{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BD139-16","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"BD139-16","canonicalUrl":"https://icboms.com/stmicroelectronics/BD139-16","factsUrl":"https://icboms.com/api/mcp/products/BD139-16","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics BD139-16, NPN transistor, 80 V Vce, 1.5 A Ic, 1.25 W Pd, TO-225AA / SOT-32-3 through-hole package, 150°C junction temperature.","salesMarkdown":"## 80 V, 1.5 A NPN — medium-voltage driver staple The BD139-16 is an NPN epitaxial planar transistor in a TO-225AA (SOT-32-3) through-hole package, rated for 80 V collector-emitter breakdown and 1.5 A continuous collector current. The 1.25 W power dissipation ceiling in this package sets the thermal budget for linear regulator pass elements, relay drivers, and medium-speed switching up to a few hundred milliamps continuous. Minimum DC current gain of 40 at Ic=150 mA, Vce=2 V means the transistor needs at least 3.75 mA base drive to saturate at that collector current. The Vce(sat) max of 500 mV at 500 mA gives a conduction loss of 250 mW at that point — within the 1.25 W Pd budget but requiring a heatsink if continuous. The 100 nA collector cutoff current is low enough for battery-powered circuits that need the load fully off in the off-state.","metaTitle":"BD139-16 NPN Transistor, 80 V, 1.5 A, TO-225AA","metaDescription":"BD139-16 NPN transistor, 80 V Vce, 1.5 A Ic, 1.25 W Pd, TO-225AA through-hole package. Active production, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Series":"-","Package":"Tube","Power - Max":"1.25 W","Mounting Type":"Through Hole","Package / Case":"TO-225AA, TO-126-3","Product Status":"Active","Transistor Type":"NPN","lifecycle_stage":"eol_hot","Base Product Number":"BD139","Operating Temperature":"150°C (TJ)","Frequency - Transition":"-","Supplier Device Package":"SOT-32-3","Vce Saturation (Max) @ Ib, Ic":"500mV @ 50mA, 500mA","Current - Collector (Ic) (Max)":"1.5 A","Current - Collector Cutoff (Max)":"100nA (ICBO)","DC Current Gain (hFE) (Min) @ Ic, Vce":"40 @ 150mA, 2V","Voltage - Collector Emitter Breakdown (Max)":"80 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5100","priceTiers":[{"qty":1,"price":"$0.51000","currency":"USD"},{"qty":10,"price":"$0.39900","currency":"USD"},{"qty":100,"price":"$0.23920","currency":"USD"},{"qty":500,"price":"$0.22144","currency":"USD"},{"qty":1000,"price":"$0.15058","currency":"USD"},{"qty":2000,"price":"$0.13863","currency":"USD"},{"qty":5000,"price":"$0.13287","currency":"USD"},{"qty":10000,"price":"$0.11958","currency":"USD"},{"qty":50000,"price":"$0.11072","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/2b4c847b4457cf87649f8f90311a78a9.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/BD139-16/alternatives.json"},"ai":{"faq":[{"question":"What is the collector current of BD139-16?","answer":"The maximum continuous collector current (Ic) is 1.5 A. The DC current gain is specified at 150 mA, so the practical operating range for linear circuits is up to about 1 A with adequate heatsinking."},{"question":"Can I use BD139-16 instead of BD139?","answer":"The BD139-16 is a gain-group variant of the base BD139. The '16' suffix indicates a minimum hFE of 40 at 150 mA, which is the standard gain group for this series. It is a direct functional replacement for any BD139 in the same package, provided the gain group matches the circuit requirement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/BD139-16","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/BD139-16 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}