{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"L78M12CV-DG","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"L78M12CV-DG","canonicalUrl":"https://icboms.com/stmicroelectronics/L78M12CV-DG","factsUrl":"https://icboms.com/api/mcp/products/L78M12CV-DG","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics L78M12CV-DG positive fixed linear regulator, 12V output, 500mA, TO-220-3 through-hole, 55dB PSRR at 120Hz, active production.","salesMarkdown":"## Active production — what it means for the BOM line STMicroelectronics lists the L78M12CV-DG lifecycle stage as current — no end-of-life notice, no last-time-buy window. This is a part you can still specify into a new design or order as a replacement without worrying about a PCN closing the supply window. ROHS3 compliant, so it passes the environmental gate for EU and North American markets without an exemption certificate. ## 12V rail at 500mA — the fit decision Fixed 12V output, 500mA maximum continuous current. For a 12V logic or analog rail, this is the standard TO-220 three-terminal regulator — the same pinout as the 1A 78M12 and 2A L78S12CV, but in the 500mA-rated die. Input voltage max is 35V, so a 12V rail derived from a 24V DC supply or a 12VAC rectified to ~17V sits well within the dropout headroom. The 6 mA quiescent current is the standing draw — negligible on a powered rail but worth budgeting on a battery-backed 12V bus. On a 12V rail fed from a 50/60Hz transformer, the residual ripple at the output is roughly 1.8 mV per volt of input ripple — clean enough for most analog and digital loads without a post-filter. ## TO-220 — the scorch-mark tells you TO-220-3 through-hole package, the same footprint as every 78xx-series regulator since the 1970s. If you are reworking a board and the scorch mark is on the tab of a three-pin device in the 12V position, this is the part that died — and the replacement drops straight in. Built-in over-current, over-temperature, and short-circuit protection. That behaviour is the failure signature you see on a scope. ## Peer drop-in — what swaps without rewiring The L78M09CV (9V output, same 500mA, same TO-220) shares the same pinout and package. If a board was built around the 9V version and you need 12V, the L78M12CV-DG drops into the same footprint — no layout change, just the output voltage difference. The L78S12CV is the 2A sibling in the same TO-220 package. Same 12V output, same pinout, but double the current capability. If the original design used the 500mA part and the rail is marginal, the 2A version is a pin-compatible upgrade without a board spin.","metaTitle":"STMicroelectronics L78M12CV-DG 12V 500mA Linear Regulator","metaDescription":"ST L78M12CV-DG fixed 12V output, 500mA, TO-220-3. Active production. 55dB PSRR at 120Hz. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"PSRR":"55dB (120Hz)","Package":"Tube","Output Type":"Fixed","Mounting Type":"Through Hole","Package / Case":"TO-220-3","lifecycle_stage":"eol_hot","Current - Output":"500mA","Protection Features":"Over Current, Over Temperature, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"0°C ~ 150°C","Voltage - Input (Max)":"35V","Supplier Device Package":"TO-220","Current - Quiescent (Iq)":"6 mA","Voltage - Output (Min/Fixed)":"12V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.92","priceTiers":[{"qty":1,"price":"$0.92000","currency":"USD"},{"qty":10,"price":"$0.82400","currency":"USD"},{"qty":25,"price":"$0.78240","currency":"USD"},{"qty":100,"price":"$0.64270","currency":"USD"},{"qty":250,"price":"$0.60076","currency":"USD"},{"qty":500,"price":"$0.53090","currency":"USD"},{"qty":1000,"price":"$0.46130","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/b14bc31fbed4d5d7828d19983fc0d5e4.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/L78M12CV-DG/alternatives.json"},"ai":{"faq":[{"question":"What is the PSRR of L78M12CV-DG and why does it matter?","answer":"55dB at 120Hz. On a 12V rail from a transformer supply, the output ripple stays under a few millivolts."},{"question":"Will L78M12CV-DG drop into a board that was specified around L78M09CV?","answer":"Yes — same TO-220-3 pinout, same 500mA rating. The only difference is the fixed output voltage: 12V vs 9V. No footprint or mounting change needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/L78M12CV-DG","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/L78M12CV-DG 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}}