{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM337IMP","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM337IMP","canonicalUrl":"https://icboms.com/texas-instruments/LM337IMP","factsUrl":"https://icboms.com/api/mcp/products/LM337IMP","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM337IMP, negative adjustable voltage regulator, 1.5 A output, -1.2 V to -37 V range, PSRR 60 dB at 120 Hz, SOT-223-4 surface-mount package, -40°C to 125°C operating temperature.","salesMarkdown":"## Negative rail workhorse in a small footprint The LM337IMP is a negative adjustable voltage regulator from Texas Instruments, delivering up to 1.5 A output current with an output range from -1.2 V down to -37 V. It is the negative complement to the LM317 positive regulator family, designed for generating clean negative supply rails in industrial and telecom equipment. The SOT-223-4 surface-mount package (TO-261-4) saves board area compared to the TO-220 through-hole version, though the thermal dissipation limit is lower — the 1.5 A rating assumes adequate copper area on the PCB for heat sinking. ## NRND — plan for a last-time buy or alternate This means Texas Instruments will continue to support existing production for a defined window, but the part is on a path toward end-of-life. For new designs, a pin-compatible alternate within the LM337 family should be evaluated. The PSRR is specified at 60 dB at 120 Hz — this is the ripple rejection from the input to the output at the full-wave rectifier fundamental frequency. For a -5 V rail powering an op-amp or ADC reference, 60 dB means the 120 Hz ripple on the unregulated input is attenuated by a factor of 1000, keeping the output clean enough for most analog circuits. The built-in over-temperature and short-circuit protection prevent damage under fault conditions, though the thermal shutdown threshold is set to protect the die, not the load — a sustained short at 1.5 A will cycle the part on and off. ## Temperature range and package — industrial deployment For 1.5 A continuous output with a high input-to-output differential, a minimum of 1 square inch of 2-oz copper on the top layer is recommended to keep the junction below 125°C.","metaTitle":"LM337IMP Negative Adjustable Regulator, 1.5 A, SOT-223, NRND","metaDescription":"LM337IMP negative adjustable voltage regulator, 1.5 A output, -1.2 V to -37 V, PSRR 60 dB at 120 Hz, SOT-223-4, -40°C to 125°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","PSRR":"60dB (120Hz)","Series":"-","Packaging":"Tape & Reel (TR) Cut Tape (CT)","Output Type":"Adjustable","Part Status":"Obsolete","Mounting Type":"Surface Mount","Package / Case":"TO-261-4, TO-261AA","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"1.5A","Base Product Number":"LM337","Protection Features":"Over Temperature, Short Circuit","Number of Regulators":"1","Output Configuration":"Negative","Operating Temperature":"-40°C ~ 125°C","Voltage - Input (Max)":"-40V","Voltage Dropout (Max)":"-","Voltage - Output (Max)":"-37V","Supplier Device Package":"SOT-223-4","Voltage - Output (Min/Fixed)":"-1.2V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.0600","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/0778c63670ae2b9da77d4109fe26090b.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM337IMP/alternatives.json"},"ai":{"faq":[{"question":"Is LM337IMP obsolete?","answer":"It is not yet fully discontinued, but it is on a path toward end-of-life. Existing production is supported for a limited window; for new designs, evaluate a pin-compatible alternate within the LM337 family."},{"question":"What is the replacement for LM337IMP?","answer":"The LM337 family includes several pin-compatible surface-mount variants (e.g., LM337M in D2PAK, LM337 in SOT-223 from other manufacturers) that can be evaluated as drop-in replacements. Confirm the output current, package footprint, and temperature grade against your BOM requirements."},{"question":"What is the difference between LM337IMP and LM337T?","answer":"The LM337IMP is the surface-mount SOT-223-4 version, while the LM337T is the through-hole TO-220 version. The TO-220 package handles higher power dissipation due to its larger tab and ability to mount a heatsink; the SOT-223 is limited to lower continuous current at high input-output differentials. Electrical specifications (output voltage range, current limit, PSRR) are similar across the family."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM337IMP","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM337IMP 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}}