{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"VIPER26LN","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"VIPER26LN","canonicalUrl":"https://icboms.com/stmicroelectronics/VIPER26LN","factsUrl":"https://icboms.com/api/mcp/products/VIPER26LN","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics VIPer™ plus series, VIPER26LN, offline switching regulator, flyback topology, 20 W output, 800 V breakdown, 60 kHz switching, 7-DIP through-hole package.","salesMarkdown":"## Flyback converter with integrated 800 V MOSFET The VIPER26LN is a monolithic offline switcher from ST's VIPer™ plus family that integrates the PWM controller and an 800 V avalanche-rugged power MOSFET in a single 7-DIP through-hole package. It is designed for flyback converters delivering up to 20 W — think auxiliary supplies for motor drives, battery chargers, and industrial control boards where a discrete MOSFET-and-controller pair would eat board space and add BOM lines. ## 60 kHz switching, 70 % duty-cycle ceiling The fixed 60 kHz switching frequency is a pragmatic choice: fast enough to keep the flyback transformer small, slow enough to avoid the snubber losses that 100 kHz+ designs wrestle with at 20 W. The 70 % maximum duty cycle gives enough on-time for universal AC input (85–265 VAC) without saturating the core — you size the primary inductance around that duty limit, not the other way around. Start-up is handled internally with a 13 V threshold, and the supply range from 11.5 V to 23.5 V covers the Vcc rail tolerance you get from an auxiliary winding without an external linear regulator. ## Fault protection set — current limit and OTP On-chip current limiting and over-temperature shutdown mean you do not need an external sense resistor or a thermistor for basic protection. The current limit is set internally; the OTP threshold is tied to the junction temperature, so the thermal pad on the PCB (the copper area under the 7-DIP body) directly affects the power level at which the part trips. Mind the dead-time on the feedback loop — the hiccup-mode restart after a fault cycles the bias supply, and the start-up resistor must be sized to recharge the Vcc cap within the hiccup period.","metaTitle":"VIPER26LN STMicroelectronics 20 W Flyback Switching","metaDescription":"VIPER26LN from STMicroelectronics VIPer™ plus series. 800 V breakdown, 60 kHz switching, 20 W flyback with current limiting and OTP.","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":"Through Hole","Power (Watts)":"20 W","Package / Case":"8-DIP (0.300\\\", 7.62mm), 7 Leads","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":"60kHz","Operating Temperature":"-40°C ~ 150°C (TJ)","Supplier Device Package":"7-DIP","Voltage - Supply (Vcc/Vdd)":"11.5V ~ 23.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.4700","priceTiers":[{"qty":1,"price":"$1.47000","currency":"USD"},{"qty":10,"price":"$1.31700","currency":"USD"},{"qty":25,"price":"$1.24960","currency":"USD"},{"qty":100,"price":"$1.02650","currency":"USD"},{"qty":250,"price":"$0.95960","currency":"USD"},{"qty":500,"price":"$0.84800","currency":"USD"},{"qty":1000,"price":"$0.66948","currency":"USD"},{"qty":2500,"price":"$0.62485","currency":"USD"},{"qty":5000,"price":"$0.59360","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/4b874ded7660cd395f5453a3691bb931.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/VIPER26LN/alternatives.json"},"ai":{"faq":[{"question":"What is the output power of VIPER26LN?","answer":"The VIPER26LN is rated for 20 W in a flyback topology. That figure assumes adequate heatsinking and the full 70 % duty cycle; in a sealed enclosure with limited airflow, the 150 °C junction temperature limit becomes the binding constraint."},{"question":"Does VIPER26LN have overcurrent protection?","answer":"Yes, the VIPER26LN includes on-chip current limiting and over-temperature shutdown. The current limit is internally fixed; no external sense resistor is required."},{"question":"What is the difference between VIPER26LN and VIPER26LD?","answer":"The two share the same die and electrical ratings — 800 V breakdown, 60 kHz switching, 20 W output. The difference is the package: VIPER26LN is a 7-DIP through-hole, while the LD variant is a surface-mount SO-8. The pinout differs between the two packages, so they are not drop-in replacements on the same PCB footprint."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/VIPER26LN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/VIPER26LN 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}}