{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STP185N55F3","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STP185N55F3","canonicalUrl":"https://icboms.com/stmicroelectronics/STP185N55F3","factsUrl":"https://icboms.com/api/mcp/products/STP185N55F3","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STripFET™ STP185N55F3, N-Channel MOSFET, 55 V Vdss, 120 A Id, 3.8 mOhm Rds(on) @ 10 V, 100 nC Qg, TO-220-3, -55 to 175 °C.","salesMarkdown":"## Gate charge and switching — 100 nC at 10 V Total gate charge is 100 nC at 10 V. That is a moderate figure for a 120 A device — the driver must supply about 1 A of peak current to hit a 100 ns rise time. For a 100 kHz SMPS, budget around 10 mA average gate drive current; a standard totem-pole driver handles it without a heatsink. That extra headroom matters in downhole tools, avionics power stages, or any environment where the case temperature can push past 125°C. The 330 W power dissipation at case temperature assumes an infinite heatsink; real-world derating follows the RthJC of the TO-220 package — about 0.45 °C/W junction-to-case. ## Obsolete — sourcing through the independent channel ST has marked the STP185N55F3 as obsolete. Availability and pricing vary with market conditions; we source and quote each request to order against an RFQ, confirming current stock and price at quote time.","metaTitle":"STP185N55F3 N-Channel MOSFET, 55V 120A TO-220, 3.8mOhm","metaDescription":"STP185N55F3 N-channel MOSFET from ST's STripFET series: 55V Vdss, 120A Id, 3.8mOhm Rds(on) at 10V. TO-220 package.","metaKeywords":null},"attributes":{"series":"STripFET™","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Obsolete","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Series":"STripFET™","Package":"Tube","FET Type":"N-Channel","Vgs (Max)":"±20V","Technology":"MOSFET (Metal Oxide)","FET Feature":"-","Mounting Type":"Through Hole","Package / Case":"TO-220-3","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Vgs(th) (Max) @ Id":"4V @ 250µA","Base Product Number":"STP185","Operating Temperature":"-55°C~175°C(TJ)","Rds On (Max) @ Id, Vgs":"3.8mOhm @ 60A, 10V","Power Dissipation (Max)":"330W (Tc)","Supplier Device Package":"TO-220","Gate Charge (Qg) (Max) @ Vgs":"100 nC @ 10 V","Drain to Source Voltage (Vdss)":"55 V","Input Capacitance (Ciss) (Max) @ Vds":"6800 pF @ 25 V","Drive Voltage (Max Rds On, Min Rds On)":"10V","Current - Continuous Drain (Id) @ 25°C":"120A (Tc)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.3800","priceTiers":[{"qty":1,"price":"$5.38000","currency":"USD"},{"qty":10,"price":"$4.51600","currency":"USD"},{"qty":100,"price":"$3.65360","currency":"USD"},{"qty":500,"price":"$3.24768","currency":"USD"},{"qty":1000,"price":"$2.78082","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STP185N55F3/alternatives.json"},"ai":{"faq":[{"question":"Is STP185N55F3 obsolete and what is a direct replacement?","answer":"Yes, the STP185N55F3 is obsolete per ST's product status. No official direct replacement is listed by the manufacturer. For a pin-compatible alternative in the same TO-220 footprint, look for an N-channel MOSFET with similar 55 V Vdss, 120 A Id, and 3.8 mOhm Rds(on) ratings — several vendors offer parts in this performance tier. Confirm the gate charge and threshold voltage match your drive circuit before substituting."},{"question":"What is the Rds(on) and Vgs(th) of STP185N55F3?","answer":"Maximum Rds(on) is 3.8 mOhm at 60 A drain current with 10 V gate drive. Maximum gate threshold voltage is 4 V at 250 µA drain current. The recommended drive voltage for minimum on-resistance is 10 V."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STP185N55F3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STP185N55F3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T16:06:54.688Z","lastPublished":"2026-07-16T16:06:54.688Z","indexable":true}}