{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM340T-5.0/LF01","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM340T-5.0-LF01","canonicalUrl":"https://icboms.com/texas-instruments/LM340T-5.0-LF01","factsUrl":"https://icboms.com/api/mcp/products/LM340T-5.0%2FLF01","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM340T-5.0/LF01, fixed 5V positive linear regulator, 1.5A output, TO-263-4 D²Pak surface-mount package, 80dB PSRR at 120Hz, active RoHS3.","salesMarkdown":"## 5V rail for analog and logic — what the 1.5A rating buys you The LM340T-5.0/LF01 is a fixed 5V positive linear regulator from Texas Instruments, delivering up to 1.5A continuous output. That 1.5A ceiling means it can power a mixed-signal board with a few op-amps, an MCU, and some logic without needing a separate 3.3V rail — the 5V bus handles the analog front-end and the 5V-tolerant logic together. The 35V maximum input gives you headroom on common rails — a 12V supply leaves 30V of dropout margin, and a 24V industrial bus still has 11V of room before the regulator hits its limit. The 2V dropout at 1A is the real constraint: your input must stay above 7V to hold 5V regulation at full load. ## PSRR at 120 Hz — why that number matters on a rectified rail The 80dB PSRR at 120Hz is the spec that tells you how well this regulator cleans up ripple from a full-wave rectified mains supply. 120Hz is the fundamental ripple frequency from a 60Hz line after bridge rectification — 80dB of rejection knocks a 1V peak-to-peak ripple down to 100µV at the output. That is clean enough for a 12-bit ADC reference rail or a sensitive analog front-end without a post-filter. The 8 mA quiescent current is the regulator's own draw — it does not come out of the 1.5A load budget, but it does add to the thermal dissipation at high input-output differential. At 24V in and 5V out at 1A, the 19V drop times 1A plus the 8 mA Iq gives about 19W of heat to sink — the TO-263 D²Pak exposed tab is designed for that, but the PCB copper area and airflow need to be part of the thermal calculation. ## Package and board-fit — TO-263 D²Pak with the exposed tab The TO-263-4 (D²Pak) surface-mount package has three leads plus the exposed tab — the tab is the thermal path and is electrically connected to ground (output). A 2x2 inch copper area on a 2-layer board with no forced air is marginal at 1.5A with high dropout — budget a thermal simulation or at least a thermocouple check on the first prototype. The over-temperature and short-circuit protection are built in — the regulator shuts down if the die exceeds the thermal limit, and the current-limit circuit folds back the output if the load tries to pull more than the rated 1.5A. That means you do not need an external crowbar or a series fuse for the regulator itself, though the upstream power supply should still be fused for the full input current. ## Active lifecycle and compliance — no obsolescence worry No stock-holding claim; each BOM quantity is quoted individually.","metaTitle":"LM340T-5.0/LF01 Texas Instruments Linear Regulator, 5V 1.5A","metaDescription":"LM340T-5.0/LF01, Texas Instruments, 5V fixed output, 1.5A, 80dB PSRR, TO-263 D²Pak. Active, RoHS3. Sourced per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"PSRR":"80dB (120Hz)","Package":"Tube","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-263-4, D²Pak (3 Leads + Tab), Variant","lifecycle_stage":"eol_hot","Current - Output":"1.5A","Protection Features":"Over Temperature, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"0°C ~ 125°C","Voltage - Input (Max)":"35V","Voltage Dropout (Max)":"2V @ 1A","Supplier Device Package":"TO-220-3, LF01","Current - Quiescent (Iq)":"8 mA","Voltage - Output (Min/Fixed)":"5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.97","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.97000","currency":"USD"},{"qty":10,"price":"$1.76700","currency":"USD"},{"qty":25,"price":"$1.66680","currency":"USD"},{"qty":100,"price":"$1.42020","currency":"USD"},{"qty":250,"price":"$1.33348","currency":"USD"},{"qty":500,"price":"$1.16680","currency":"USD"},{"qty":1000,"price":"$0.96677","currency":"USD"},{"qty":2500,"price":"$0.94350","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/f3872e5e42c11c356e800e32f2654004.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy LM340T-5.0/LF01 and how is it quoted?","answer":"This part is sourced to order through independent distribution."},{"question":"What is the PSRR of LM340T-5.0/LF01?","answer":"The PSRR is 80dB at 120Hz. This is the ripple rejection at the fundamental frequency of a full-wave rectified 60Hz mains supply, meaning 1V of input ripple is attenuated to about 100µV at the output."},{"question":"What package does LM340T-5.0/LF01 come in?","answer":"It comes in a TO-263-4 (D²Pak) surface-mount package with three leads plus an exposed thermal tab. The supplier device package is listed as TO-220-3, LF01, but the actual package is the D²Pak variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM340T-5.0-LF01","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM340T-5.0-LF01 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}}