{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BC817K40E6433HTMA1","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"BC817K40E6433HTMA1","canonicalUrl":"https://icboms.com/infineon/BC817K40E6433HTMA1","factsUrl":"https://icboms.com/api/mcp/products/BC817K40E6433HTMA1","rawCanonicalId":null},"summary":{"shortDescription":"Infineon BC817K40E6433HTMA1 NPN transistor, 45 V V(BR)CEO, 500 mA Ic, 250 min hFE @ 100 mA / 1 V, 170 MHz fT, 500 mW Pd, PG-SOT23 package, 150°C junction temperature.","salesMarkdown":"## 45 V NPN in a PG-SOT23 — the general-purpose switch The Infineon BC817K40E6433HTMA1 is a 45 V, 500 mA NPN epitaxial silicon transistor in a PG-SOT23 surface-mount package. It is designed for general-purpose switching and amplification where the collector current stays under half an amp and the rail voltage does not exceed 45 V. The 170 MHz transition frequency keeps it useful for low-to-mid frequency switching up into the tens of megahertz. ## The 250 minimum hFE at 100 mA — where the gain lands The DC current gain is specified at 250 minimum when the collector sits at 100 mA and Vce is 1 V. That is the gain the designer budgets for base drive calculations — below this the transistor may not saturate properly. The 700 mV Vce(sat) maximum at 50 mA base / 500 mA collector gives the on-state voltage drop; at 500 mA load the transistor drops nearly three-quarters of a volt, so the power dissipation at full load runs about 350 mW, inside the 500 mW package limit. ## Last Buy — the sourcing window is closing Infineon has placed the BC817K40E6433HTMA1 in Last Buy status. That means the manufacturer is no longer accepting new orders for this specific ordering code after the final order date. If you have an active BOM line using this exact suffix, the window to secure lifetime-buy quantities is open now. Once the last-buy period closes, the only channel will be independent distribution for new-old-stock or surplus reels.","metaTitle":"Infineon BC817K40E6433HTMA1 NPN Transistor, 45 V, 500 mA","metaDescription":"Infineon BC817K40E6433HTMA1 NPN transistor: 45 V V(BR)CEO, 500 mA Ic, 250 min hFE at 100 mA, 170 MHz fT. PG-SOT23 package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Last Buy","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Infineon Technologies","Series":"-","Package":"Tape & Reel (TR) Cut Tape (CT)","Power - Max":"500 mW","Mounting Type":"Surface Mount","Package / Case":"TO-236-3, SC-59, SOT-23-3","Product Status":"Last Time Buy","Transistor Type":"NPN","lifecycle_stage":"eol_hot","Base Product Number":"BC817","Operating Temperature":"150°C (TJ)","Frequency - Transition":"170MHz","Supplier Device Package":"PG-SOT23","Vce Saturation (Max) @ Ib, Ic":"700mV @ 50mA, 500mA","Current - Collector (Ic) (Max)":"500 mA","Current - Collector Cutoff (Max)":"100nA (ICBO)","DC Current Gain (hFE) (Min) @ Ic, Vce":"250 @ 100mA, 1V","Voltage - Collector Emitter Breakdown (Max)":"45 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.3600","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/e1198b7a398bf9fcc31ab9c515acedbd.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/BC817K40E6433HTMA1/alternatives.json"},"ai":{"faq":[{"question":"What is the replacement for BC817K40E6433HTMA1?","answer":"The evidence does not list an official Infineon successor for this exact ordering code. The base product number is BC817, and other BC817 suffix variants (e.g., BC817-40) may be pin-compatible in the same SOT-23 footprint, but verify the hFE bin and package suffix against your design before substituting. For a drop-in alternative, check the broader BC817 family from Infineon or second-source NPN transistors with the same 45 V / 500 mA rating in SOT-23."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/BC817K40E6433HTMA1","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/BC817K40E6433HTMA1 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T14:58:47.406Z","lastPublished":"2026-07-16T14:58:47.406Z","indexable":true}}