{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM337KCE3","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM337KCE3","canonicalUrl":"https://icboms.com/texas-instruments/LM337KCE3","factsUrl":"https://icboms.com/api/mcp/products/LM337KCE3","rawCanonicalId":null},"summary":{"shortDescription":"LM337KCE3, negative adjustable voltage regulator, 1.5A output, -40V max input, -1.2V to -37V output range, PSRR 77dB at 120Hz, TO-220-3 package, 0°C~125°C operating temperature.","salesMarkdown":"## Negative rail workhorse — now on the last-time-buy list The LM337KCE3 is a negative adjustable voltage regulator in a TO-220-3 through-hole package, delivering up to 1.5 A output with an input range down to -40 V and an adjustable output from -1.2 V down to -37 V. It is the negative complement to the LM317 positive regulator family, used wherever a clean, adjustable negative rail is needed — bipolar op-amp supplies, audio preamp rails, or industrial control loops that require a symmetrical supply. The PSRR of 77 dB at 120 Hz means it rejects full-wave rectifier ripple well enough to feed sensitive analog stages without a post-filter. The 1.5 A output current is continuous — derate it if the input-output differential exceeds about 15 V at elevated ambient, because the TO-220 tab is the only thermal path. The -40 V maximum input gives headroom for unregulated negative rails from -30 V transformer-rectifier stages; the -37 V maximum output covers the full -5 V, -12 V, -15 V, and -24 V common rail voltages. Built-in over-temperature and short-circuit protection means the regulator survives a hard output short without external clamp diodes, as long as the junction stays within the 125°C ceiling. This is a commercial-grade part — it does not carry the -40°C low-end rating needed for automotive under-hood, outdoor telecom cabinets, or cold-start industrial environments. If the design must start at -40°C, this is not the right variant. The 125°C upper limit is junction temperature, not ambient; with 1.5 A load and a high input-output differential, the junction will hit that ceiling well below a 125°C ambient, so a heatsink is mandatory for any continuous load above a few hundred milliamps.","metaTitle":"LM337KCE3 Negative Adjustable Regulator, 1.5A TO-220-3","metaDescription":"LM337KCE3 negative adjustable voltage regulator, 1.5A output, -40V max input, PSRR 77dB at 120Hz, TO-220-3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","PSRR":"77dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Adjustable","Mounting Type":"Through Hole","Package / Case":"TO-220-3","Product Status":"Obsolete","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":"0°C~125°C","Voltage - Input (Max)":"-40V","Voltage Dropout (Max)":"-","Voltage - Output (Max)":"-37V","Supplier Device Package":"TO-220-3","Voltage - Output (Min/Fixed)":"-1.2V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7200","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/8270dc2f1113b75c824a9330ade9fadb.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM337KCE3/alternatives.json"},"ai":{"faq":[{"question":"What is LM337KCE3's PSRR rating?","answer":"The PSRR is 77 dB at 120 Hz. This is the ripple rejection at the full-wave rectifier fundamental frequency — it tells you how much of the input ripple (from a 60 Hz or 50 Hz mains rectifier) the regulator attenuates before it reaches the output. 77 dB means the output ripple is roughly 14,000 times smaller than the input ripple at that frequency, which is sufficient for most analog and audio supply rails without an additional LC filter stage."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM337KCE3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM337KCE3 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}}