{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM1085ISX-5.0/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM1085ISX-5.0-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM1085ISX-5.0-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM1085ISX-5.0%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM1085ISX-5.0/NOPB, 3A fixed 5V LDO regulator, surface-mount DDPAK/TO-263-3 package, -40°C to 125°C junction temperature, 1.5V max dropout at 3A, 68dB PSRR at 120Hz.","salesMarkdown":"## 3 A fixed 5 V LDO — what it brings to the rail The Texas Instruments LM1085ISX-5.0/NOPB is a single-output, positive fixed 5 V LDO regulator rated for 3 A continuous output. It is built for industrial and automotive-grade environments, with a junction temperature range of -40°C to 125°C and protection features including over-current and over-temperature shutdown. The 1.5 V maximum dropout at 3 A means it holds regulation through input dips down to 6.5 V — relevant for 5 V rails fed from a 12 V bus that sees cold-crank or transient sag. The 68 dB PSRR at 120 Hz makes it a natural choice for post-rectifier smoothing in AC-fed supplies or for cleaning up ripple in audio / instrumentation rails where line-frequency rejection matters. ## Dropout and PSRR — the numbers that decide fit Dropout is quoted as 1.5 V max at 3 A, so the input must stay above 6.5 V to maintain a clean 5 V output at full load. That is a tighter headroom requirement than the LP5907 series (which operates down to 5.5 V input but only delivers 250 mA), but the LM1085 is in a different load tier — 3 A continuous versus 250 mA. The 68 dB PSRR at 120 Hz is a solid figure for a 3 A LDO; it attenuates full-wave-rectified ripple by roughly 99.96%, which simplifies downstream filtering for sensitive analog circuits. ## Active lifecycle — no obsolescence risk The LM1085ISX-5.0/NOPB carries an Active lifecycle status, meaning TI continues to manufacture and support it for new designs. No end-of-life notice or last-time-buy window is in effect. ROHS3 compliant per the listing. This part is a stable line item for production BOMs. ## Package and mounting — DDPAK/TO-263-3 Supplied in Tape & Reel (TR) or Cut Tape (CT), surface-mount DDPAK/TO-263-3 (3 leads plus tab). The exposed tab is the output, so the PCB copper pour serves double duty as a thermal spreader. For 3 A continuous dissipation, a via-stitched thermal pad under the tab is necessary — without it the junction temperature climbs quickly above 400 mA.","metaTitle":"LM1085ISX-5.0/NOPB 3A Fixed 5V LDO, DDPAK/TO-263-3, Active","metaDescription":"TI LM1085ISX-5.0/NOPB 3A fixed 5V LDO, 1.5V dropout max, 68dB PSRR at 120Hz, -40 to 125°C. Active, tape & reel.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"PSRR":"68dB (120Hz)","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-263-4, D²Pak (3 Leads + Tab), TO-263AA","lifecycle_stage":"eol_hot","Current - Output":"3A","Protection Features":"Over Current, Over Temperature","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C (TJ)","Voltage - Input (Max)":"25V","Voltage Dropout (Max)":"1.5V @ 3A","Supplier Device Package":"DDPAK/TO-263-3","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.99","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.99000","currency":"USD"},{"qty":10,"price":"$1.79100","currency":"USD"},{"qty":25,"price":"$1.68920","currency":"USD"},{"qty":100,"price":"$1.43930","currency":"USD"},{"qty":250,"price":"$1.35144","currency":"USD"},{"qty":500,"price":"$1.18252","currency":"USD"},{"qty":1000,"price":"$0.97979","currency":"USD"},{"qty":2500,"price":"$0.91222","currency":"USD"},{"qty":5000,"price":"$0.87844","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/1893fb6e470658eed89c4059c0c10361.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Can I use LM1085ISX-5.0/NOPB as a replacement for the LM1085IT-5.0?","answer":"The LM1085IT-5.0 is the through-hole TO-220 version of the same regulator. The LM1085ISX-5.0/NOPB is the surface-mount DDPAK/TO-263 variant with identical electrical ratings — same 3 A output, same 5 V fixed output, same dropout and PSRR. If your board layout accepts the DDPAK footprint, it is a direct functional replacement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM1085ISX-5.0-NOPB","citationPolicyUrl":"https://icboms.com/llms.txt","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}