{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"L7905ACD2T","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"L7905ACD2T","canonicalUrl":"https://icboms.com/stmicroelectronics/L7905ACD2T","factsUrl":"https://icboms.com/api/mcp/products/L7905ACD2T","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics L7905ACD2T, fixed negative voltage regulator, -5V output, 1.5A, D2PAK surface mount, 60dB PSRR at 120Hz, 0°C to 125°C operating temperature.","salesMarkdown":"## -5 V fixed negative rail in a D2PAK tabbed package The STMicroelectronics L7905ACD2T is a fixed-output negative voltage regulator delivering -5 V at up to 1.5 A. It is a three-terminal device in the D2PAK (TO-263-3) surface-mount package, where the exposed tab is both the thermal pad and the negative output node. The part is intended for negative-rail generation in systems that need a clean, regulated -5 V from an unregulated negative input down to -35 V. ## 60 dB ripple rejection at 120 Hz — what it means for analog rails The L7905ACD2T specifies a PSRR of 60 dB at 120 Hz, which is the typical rectified line frequency. That level of ripple rejection means the output sees roughly 1 mV of ripple for every 1 V of input ripple at that frequency — adequate for powering op-amp rails or ADC reference buffers in industrial control boards where the negative supply is derived from a transformer-and-rectifier stage. For switching regulators upstream, the 120 Hz figure is less relevant; you are looking at the PSRR roll-off above a few kHz, which is not specified here. ## Obsolete — sourcing through independent distribution The L7905ACD2T carries an Obsolete lifecycle status. ## Protection features and quiescent draw Built-in over-temperature and short-circuit protection are included, which is standard for this regulator family. The quiescent current is 3 mA — not a low-Iq part, but acceptable for a linear regulator driving a 1.5 A load where the 3 mA overhead is negligible compared to the load current. The typical dropout voltage is 1.4 V at 1 A load, so the input must stay below -6.4 V to maintain regulation at full current.","metaTitle":"STMicroelectronics L7905ACD2T -5V Fixed Negative Regulator","metaDescription":"STMicroelectronics L7905ACD2T negative voltage regulator, fixed -5V output, 1.5A, D2PAK surface mount. PSRR 60dB at 120Hz.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"STMicroelectronics","PSRR":"60dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-263-3, D²Pak (2 Leads + Tab), TO-263AB","Product Status":"Obsolete","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":"D2PAK","Current - Quiescent (Iq)":"3 mA","Voltage - Output (Min/Fixed)":"-5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9200","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/4a87a5f6b9196945a1609d3bb8d1cd45.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to L7905ACD2T?","answer":"No official second-source or pin-compatible alternative is listed on the record. The L7905 series includes other fixed-voltage variants (e.g., -12 V, -15 V), but those differ in output voltage and are not drop-in replacements for a -5 V rail. For a -5 V fixed regulator in D2PAK, you would need to evaluate parts from other manufacturers based on pinout and thermal pad compatibility — the D2PAK footprint is standard, but the pin assignment (input, ground, output) must be confirmed against the candidate part's datasheet."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/L7905ACD2T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/L7905ACD2T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T17:37:55.208Z","lastPublished":"2026-07-16T17:37:55.208Z","indexable":true}}