{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SG3525AN","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SG3525AN","canonicalUrl":"https://icboms.com/stmicroelectronics/SG3525AN","factsUrl":"https://icboms.com/api/mcp/products/SG3525AN","rawCanonicalId":null},"summary":{"shortDescription":"onsemi SG3525AN, PWM Controller, Step-Down, Step-Up/Step-Down, Topology Buck, Push-Pull, 100Hz ~ 400kHz, 49% Duty Cycle, 2 Outputs, 8V ~ 35V Supply, 0°C ~ 70°C, Through Hole, 16-DIP (0.300\", 7.62mm), Tube.","salesMarkdown":"## PWM controller for push-pull and buck — the 49% duty cycle ceiling The onsemi SG3525AN is a PWM controller designed for step-down, step-up/step-down, buck, and push-pull topologies. Its defining parametric limit is a 49% maximum duty cycle per output — a deliberate constraint that prevents flux walking in push-pull and half-bridge transformers by guaranteeing a dead-time gap between the two output phases. The switching frequency spans 100 Hz to 400 kHz, with a built-in clock sync pin for synchronizing multiple converters or locking to an external system clock. The controller includes soft-start and enable control features, and supports synchronous rectification. ## Obsolete — sourcing via independent distribution ## Soft start and enable — sequencing without external glue The integrated soft start ramps the duty cycle from zero on power-up, limiting inrush current and preventing output overshoot. The enable pin allows the controller to be gated by a supervisor or power-good signal, simplifying power-rail sequencing in multi-rail systems.","metaTitle":"SG3525AN PWM Controller, 49% Duty Cycle, 100Hz-400kHz","metaDescription":"SG3525AN PWM controller IC. Obsolete status. 49% max duty cycle, 100Hz-400kHz switching, soft start, 16-DIP through-hole.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"STMicroelectronics","Series":"-","Package":"Tube","Function":"Step-Down, Step-Up/Step-Down","Topology":"Buck, Push-Pull","Clock Sync":"Yes","Output Type":"Transistor Driver","Mounting Type":"Through Hole","Output Phases":"1","Package / Case":"16-DIP (0.300\\\", 7.62mm)","Product Status":"Active","lifecycle_stage":"eol_hot","Control Features":"Enable, Soft Start","Duty Cycle (Max)":"49%","Number of Outputs":"2","Serial Interfaces":"-","Base Product Number":"SG3525","Output Configuration":"Positive","Frequency - Switching":"100Hz ~ 400kHz","Operating Temperature":"0°C ~ 70°C (TA)","Synchronous Rectifier":"Yes","Supplier Device Package":"16-DIP","Voltage - Supply (Vcc/Vdd)":"8V ~ 35V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.2000","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/1230eec92d96e859a8417e6d9cf22bc4.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SG3525AN/alternatives.json"},"ai":{"faq":[{"question":"Is SG3525AN obsolete?","answer":"Yes, the SG3525AN is listed as obsolete by onsemi. There is no official direct replacement from the manufacturer."},{"question":"What is the maximum duty cycle of SG3525AN?","answer":"The maximum duty cycle per output is 49%. This dead-time gap prevents transformer saturation in push-pull and half-bridge topologies by ensuring both outputs are never on simultaneously."},{"question":"Does SG3525AN have soft start?","answer":"Yes, the SG3525AN includes a soft-start control feature that gradually increases the duty cycle at startup to limit inrush current and output overshoot."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SG3525AN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SG3525AN 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}}