{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"VIPER35LD","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"VIPER35LD","canonicalUrl":"https://icboms.com/stmicroelectronics/VIPER35LD","factsUrl":"https://icboms.com/api/mcp/products/VIPER35LD","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics VIPER35LD offline flyback switcher, 22 W output power, 800 V breakdown, 136 kHz fixed switching frequency, 16-SOIC package, surface mount, active production.","salesMarkdown":"## Flyback switcher for 22 W isolated supplies The VIPER35LD is an offline flyback switching regulator with an integrated 800 V power MOSFET, rated for 22 W output power in a flyback topology. It operates from a Vcc supply range of 8.5 V to 23.5 V and starts up at 14 V, suiting universal AC input designs with a properly sized transformer. The 136 kHz fixed switching frequency balances transformer size against switching losses, while the integrated fault protections — current limiting, over-temperature, over-voltage, and short-circuit — reduce external component count for compact PSU layouts. ## Package and thermal considerations for 16-SOIC Housed in a 16-SOIC package (0.154\", 3.90 mm width), the VIPER35LD is a surface-mount part that reflows on standard solder profiles. The supplier device package is 16-SO, and the narrow body width keeps the footprint compact — expect to use a 4-layer PCB for adequate copper area on the drain-connected paddle to dissipate heat at full 22 W load. Derating the output power above 100°C ambient is recommended based on the thermal resistance of the 16-SOIC package. The base product number is VIPER35, indicating this LD variant is a standard surface-mount version within the VIPER35 family. The 16-SO package is widely sourced through distribution channels.","metaTitle":"VIPER35LD STMicroelectronics Offline Flyback Switcher 22W","metaDescription":"VIPER35LD offline flyback switcher IC, 22W output, 800V breakdown, 136kHz fixed frequency, 16-SOIC package. Active production, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"STMicroelectronics","Series":"-","Package":"Tube","Topology":"Flyback","Duty Cycle":"-","Mounting Type":"Surface Mount","Power (Watts)":"22 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, Over Voltage, Short Circuit","Output Isolation":"Isolated","Internal Switch(s)":"Yes","Voltage - Start Up":"14 V","Base Product Number":"VIPER35","Voltage - Breakdown":"800V","Frequency - Switching":"136kHz","Operating Temperature":"-40°C~150°C(TJ)","Supplier Device Package":"16-SO","Voltage - Supply (Vcc/Vdd)":"8.5V ~ 23.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.7300","priceTiers":[{"qty":1,"price":"$1.73000","currency":"USD"},{"qty":10,"price":"$1.54400","currency":"USD"},{"qty":25,"price":"$1.46560","currency":"USD"},{"qty":100,"price":"$1.20390","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/cb6e35b910edac381df5b08dea584911.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/VIPER35LD/alternatives.json"},"ai":{"faq":[{"question":"What is the typical application for VIPER35LD?","answer":"The VIPER35LD is designed for offline flyback converters delivering up to 22 W with output isolation. Typical applications include auxiliary power supplies for industrial controls, smart meters, home appliances, and AC-DC adapters where a compact, protected switcher is needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/VIPER35LD","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/VIPER35LD 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}}