{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MC34063AD","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"MC34063AD","canonicalUrl":"https://icboms.com/texas-instruments/MC34063AD","factsUrl":"https://icboms.com/api/mcp/products/MC34063AD","rawCanonicalId":null},"summary":{"shortDescription":"ON Semiconductor MC34063AD, DC-DC Switching Regulator, Step-Up/Step-Down, 1.5A Switch, 100kHz, Adjustable Output, SOIC-8, 0°C to 70°C.","salesMarkdown":"## A workhorse DC-DC controller for legacy and repair BOMs The ON Semiconductor MC34063AD is a monolithic switching regulator controller that handles step-up (boost), step-down (buck), and inverting topologies from a single 8-pin SOIC package. It integrates a 1.5 A rated switch transistor, a 100 kHz oscillator, and a temperature-compensated voltage reference — enough to build a non-isolated supply rail without an external controller IC. The adjustable output is set by two external resistors from a 1.25 V reference, and the output can be configured as positive or negative relative to the input common. The wide 3 V to 40 V input range covers 5 V, 12 V, 24 V, and 48 V bus rails common in industrial control, telecom, and automotive aftermarket equipment. ## What the 1.5 A switch rating and 100 kHz oscillator mean for your design The 1.5 A switch current is the peak current the internal transistor can handle — not the continuous output current. In a typical buck from 24 V to 5 V, expect around 500 mA to 750 mA output before the switch saturates or the thermal limit in the SOIC-8 package becomes the constraint. The 100 kHz fixed oscillator sets the inductor value; for a 5 V output at 500 mA you are looking at a 100 µH to 220 µH inductor, which keeps the board footprint manageable but limits the transient response compared to modern 500 kHz+ parts. No synchronous rectifier is built in — the freewheeling diode is external. That means efficiency tops out around 70-80% depending on the diode forward drop and the duty cycle. ## Sourcing an obsolete part — what to expect ON Semiconductor no longer manufactures this specific variant in the SOIC-8 package. For new designs, the MC34063A family is broadly second-sourced by multiple manufacturers (Texas Instruments, STMicroelectronics, Microchip) in PDIP-8 and SOIC-8 packages, though pin compatibility varies by vendor. If you are filling a repair or retrofit BOM, the MC34063AD is the exact SOIC-8 variant to match the original board layout.","metaTitle":"MC34063AD DC-DC Converter, 1.5A Switch, 100kHz, SOIC-8","metaDescription":"MC34063AD step-up/step-down switching regulator. 1.5A switch, 100kHz, adjustable output, SOIC-8.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["DC-DC Power Modules"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tube","Function":"Step-Up, Step-Down","Topology":"Buck, Boost","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Active","lifecycle_stage":"eol_hot","Current - Output":"1.5A (Switch)","Number of Outputs":"1","Base Product Number":"MC34063","Output Configuration":"Positive or Negative","Frequency - Switching":"100kHz","Operating Temperature":"0°C~70°C(TA)","Synchronous Rectifier":"No","Voltage - Input (Max)":"40V","Voltage - Input (Min)":"3V","Voltage - Output (Max)":"40V (Switch)","Supplier Device Package":"8-SOIC","Voltage - Output (Min/Fixed)":"1.25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7100","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/4e044b587f1f11d06da1dc60b5c13058.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/MC34063AD/alternatives.json"},"ai":{"faq":[{"question":"Is MC34063AD obsolete or still active?","answer":"The MC34063AD is listed as Obsolete. ON Semiconductor no longer produces this exact SOIC-8 variant."},{"question":"Can MC34063AD be used for a 5V to 12V boost converter?","answer":"Yes. The MC34063AD supports boost topology with an adjustable output. For a 5 V input to 12 V output at around 300 mA to 400 mA, it is a well-documented application. The 100 kHz switching frequency requires a 100 µH to 220 µH inductor and a Schottky diode rated for the peak switch current."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/MC34063AD","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/MC34063AD when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}