{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"L78L24ACUTR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"L78L24ACUTR","canonicalUrl":"https://icboms.com/stmicroelectronics/L78L24ACUTR","factsUrl":"https://icboms.com/api/mcp/products/L78L24ACUTR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics L78L24ACUTR positive fixed linear regulator, 24V output, 100mA, SOT-89-3 surface mount, 40V max input, 37dB PSRR at 120Hz.","salesMarkdown":"## Fixed 24V rail for analog and bias supplies The L78L24ACUTR is a positive fixed linear regulator delivering 24 V output at up to 100 mA from a SOT-89-3 package. It accepts a maximum input of 40 V, giving roughly 16 V of headroom above the regulated rail — enough to ride through ripple on a loosely regulated 28 V or 36 V bus without dropping out. The 37 dB PSRR at 120 Hz means the output attenuates full-wave-rectified ripple by about 70× — relevant when the supply comes from a mains-frequency transformer and bridge rectifier, where 120 Hz is the dominant noise component. ## What the ratings mean for the BOM line With a 6 mA quiescent current (Iq), the regulator's own draw is a fixed overhead on the input rail regardless of load — at light loads like a 10 mA sensor bias, the Iq represents 37% of the total input current, so the efficiency is low, but that is typical for a linear regulator in this class. Built-in protection against over-current, over-temperature, and short-circuit means the regulator folds back or shuts down before damaging itself — useful when the downstream load is a capacitor bank that draws inrush at power-up. The 0°C lower operating limit means no special cold-start handling, but the tab's solder joint should be inspected for voiding if the regulator runs near its 100 mA limit continuously. No stock-holding claim; each order is quoted individually.","metaTitle":"STMicro L78L24ACUTR 24V Fixed Linear Regulator","metaDescription":"STMicro L78L24ACUTR positive fixed linear regulator, 24V output at 100mA, SOT-89-3. Active production, ROHS3 compliant. PSRR 37dB at 120Hz.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"PSRR":"37dB (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":"0°C ~ 125°C","Voltage - Input (Max)":"40V","Current - Supply (Max)":"6.5 mA","Supplier Device Package":"SOT-89-3","Current - Quiescent (Iq)":"6 mA","Voltage - Output (Min/Fixed)":"24V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.66","priceTiers":[{"qty":1,"price":"$0.66000","currency":"USD"},{"qty":10,"price":"$0.58200","currency":"USD"},{"qty":25,"price":"$0.54680","currency":"USD"},{"qty":100,"price":"$0.44630","currency":"USD"},{"qty":250,"price":"$0.41452","currency":"USD"},{"qty":500,"price":"$0.35276","currency":"USD"},{"qty":1000,"price":"$0.29120","currency":"USD"},{"qty":2500,"price":"$0.29120","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/49a5b1e05533ceae40201a09eef4c29f.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/L78L24ACUTR/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the L78L24ACUTR and get a price?","answer":"We source the L78L24ACUTR through independent distribution and quote it to order against your RFQ."},{"question":"What is the PSRR of the L78L24ACUTR?","answer":"The power supply rejection ratio is 37 dB at 120 Hz, which attenuates ripple from a full-wave rectified input by roughly 70×. This is the figure to use when estimating output ripple from a mains-frequency supply."},{"question":"What package does the L78L24ACUTR come in?","answer":"The package tab is the output pin and serves as the primary thermal path to the PCB."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/L78L24ACUTR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/L78L24ACUTR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}