{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM337KC","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM337KC","canonicalUrl":"https://icboms.com/texas-instruments/LM337KC","factsUrl":"https://icboms.com/api/mcp/products/LM337KC","rawCanonicalId":null},"summary":{"shortDescription":"LM337KC, negative adjustable voltage regulator, 1.5A output, -1.2V to -37V range, 77dB PSRR at 120Hz, TO-220-3 through-hole package, 0°C to 125°C operating temperature.","salesMarkdown":"## Negative rail workhorse — what the LM337KC delivers The LM337KC is a three-terminal negative adjustable voltage regulator from the LM337 family, delivering up to 1.5 A output current with an adjustable output range from -1.2 V down to -37 V. It provides 77 dB of power supply rejection at 120 Hz, attenuating ripple from a full-wave rectified mains supply. The TO-220-3 through-hole package allows direct mounting to a heatsink with a single screw, and the tab is the output pin — keep that in mind when designing the thermal interface and the PCB layout. ## Setting the output voltage — the two-resistor divider Like the standard LM337, the KC variant uses an external resistor divider between the output and adjust pins to set the negative output voltage. The minimum output is -1.2 V, the maximum is -37 V, limited by the -40 V maximum input rating. The single regulator channel means one negative rail per device — for dual-polarity supplies you pair it with a positive regulator. Built-in over-temperature shutdown and short-circuit protection are included — the regulator survives an output short indefinitely at room temperature, but thermal cycling from repeated faults can stress the die attach in the TO-220 package. ## Sourcing an obsolete part — what to expect For a drop-in replacement, look for any TO-220-3 negative adjustable regulator with the same pinout (adj, output, input from left to right with the tab as output) and matching -1.2 V to -37 V range at 1.5 A — several second-source manufacturers still produce the LM337 in this package.","metaTitle":"LM337KC Negative Adjustable Regulator, -1.2V to -37V, 1.5A","metaDescription":"LM337KC negative adjustable voltage regulator, 1.5A output, -1.2V to -37V range, 77dB PSRR at 120Hz. TO-220-3 through-hole.","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":"$0.5900","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/8270dc2f1113b75c824a9330ade9fadb.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM337KC/alternatives.json"},"ai":{"faq":[{"question":"What is the maximum current of LM337KC?","answer":"The LM337KC is rated for 1.5 A output current. Actual deliverable current depends on the input-to-output differential voltage and heatsinking — the TO-220 package requires a heatsink above about 1 A to stay within the 125°C maximum junction temperature."},{"question":"What is LM337KC's PSRR?","answer":"The LM337KC provides 77 dB of power supply rejection at 120 Hz, which attenuates full-wave rectified mains ripple by roughly 7000:1 — sufficient for clean analog supplies in audio and instrumentation circuits."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM337KC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM337KC 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}}