{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"VIPER26HD","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"VIPER26HD","canonicalUrl":"https://icboms.com/stmicroelectronics/VIPER26HD","factsUrl":"https://icboms.com/api/mcp/products/VIPER26HD","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics VIPer™ plus series, VIPER26HD, offline flyback switcher with 800 V breakdown MOSFET, 20 W output power, 115 kHz fixed switching frequency, 70% duty cycle, 16-SOIC package.","salesMarkdown":"## What the 800 V MOSFET and 20 W ceiling mean for your supply The VIPER26HD integrates an 800 V avalanche-rugged MOSFET and a fixed-frequency current-mode PWM controller. That 800 V breakdown gives you headroom above a universal AC input after derating — enough to survive line surges without a separate clamping circuit. The 20 W output is the practical continuous limit for a flyback running from that rail. ## Switching frequency and duty cycle — transformer and EMI decisions The 115 kHz fixed switching frequency is high enough to shrink the flyback transformer core and reduce the output capacitor ripple current. The 70% maximum duty cycle is typical for a flyback running in continuous-conduction mode at low line — it sets the transformer turns ratio and the reflected voltage stress on the MOSFET. The part is ROHS3 compliant. ## Package and thermal — the 16-SOIC reality The 16-SOIC package with a 0.154-inch body width and exposed pad (if present on the VIPER26HD variant) is the primary heat path. At 20 W output and 85% efficiency, the internal dissipation is roughly 3.5 W. The junction-to-ambient thermal resistance of a standard SO-16 without a pad is around 70–80 °C/W — that would push Tj above 150 °C at 3.5 W in a 25 °C ambient. For a sealed adapter, plan on a smaller copper island and derate the output power accordingly.","metaTitle":"VIPER26HD STMicro VIPer™ Plus 800V Flyback 20W 16-SOIC","metaDescription":"VIPER26HD offline flyback switcher: 800V MOSFET, 20W output, 115kHz fixed frequency, 70% duty cycle. Active production, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":"VIPer™ plus","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"STMicroelectronics","Series":"VIPer™ plus","Package":"Tube","Topology":"Flyback","Duty Cycle":"70%","Mounting Type":"Surface Mount","Power (Watts)":"20 W","Package / Case":"16-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Active","lifecycle_stage":"eol_hot","Control Features":"-","Fault Protection":"Current Limiting, Over Temperature","Output Isolation":"Either","Internal Switch(s)":"Yes","Voltage - Start Up":"13 V","Base Product Number":"VIPER26","Voltage - Breakdown":"800V","Frequency - Switching":"115kHz","Operating Temperature":"-40°C ~ 150°C (TJ)","Supplier Device Package":"16-SO","Voltage - Supply (Vcc/Vdd)":"11.5V ~ 23.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.4000","priceTiers":[{"qty":1,"price":"$1.40000","currency":"USD"},{"qty":10,"price":"$1.24900","currency":"USD"},{"qty":25,"price":"$1.18560","currency":"USD"},{"qty":100,"price":"$0.97400","currency":"USD"},{"qty":250,"price":"$0.91052","currency":"USD"},{"qty":500,"price":"$0.80464","currency":"USD"},{"qty":1000,"price":"$0.63524","currency":"USD"},{"qty":2500,"price":"$0.59289","currency":"USD"},{"qty":5000,"price":"$0.56325","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/4b874ded7660cd395f5453a3691bb931.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/VIPER26HD/alternatives.json"},"ai":{"faq":[{"question":"Is VIPER26HD RoHS compliant?","answer":"Yes, it is ROHS3 compliant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/VIPER26HD","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/VIPER26HD 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}}