{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STP08IE120F4","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STP08IE120F4","canonicalUrl":"https://icboms.com/stmicroelectronics/STP08IE120F4","factsUrl":"https://icboms.com/api/mcp/products/STP08IE120F4","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics ESBT® series NPN Emitter Switched Bipolar transistor, STP08IE120F4, 1200V, 8A, TO-220-4 Full Pack, Through Hole, Tube.","salesMarkdown":"## 1200 V / 8 A — the blocking voltage defines the application space The STP08IE120F4 is an NPN Emitter Switched Bipolar transistor from STMicroelectronics' ESBT® series, rated for 1200 V collector-emitter blocking and 8 A continuous current. The 1200 V rating places it in the high-voltage switching class — the part is designed for circuits where the DC bus or rectified mains sits above 600 V, such as three-phase 400 VAC input stages or PFC boost converters running a 800 V rail. ## Obsolete — last-time-buy window closed STMicroelectronics lists the STP08IE120F4 as Obsolete. ## TO-220-4 Full Pack — isolated tab, gate driver application The TO-220-4 Full Pack (TO-220FP) package has a fully isolated plastic tab — no exposed metal pad, so the heatsink does not need an insulating washer. The fourth pin is the emitter-sense connection used in the Emitter Switched topology; this pin carries the gate-drive return current and must be routed directly to the driver ground, not shared with the power emitter path. The through-hole mounting suits point-to-point or PCB layouts where a single-sided board with a large copper island serves as the heatsink. ## ESBT topology — what it changes for the gate drive The Emitter Switched Bipolar (ESBT) is a cascode: a low-voltage MOSFET drives the emitter of a high-voltage NPN bipolar. The gate drive sees the MOSFET's threshold, not the bipolar's base charge — so the driver does not need to supply continuous base current. The turn-off is faster than a standard BJT because the MOSFET opens the emitter path, sweeping stored charge out of the bipolar. The trade-off is a slightly higher on-state voltage than a single IGBT at the same current density, but the switching losses at 20-50 kHz can be lower in a properly tuned resonant or quasi-resonant topology.","metaTitle":"ST STP08IE120F4 ESBT NPN Transistor, 1200V, 8A, TO-220FP","metaDescription":"STMicroelectronics STP08IE120F4 ESBT NPN Emitter Switched Bipolar transistor, 1200V, 8A. Obsolete.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Series":"ESBT®","Package":"Tube","Applications":"Gate Driver","Mounting Type":"Through Hole","Package / Case":"TO-220-4 Full Pack","Product Status":"Obsolete","Transistor Type":"NPN - Emitter Switched Bipolar","Voltage - Rated":"1200V (1.2kV)","lifecycle_stage":"eol_hot","Base Product Number":"STP08I","Current Rating (Amps)":"8A","Supplier Device Package":"TO-220FP"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f79d1dd473ae3ef588333839db270931.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STP08IE120F4/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to STP08IE120F4?","answer":"No official pin-compatible successor is recorded from STMicroelectronics. The ESBT series has no direct drop-in replacement in the same TO-220-4 Full Pack package. A functional replacement requires evaluating the 1200 V / 8 A requirement against current IGBT or super-junction MOSFET families in a TO-247 or TO-220-3 package, which will need a board layout change."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STP08IE120F4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STP08IE120F4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T04:59:06.061Z","lastPublished":"2026-07-21T04:59:06.061Z","indexable":true}}