{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BC 817-40 B5003","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"BC-817-40-B5003","canonicalUrl":"https://icboms.com/infineon/BC-817-40-B5003","factsUrl":"https://icboms.com/api/mcp/products/BC%20817-40%20B5003","rawCanonicalId":null},"summary":{"shortDescription":"Infineon BC 817-40 B5003 NPN transistor, 45 V Vce breakdown, 500 mA collector current, 170 MHz transition frequency, SOT-23 package, 330 mW power dissipation.","salesMarkdown":"The Infineon BC 817-40 B5003 is an NPN bipolar junction transistor in a standard SOT-23 surface-mount package. It is designed for general-purpose switching and amplification in low-power circuits, with a collector-emitter breakdown voltage of 45 V and a continuous collector current rating of 500 mA. The 170 MHz transition frequency suits it for driver stages and signal conditioning up to the low-MHz range. The 45 V Vce breakdown gives enough headroom for 12 V and 24 V rails, but it is not a 60 V or 80 V part — do not use it where transients can exceed that ceiling. The 500 mA Ic rating covers moderate loads like relay coils, LED strings, and small solenoids, but it is not a power transistor; the 330 mW dissipation limit means derating is required above 25 °C ambient. The 170 MHz fT is adequate for switching regulators in the 100–500 kHz range and for audio preamp stages, but not for RF power applications. ## Lifecycle status — obsolete, no official successor The BC 817-40 B5003 is marked obsolete by the manufacturer. For new designs, consider a current-production NPN transistor in SOT-23 with similar ratings, such as the BC 817-25 or BC 817-16 variants (different hFE binning) or the BC 847 series, but verify pin compatibility and hFE range for your circuit. ## Package and mounting — SOT-23 footprint The BC 817-40 B5003 is supplied in a TO-236-3 / SC-59 / SOT-23-3 package, with the Infineon code PG-SOT23. It is a surface-mount device with three leads. The small footprint is standard for low-power discrete transistors and is compatible with most pick-and-place and reflow processes.","metaTitle":"BC 817-40 B5003 NPN Transistor, 45 V, 500 mA, SOT-23","metaDescription":"Infineon BC 817-40 B5003 NPN transistor, 45 V Vce, 500 mA Ic, 170 MHz fT, SOT-23 package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Infineon Technologies","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Power - Max":"330 mW","Mounting Type":"Surface Mount","Package / Case":"TO-236-3, SC-59, SOT-23-3","Product Status":"Obsolete","Transistor Type":"NPN","lifecycle_stage":"eol_hot","Base Product Number":"BC 817","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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/e1198b7a398bf9fcc31ab9c515acedbd.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the replacement for BC 817-40 B5003?","answer":"No official replacement order code is published by Infineon. Pin-compatible alternatives include other BC 817 gain-binned variants (e.g., BC 817-25 or BC 817-16) or the BC 847 series, but you must verify hFE range and any other circuit-specific parameters."},{"question":"Where can I buy BC 817-40 B5003?","answer":"Submit an RFQ to confirm current availability and pricing — stock is quoted to order, not held on a shelf."},{"question":"Is BC 817-40 the same as BC 847?","answer":"The BC 817 and BC 847 are both NPN transistors in SOT-23 packages, but they have different pinouts (BC 817: collector-base-emitter; BC 847: collector-emitter-base) and different hFE groupings. They are not direct drop-in replacements without board layout changes."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/BC-817-40-B5003","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/BC-817-40-B5003 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}}