{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"L78L12ABZ-AP","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"L78L12ABZ-AP","canonicalUrl":"https://icboms.com/stmicroelectronics/L78L12ABZ-AP","factsUrl":"https://icboms.com/api/mcp/products/L78L12ABZ-AP","rawCanonicalId":null},"summary":{"shortDescription":"ST L78L12ABZ-AP, positive fixed linear regulator, 12 V output, 100 mA, TO-92-3 through hole, PSRR 42 dB (120 Hz), Tape & Box.","salesMarkdown":"## 12 V fixed rail, 100 mA capacity, TO-92-3 The ST L78L12ABZ-AP is a positive fixed linear regulator delivering a 12 V output at up to 100 mA. It comes in the TO-92-3 through-hole package with formed leads, a staple for low-power board-level regulation. Input voltage tolerance goes to 35 V max, giving enough headroom for unregulated supplies or multi-rail designs without a pre-regulator. ## PSRR and quiescent draw Power supply rejection ratio is 42 dB at 120 Hz — this is the ripple attenuation the regulator provides from the input to the output at full-wave rectifier frequency. For a 1 Vpp ripple on the input, the output sees roughly 8 mVpp, which keeps downstream analog or logic rails clean enough for most mixed-signal boards. Quiescent current is 6 mA typical (6.5 mA max supply current), so the regulator's own draw is a small fraction of the 100 mA output budget — relevant for always-on circuits where every milliamp counts. ## Protection and temperature range Built-in protection covers over-current, over-temperature, and short-circuit conditions — the regulator survives an output short indefinitely without external clamp diodes in most applications. Operating temperature spans -40°C to 125°C, making it suitable for industrial enclosures and automotive-adjacent environments where the ambient sees wide swings. ## Active lifecycle, RoHS3 compliance Product status is Active per the manufacturer, with RoHS3 compliance confirmed. Available in Tape & Box (TB) or Cut Tape (CT) packaging, the TO-92-3 body fits standard 0.1-inch pitch prototyping boards and production through-hole layouts alike.","metaTitle":"ST L78L12ABZ-AP 12V 100mA Linear Regulator, TO-92-3","metaDescription":"Active ST L78L12ABZ-AP, 12V fixed output, 100mA, TO-92-3, PSRR 42dB at 120Hz. RoHS3 compliant. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"PSRR":"42dB (120Hz)","Package":"Tape & Box (TB); Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Through Hole","Package / Case":"TO-226-3, TO-92-3 (TO-226AA) Formed Leads","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)":"35V","Current - Supply (Max)":"6.5 mA","Supplier Device Package":"TO-92-3","Current - Quiescent (Iq)":"6 mA","Voltage - Output (Min/Fixed)":"12V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.54","priceTiers":[{"qty":1,"price":"$0.54000","currency":"USD"},{"qty":10,"price":"$0.43600","currency":"USD"},{"qty":25,"price":"$0.39920","currency":"USD"},{"qty":100,"price":"$0.29710","currency":"USD"},{"qty":250,"price":"$0.26928","currency":"USD"},{"qty":500,"price":"$0.22286","currency":"USD"},{"qty":1000,"price":"$0.16714","currency":"USD"},{"qty":2000,"price":"$0.15330","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/49a5b1e05533ceae40201a09eef4c29f.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/L78L12ABZ-AP/alternatives.json"},"ai":{"faq":[{"question":"What is L78L12ABZ-AP's PSRR value and why does it matter?","answer":"PSRR is 42 dB at 120 Hz. This means the regulator attenuates input ripple at the full-wave rectifier frequency by a factor of about 126×, keeping the 12 V output clean for sensitive loads."},{"question":"Will L78L12ABZ-AP drop into a board designed for L78L12ACZ-TR?","answer":"Yes — both are 12 V fixed-output, 100 mA regulators in the same TO-92-3 footprint. The pinout and electrical specs are functionally identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/L78L12ABZ-AP","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/L78L12ABZ-AP 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}}