rail The LP38691DT-3.3/NOPB: At lower currents dropout is lower, but the 0.55 V ceiling governs worst-case headroom. PSRR is 55 dB at 120 Hz — this is the ripple rejection at the fundamental of a full-wave rectified line. Quiescent current is 55 µA typical, with a maximum supply current of 100 µA. This Iq is low enough for always-on or battery-backed rails where the regulator's own draw matters for standby power. ## Temperature grade and package fit Input voltage maximum is 10 V — the part can run from a 5 V or 9 V rail, but the dropout headroom and power dissipation in the package set the practical ceiling. At 500 mA with 5 V input, the power dissipated is (5.0 - 3.3) × 0.5 = 0.85 W; the TO-252-3's thermal resistance (junction-to-ambient, ~80 °C/W with a 1-inch² pad) keeps the junction below 125 °C in still air. ## Protection and sourcing posture The LP38691DT-3.3/NOPB includes over-temperature protection — the regulator shuts down when the junction exceeds the thermal limit, then auto-recovers after cooling. No over-current protection is listed, so the output current is limited by the pass-element SOA and the thermal foldback.","metaTitle":"LP38691DT-3.3/NOPB LDO, 3.3V fixed, 500mA, TO-252-3","metaDescription":"Texas Instruments LP38691DT-3.3/NOPB LDO regulator, fixed 3.3V output, 500mA, 55dB PSRR at 120Hz, -40 to 125°C, TO-252-3. Active, ROHS3. Order via RFQ.","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":"Tube","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","Voltage Dropout (Max)":"0.55V @ 500mA","Current - Supply (Max)":"100 µA","Supplier Device Package":"TO-252-3","Current - Quiescent (Iq)":"55 µA","Voltage - Output (Min/Fixed)":"3.3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.55","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$2.55000","currency":"USD"},{"qty":10,"price":"$2.29500","currency":"USD"},{"qty":25,"price":"$2.16520","currency":"USD"},{"qty":100,"price":"$1.84460","currency":"USD"},{"qty":250,"price":"$1.73204","currency":"USD"},{"qty":500,"price":"$1.51554","currency":"USD"},{"qty":1000,"price":"$1.25573","currency":"USD"},{"qty":2500,"price":"$1.22550","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/646e217adc5eed5fb5e0b93776e1ee3e.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What package does LP38691DT-3.3/NOPB come in?","answer":"It is supplied in a TO-252-3 (DPak) surface-mount package with 2 leads and a tab. The supplier device package is TO-252-3. The part ships in tube packaging."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LP38691DT-3.3-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/LP38691DT-3.3-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}}