{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"L7905ACV","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"L7905ACV","canonicalUrl":"https://icboms.com/stmicroelectronics/L7905ACV","factsUrl":"https://icboms.com/api/mcp/products/L7905ACV","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics L7905ACV, negative fixed-output linear regulator, -5V, 1.5A, 60dB PSRR (120Hz), TO-220-3 through-hole package, 0°C to 125°C operating range.","salesMarkdown":"The L7905ACV is a fixed-output negative linear regulator delivering -5V at up to 1.5A from a negative input rail as low as -35V. It is the negative complement to the more common 78xx positive regulators — where a design needs a clean -5V supply for op-amp rails, RS-232 transceivers, or bipolar ADC references, this part fills that slot. The TO-220-3 package with its metal tab is designed to be bolted to a heatsink; without one, the 1.4V dropout at 1A (typical) multiplied by load current means the tab temperature climbs fast. ## 60 dB PSRR at 120 Hz — cleaning up the bulk DC bus The 60 dB power-supply rejection ratio at 120 Hz is the figure that matters for rectified mains ripple. A full-wave bridge feeding a bulk capacitor leaves 100/120 Hz ripple on the unregulated DC bus; 60 dB attenuation knocks that ripple down by a factor of 1000. For a 1 Vpp ripple on the input, the output sees roughly 1 mVpp — adequate for most analog and logic loads. The PSRR rolls off above the line-frequency band, so high-frequency noise on the input rail needs a separate LC filter or post-regulator stage. ## 1.5 A output current — thermal budget at the tab The 1.5 A output current rating is the maximum at the device level, but the real limit is thermal. With a 1.4 V dropout at 1 A, the power dissipated is 1.4 W before the load draws any current. In a 25°C ambient with no heatsink, the junction-to-ambient thermal resistance of a TO-220 (~65°C/W) means the die temperature hits 125°C at roughly 1.5 W — so at 1 A output the margin is tight. A heatsink with 10-15°C/W thermal resistance is typical for continuous 1 A operation. The built-in over-temperature and short-circuit protection prevent catastrophic failure if the load faults, but the protection threshold is a thermal shutdown, not a current foldback — the part cycles on and off until the fault clears. The through-hole TO-220 package also means it is straightforward to hand-assemble or rework in prototype runs. ## Commercial temperature grade — indoor and bench use The lower bound at 0°C means the part is not rated for cold-start conditions below freezing — outdoor telecom cabinets, unheated enclosures, or automotive under-hood environments are outside its specified range. For indoor power supplies, bench instruments, and controlled-temperature industrial racks, the 125°C upper limit with proper heatsinking is adequate.","metaTitle":"STMicroelectronics L7905ACV -5V Fixed Negative Linear","metaDescription":"ST L7905ACV fixed -5V output, 1.5A negative linear regulator in TO-220-3. 60dB PSRR at 120Hz, over-temp and short-circuit protection. Active lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"STMicroelectronics","PSRR":"60dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Fixed","Mounting Type":"Through Hole","Package / Case":"TO-220-3","Product Status":"Active","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"1.5A","Base Product Number":"L7905","Protection Features":"Over Temperature, Short Circuit","Number of Regulators":"1","Output Configuration":"Negative","Operating Temperature":"0°C~125°C","Voltage - Input (Max)":"-35V","Voltage Dropout (Max)":"1.4V @ 1A (Typ)","Voltage - Output (Max)":"-","Supplier Device Package":"TO-220","Current - Quiescent (Iq)":"3 mA","Voltage - Output (Min/Fixed)":"-5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9100","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/4a87a5f6b9196945a1609d3bb8d1cd45.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is L7905ACV a direct replacement for L7905CV?","answer":"The L7905ACV and L7905CV share the same base product number L7905 and the same fixed -5V output. The 'A' suffix typically indicates a tighter output voltage tolerance or an improved specification variant. Pin-for-pin compatibility is expected across the L7905 family in the same TO-220 package, but confirm the tolerance grade against your design's requirement before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/L7905ACV","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/L7905ACV when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T18:23:37.877Z","lastPublished":"2026-07-16T18:23:37.877Z","indexable":true}}