{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"L78L05ABUTR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"L78L05ABUTR","canonicalUrl":"https://icboms.com/stmicroelectronics/L78L05ABUTR","factsUrl":"https://icboms.com/api/mcp/products/L78L05ABUTR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics L78L05ABUTR positive fixed linear regulator, 5V output, 100mA, SOT-89-3 surface-mount package, PSRR 49dB at 120Hz, -40°C to 125°C temperature range.","salesMarkdown":"## 5V fixed rail with 49dB PSRR at line frequency The STMicroelectronics L78L05ABUTR is a fixed 5V positive-output linear regulator delivering up to 100 mA in the SOT-89-3 package. Its 49 dB PSRR at 120 Hz means the output ripple from a full-wave-rectified mains supply is attenuated by a factor of ~280 — critical when powering analog front-ends or MCU ADCs from an unregulated DC bus. ## Input range, quiescent draw, and protection Maximum input voltage is 30 V, giving 25 V of drop-out headroom above the 5 V rail — the part dissipates the difference as heat, so the 100 mA output at high input-to-output differential demands attention to the SOT-89-3's thermal pad. Quiescent current is 5.5 mA typical, with a 6 mA supply maximum; this Iq floor matters in always-on or battery-backed 5 V rails where every milliamp counts. Built-in protection covers over-current, over-temperature, and short-circuit events — the regulator survives a sustained output short without damage, though the thermal-shutdown cycle will pulse the rail. ## Package footprint and mounting Housed in a TO-243AA (SOT-89-3) surface-mount package, the L78L05ABUTR occupies a compact board footprint suited to space-constrained PSU sections. It is RoHS3 compliant, meeting the current EU restriction directive for lead and other hazardous substances.","metaTitle":"STMicroelectronics L78L05ABUTR Linear Regulator","metaDescription":"ST L78L05ABUTR 5V fixed-output linear regulator, 100mA, SOT-89-3. PSRR 49dB at 120Hz, -40 to 125°C. Active, RoHS3. Quoted per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"PSRR":"49dB (120Hz)","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-243AA","lifecycle_stage":"eol_hot","Current - Output":"100mA","Protection Features":"Over Current, Over Temperature, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C","Voltage - Input (Max)":"30V","Current - Supply (Max)":"6 mA","Supplier Device Package":"SOT-89-3","Current - Quiescent (Iq)":"5.5 mA","Voltage - Output (Min/Fixed)":"5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.08369","priceTiers":[{"qty":5,"price":"$0.08369","currency":"USD"},{"qty":50,"price":"$0.06727","currency":"USD"},{"qty":150,"price":"$0.05872","currency":"USD"},{"qty":500,"price":"$0.05178","currency":"USD"},{"qty":2500,"price":"$0.04936","currency":"USD"},{"qty":5000,"price":"$0.04774","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/49a5b1e05533ceae40201a09eef4c29f.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/L78L05ABUTR/alternatives.json"},"ai":{"faq":[{"question":"Where can I source L78L05ABUTR and get a quote for volume?","answer":"The L78L05ABUTR is sourced through authorized and independent distribution. Pricing and lead time are confirmed at RFQ against the specific BOM quantity and delivery schedule — submit a request for a current quote."},{"question":"What is the PSRR of L78L05ABUTR and why does it matter?","answer":"PSRR is 49 dB at 120 Hz. This means the regulator attenuates 120 Hz ripple from a full-wave rectified supply by roughly 280:1 — a 1 V peak-to-peak ripple on the input drops to about 3.5 mV on the output, which is clean enough for most 5 V analog and logic rails without post-filtering."},{"question":"Does L78L05ABUTR drop in as a replacement for L78L09ABD13TR?","answer":"No — the L78L05ABUTR outputs a fixed 5 V rail, while the L78L09ABD13TR outputs 9 V. Both are 100 mA positive regulators in surface-mount packages, but the output voltage difference means the board's load circuitry and input-to-output dropout margin must be re-evaluated. They are not pin-compatible substitutes without a design review."},{"question":"What compliance documentation does STMicroelectronics provide for L78L05ABUTR?","answer":"STMicroelectronics confirms RoHS3 compliance for this part number."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/L78L05ABUTR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/L78L05ABUTR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-13T09:47:13.674Z","lastPublished":"2026-08-13T09:47:13.674Z","indexable":true}}