{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BAT54WFILMY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"BAT54WFILMY","canonicalUrl":"https://icboms.com/stmicroelectronics/BAT54WFILMY","factsUrl":"https://icboms.com/api/mcp/products/BAT54WFILMY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics Q Automotive series, BAT54WFILMY, Schottky diode, 40 V reverse voltage, 300 mA average rectified current, 5 ns reverse recovery time, SOT-323 surface-mount package.","salesMarkdown":"The STMicroelectronics BAT54WFILMY is a Schottky barrier diode in the Q Automotive series, rated for a maximum DC reverse voltage of 40 V and an average rectified forward current of 300 mA. Its 5 ns reverse recovery time makes it suitable for fast-switching rectification, freewheeling, and polarity protection in automotive and industrial power rails where low forward voltage drop and minimal stored charge are required. ## Junction temperature range and automotive qualification The Q Automotive series designation indicates this device is qualified for automotive applications, supporting AEC-Q101 compliance (typical for ST's Q-series diodes). For a BOM that must survive thermal cycling and high ambient heat, this part keeps the margin on the rectifier stage. ## Package and footprint — SOT-323 Housed in a SOT-323 (SC-70) surface-mount package, the BAT54WFILMY occupies minimal board area — roughly 2.0 mm × 1.25 mm footprint. The small outline suits dense layouts in ECU modules, sensor interfaces, and compact power supplies. Standard SOT-323 land pattern applies; no special thermal pad is needed for the 300 mA average current. ## Reverse leakage and capacitance — signal-path considerations Reverse leakage is specified at 1 µA maximum at 30 V reverse voltage, which is low enough for battery-powered circuits where quiescent draw matters. Junction capacitance is 10 pF at 1 V, 1 MHz — this keeps the diode transparent in high-speed switching nodes up to several MHz, though for RF or fast digital lines you should verify the RC time constant against your edge rate. ## Forward voltage drop at rated current Forward voltage is 900 mV maximum at 100 mA forward current. This is typical for a small-signal Schottky — the drop is higher than a 1 A-rated Schottky but acceptable for the 300 mA average current rating. For low-voltage rails (3.3 V or below), the 900 mV drop at 100 mA represents about 27% of the rail, so consider a lower-Vf Schottky if your design runs from a 1.8 V supply. This is a current-production part available through independent distribution. For production BOMs, the active lifecycle means no forced redesign for obsolescence in the near term. The base product number BAT54 covers a family of single and dual Schottky diodes in various packages, so if you need a dual version or a different footprint, the family gives you options without requalifying the electrical characteristics.","metaTitle":"STMicroelectronics BAT54WFILMY Schottky Diode, 40V, 300mA","metaDescription":"Schottky diode rated 40V reverse voltage, 300mA average rectified current, 5ns trr. Q Automotive series, SOT-323 package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Speed":"Fast Recovery =< 500ns, > 200mA (Io)","Series":"Q Automotive","Package":"Tape & Reel (TR); Cut Tape (CT)","Diode Type":"Schottky","Mounting Type":"Surface Mount","Package / Case":"SC-70, SOT-323","Product Status":"Active","lifecycle_stage":"eol_hot","Base Product Number":"BAT54","Capacitance @ Vr, F":"10pF @ 1V, 1MHz","Supplier Device Package":"SOT-323","Reverse Recovery Time (trr)":"5 ns","Current - Reverse Leakage @ Vr":"1 µA @ 30 V","Voltage - DC Reverse (Vr) (Max)":"40 V","Current - Average Rectified (Io)":"300mA","Operating Temperature - Junction":"-40°C~150°C","Voltage - Forward (Vf) (Max) @ If":"900 mV @ 100 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5100","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/1b3bae8bb81057a6b6d2be488c605aa3.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/BAT54WFILMY/alternatives.json"},"ai":{"faq":[{"question":"Is BAT54WFILMY RoHS compliant?","answer":"Yes, the BAT54WFILMY is RoHS compliant. STMicroelectronics marks this part as RoHS-compliant in its product documentation."},{"question":"What is the closest pin-compatible alternative to BAT54WFILMY?","answer":"Within the BAT54 family, the BAT54WSFILMY is a pin-compatible SOT-323 variant with the same 40 V, 300 mA ratings and 5 ns trr. The difference is in the ordering code suffix; electrical characteristics are identical. For dual sourcing, you can also consider the BAT54 series from other manufacturers in SOT-323, but verify the forward voltage and leakage specs against your design margins."},{"question":"What is BAT54WFILMY's listed speed?","answer":"The listed speed category is Fast Recovery (≤ 500 ns, > 200 mA Io), and the actual reverse recovery time is 5 ns. This qualifies it for fast-switching applications like DC-DC converter freewheeling diodes and high-frequency rectification."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/BAT54WFILMY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/BAT54WFILMY 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}}