{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BUJ403A/DG,127","brand":"NXP Semiconductors","brandSlug":"nxp","productSlug":"BUJ403A-DG127","canonicalUrl":"https://icboms.com/nxp/BUJ403A-DG127","factsUrl":"https://icboms.com/api/mcp/products/BUJ403A%2FDG%2C127","rawCanonicalId":null},"summary":{"shortDescription":"NPN power bipolar transistor, 550 V collector-emitter breakdown, 6 A continuous collector current, 100 W max power dissipation, TO-220-3 through-hole package, 150°C junction temperature.","salesMarkdown":"## 550 V NPN for line-voltage switching The BUJ403A/DG,127 is an NPN power bipolar transistor in a TO-220-3 through-hole package, rated for 550 V collector-emitter breakdown and 6 A continuous collector current. With a maximum power dissipation of 100 W and a junction temperature rating of 150°C, it is suited for offline flyback converters, switch-mode power supply clamp circuits, and ballast inverters where a single high-voltage NPN handles the primary-side switching. ## Vce(sat) and conduction loss at 2 A Saturation voltage is specified at 1 V maximum with a 400 mA base drive and 2 A collector current. At that operating point the conduction loss is 2 W, which must be considered against the 100 W package limit and the thermal derating for a 150°C junction. The 20 minimum DC current gain at 500 mA, 5 V gives a reasonable base-drive efficiency for a power switch of this voltage class.","metaTitle":"BUJ403A/DG,127 NPN Power Transistor, 550 V, 6 A, TO-220-3","metaDescription":"BUJ403A/DG,127 NPN bipolar power transistor: 550 V Vceo, 6 A Ic, 100 W max, TO-220-3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Package":"Bulk","Power - Max":"100 W","Mounting Type":"Through Hole","Package / Case":"TO-220-3","Transistor Type":"NPN","lifecycle_stage":"eol_hot","Operating Temperature":"150°C (TJ)","Supplier Device Package":"TO-220AB","Vce Saturation (Max) @ Ib, Ic":"1V @ 400mA, 2A","Current - Collector (Ic) (Max)":"6 A","Current - Collector Cutoff (Max)":"100µA","DC Current Gain (hFE) (Min) @ Ic, Vce":"20 @ 500mA, 5V","Voltage - Collector Emitter Breakdown (Max)":"550 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4","stockQuantity":0,"priceTiers":[{"qty":760,"price":"$0.40000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/655dbca0f07ffa2287090aa20e873673.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to BUJ403A?","answer":"For a pin-compatible replacement, compare the TO-220-3 footprint and the 550 V / 6 A ratings against other NPN power transistors in the same package from the same manufacturer family."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/nxp/BUJ403A-DG127","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/nxp/BUJ403A-DG127 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}