{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2940S-12/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM2940S-12-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM2940S-12-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM2940S-12%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM2940S-12/NOPB, fixed 12V output LDO regulator, 1A output current, 66dB PSRR at 120Hz, TO-263-4 (D²Pak) surface-mount package, -40°C to 125°C operating temperature.","salesMarkdown":"It comes in a TO-263-4 (D²Pak) surface-mount package with three leads plus the tab — the tab is the output and the primary heat path, so the PCB copper area under it determines how much current you can actually pull before hitting the thermal limit. The 1V max dropout at full load means you need at least 13V on the input to hold regulation; a 26V absolute maximum input gives headroom for 24V nominal rails with margin. The 66 dB PSRR at 120 Hz is useful when the input comes from a full-wave rectified bulk supply — it knocks down the 120 Hz ripple before it reaches the load. Protection is built in: over-current, over-temperature, reverse polarity, and short circuit. That reduces the need for external crowbar or clamp circuits on the output. Quiescent current runs 10 mA typical, 15 mA max — not a low-Iq part for battery standby, but acceptable for always-on industrial rails where the load current dominates. ## Active lifecycle and RoHS compliance — no LTB pressure The /NOPB suffix confirms RoHS3 compliance and lead-free construction, so it passes the usual EU and global material restrictions without an exemption. For a production BOM this means no forced redesign cycle from obsolescence. ## Package and thermal — the tab is your heatsink The large copper tab on the bottom carries the bulk of the dissipation. At 1A output with 13V input (1V dropout), the regulator dissipates roughly 1W — manageable with a modest copper pour on the PCB. At higher input voltages the dropout stays the same but the pass element sees the full Vin–Vout differential, so thermal design needs to account for the actual input rail, not just the dropout figure. The fixed 12V output needs no external resistor divider. The output capacitor should be a low-ESR electrolytic or tantalum in the 10 µF to 100 µF range for stability — the datasheet's recommended range, not the bare minimum. Ceramic caps with high DC bias derating can drop below the required capacitance at voltage, so check the effective capacitance at 12V.","metaTitle":"LM2940S-12/NOPB 12V 1A LDO Regulator, TO-263, -40°C to 125°C","metaDescription":"Texas Instruments LM2940S-12/NOPB is a 12V fixed-output LDO rated for 1A, 66dB PSRR at 120Hz, industrial temp range -40°C to 125°C. Active, RoHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"Texas Instruments","PSRR":"66dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-263-4, D²Pak (3 Leads + Tab), TO-263AA","Product Status":"Active","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":"-40°C~125°C","Voltage - Input (Max)":"26V","Voltage Dropout (Max)":"1V @ 1A","Current - Supply (Max)":"15 mA","Voltage - Output (Max)":"-","Supplier Device Package":"DDPAK/TO-263-3","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"12V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.9000","priceTiers":[{"qty":1,"price":"$2.90000","currency":"USD"},{"qty":10,"price":"$2.60400","currency":"USD"},{"qty":25,"price":"$2.45640","currency":"USD"},{"qty":100,"price":"$2.09300","currency":"USD"},{"qty":250,"price":"$1.96524","currency":"USD"},{"qty":500,"price":"$1.71958","currency":"USD"},{"qty":1000,"price":"$1.42480","currency":"USD"},{"qty":2500,"price":"$1.39050","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/f1c4256f4019947c4206f2126daf8930.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM2940S-12%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the LM2940S-12/NOPB and what is the price?","answer":"Submit a request for current pricing and lead time — no automated price is published here."},{"question":"Does the LM2940S-12/NOPB have a lead-free / RoHS compliant option?","answer":"Yes, the /NOPB suffix indicates RoHS3 compliance and lead-free construction. No additional exemption documentation is needed for standard EU or global RoHS requirements."},{"question":"What is the thermal performance of the LM2940S-12/NOPB under load?","answer":"At 1A output with 1V dropout the regulator dissipates about 1W. The TO-263 tab is the primary heat path; a copper pour on the PCB under the tab is needed to keep the junction below the 125°C maximum. At higher input voltages the dissipation increases linearly with the Vin–Vout differential."},{"question":"How does the LM2940S-12/NOPB compare to the LM2940T-12?","answer":"The LM2940T-12 is the through-hole TO-220 version of the same regulator. The LM2940S-12/NOPB is the surface-mount TO-263 variant. Electrical specs (1A output, 12V fixed, 66dB PSRR, same protection features) are identical. The choice is purely a board-assembly decision — reflow vs. through-hole soldering."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM2940S-12-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/LM2940S-12-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}}