{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BD139-10","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"BD139-10","canonicalUrl":"https://icboms.com/stmicroelectronics/BD139-10","factsUrl":"https://icboms.com/api/mcp/products/BD139-10","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics BD139-10, NPN transistor, 80 V Vce, 1.5 A Ic, 1.25 W, hFE 40 @ 150 mA, through-hole SOT-32 / TO-126 package.","salesMarkdown":"## 80 V, 1.5 A NPN — linear and switching duty The BD139-10 is an NPN epitaxial planar transistor rated for 80 V collector-emitter breakdown and 1.5 A continuous collector current. It is specified for general-purpose linear amplifier and low-to-medium speed switching applications where a through-hole package and moderate power dissipation are acceptable. Maximum power dissipation is 1.25 W, which sets the thermal budget for continuous operation in the TO-225AA / SOT-32 package. The junction temperature rating of 150 °C defines the safe operating area; derating is required above 25 °C ambient. ## Saturation voltage and DC gain — drive margin check Vce(sat) is specified at 500 mV maximum with 50 mA base current driving 500 mA collector current. This saturation voltage is the conduction loss floor in a low-side switch or linear regulator pass element. The gain at the operating point determines the base drive current required to keep the transistor in saturation; a lower hFE demands more base current from the driving stage. Collector cutoff current is 100 nA maximum (ICBO), which is low enough for most linear circuits but should be considered in high-impedance bias networks at elevated temperature. ## Through-hole SOT-32 — board integration The BD139-10 is supplied in a through-hole SOT-32 package (also designated TO-225AA or TO-126-3). The three-lead, tabbed package is designed for vertical mounting on a PCB or heatsink; the metal tab provides a low-thermal-resistance path to the ambient or a clip-on heatsink.","metaTitle":"BD139-10 NPN Transistor, 80 V, 1.5 A, 1.25 W, SOT-32","metaDescription":"BD139-10 NPN transistor: 80 V Vce, 1.5 A Ic, 1.25 W max, hFE 40 min at 150 mA. Active production, through-hole SOT-32.","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","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":"$0.4100","priceTiers":[{"qty":1,"price":"$0.41000","currency":"USD"},{"qty":10,"price":"$0.35200","currency":"USD"},{"qty":100,"price":"$0.24470","currency":"USD"},{"qty":500,"price":"$0.19108","currency":"USD"},{"qty":1000,"price":"$0.15532","currency":"USD"},{"qty":2000,"price":"$0.13885","currency":"USD"},{"qty":5000,"price":"$0.13178","currency":"USD"},{"qty":10000,"price":"$0.12237","currency":"USD"},{"qty":50000,"price":"$0.11650","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/2b4c847b4457cf87649f8f90311a78a9.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/BD139-10/alternatives.json"},"ai":{"faq":[{"question":"What is the maximum power dissipation of BD139-10?","answer":"The maximum power dissipation is 1.25 W, with a junction temperature rating of 150 °C. Derating is required above 25 °C ambient."},{"question":"Can I replace BD139 with BD139-10?","answer":"The BD139-10 is a specific hFE grade (bin 10) within the BD139 family. It is pin-compatible with other BD139 grades, but the DC current gain specification differs — verify the hFE requirement of your circuit before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/BD139-10","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/BD139-10 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}}