{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"VIPER27HN","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"VIPER27HN","canonicalUrl":"https://icboms.com/stmicroelectronics/VIPER27HN","factsUrl":"https://icboms.com/api/mcp/products/VIPER27HN","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics VIPer™ plus series, VIPER27HN offline flyback switching regulator, 20 W power rating, 800 V breakdown voltage, 115 kHz switching frequency, through-hole 7-DIP package","salesMarkdown":"## 20 W flyback with 800 V avalanche margin The VIPER27HN is a monolithic offline flyback switcher from ST's VIPer™ plus series, integrating the PWM controller and an 800 V avalanche-rated power MOSFET in a single 7-lead DIP package. ## Switching frequency and duty cycle limits The internal oscillator runs at 115 kHz, a fixed frequency that keeps the transformer core size manageable while staying below the EMI quasi-peak limit at 150 kHz. The maximum duty cycle is 80 %, which sets the primary-to-secondary turns ratio for a given input range — at universal mains the 800 V breakdown gives enough headroom to avoid avalanche stress during line transients. ## Thermal and protection envelope On-chip fault protection covers current limiting, over-temperature shutdown, and over-voltage clamping — the supply rail itself is monitored between 8.5 V and 23.5 V, with a 14 V startup threshold that ensures clean turn-on into a discharged bulk cap. The through-hole 7-DIP package is a standard, widely stocked form factor, so sourcing risk is low for both prototype and production volumes.","metaTitle":"VIPER27HN STMicroelectronics Flyback Switcher 20 W 800 V","metaDescription":"VIPER27HN offline flyback switch from STMicroelectronics VIPer plus series. 20 W power, 800 V breakdown, 115 kHz switching, through-hole 7-DIP.","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":"80%","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, Over Voltage","Output Isolation":"Isolated","Internal Switch(s)":"Yes","Voltage - Start Up":"14 V","Base Product Number":"VIPER27","Voltage - Breakdown":"800V","Frequency - Switching":"115kHz","Operating Temperature":"-40°C ~ 150°C (TJ)","Supplier Device Package":"7-DIP","Voltage - Supply (Vcc/Vdd)":"8.5V ~ 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/75c7e60c0e317137dbd262cced343818.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/VIPER27HN/alternatives.json"},"ai":{"faq":[{"question":"Can VIPER27HN be used for a 20 W flyback design?","answer":"Yes, the VIPER27HN is rated for 20 W output power in a flyback topology. The 800 V breakdown voltage and 115 kHz switching frequency are well matched to universal input (85–265 VAC) designs at that power level."},{"question":"What is the closest pin-compatible alternative to VIPER27HN in the VIPer plus series?","answer":"Within the VIPer plus family, the VIPER27LN is a surface-mount (SO-8) variant with the same 20 W rating and 800 V breakdown. For higher power, the VIPER37HN (same 7-DIP package) steps up to 30 W. Pin compatibility should be verified against the respective datasheets, as the DIP lead count differs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/VIPER27HN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/VIPER27HN 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}}