{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BC817K40WE6327","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"BC817K40WE6327","canonicalUrl":"https://icboms.com/infineon/BC817K40WE6327","factsUrl":"https://icboms.com/api/mcp/products/BC817K40WE6327","rawCanonicalId":null},"summary":{"shortDescription":"Infineon BC817K40WE6327 NPN transistor, Automotive AEC-Q101, 45 V Vce, 500 mA Ic, hFE 250 min at 100 mA, 170 MHz fT, SOT-323 package.","salesMarkdown":"## Automotive-grade NPN transistor in SOT-323 The Infineon BC817K40WE6327 is an NPN bipolar junction transistor qualified to AEC-Q101 for automotive applications. It is rated for a collector-emitter breakdown voltage of 45 V and a continuous collector current of 500 mA, with a power dissipation ceiling of 500 mW in the SOT-323 package. The minimum DC current gain (hFE) of 250 at 100 mA collector current and 1 V Vce makes this part suitable for medium-gain driver stages in automotive ECUs, relay drivers, and solenoid actuation circuits where the load current stays under 500 mA. With a transition frequency of 170 MHz, the BC817K40WE6327 can handle switching applications up to several megahertz, though the SOT-323 package limits thermal dissipation in continuous high-current operation. ## hFE bin and saturation voltage The '40' suffix in the order code denotes the hFE bin: a minimum gain of 250 at 100 mA, 1 V. This is the highest gain bin in the BC817 family, useful when base drive is limited or when the design needs to minimize input current from a microcontroller GPIO or sensor output. Maximum Vce saturation is 700 mV at 50 mA base current and 500 mA collector current. In a saturated switch application, the 700 mV drop at full load means the transistor dissipates about 350 mW at 500 mA — close to the package power limit, so derating for ambient temperature is necessary. ## Package and thermal considerations The BC817K40WE6327 is supplied in a PG-SOT323-3-1 package (SC-70 / SOT-323 footprint), a three-lead surface-mount package with a small 2.0 mm × 2.1 mm body. The 500 mW power rating assumes standard FR-4 board copper; for continuous operation near the maximum current, additional copper area on the collector pad or a lower ambient temperature is required. Junction temperature is rated to 150 °C, which allows operation in under-hood automotive environments when the board temperature stays below 125 °C and the power dissipation is derated accordingly.","metaTitle":"BC817K40WE6327 NPN Transistor, AEC-Q101, 45 V, 500 mA","metaDescription":"Infineon BC817K40WE6327 NPN transistor, AEC-Q101 qualified, 45 V Vce, 500 mA Ic, hFE 250 min at 100 mA, 170 MHz fT, SOT-323.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Infineon Technologies","Series":"Automotive, AEC-Q101","Package":"Bulk","Power - Max":"500 mW","Mounting Type":"Surface Mount","Package / Case":"SC-70, SOT-323","Product Status":"Active","lifecycle_stage":"eol_hot","Operating Temperature":"150°C(TJ)","Frequency - Transition":"170MHz","Supplier Device Package":"PG-SOT323-3-1","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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b4e378390df63bd31f55c7981ea55926.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the hFE of BC817K40WE6327?","answer":"This is the '40' gain bin, the highest in the BC817 family."},{"question":"Can I replace BC817-40 with BC817K40WE6327?","answer":"Yes, the BC817K40WE6327 is functionally equivalent to a standard BC817-40 NPN transistor, with the addition of AEC-Q101 automotive qualification. The electrical ratings — 45 V Vce, 500 mA Ic, hFE 250 min — are the same. The package is SOT-323, which is pin-compatible with other SOT-23 variants but has a smaller footprint, so verify the PCB land pattern before substitution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/BC817K40WE6327","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/BC817K40WE6327 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}}