{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM7905CT","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM7905CT","canonicalUrl":"https://icboms.com/texas-instruments/LM7905CT","factsUrl":"https://icboms.com/api/mcp/products/LM7905CT","rawCanonicalId":null},"summary":{"shortDescription":"LM7905CT, fixed -5V output negative voltage regulator, 1.5A output current, 66dB PSRR at 120Hz, TO-220-3 through-hole package, 0°C to 125°C operating temperature range.","salesMarkdown":"## Fixed -5 V negative rail — what the 1.5 A rating buys you The LM7905CT is a fixed -5 V output negative voltage regulator from the LM79xx family, delivering up to 1.5 A continuous. It is the complement to the positive LM7805, providing a clean negative rail for dual-supply op-amp circuits, bipolar ADC/DAC front-ends, or any system that needs a symmetrical supply. The dropout voltage is 1.1 V max at 1 A load, so the input must be at least -6.1 V to maintain regulation under full load. ## 66 dB PSRR — ripple rejection for analog loads With 66 dB of power-supply rejection ratio at 120 Hz, the LM7905CT attenuates full-wave-rectified ripple by a factor of roughly 2000. That matters when the negative rail feeds a precision op-amp or a low-noise sensor bias — the regulator keeps mains-frequency hum off the supply bus without an additional LC filter stage. ## TO-220-3 — heatsinking and board fit The TO-220-3 through-hole package has a metal tab that bolts to a heatsink or a chassis ground plane. For a 1.5 A load with a 3 V input-to-output differential, the regulator dissipates about 4.5 W — a TO-220 in free air cannot shed that without a heatsink. ## Obsolete — no official replacement on record For a production BOM that requires this exact negative rail, the procurement path is last-time-buy inventory or the independent surplus channel — date-code provenance and traceability matter more here than with an active part, because mystery stock surfacing years after the last buy window may be relabeled or out-of-spec.","metaTitle":"LM7905CT -5V Fixed Negative Voltage Regulator, 1.5A","metaDescription":"Obsolete LM7905CT fixed -5V output, 1.5A negative voltage regulator in TO-220-3. 66dB PSRR at 120Hz.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","PSRR":"66dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Fixed","Mounting Type":"Through Hole","Package / Case":"TO-220-3","Product Status":"Not For New Designs","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"1.5A","Base Product Number":"LM7905","Protection Features":"Over Temperature, Short Circuit","Number of Regulators":"1","Output Configuration":"Negative","Operating Temperature":"0°C~125°C","Voltage - Input (Max)":"-25V","Voltage Dropout (Max)":"1.1V @ 1A","Voltage - Output (Max)":"-","Supplier Device Package":"TO-220-3","Current - Quiescent (Iq)":"1 mA","Voltage - Output (Min/Fixed)":"-5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7900","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/c3e2b880dd5fb36800a6305ca7952ee6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM7905CT/alternatives.json"},"ai":{"faq":[{"question":"Is the LM7905CT obsolete?","answer":"Yes, the LM7905CT is listed as Obsolete. No official replacement part number has been published. Sourcing is limited to last-time-buy inventory or the independent distribution channel."},{"question":"What is the closest pin-compatible alternative to the LM7905CT?","answer":"No pin-compatible second source or manufacturer cross-reference is recorded for this specific order code. The standard LM7905 in a TO-220 package from other vendors may be functionally equivalent, but pinout and thermal pad dimensions should be verified against the original datasheet before substitution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM7905CT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM7905CT 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}}