{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317EMPX/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM317EMPX-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM317EMPX-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM317EMPX%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM317EMPX/NOPB adjustable positive voltage regulator, 1.5A output, 37V max input, 1.25V to 37V output range, PSRR 80dB ~ 65dB (120Hz), SOT-223-4 surface-mount package, 0°C to 125°C operating temperature.","salesMarkdown":"## Adjustable 1.5A positive regulator in SOT-223-4 The Texas Instruments LM317EMPX/NOPB is a three-terminal adjustable positive voltage regulator delivering up to 1.5A output current from a 37V maximum input rail. Output voltage is set by two external resistors from a 1.25V reference to 37V, covering the classic LM317 application space in a surface-mount SOT-223-4 package. The 80dB to 65dB PSRR at 120Hz makes it suitable for post-rectifier filtering in linear supplies where ripple rejection matters. The adjustable output from 1.25V to 37V covers common analog rails (1.8V, 2.5V, 3.3V, 5V, 12V) with a single BOM line item. The 1.5A current rating is continuous at the output — derate above room temperature per the SOT-223-4 thermal resistance. PSRR of 80dB at 120Hz drops to 65dB at the same frequency under load; this is typical for a three-terminal regulator and adequate for most bench supplies and audio pre-regulators, though a post-regulator LDO may be needed for sensitive ADC references. On-chip protection includes over-current limiting, thermal shutdown, and short-circuit current foldback — no external clamp diodes needed for most loads. The 0°C to 125°C operating junction range is commercial grade; the device is not rated for -40°C cold start or extended automotive under-hood use. The SOT-223-4 footprint with a large copper pad on the PCB improves heat spreading for sustained 1.5A operation. The LM317 family has been in continuous production for decades, and this SOT-223-4 variant is a current catalog item. No official successor or second-source cross-reference is carried in the listing, though the LM317 pinout is industry-standard and multiple manufacturers offer functionally identical parts in the same package.","metaTitle":"LM317EMPX/NOPB Adjustable Positive Regulator, 1.5A","metaDescription":"Texas Instruments LM317EMPX/NOPB adjustable positive voltage regulator, 1.5A output, 37V max input, PSRR 80dB ~ 65dB (120Hz).","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","PSRR":"80dB ~ 65dB (120Hz)","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"TO-261-4, TO-261AA","Product Status":"Active","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"1.5A","Base Product Number":"LM317","Protection Features":"Over Current, Over Temperature, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"0°C~125°C","Voltage - Input (Max)":"37V","Voltage Dropout (Max)":"-","Voltage - Output (Max)":"37V","Supplier Device Package":"SOT-223-4","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"1.25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.6500","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/e56db9281768e7250cecd9c037344ff0.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317EMPX%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"Is LM317EMPX/NOPB a drop-in replacement for LM317T?","answer":"No — the LM317T is in a TO-220 through-hole package, while the LM317EMPX/NOPB is in a SOT-223-4 surface-mount package. The electrical characteristics (1.5A, adjustable output, 37V max) are the same, but the footprint and thermal path differ. A board redesign is required to swap between the two."},{"question":"Does LM317EMPX/NOPB require external compensation capacitors?","answer":"Yes — like all LM317-family regulators, it needs an input bypass capacitor (typically 0.1µF to 1µF) close to the input pin and an output capacitor (1µF to 10µF) for stability. The datasheet application circuit also uses a 240Ω resistor between output and adjust pins as the minimum load to maintain regulation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM317EMPX-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/LM317EMPX-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}}