{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STD901T","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STD901T","canonicalUrl":"https://icboms.com/stmicroelectronics/STD901T","factsUrl":"https://icboms.com/api/mcp/products/STD901T","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STD901T NPN Darlington transistor, 350 V Vce, 4 A Ic, 35 W max power, hFE 1800 min at 2 A, Vce(sat) 2 V at 2 A, DPAK (TO-252-3) package, surface mount.","salesMarkdown":"## 350 V, 4 A Darlington in DPAK — load-switching workhorse The STMicroelectronics STD901T is an NPN Darlington transistor rated for 350 V collector-emitter breakdown and 4 A continuous collector current, housed in a DPAK (TO-252-3) surface-mount package. The 35 W maximum power dissipation sets the thermal budget: at 2 A collector current with a 2 V saturation drop, the conduction loss is 4 W, leaving headroom for switching losses in a typical motor or solenoid drive at moderate frequency. Vce(sat) is specified at 2 V maximum with 20 mA base current and 2 A collector current — the Darlington configuration trades a higher saturation voltage for the very high gain. The 100 µA collector cutoff current at rated Vce is the leakage floor; at elevated junction temperature (150 °C max) it will rise, but stays within the typical Darlington range for this voltage class. ## Package and mounting — DPAK layout notes The DPAK (TO-252-3) has two leads plus a tab — the tab is the collector. ROHS3 compliant.","metaTitle":"STD901T NPN Darlington Transistor, 350 V 4 A DPAK","metaDescription":"STD901T NPN Darlington transistor, 350 V Vce, 4 A Ic, 35 W max power, hFE 1800 min at 2 A. Active production, ROHS3 compliant DPAK package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Series":"-","Package":"Tape & Reel (TR) Cut Tape (CT)","Power - Max":"35 W","Mounting Type":"Surface Mount","Package / Case":"TO-252-3, DPak (2 Leads + Tab), SC-63","Product Status":"Active","Transistor Type":"NPN - Darlington","lifecycle_stage":"eol_hot","Base Product Number":"STD901","Operating Temperature":"150°C (TJ)","Frequency - Transition":"-","Supplier Device Package":"DPAK","Vce Saturation (Max) @ Ib, Ic":"2V @ 20mA, 2A","Current - Collector (Ic) (Max)":"4 A","Current - Collector Cutoff (Max)":"100µA","DC Current Gain (hFE) (Min) @ Ic, Vce":"1800 @ 2A, 2V","Voltage - Collector Emitter Breakdown (Max)":"350 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.8000","priceTiers":[{"qty":1,"price":"$1.80000","currency":"USD"},{"qty":10,"price":"$1.49700","currency":"USD"},{"qty":100,"price":"$1.19150","currency":"USD"},{"qty":500,"price":"$1.00824","currency":"USD"},{"qty":1000,"price":"$0.85547","currency":"USD"},{"qty":2500,"price":"$0.81270","currency":"USD"},{"qty":5000,"price":"$0.78214","currency":"USD"},{"qty":12500,"price":"$0.75625","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/be0b9784135dc79b323a86efcaef0787.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STD901T/alternatives.json"},"ai":{"faq":[{"question":"What is the Vce saturation of STD901T?","answer":"Vce(sat) is 2 V maximum at 20 mA base current and 2 A collector current."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STD901T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STD901T 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}}