{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BD680","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"BD680","canonicalUrl":"https://icboms.com/stmicroelectronics/BD680","factsUrl":"https://icboms.com/api/mcp/products/BD680","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics BD680 PNP Darlington transistor, 80 V Vce, 4 A Ic, 40 W max, SOT-32-3 (TO-225AA), Through Hole, Tube.","salesMarkdown":"## What the 80 V / 4 A rating means on the bench The BD680 is a PNP Darlington transistor rated for 80 V collector-emitter breakdown and 4 A continuous collector current, with a maximum power dissipation of 40 W. The Darlington pair inside gives it a DC current gain (hFE) of at least 750 at 1.5 A and 3 V — so a modest base drive of 30 mA can switch a 1.5 A load without the driver stage breaking a sweat. The Vce saturation is 2.5 V max at 30 mA base and 1.5 A collector current — that 2.5 V drop times the load current is the conduction loss you budget for in the heatsink calculation. At 1.5 A, that's 3.75 W of dissipation before you even add the base drive power. ## Package and board-fit — SOT-32-3 / TO-225AA Housed in a SOT-32-3 (also known as TO-225AA or TO-126-3) through-hole package, delivered in a tube. The three-lead layout is standard for medium-power Darlington transistors — the tab is the collector, and the metal back provides a direct thermal path to the heatsink or PCB copper pour. Operating junction temperature is rated to 150 °C, which is the ceiling for the silicon die itself — the case temperature at full 40 W dissipation will be lower, governed by the thermal resistance of the mounting interface.","metaTitle":"STMicroelectronics BD680 PNP Darlington, 80V 4A SOT-32-3","metaDescription":"STMicroelectronics BD680 PNP Darlington transistor, 80V Vce, 4A Ic, 40W max, SOT-32-3 (TO-225AA). Active production, ROHS3 compliant. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Tube","Power - Max":"40 W","Mounting Type":"Through Hole","Package / Case":"TO-225AA, TO-126-3","Transistor Type":"PNP - Darlington","lifecycle_stage":"eol_hot","Operating Temperature":"150°C (TJ)","Supplier Device Package":"SOT-32-3","Vce Saturation (Max) @ Ib, Ic":"2.5V @ 30mA, 1.5A","Current - Collector (Ic) (Max)":"4 A","Current - Collector Cutoff (Max)":"500µA","DC Current Gain (hFE) (Min) @ Ic, Vce":"750 @ 1.5A, 3V","Voltage - Collector Emitter Breakdown (Max)":"80 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.01","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.01000","currency":"USD"},{"qty":50,"price":"$0.81200","currency":"USD"},{"qty":100,"price":"$0.64350","currency":"USD"},{"qty":500,"price":"$0.54546","currency":"USD"},{"qty":1000,"price":"$0.44433","currency":"USD"},{"qty":2000,"price":"$0.41828","currency":"USD"},{"qty":5000,"price":"$0.39836","currency":"USD"},{"qty":10000,"price":"$0.37998","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/dc9e44f89bbea7ce0b4ca36a6231d5f4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy BD680 and how do I get a price?","answer":"The BD680 is sourced through independent distribution channels."},{"question":"Will BD680 drop into a board that was specified around BD681 without rewiring?","answer":"No — the BD680 is PNP, the BD681 is NPN. The pinout (base, collector, emitter) is the same order, but the polarity is reversed. The circuit would need to invert the drive signal and swap supply rails. For a PNP-to-PNP substitution, check the BDW94CFP, but that is a TO-220FP package — not a pin-compatible footprint."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/BD680","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/BD680 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}