{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BCR166","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"BCR166","canonicalUrl":"https://icboms.com/infineon/BCR166","factsUrl":"https://icboms.com/api/mcp/products/BCR166","rawCanonicalId":null},"summary":{"shortDescription":"Infineon BCR166, PNP - Pre-Biased, 50 V, 100 mA, 250 mW, 160 MHz, SC-70 SOT-323, Bulk.","salesMarkdown":"## Integrated resistor network saves board space The BCR166 is a PNP pre-biased transistor from Infineon in a SC-70 (SOT-323) surface-mount package. It integrates a 4.7 kΩ base resistor (R1) and a 47 kΩ emitter-base resistor (R2), eliminating two external passives per switching node. This is the part you reach for when you need to drive a low-side load from a microcontroller GPIO without adding resistor pairs to the BOM. ## Switching performance and saturation Collector-emitter breakdown is rated at 50 V, with a maximum continuous collector current of 100 mA and total power dissipation of 250 mW. The 160 MHz transition frequency supports switching into the low-MHz range. Vce saturation is specified at 300 mV maximum with 500 µA base drive and 10 mA collector current — a clean on-state voltage for a 5 V or 3.3 V logic interface. Collector cutoff leakage is held to 100 nA (ICBO), important for battery-powered circuits where off-state current bleeds the rail. ## DC gain and drive margin Minimum DC current gain (hFE) is 70 at 5 mA collector current and 5 V Vce. With the integrated 4.7 kΩ base resistor, a 3.3 V logic output delivering about 0.7 mA base current gives enough drive headroom to saturate the transistor at collector currents up to roughly 50 mA. The 47 kΩ emitter-base resistor ensures the transistor is held off when the GPIO is tri-stated or high-impedance. ## Package and marking verification The BCR166 is supplied in the PG-SOT323-3-1 package (SC-70 / SOT-323 footprint). The supplier device package code is PG-SOT323-3-1. When inspecting incoming material, confirm the top-side laser marking matches Infineon's standard for this date-code lot.","metaTitle":"BCR166 PNP Pre-Biased Transistor, SC-70, 50 V, 100 mA","metaDescription":"BCR166 PNP pre-biased transistor with integrated 4.7 kΩ base and 47 kΩ emitter resistors. 50 V VCEO, 100 mA Ic, 250 mW. SC-70 SOT-323 package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Infineon Technologies","Series":"-","Package":"Bulk","Power - Max":"250 mW","Mounting Type":"Surface Mount","Package / Case":"SC-70, SOT-323","Product Status":"Active","Transistor Type":"PNP - Pre-Biased","lifecycle_stage":"eol_hot","Resistor - Base (R1)":"4.7 kOhms","Frequency - Transition":"160 MHz","Supplier Device Package":"PG-SOT323-3-1","Resistor - Emitter Base (R2)":"47 kOhms","Vce Saturation (Max) @ Ib, Ic":"300mV @ 500µA, 10mA","Current - Collector (Ic) (Max)":"100 mA","Current - Collector Cutoff (Max)":"100nA (ICBO)","DC Current Gain (hFE) (Min) @ Ic, Vce":"70 @ 5mA, 5V","Voltage - Collector Emitter Breakdown (Max)":"50 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/ca565200a229b60fc4827216e2689e26.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the Vce saturation of BCR166?","answer":"Vce saturation is specified at 300 mV maximum at a base current of 500 µA and collector current of 10 mA."},{"question":"What is the closest pin-compatible alternative to BCR166?","answer":"Within Infineon's pre-biased transistor family, the BCR166 uses a 4.7 kΩ base resistor and 47 kΩ emitter-base resistor combination. A part with the same resistor values and package would be a direct functional equivalent; verify the specific internal resistor network matches your design's drive requirements before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/BCR166","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/BCR166 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}}