{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STD1805-1","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STD1805-1","canonicalUrl":"https://icboms.com/stmicroelectronics/STD1805-1","factsUrl":"https://icboms.com/api/mcp/products/STD1805-1","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STD1805-1 NPN bipolar junction transistor, 60 V Vceo, 5 A Ic, 150 MHz fT, 15 W Pd, TO-251-3 (I-PAK) through-hole package, Tube.","salesMarkdown":"## 60 V, 5 A NPN — what this transistor is for It is packaged in a TO-251-3 (I-PAK) through-hole case, shipped in Tube form. The 60 V Vceo gives you about 30% headroom on a 48 V bus after derating, but on a 60 V rail you are at the limit — reserve this part for 12 V and 24 V systems unless you are switching an inductive load with a good clamp. The 5 A Ic is a continuous rating; repetitive peak current can be higher, but the 15 W package limit is the real constraint in a TO-251. At 5 A and 600 mV Vce(sat) you dissipate 3 W in saturation alone, which at 25 °C ambient leaves about 12 W for switching losses — fine for a few hundred kHz, but above 1 MHz the 150 MHz fT starts to limit gain-bandwidth and you will see higher crossover loss. The DC current gain of 200 minimum at 100 mA means a microcontroller pin can drive this transistor directly through a 1 kΩ base resistor without needing a Darlington pair. ## Package and mounting note The TO-251-3 (I-PAK) is a through-hole package with short leads, designed for vertical mounting on a PCB. The tab is the collector. The I-PAK footprint is smaller than a standard TO-220 but shares the same 2.54 mm pin pitch, so it can be a drop-in replacement on boards laid out for TO-220 if the lead length and heatsinking are verified. No exposed pad — heat flows through the tab and the solder fillet on the collector pin.","metaTitle":"STD1805-1 NPN Transistor, 60 V, 5 A, 150 MHz, I-PAK","metaDescription":"STD1805-1 NPN bipolar transistor: 60 V Vceo, 5 A Ic, 150 MHz fT, 15 W Pd. TO-251 (I-PAK) through-hole.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Series":"-","Package":"Tube","Power - Max":"15 W","Mounting Type":"Through Hole","Package / Case":"TO-251-3 Short Leads, IPak, TO-251AA","Product Status":"Obsolete","Transistor Type":"NPN","lifecycle_stage":"eol_hot","Base Product Number":"STD18","Operating Temperature":"150°C(TJ)","Frequency - Transition":"150MHz","Supplier Device Package":"I-PAK","Vce Saturation (Max) @ Ib, Ic":"600mV @ 200mA, 5A","Current - Collector (Ic) (Max)":"5 A","Current - Collector Cutoff (Max)":"100nA (ICBO)","DC Current Gain (hFE) (Min) @ Ic, Vce":"200 @ 100mA, 2V","Voltage - Collector Emitter Breakdown (Max)":"60 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/03ce6fcb0b02a8a3cb1f99623554b85c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is STD1805-1 obsolete?","answer":"Yes, the STD1805-1 is listed as Obsolete. STMicroelectronics no longer manufactures this part."},{"question":"What is the replacement for STD1805-1?","answer":"The lifecycle record does not list an official STMicroelectronics successor order code for the STD1805-1. For a pin-compatible replacement, look for an NPN transistor in TO-251 (I-PAK) with a 60 V Vceo, 5 A Ic, and similar fT. Parts from the same ST bipolar family with the STD18 base number may share the same die in a different package variant, but no direct cross-reference is published. A buyer needing a drop-in should compare the pinout and tab connection of any candidate against the STD1805-1 datasheet."},{"question":"What are the specifications of STD1805-1?","answer":"The STD1805-1 is an NPN transistor with 60 V Vceo, 5 A Ic, 150 MHz transition frequency, 15 W power dissipation, 600 mV Vce(sat) at 5 A, and a minimum DC current gain of 200 at 100 mA."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STD1805-1","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STD1805-1 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}}