{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"VIPER37LDTR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"VIPER37LDTR","canonicalUrl":"https://icboms.com/stmicroelectronics/VIPER37LDTR","factsUrl":"https://icboms.com/api/mcp/products/VIPER37LDTR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics VIPer™ plus VIPER37LDTR, offline flyback switching regulator, 20 W output, 800 V breakdown, 60 kHz, 16-SOIC package, surface mount.","salesMarkdown":"## 20 W isolated flyback with 800 V avalanche-rugged MOSFET The STMicroelectronics VIPER37LDTR is an offline flyback switching regulator from the VIPer™ plus family, integrating an 800 V avalanche-rugged power MOSFET and PWM controller in a 16-SOIC package. It delivers up to 20 W of continuous output power in an isolated flyback topology, switching at 60 kHz. The controller includes built-in fault protection — current limiting, over-temperature shutdown, and over-voltage protection — reducing external component count for a compact PSU design. ## Breakdown voltage and switching frequency — sizing the transformer The 800 V breakdown rating on the integrated MOSFET handles reflected voltage and leakage inductance spikes in universal AC input flyback designs. At 60 kHz, the switching frequency is a practical compromise between transformer size and switching losses — the core volume can be kept moderate while staying below the EMI quasi-peak limit without heavy filtering. The 80 % maximum duty cycle supports a wide input-voltage range and keeps secondary-side voltage stress manageable in a standard flyback. ## Junction temperature and supply range — where it runs The 150°C TJ max allows the part to run at full 20 W output without forced cooling in many sealed PSUs. The Vcc supply range of 8.5 V to 23.5 V gives the auxiliary winding plenty of headroom, and the 14 V start-up threshold ensures clean turn-on even with a slow-rising bulk capacitor.","metaTitle":"STMicroelectronics VIPER37LDTR VIPer™ plus Flyback, 20 W","metaDescription":"ST VIPER37LDTR offline flyback switcher, 20 W output, 800 V breakdown, 60 kHz. Active lifecycle, 16-SOIC.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"STMicroelectronics","Series":"VIPer™ plus","Package":"Tape & Reel (TR); Cut Tape (CT)","Topology":"Flyback","Duty Cycle":"80%","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, Over Voltage","Output Isolation":"Isolated","Internal Switch(s)":"Yes","Voltage - Start Up":"14 V","Base Product Number":"VIPER37","Voltage - Breakdown":"800V","Frequency - Switching":"60kHz","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":"$0.8641","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/0f043aa7443060a44c614782cc666764.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/VIPER37LDTR/alternatives.json"},"ai":{"faq":[{"question":"What is the output power of VIPER37LDTR?","answer":"The VIPER37LDTR is rated for 20 W continuous output power in an isolated flyback topology. The actual deliverable power depends on the transformer design, ambient temperature, and cooling."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/VIPER37LDTR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/VIPER37LDTR 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}}