{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BC817K40E6359HTMA1","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"BC817K40E6359HTMA1","canonicalUrl":"https://icboms.com/infineon/BC817K40E6359HTMA1","factsUrl":"https://icboms.com/api/mcp/products/BC817K40E6359HTMA1","rawCanonicalId":null},"summary":{"shortDescription":"Infineon BC817K40E6359HTMA1, NPN transistor, 45 V Vce, 500 mA Ic, 250 min hFE, 170 MHz fT, SOT-23, AEC-Q101, Tape & Reel.","salesMarkdown":"## Last-time-buy — plan your final order now Infineon has marked the BC817K40E6359HTMA1 as Last Buy. That means the production window is closing — this is the time to secure lifetime buy quantities or qualify a drop-in replacement before the line goes dark. ## Automotive-grade NPN in a SOT-23 footprint It handles a collector current of 500 mA with a collector-emitter breakdown voltage of 45 V, making it a solid choice for general-purpose switching and driver circuits in engine control units, body electronics, and sensor interfaces where the under-hood temperature range demands a 150°C junction rating. The 170 MHz transition frequency keeps switching edges clean for PWM and low-speed logic-level translation. DC current gain is a minimum of 250 at 100 mA, 1 V — that high gain means you can drive the base with a modest microcontroller GPIO through a single resistor and still saturate the transistor hard. The 500 mA continuous collector current is the practical ceiling for this device in a SOT-23. The 500 mW power dissipation limit means you need to derate for ambient temperature — at 85°C ambient the available power drops to roughly 60% of the 500 mW maximum. For loads above 300 mA continuous, check the junction temperature against the 150°C rating. Vce(sat) is 700 mV maximum at 50 mA base current and 500 mA collector current. That saturation voltage is typical for a medium-power NPN in this package — budget for the drop when calculating the load voltage in a low-side switch configuration. The 100 nA maximum collector cutoff current is tight enough for most automotive loads; for high-impedance nodes like a wake-up input, that leakage is negligible.","metaTitle":"Infineon BC817K40E6359HTMA1 NPN Transistor, 45V 500mA SOT-23","metaDescription":"Infineon BC817K40E6359HTMA1 NPN transistor, 45V Vce, 500mA Ic, hFE 250 min, 170MHz fT. AEC-Q101 qualified.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Last Buy","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Infineon Technologies","Grade":"Automotive","Series":"-","Package":"Tape & Reel (TR)","Power - Max":"500 mW","Mounting Type":"Surface Mount","Qualification":"AEC-Q101","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":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/BC817K40E6359HTMA1/alternatives.json"},"ai":{"faq":[{"question":"Is BC817K40E6359HTMA1 qualified for automotive use (AEC-Q101)?","answer":"Yes, the BC817K40E6359HTMA1 carries AEC-Q101 qualification and an Automotive grade rating. It is suitable for use in automotive electronic systems that require the stress and reliability testing that AEC-Q101 certification covers."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/BC817K40E6359HTMA1","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/BC817K40E6359HTMA1 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T14:25:55.447Z","lastPublished":"2026-07-16T14:25:55.447Z","indexable":true}}