{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2940CS-15/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM2940CS-15-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM2940CS-15-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM2940CS-15%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM2940CS-15/NOPB, 15V fixed positive LDO regulator, 1A output, 0.8V dropout max at 1A, 64dB PSRR at 120Hz, TO-263-4 (D2PAK) surface-mount package, 0°C to 125°C operating temperature.","salesMarkdown":"## 15 V fixed rail, 1 A continuous — the field-fit check The Texas Instruments LM2940CS-15/NOPB is a fixed 15 V positive-output LDO regulator rated for 1 A continuous output current. It comes in a TO-263-4 (D2PAK) surface-mount package with three leads plus the tab, and operates over 0°C to 125°C. ## Dropout headroom and input compatibility Maximum dropout is 0.8 V at the full 1 A load. That means a 15 V output needs at least 15.8 V at the input pin to stay in regulation. With a maximum input of 26 V, this part works cleanly from a 24 V bus — common in factory automation — but is not compatible with a 5 V input, because the dropout alone eats more than the available headroom. For battery-backed or always-on rails, that Iq is worth noting — it is not a micropower LDO, but it is reasonable for a 1 A fixed-output part. ## Protection set and PSRR for noisy environments Built-in protection covers over current, over temperature, reverse polarity, and short circuit. That saves external clamp diodes and foldback circuits on the board. The 64 dB PSRR at 120 Hz means the output rejects a good chunk of full-wave-rectified ripple — useful when this regulator follows a transformer-and-capacitor front end rather than a switcher.","metaTitle":"LM2940CS-15/NOPB 15V Fixed Output LDO Regulator, 1A, TO-263","metaDescription":"Texas Instruments LM2940CS-15/NOPB: 15V fixed positive LDO, 1A output, 0.8V dropout max, 64dB PSRR at 120Hz. Active production, TO-263-4 package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"Texas Instruments","PSRR":"64dB (120Hz)","Series":"-","Packaging":"Tube","Output Type":"Fixed","Part Status":"Active","Mounting Type":"Surface Mount","Package / Case":"TO-263-4, D2PAK (3 Leads + Tab), TO-263AA","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"1A","Base Product Number":"LM2940","Protection Features":"Over Current, Over Temperature, Reverse Polarity, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"0°C ~ 125°C","Voltage - Input (Max)":"26V","Voltage Dropout (Max)":"0.8V @ 1A","Current - Supply (Max)":"15 mA","Voltage - Output (Max)":"-","Supplier Device Package":"TO-263 (DDPAK-3)","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"15V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.6200","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f1c4256f4019947c4206f2126daf8930.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM2940CS-15%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"Is LM2940CS-15/NOPB compatible with 5V input?","answer":"No. The output is fixed at 15 V, and the maximum dropout is 0.8 V at 1 A, so the input must be at least 15.8 V to regulate. A 5 V input cannot provide the necessary headroom."},{"question":"What is LM2940CS-15/NOPB's listed PSRR?","answer":"The PSRR is specified at 64 dB at 120 Hz. That is the line-frequency rejection figure — it tells you how well the output attenuates full-wave-rectified ripple from a mains-derived supply."},{"question":"How does LM2940CS-15/NOPB compare to LM2940CS-15?","answer":"The LM2940CS-15/NOPB is the lead-free / RoHS-compliant version of the original LM2940CS-15. The electrical specifications — 15 V fixed output, 1 A, 0.8 V dropout, 64 dB PSRR — are identical. The NOPB suffix indicates no lead (Pb) in the finish."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM2940CS-15-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/LM2940CS-15-NOPB when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}